ARM/serial: at91: switch atmel serial to use gpiolib

This passes the errata fix using a GPIO to control the RTS pin on one of the AT91 chips to use gpiolib instead of the AT91-specific interfaces. Also remove the reliance on compile-time #defines and the cpu_* check and rely on the platform passing down the proper GPIO pin through platform data.

This is a prerequisite for getting rid of the local GPIO implementation in the AT91 platform and move toward multiplatform.

The patch also adds device tree support for getting the RTS GPIO pin from the device tree on DT boot paths.

Signed-off-by Nicolas Ferre <[email protected]>

Acked-by Jean-Christophe PLAGNIOL-VILLARD <[email protected]>

Signed-off-by Linus Walleij <[email protected]>

---
ChangeLog v3->v4:
- Assign RTS pin setup at runtime for the applicable platforms. Drive it to 1 rather than 0 by default as RTS is active low. Thanks to Jean-Christophe for noticing the fine details... sorry for the fuzz :-/
ChangeLog v2->v3:
- Instead of disallowing GPIO 0 to be used for the RTS signal to allow null-initialized platform data to mean "no RTS GPIO", be more generic and actually allow it, and patch every instance of atmel_uart_data to set .rts_gpio to -EINVAL except for the one case where we actually use pin 21 for RTS over GPIO.
ChangeLog v1->v2:
- Skip check for UART base address from leftover hack, if we have an RTS GPIO we just use it.
- Set default error value on GPIO pin to -EINVAL
- Fold in a device tree support patch from Nicolas Ferre

---
  .../devicetree/bindings/serial/atmel-usart.txt     |  3 ++
  arch/arm/mach-at91/at91rm9200_devices.c            | 10 ++++-
  arch/arm/mach-at91/at91sam9260_devices.c           |  7 ++++
  arch/arm/mach-at91/at91sam9261_devices.c           |  4 ++
  arch/arm/mach-at91/at91sam9263_devices.c           |  4 ++
  arch/arm/mach-at91/at91sam9g45_devices.c           |  5 +++
  arch/arm/mach-at91/at91sam9rl_devices.c            |  5 +++
  drivers/tty/serial/atmel_serial.c                  | 49 ++++++++++++++--------
  include/linux/platform_data/atmel.h                |  1 +
  9 files changed, 68 insertions(+), 20 deletions(-)

Documentation/devicetree/bindings/serial/atmel-usart.txt +3 -0

index 2191dcb9f1da..3adc61c2e4ca 100644
@@ -10,6 +10,8 @@ Required properties:
  Optional properties:
  - atmel,use-dma-rx: use of PDC or DMA for receiving data
  - atmel,use-dma-tx: use of PDC or DMA for transmitting data
+- rts-gpios: specify a GPIO for RTS line. It will use specified PIO instead of the peripheral
+  function pin for the USART RTS feature. If unsure, don't specify this property.
  - add dma bindings for dma transfer:
  	- dmas: DMA specifier, consisting of a phandle to DMA controller node,
  		memory peripheral interface and USART DMA channel ID, FIFO configuration.

@@ -28,6 +30,7 @@ Example:
  		interrupts = <7>;
  		atmel,use-dma-rx;
  		atmel,use-dma-tx;
+		rts-gpios = <&pioD 15 0>;
  	};
 
  - use DMA:

arch/arm/mach-at91/at91rm9200_devices.c +8 -2

index c721e9b08066..08ac5e2ff97d 100644
@@ -923,6 +923,7 @@ static struct resource dbgu_resources[] = {
  static struct atmel_uart_data dbgu_data = {
  	.use_dma_tx	= 0,
  	.use_dma_rx	= 0,		/* DBGU not capable of receive DMA */
+	.rts_gpio	= -EINVAL,
  };
 
  static u64 dbgu_dmamask = DMA_BIT_MASK(32);

@@ -961,6 +962,7 @@ static struct resource uart0_resources[] = {
  static struct atmel_uart_data uart0_data = {
  	.use_dma_tx	= 1,
  	.use_dma_rx	= 1,
+	.rts_gpio	= -EINVAL,
  };
 
  static u64 uart0_dmamask = DMA_BIT_MASK(32);

@@ -988,9 +990,10 @@ static inline void configure_usart0_pins(unsigned pins)
  	if (pins & ATMEL_UART_RTS) {
  		/*
  		 * AT91RM9200 Errata #39 - RTS0 is not internally connected to PA21.
-		 *  We need to drive the pin manually.  Default is off (RTS is active low).
+		 * We need to drive the pin manually. The serial driver will driver
+		 * this to high when initializing.
  		 */
-		at91_set_gpio_output(AT91_PIN_PA21, 1);
+		uart0_data.rts_gpio = AT91_PIN_PA21;
  	}
  }
 

@@ -1010,6 +1013,7 @@ static struct resource uart1_resources[] = {
  static struct atmel_uart_data uart1_data = {
  	.use_dma_tx	= 1,
  	.use_dma_rx	= 1,
+	.rts_gpio	= -EINVAL,
  };
 
  static u64 uart1_dmamask = DMA_BIT_MASK(32);

@@ -1061,6 +1065,7 @@ static struct resource uart2_resources[] = {
  static struct atmel_uart_data uart2_data = {
  	.use_dma_tx	= 1,
  	.use_dma_rx	= 1,
+	.rts_gpio	= -EINVAL,
  };
 
  static u64 uart2_dmamask = DMA_BIT_MASK(32);

@@ -1104,6 +1109,7 @@ static struct resource uart3_resources[] = {
  static struct atmel_uart_data uart3_data = {
  	.use_dma_tx	= 1,
  	.use_dma_rx	= 1,
+	.rts_gpio	= -EINVAL,
  };
 
  static u64 uart3_dmamask = DMA_BIT_MASK(32);

arch/arm/mach-at91/at91sam9260_devices.c +7 -0

index 428abfc14848..bcf4a161a3d8 100644
@@ -819,6 +819,7 @@ static struct resource dbgu_resources[] = {
  static struct atmel_uart_data dbgu_data = {
  	.use_dma_tx	= 0,
  	.use_dma_rx	= 0,		/* DBGU not capable of receive DMA */
+	.rts_gpio	= -EINVAL,
  };
 
  static u64 dbgu_dmamask = DMA_BIT_MASK(32);

@@ -857,6 +858,7 @@ static struct resource uart0_resources[] = {
  static struct atmel_uart_data uart0_data = {
  	.use_dma_tx	= 1,
  	.use_dma_rx	= 1,
+	.rts_gpio	= -EINVAL,
  };
 
  static u64 uart0_dmamask = DMA_BIT_MASK(32);

@@ -908,6 +910,7 @@ static struct resource uart1_resources[] = {
  static struct atmel_uart_data uart1_data = {
  	.use_dma_tx	= 1,
  	.use_dma_rx	= 1,
+	.rts_gpio	= -EINVAL,
  };
 
  static u64 uart1_dmamask = DMA_BIT_MASK(32);

@@ -951,6 +954,7 @@ static struct resource uart2_resources[] = {
  static struct atmel_uart_data uart2_data = {
  	.use_dma_tx	= 1,
  	.use_dma_rx	= 1,
+	.rts_gpio	= -EINVAL,
  };
 
  static u64 uart2_dmamask = DMA_BIT_MASK(32);

@@ -994,6 +998,7 @@ static struct resource uart3_resources[] = {
  static struct atmel_uart_data uart3_data = {
  	.use_dma_tx	= 1,
  	.use_dma_rx	= 1,
+	.rts_gpio	= -EINVAL,
  };
 
  static u64 uart3_dmamask = DMA_BIT_MASK(32);

@@ -1037,6 +1042,7 @@ static struct resource uart4_resources[] = {
  static struct atmel_uart_data uart4_data = {
  	.use_dma_tx	= 1,
  	.use_dma_rx	= 1,
+	.rts_gpio	= -EINVAL,
  };
 
  static u64 uart4_dmamask = DMA_BIT_MASK(32);

@@ -1075,6 +1081,7 @@ static struct resource uart5_resources[] = {
  static struct atmel_uart_data uart5_data = {
  	.use_dma_tx	= 1,
  	.use_dma_rx	= 1,
+	.rts_gpio	= -EINVAL,
  };
 
  static u64 uart5_dmamask = DMA_BIT_MASK(32);

arch/arm/mach-at91/at91sam9261_devices.c +4 -0

index 4e02e9271ac9..d5b08ef9e848 100644
@@ -880,6 +880,7 @@ static struct resource dbgu_resources[] = {
  static struct atmel_uart_data dbgu_data = {
  	.use_dma_tx	= 0,
  	.use_dma_rx	= 0,		/* DBGU not capable of receive DMA */
+	.rts_gpio	= -EINVAL,
  };
 
  static u64 dbgu_dmamask = DMA_BIT_MASK(32);

@@ -918,6 +919,7 @@ static struct resource uart0_resources[] = {
  static struct atmel_uart_data uart0_data = {
  	.use_dma_tx	= 1,
  	.use_dma_rx	= 1,
+	.rts_gpio	= -EINVAL,
  };
 
  static u64 uart0_dmamask = DMA_BIT_MASK(32);

@@ -961,6 +963,7 @@ static struct resource uart1_resources[] = {
  static struct atmel_uart_data uart1_data = {
  	.use_dma_tx	= 1,
  	.use_dma_rx	= 1,
+	.rts_gpio	= -EINVAL,
  };
 
  static u64 uart1_dmamask = DMA_BIT_MASK(32);

@@ -1004,6 +1007,7 @@ static struct resource uart2_resources[] = {
  static struct atmel_uart_data uart2_data = {
  	.use_dma_tx	= 1,
  	.use_dma_rx	= 1,
+	.rts_gpio	= -EINVAL,
  };
 
  static u64 uart2_dmamask = DMA_BIT_MASK(32);

arch/arm/mach-at91/at91sam9263_devices.c +4 -0

index 3a384ef27cf6..22b13c6226cb 100644
@@ -1325,6 +1325,7 @@ static struct resource dbgu_resources[] = {
  static struct atmel_uart_data dbgu_data = {
  	.use_dma_tx	= 0,
  	.use_dma_rx	= 0,		/* DBGU not capable of receive DMA */
+	.rts_gpio	= -EINVAL,
  };
 
  static u64 dbgu_dmamask = DMA_BIT_MASK(32);

@@ -1363,6 +1364,7 @@ static struct resource uart0_resources[] = {
  static struct atmel_uart_data uart0_data = {
  	.use_dma_tx	= 1,
  	.use_dma_rx	= 1,
+	.rts_gpio	= -EINVAL,
  };
 
  static u64 uart0_dmamask = DMA_BIT_MASK(32);

@@ -1406,6 +1408,7 @@ static struct resource uart1_resources[] = {
  static struct atmel_uart_data uart1_data = {
  	.use_dma_tx	= 1,
  	.use_dma_rx	= 1,
+	.rts_gpio	= -EINVAL,
  };
 
  static u64 uart1_dmamask = DMA_BIT_MASK(32);

@@ -1449,6 +1452,7 @@ static struct resource uart2_resources[] = {
  static struct atmel_uart_data uart2_data = {
  	.use_dma_tx	= 1,
  	.use_dma_rx	= 1,
+	.rts_gpio	= -EINVAL,
  };
 
  static u64 uart2_dmamask = DMA_BIT_MASK(32);

arch/arm/mach-at91/at91sam9g45_devices.c +5 -0

index 6b8effbffc28..89f95ed711c6 100644
@@ -1588,6 +1588,7 @@ static struct resource dbgu_resources[] = {
  static struct atmel_uart_data dbgu_data = {
  	.use_dma_tx	= 0,
  	.use_dma_rx	= 0,
+	.rts_gpio	= -EINVAL,
  };
 
  static u64 dbgu_dmamask = DMA_BIT_MASK(32);

@@ -1626,6 +1627,7 @@ static struct resource uart0_resources[] = {
  static struct atmel_uart_data uart0_data = {
  	.use_dma_tx	= 1,
  	.use_dma_rx	= 1,
+	.rts_gpio	= -EINVAL,
  };
 
  static u64 uart0_dmamask = DMA_BIT_MASK(32);

@@ -1669,6 +1671,7 @@ static struct resource uart1_resources[] = {
  static struct atmel_uart_data uart1_data = {
  	.use_dma_tx	= 1,
  	.use_dma_rx	= 1,
+	.rts_gpio	= -EINVAL,
  };
 
  static u64 uart1_dmamask = DMA_BIT_MASK(32);

@@ -1712,6 +1715,7 @@ static struct resource uart2_resources[] = {
  static struct atmel_uart_data uart2_data = {
  	.use_dma_tx	= 1,
  	.use_dma_rx	= 1,
+	.rts_gpio	= -EINVAL,
  };
 
  static u64 uart2_dmamask = DMA_BIT_MASK(32);

@@ -1755,6 +1759,7 @@ static struct resource uart3_resources[] = {
  static struct atmel_uart_data uart3_data = {
  	.use_dma_tx	= 1,
  	.use_dma_rx	= 1,
+	.rts_gpio	= -EINVAL,
  };
 
  static u64 uart3_dmamask = DMA_BIT_MASK(32);

arch/arm/mach-at91/at91sam9rl_devices.c +5 -0

index 6cf441cadf94..3c2462b15b8b 100644
@@ -957,6 +957,7 @@ static struct resource dbgu_resources[] = {
  static struct atmel_uart_data dbgu_data = {
  	.use_dma_tx	= 0,
  	.use_dma_rx	= 0,		/* DBGU not capable of receive DMA */
+	.rts_gpio	= -EINVAL,
  };
 
  static u64 dbgu_dmamask = DMA_BIT_MASK(32);

@@ -995,6 +996,7 @@ static struct resource uart0_resources[] = {
  static struct atmel_uart_data uart0_data = {
  	.use_dma_tx	= 1,
  	.use_dma_rx	= 1,
+	.rts_gpio	= -EINVAL,
  };
 
  static u64 uart0_dmamask = DMA_BIT_MASK(32);

@@ -1046,6 +1048,7 @@ static struct resource uart1_resources[] = {
  static struct atmel_uart_data uart1_data = {
  	.use_dma_tx	= 1,
  	.use_dma_rx	= 1,
+	.rts_gpio	= -EINVAL,
  };
 
  static u64 uart1_dmamask = DMA_BIT_MASK(32);

@@ -1089,6 +1092,7 @@ static struct resource uart2_resources[] = {
  static struct atmel_uart_data uart2_data = {
  	.use_dma_tx	= 1,
  	.use_dma_rx	= 1,
+	.rts_gpio	= -EINVAL,
  };
 
  static u64 uart2_dmamask = DMA_BIT_MASK(32);

@@ -1132,6 +1136,7 @@ static struct resource uart3_resources[] = {
  static struct atmel_uart_data uart3_data = {
  	.use_dma_tx	= 1,
  	.use_dma_rx	= 1,
+	.rts_gpio	= -EINVAL,
  };
 
  static u64 uart3_dmamask = DMA_BIT_MASK(32);

drivers/tty/serial/atmel_serial.c +31 -18

index d067285a2d20..af6765d3aedb 100644
@@ -35,21 +35,18 @@
  #include <linux/platform_device.h>
  #include <linux/of.h>
  #include <linux/of_device.h>
+#include <linux/of_gpio.h>
  #include <linux/dma-mapping.h>
  #include <linux/atmel_pdc.h>
  #include <linux/atmel_serial.h>
  #include <linux/uaccess.h>
  #include <linux/platform_data/atmel.h>
  #include <linux/timer.h>
+#include <linux/gpio.h>
 
  #include <asm/io.h>
  #include <asm/ioctls.h>
 
-#ifdef CONFIG_ARM
-#include <mach/cpu.h>
-#include <asm/gpio.h>
-#endif
-
  #define PDC_BUFFER_SIZE		512
  /* Revisit: We should calculate this based on the actual port settings */
  #define PDC_RX_TIMEOUT		(3 * 10)		/* 3 bytes */

@@ -167,6 +164,7 @@ struct atmel_uart_port {
  	struct circ_buf		rx_ring;
 
  	struct serial_rs485	rs485;		/* rs485 settings */
+	int			rts_gpio;	/* optional RTS GPIO */
  	unsigned int		tx_done_mask;
  	bool			is_usart;	/* usart or uart */
  	struct timer_list	uart_timer;	/* uart timer */

@@ -300,20 +298,16 @@ static void atmel_set_mctrl(struct uart_port *port, u_int mctrl)
  	unsigned int mode;
  	struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
 
-#ifdef CONFIG_ARCH_AT91RM9200
-	if (cpu_is_at91rm9200()) {
-		/*
-		 * AT91RM9200 Errata #39: RTS0 is not internally connected
-		 * to PA21. We need to drive the pin manually.
-		 */
-		if (port->mapbase == AT91RM9200_BASE_US0) {
-			if (mctrl & TIOCM_RTS)
-				at91_set_gpio_value(AT91_PIN_PA21, 0);
-			else
-				at91_set_gpio_value(AT91_PIN_PA21, 1);
-		}
+	/*
+	 * AT91RM9200 Errata #39: RTS0 is not internally connected
+	 * to PA21. We need to drive the pin as a GPIO.
+	 */
+	if (gpio_is_valid(atmel_port->rts_gpio)) {
+		if (mctrl & TIOCM_RTS)
+			gpio_set_value(atmel_port->rts_gpio, 0);
+		else
+			gpio_set_value(atmel_port->rts_gpio, 1);
  	}
-#endif
 
  	if (mctrl & TIOCM_RTS)
  		control |= ATMEL_US_RTSEN;

@@ -2365,6 +2359,25 @@ static int atmel_serial_probe(struct platform_device *pdev)
  	port = &atmel_ports[ret];
  	port->backup_imr = 0;
  	port->uart.line = ret;
+	port->rts_gpio = -EINVAL; /* Invalid, zero could be valid */
+	if (pdata)
+		port->rts_gpio = pdata->rts_gpio;
+	else if (np)
+		port->rts_gpio = of_get_named_gpio(np, "rts-gpios", 0);
+
+	if (gpio_is_valid(port->rts_gpio)) {
+		ret = devm_gpio_request(&pdev->dev, port->rts_gpio, "RTS");
+		if (ret) {
+			dev_err(&pdev->dev, "error requesting RTS GPIO\n");
+			goto err;
+		}
+		/* Default to 1 as RTS is active low */
+		ret = gpio_direction_output(port->rts_gpio, 1);
+		if (ret) {
+			dev_err(&pdev->dev, "error setting up RTS GPIO\n");
+			goto err;
+		}
+	}
 
  	ret = atmel_init_port(port, pdev);
  	if (ret)

include/linux/platform_data/atmel.h +1 -0

index cea9f70133c5..e26b0c14edea 100644
@@ -84,6 +84,7 @@ struct atmel_uart_data {
  	short			use_dma_rx;	/* use receive DMA? */
  	void __iomem		*regs;		/* virt. base address, if any */
  	struct serial_rs485	rs485;		/* rs485 settings */
+	int			rts_gpio;	/* optional RTS GPIO */
  };
 
   /* Touchscreen Controller */

On 07/11/2013 10:25, Linus Walleij :

Quoted 11 lines

This passes the errata fix using a GPIO to control the RTS pin on one of the AT91 chips to use gpiolib instead of the AT91-specific interfaces. Also remove the reliance on compile-time #defines and the cpu_* check and rely on the platform passing down the proper GPIO pin through platform data.

This is a prerequisite for getting rid of the local GPIO implementation in the AT91 platform and move toward multiplatform.

Quoted 6 lines

The patch also adds device tree support for getting the RTS GPIO pin from the device tree on DT boot paths.

Signed-off-by Nicolas Ferre <[email protected]>

Acked-by Jean-Christophe PLAGNIOL-VILLARD <[email protected]>

Signed-off-by Linus Walleij <[email protected]>

Hi Greg,

You acknowledged a previous version of this patch which was taking a different approach with the subject:
"[PATCH 1/4] ARM/serial: at91: move machine quirk into machine"

In order to integrate the series build by Linus in our AT91/arm-soc flow, would you mind reviewing this v4 patch and eventually giving your blessing ;-)
If it is okay on your side, I'll integrate it in a pull-request to arm-soc for 3.14.

Thanks, bye,

Quoted 433 lines

---
ChangeLog v3->v4:
- Assign RTS pin setup at runtime for the applicable platforms. Drive it to 1 rather than 0 by default as RTS is active low. Thanks to Jean-Christophe for noticing the fine details... sorry for the fuzz :-/
ChangeLog v2->v3:
- Instead of disallowing GPIO 0 to be used for the RTS signal to allow null-initialized platform data to mean "no RTS GPIO", be more generic and actually allow it, and patch every instance of atmel_uart_data to set .rts_gpio to -EINVAL except for the one case where we actually use pin 21 for RTS over GPIO.
ChangeLog v1->v2:
- Skip check for UART base address from leftover hack, if we have an RTS GPIO we just use it.
- Set default error value on GPIO pin to -EINVAL
- Fold in a device tree support patch from Nicolas Ferre

---
   .../devicetree/bindings/serial/atmel-usart.txt     |  3 ++
   arch/arm/mach-at91/at91rm9200_devices.c            | 10 ++++-
   arch/arm/mach-at91/at91sam9260_devices.c           |  7 ++++
   arch/arm/mach-at91/at91sam9261_devices.c           |  4 ++
   arch/arm/mach-at91/at91sam9263_devices.c           |  4 ++
   arch/arm/mach-at91/at91sam9g45_devices.c           |  5 +++
   arch/arm/mach-at91/at91sam9rl_devices.c            |  5 +++
   drivers/tty/serial/atmel_serial.c                  | 49 ++++++++++++++--------
   include/linux/platform_data/atmel.h                |  1 +
   9 files changed, 68 insertions(+), 20 deletions(-)

Documentation/devicetree/bindings/serial/atmel-usart.txt +3 -0

index 2191dcb9f1da..3adc61c2e4ca 100644
@@ -10,6 +10,8 @@ Required properties:
   Optional properties:
   - atmel,use-dma-rx: use of PDC or DMA for receiving data
   - atmel,use-dma-tx: use of PDC or DMA for transmitting data
+- rts-gpios: specify a GPIO for RTS line. It will use specified PIO instead of the peripheral
+  function pin for the USART RTS feature. If unsure, don't specify this property.
   - add dma bindings for dma transfer:
   	- dmas: DMA specifier, consisting of a phandle to DMA controller node,
   		memory peripheral interface and USART DMA channel ID, FIFO configuration.

@@ -28,6 +30,7 @@ Example:
   		interrupts = <7>;
   		atmel,use-dma-rx;
   		atmel,use-dma-tx;
+		rts-gpios = <&pioD 15 0>;
   	};
 
   - use DMA:

arch/arm/mach-at91/at91rm9200_devices.c +8 -2

index c721e9b08066..08ac5e2ff97d 100644
@@ -923,6 +923,7 @@ static struct resource dbgu_resources[] = {
   static struct atmel_uart_data dbgu_data = {
   	.use_dma_tx	= 0,
   	.use_dma_rx	= 0,		/* DBGU not capable of receive DMA */
+	.rts_gpio	= -EINVAL,
   };
 
   static u64 dbgu_dmamask = DMA_BIT_MASK(32);

@@ -961,6 +962,7 @@ static struct resource uart0_resources[] = {
   static struct atmel_uart_data uart0_data = {
   	.use_dma_tx	= 1,
   	.use_dma_rx	= 1,
+	.rts_gpio	= -EINVAL,
   };
 
   static u64 uart0_dmamask = DMA_BIT_MASK(32);

@@ -988,9 +990,10 @@ static inline void configure_usart0_pins(unsigned pins)
   	if (pins & ATMEL_UART_RTS) {
   		/*
   		 * AT91RM9200 Errata #39 - RTS0 is not internally connected to PA21.
-		 *  We need to drive the pin manually.  Default is off (RTS is active low).
+		 * We need to drive the pin manually. The serial driver will driver
+		 * this to high when initializing.
   		 */
-		at91_set_gpio_output(AT91_PIN_PA21, 1);
+		uart0_data.rts_gpio = AT91_PIN_PA21;
   	}
   }
 

@@ -1010,6 +1013,7 @@ static struct resource uart1_resources[] = {
   static struct atmel_uart_data uart1_data = {
   	.use_dma_tx	= 1,
   	.use_dma_rx	= 1,
+	.rts_gpio	= -EINVAL,
   };
 
   static u64 uart1_dmamask = DMA_BIT_MASK(32);

@@ -1061,6 +1065,7 @@ static struct resource uart2_resources[] = {
   static struct atmel_uart_data uart2_data = {
   	.use_dma_tx	= 1,
   	.use_dma_rx	= 1,
+	.rts_gpio	= -EINVAL,
   };
 
   static u64 uart2_dmamask = DMA_BIT_MASK(32);

@@ -1104,6 +1109,7 @@ static struct resource uart3_resources[] = {
   static struct atmel_uart_data uart3_data = {
   	.use_dma_tx	= 1,
   	.use_dma_rx	= 1,
+	.rts_gpio	= -EINVAL,
   };
 
   static u64 uart3_dmamask = DMA_BIT_MASK(32);

arch/arm/mach-at91/at91sam9260_devices.c +7 -0

index 428abfc14848..bcf4a161a3d8 100644
@@ -819,6 +819,7 @@ static struct resource dbgu_resources[] = {
   static struct atmel_uart_data dbgu_data = {
   	.use_dma_tx	= 0,
   	.use_dma_rx	= 0,		/* DBGU not capable of receive DMA */
+	.rts_gpio	= -EINVAL,
   };
 
   static u64 dbgu_dmamask = DMA_BIT_MASK(32);

@@ -857,6 +858,7 @@ static struct resource uart0_resources[] = {
   static struct atmel_uart_data uart0_data = {
   	.use_dma_tx	= 1,
   	.use_dma_rx	= 1,
+	.rts_gpio	= -EINVAL,
   };
 
   static u64 uart0_dmamask = DMA_BIT_MASK(32);

@@ -908,6 +910,7 @@ static struct resource uart1_resources[] = {
   static struct atmel_uart_data uart1_data = {
   	.use_dma_tx	= 1,
   	.use_dma_rx	= 1,
+	.rts_gpio	= -EINVAL,
   };
 
   static u64 uart1_dmamask = DMA_BIT_MASK(32);

@@ -951,6 +954,7 @@ static struct resource uart2_resources[] = {
   static struct atmel_uart_data uart2_data = {
   	.use_dma_tx	= 1,
   	.use_dma_rx	= 1,
+	.rts_gpio	= -EINVAL,
   };
 
   static u64 uart2_dmamask = DMA_BIT_MASK(32);

@@ -994,6 +998,7 @@ static struct resource uart3_resources[] = {
   static struct atmel_uart_data uart3_data = {
   	.use_dma_tx	= 1,
   	.use_dma_rx	= 1,
+	.rts_gpio	= -EINVAL,
   };
 
   static u64 uart3_dmamask = DMA_BIT_MASK(32);

@@ -1037,6 +1042,7 @@ static struct resource uart4_resources[] = {
   static struct atmel_uart_data uart4_data = {
   	.use_dma_tx	= 1,
   	.use_dma_rx	= 1,
+	.rts_gpio	= -EINVAL,
   };
 
   static u64 uart4_dmamask = DMA_BIT_MASK(32);

@@ -1075,6 +1081,7 @@ static struct resource uart5_resources[] = {
   static struct atmel_uart_data uart5_data = {
   	.use_dma_tx	= 1,
   	.use_dma_rx	= 1,
+	.rts_gpio	= -EINVAL,
   };
 
   static u64 uart5_dmamask = DMA_BIT_MASK(32);

arch/arm/mach-at91/at91sam9261_devices.c +4 -0

index 4e02e9271ac9..d5b08ef9e848 100644
@@ -880,6 +880,7 @@ static struct resource dbgu_resources[] = {
   static struct atmel_uart_data dbgu_data = {
   	.use_dma_tx	= 0,
   	.use_dma_rx	= 0,		/* DBGU not capable of receive DMA */
+	.rts_gpio	= -EINVAL,
   };
 
   static u64 dbgu_dmamask = DMA_BIT_MASK(32);

@@ -918,6 +919,7 @@ static struct resource uart0_resources[] = {
   static struct atmel_uart_data uart0_data = {
   	.use_dma_tx	= 1,
   	.use_dma_rx	= 1,
+	.rts_gpio	= -EINVAL,
   };
 
   static u64 uart0_dmamask = DMA_BIT_MASK(32);

@@ -961,6 +963,7 @@ static struct resource uart1_resources[] = {
   static struct atmel_uart_data uart1_data = {
   	.use_dma_tx	= 1,
   	.use_dma_rx	= 1,
+	.rts_gpio	= -EINVAL,
   };
 
   static u64 uart1_dmamask = DMA_BIT_MASK(32);

@@ -1004,6 +1007,7 @@ static struct resource uart2_resources[] = {
   static struct atmel_uart_data uart2_data = {
   	.use_dma_tx	= 1,
   	.use_dma_rx	= 1,
+	.rts_gpio	= -EINVAL,
   };
 
   static u64 uart2_dmamask = DMA_BIT_MASK(32);

arch/arm/mach-at91/at91sam9263_devices.c +4 -0

index 3a384ef27cf6..22b13c6226cb 100644
@@ -1325,6 +1325,7 @@ static struct resource dbgu_resources[] = {
   static struct atmel_uart_data dbgu_data = {
   	.use_dma_tx	= 0,
   	.use_dma_rx	= 0,		/* DBGU not capable of receive DMA */
+	.rts_gpio	= -EINVAL,
   };
 
   static u64 dbgu_dmamask = DMA_BIT_MASK(32);

@@ -1363,6 +1364,7 @@ static struct resource uart0_resources[] = {
   static struct atmel_uart_data uart0_data = {
   	.use_dma_tx	= 1,
   	.use_dma_rx	= 1,
+	.rts_gpio	= -EINVAL,
   };
 
   static u64 uart0_dmamask = DMA_BIT_MASK(32);

@@ -1406,6 +1408,7 @@ static struct resource uart1_resources[] = {
   static struct atmel_uart_data uart1_data = {
   	.use_dma_tx	= 1,
   	.use_dma_rx	= 1,
+	.rts_gpio	= -EINVAL,
   };
 
   static u64 uart1_dmamask = DMA_BIT_MASK(32);

@@ -1449,6 +1452,7 @@ static struct resource uart2_resources[] = {
   static struct atmel_uart_data uart2_data = {
   	.use_dma_tx	= 1,
   	.use_dma_rx	= 1,
+	.rts_gpio	= -EINVAL,
   };
 
   static u64 uart2_dmamask = DMA_BIT_MASK(32);

arch/arm/mach-at91/at91sam9g45_devices.c +5 -0

index 6b8effbffc28..89f95ed711c6 100644
@@ -1588,6 +1588,7 @@ static struct resource dbgu_resources[] = {
   static struct atmel_uart_data dbgu_data = {
   	.use_dma_tx	= 0,
   	.use_dma_rx	= 0,
+	.rts_gpio	= -EINVAL,
   };
 
   static u64 dbgu_dmamask = DMA_BIT_MASK(32);

@@ -1626,6 +1627,7 @@ static struct resource uart0_resources[] = {
   static struct atmel_uart_data uart0_data = {
   	.use_dma_tx	= 1,
   	.use_dma_rx	= 1,
+	.rts_gpio	= -EINVAL,
   };
 
   static u64 uart0_dmamask = DMA_BIT_MASK(32);

@@ -1669,6 +1671,7 @@ static struct resource uart1_resources[] = {
   static struct atmel_uart_data uart1_data = {
   	.use_dma_tx	= 1,
   	.use_dma_rx	= 1,
+	.rts_gpio	= -EINVAL,
   };
 
   static u64 uart1_dmamask = DMA_BIT_MASK(32);

@@ -1712,6 +1715,7 @@ static struct resource uart2_resources[] = {
   static struct atmel_uart_data uart2_data = {
   	.use_dma_tx	= 1,
   	.use_dma_rx	= 1,
+	.rts_gpio	= -EINVAL,
   };
 
   static u64 uart2_dmamask = DMA_BIT_MASK(32);

@@ -1755,6 +1759,7 @@ static struct resource uart3_resources[] = {
   static struct atmel_uart_data uart3_data = {
   	.use_dma_tx	= 1,
   	.use_dma_rx	= 1,
+	.rts_gpio	= -EINVAL,
   };
 
   static u64 uart3_dmamask = DMA_BIT_MASK(32);

arch/arm/mach-at91/at91sam9rl_devices.c +5 -0

index 6cf441cadf94..3c2462b15b8b 100644
@@ -957,6 +957,7 @@ static struct resource dbgu_resources[] = {
   static struct atmel_uart_data dbgu_data = {
   	.use_dma_tx	= 0,
   	.use_dma_rx	= 0,		/* DBGU not capable of receive DMA */
+	.rts_gpio	= -EINVAL,
   };
 
   static u64 dbgu_dmamask = DMA_BIT_MASK(32);

@@ -995,6 +996,7 @@ static struct resource uart0_resources[] = {
   static struct atmel_uart_data uart0_data = {
   	.use_dma_tx	= 1,
   	.use_dma_rx	= 1,
+	.rts_gpio	= -EINVAL,
   };
 
   static u64 uart0_dmamask = DMA_BIT_MASK(32);

@@ -1046,6 +1048,7 @@ static struct resource uart1_resources[] = {
   static struct atmel_uart_data uart1_data = {
   	.use_dma_tx	= 1,
   	.use_dma_rx	= 1,
+	.rts_gpio	= -EINVAL,
   };
 
   static u64 uart1_dmamask = DMA_BIT_MASK(32);

@@ -1089,6 +1092,7 @@ static struct resource uart2_resources[] = {
   static struct atmel_uart_data uart2_data = {
   	.use_dma_tx	= 1,
   	.use_dma_rx	= 1,
+	.rts_gpio	= -EINVAL,
   };
 
   static u64 uart2_dmamask = DMA_BIT_MASK(32);

@@ -1132,6 +1136,7 @@ static struct resource uart3_resources[] = {
   static struct atmel_uart_data uart3_data = {
   	.use_dma_tx	= 1,
   	.use_dma_rx	= 1,
+	.rts_gpio	= -EINVAL,
   };
 
   static u64 uart3_dmamask = DMA_BIT_MASK(32);

drivers/tty/serial/atmel_serial.c +31 -18

index d067285a2d20..af6765d3aedb 100644
@@ -35,21 +35,18 @@
   #include <linux/platform_device.h>
   #include <linux/of.h>
   #include <linux/of_device.h>
+#include <linux/of_gpio.h>
   #include <linux/dma-mapping.h>
   #include <linux/atmel_pdc.h>
   #include <linux/atmel_serial.h>
   #include <linux/uaccess.h>
   #include <linux/platform_data/atmel.h>
   #include <linux/timer.h>
+#include <linux/gpio.h>
 
   #include <asm/io.h>
   #include <asm/ioctls.h>
 
-#ifdef CONFIG_ARM
-#include <mach/cpu.h>
-#include <asm/gpio.h>
-#endif
-
   #define PDC_BUFFER_SIZE		512
   /* Revisit: We should calculate this based on the actual port settings */
   #define PDC_RX_TIMEOUT		(3 * 10)		/* 3 bytes */

@@ -167,6 +164,7 @@ struct atmel_uart_port {
   	struct circ_buf		rx_ring;
 
   	struct serial_rs485	rs485;		/* rs485 settings */
+	int			rts_gpio;	/* optional RTS GPIO */
   	unsigned int		tx_done_mask;
   	bool			is_usart;	/* usart or uart */
   	struct timer_list	uart_timer;	/* uart timer */

@@ -300,20 +298,16 @@ static void atmel_set_mctrl(struct uart_port *port, u_int mctrl)
   	unsigned int mode;
   	struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
 
-#ifdef CONFIG_ARCH_AT91RM9200
-	if (cpu_is_at91rm9200()) {
-		/*
-		 * AT91RM9200 Errata #39: RTS0 is not internally connected
-		 * to PA21. We need to drive the pin manually.
-		 */
-		if (port->mapbase == AT91RM9200_BASE_US0) {
-			if (mctrl & TIOCM_RTS)
-				at91_set_gpio_value(AT91_PIN_PA21, 0);
-			else
-				at91_set_gpio_value(AT91_PIN_PA21, 1);
-		}
+	/*
+	 * AT91RM9200 Errata #39: RTS0 is not internally connected
+	 * to PA21. We need to drive the pin as a GPIO.
+	 */
+	if (gpio_is_valid(atmel_port->rts_gpio)) {
+		if (mctrl & TIOCM_RTS)
+			gpio_set_value(atmel_port->rts_gpio, 0);
+		else
+			gpio_set_value(atmel_port->rts_gpio, 1);
   	}
-#endif
 
   	if (mctrl & TIOCM_RTS)
   		control |= ATMEL_US_RTSEN;

@@ -2365,6 +2359,25 @@ static int atmel_serial_probe(struct platform_device *pdev)
   	port = &atmel_ports[ret];
   	port->backup_imr = 0;
   	port->uart.line = ret;
+	port->rts_gpio = -EINVAL; /* Invalid, zero could be valid */
+	if (pdata)
+		port->rts_gpio = pdata->rts_gpio;
+	else if (np)
+		port->rts_gpio = of_get_named_gpio(np, "rts-gpios", 0);
+
+	if (gpio_is_valid(port->rts_gpio)) {
+		ret = devm_gpio_request(&pdev->dev, port->rts_gpio, "RTS");
+		if (ret) {
+			dev_err(&pdev->dev, "error requesting RTS GPIO\n");
+			goto err;
+		}
+		/* Default to 1 as RTS is active low */
+		ret = gpio_direction_output(port->rts_gpio, 1);
+		if (ret) {
+			dev_err(&pdev->dev, "error setting up RTS GPIO\n");
+			goto err;
+		}
+	}
 
   	ret = atmel_init_port(port, pdev);
   	if (ret)

include/linux/platform_data/atmel.h +1 -0

index cea9f70133c5..e26b0c14edea 100644
@@ -84,6 +84,7 @@ struct atmel_uart_data {
   	short			use_dma_rx;	/* use receive DMA? */
   	void __iomem		*regs;		/* virt. base address, if any */
   	struct serial_rs485	rs485;		/* rs485 settings */
+	int			rts_gpio;	/* optional RTS GPIO */
   };
 
    /* Touchscreen Controller */

On 13/11/2013 17:28, Nicolas Ferre :

Quoted 25 lines

On 07/11/2013 10:25, Linus Walleij :

Quoted 11 lines

This passes the errata fix using a GPIO to control the RTS pin on one of the AT91 chips to use gpiolib instead of the AT91-specific interfaces. Also remove the reliance on compile-time #defines and the cpu_* check and rely on the platform passing down the proper GPIO pin through platform data.

This is a prerequisite for getting rid of the local GPIO implementation in the AT91 platform and move toward multiplatform.

Quoted 6 lines

The patch also adds device tree support for getting the RTS GPIO pin from the device tree on DT boot paths.

Signed-off-by Nicolas Ferre <[email protected]>

Acked-by Jean-Christophe PLAGNIOL-VILLARD <[email protected]>

Signed-off-by Linus Walleij <[email protected]>

Hi Greg,

You acknowledged a previous version of this patch which was taking a different approach with the subject:
"[PATCH 1/4] ARM/serial: at91: move machine quirk into machine"

Quoted 5 lines

In order to integrate the series build by Linus in our AT91/arm-soc flow, would you mind reviewing this v4 patch and eventually giving your blessing ;-)
If it is okay on your side, I'll integrate it in a pull-request to arm-soc for 3.14.

Greg, ping?

Hello Greg, hi Nicolas,

Quoted 26 lines · Nicolas Ferre

On 13/11/2013 17:28, Nicolas Ferre :

Quoted 25 lines

On 07/11/2013 10:25, Linus Walleij :

Quoted 11 lines

This passes the errata fix using a GPIO to control the RTS pin on one of the AT91 chips to use gpiolib instead of the AT91-specific interfaces. Also remove the reliance on compile-time #defines and the cpu_* check and rely on the platform passing down the proper GPIO pin through platform data.

This is a prerequisite for getting rid of the local GPIO implementation in the AT91 platform and move toward multiplatform.

Quoted 6 lines

The patch also adds device tree support for getting the RTS GPIO pin from the device tree on DT boot paths.

Signed-off-by Nicolas Ferre <[email protected]>

Acked-by Jean-Christophe PLAGNIOL-VILLARD <[email protected]>

Signed-off-by Linus Walleij <[email protected]>

Hi Greg,

You acknowledged a previous version of this patch which was taking a different approach with the subject:
"[PATCH 1/4] ARM/serial: at91: move machine quirk into machine"

Quoted 7 lines

Quoted 5 lines

In order to integrate the series build by Linus in our AT91/arm-soc flow, would you mind reviewing this v4 patch and eventually giving your blessing ;-)
If it is okay on your side, I'll integrate it in a pull-request to arm-soc for 3.14.

Greg, ping?

I'm depending on that patch for a series that gets rid of ARM's <mach/timex.h>. So I'm interested to either get a stable commit to base on or alternatively to get the blessing from both of you to take it (also via arm-soc) as part of my series.

A preview of my series is available at

git://git.pengutronix.de/git/ukl/linux.git deprecatemachtimexh

Quoted 41 lines · Uwe Kleine-K?nig

Hello Greg, hi Nicolas,

Quoted 26 lines · Nicolas Ferre

On 13/11/2013 17:28, Nicolas Ferre :

Quoted 25 lines

On 07/11/2013 10:25, Linus Walleij :

Quoted 11 lines

This passes the errata fix using a GPIO to control the RTS pin on one of the AT91 chips to use gpiolib instead of the AT91-specific interfaces. Also remove the reliance on compile-time #defines and the cpu_* check and rely on the platform passing down the proper GPIO pin through platform data.

This is a prerequisite for getting rid of the local GPIO implementation in the AT91 platform and move toward multiplatform.

Quoted 6 lines

The patch also adds device tree support for getting the RTS GPIO pin from the device tree on DT boot paths.

Signed-off-by Nicolas Ferre <[email protected]>

Acked-by Jean-Christophe PLAGNIOL-VILLARD <[email protected]>

Signed-off-by Linus Walleij <[email protected]>

Hi Greg,

You acknowledged a previous version of this patch which was taking a different approach with the subject:
"[PATCH 1/4] ARM/serial: at91: move machine quirk into machine"

Quoted 7 lines

Quoted 5 lines

In order to integrate the series build by Linus in our AT91/arm-soc flow, would you mind reviewing this v4 patch and eventually giving your blessing ;-)
If it is okay on your side, I'll integrate it in a pull-request to arm-soc for 3.14.

Greg, ping?

I'm depending on that patch for a series that gets rid of ARM's <mach/timex.h>. So I'm interested to either get a stable commit to base on or alternatively to get the blessing from both of you to take it (also via arm-soc) as part of my series.

Quoted 3 lines

A preview of my series is available at

git://git.pengutronix.de/git/ukl/linux.git deprecatemachtimexh

No objection from me to take it through your tree.

Hello Greg,

Quoted 42 lines · Greg Kroah-Hartman

Quoted 41 lines · Uwe Kleine-K?nig

Hello Greg, hi Nicolas,

Quoted 26 lines · Nicolas Ferre

On 13/11/2013 17:28, Nicolas Ferre :

Quoted 25 lines

On 07/11/2013 10:25, Linus Walleij :

Quoted 11 lines

This passes the errata fix using a GPIO to control the RTS pin on one of the AT91 chips to use gpiolib instead of the AT91-specific interfaces. Also remove the reliance on compile-time #defines and the cpu_* check and rely on the platform passing down the proper GPIO pin through platform data.

This is a prerequisite for getting rid of the local GPIO implementation in the AT91 platform and move toward multiplatform.

Quoted 6 lines

The patch also adds device tree support for getting the RTS GPIO pin from the device tree on DT boot paths.

Signed-off-by Nicolas Ferre <[email protected]>

Acked-by Jean-Christophe PLAGNIOL-VILLARD <[email protected]>

Signed-off-by Linus Walleij <[email protected]>

Hi Greg,

You acknowledged a previous version of this patch which was taking a different approach with the subject:
"[PATCH 1/4] ARM/serial: at91: move machine quirk into machine"

Quoted 7 lines

Quoted 5 lines

In order to integrate the series build by Linus in our AT91/arm-soc flow, would you mind reviewing this v4 patch and eventually giving your blessing ;-)
If it is okay on your side, I'll integrate it in a pull-request to arm-soc for 3.14.

Greg, ping?

I'm depending on that patch for a series that gets rid of ARM's <mach/timex.h>. So I'm interested to either get a stable commit to base on or alternatively to get the blessing from both of you to take it (also via arm-soc) as part of my series.

Quoted 5 lines

Quoted 3 lines

A preview of my series is available at

git://git.pengutronix.de/git/ukl/linux.git deprecatemachtimexh

No objection from me to take it through your tree.

gregkh: Thanks. I'll interpret this as Acked-by: you if Nicolas also agrees that I take it.

Hello Greg,

Quoted 44 lines · Greg Kroah-Hartman

Quoted 43 lines · Uwe Kleine-K?nig

Hello Greg, hi Nicolas,

Quoted 26 lines · Nicolas Ferre

On 13/11/2013 17:28, Nicolas Ferre :

Quoted 25 lines

On 07/11/2013 10:25, Linus Walleij :

Quoted 11 lines

This passes the errata fix using a GPIO to control the RTS pin on one of the AT91 chips to use gpiolib instead of the AT91-specific interfaces. Also remove the reliance on compile-time #defines and the cpu_* check and rely on the platform passing down the proper GPIO pin through platform data.

This is a prerequisite for getting rid of the local GPIO implementation in the AT91 platform and move toward multiplatform.

Quoted 6 lines

The patch also adds device tree support for getting the RTS GPIO pin from the device tree on DT boot paths.

Signed-off-by Nicolas Ferre <[email protected]>

Acked-by Jean-Christophe PLAGNIOL-VILLARD <[email protected]>

Signed-off-by Linus Walleij <[email protected]>

Hi Greg,

You acknowledged a previous version of this patch which was taking a different approach with the subject:
"[PATCH 1/4] ARM/serial: at91: move machine quirk into machine"

Quoted 7 lines

Quoted 5 lines

In order to integrate the series build by Linus in our AT91/arm-soc flow, would you mind reviewing this v4 patch and eventually giving your blessing ;-)
If it is okay on your side, I'll integrate it in a pull-request to arm-soc for 3.14.

Greg, ping?

I'm depending on that patch for a series that gets rid of ARM's <mach/timex.h>. So I'm interested to either get a stable commit to base on or alternatively to get the blessing from both of you to take it (also via arm-soc) as part of my series.

A preview of my series is available at

Quoted 3 lines

Quoted 1 line

git://git.pengutronix.de/git/ukl/linux.git deprecatemachtimexh

No objection from me to take it through your tree.

gregkh: Thanks. I'll interpret this as Acked-by: you if Nicolas also agrees that I take it.

nferre: What is your plan with this patch? Do you have patches depending on it, too, or is it ok if I take it?

On 04/12/2013 20:16, Uwe Kleine-K?nig :

Quoted 24 lines · Greg Kroah-Hartman

Quoted 23 lines · Uwe Kleine-K?nig

Quoted 22 lines

Hello Greg, hi Nicolas,

Quoted 19 lines · Nicolas Ferre

On 13/11/2013 17:28, Nicolas Ferre :

Quoted 18 lines

On 07/11/2013 10:25, Linus Walleij :

Quoted 17 lines

This passes the errata fix using a GPIO to control the RTS pin on one of the AT91 chips to use gpiolib instead of the AT91-specific interfaces. Also remove the reliance on compile-time #defines and the cpu_* check and rely on the platform passing down the proper GPIO pin through platform data.

This is a prerequisite for getting rid of the local GPIO implementation in the AT91 platform and move toward multiplatform.

The patch also adds device tree support for getting the RTS GPIO pin from the device tree on DT boot paths.

Signed-off-by Nicolas Ferre <[email protected]>

Acked-by Jean-Christophe PLAGNIOL-VILLARD <[email protected]>

Signed-off-by Linus Walleij <[email protected]>

[...]

Quoted 2 lines

nferre: What is your plan with this patch? Do you have patches depending on it, too, or is it ok if I take it?

Well, the problem is that your branch generates conflicts with the at91/cleanup one that Olof have just pulled. They are not big conflicts, only additions of header files at the same location. Maybe you can rebase your branch on top of this cleanup branch (arm-soc/next/cleanup: 94c5216ee93b3b4).

But, anyway I feel that it is better if you take the whole series in a raw.

Hello Nicolas,

Quoted 26 lines · Nicolas Ferre

On 04/12/2013 20:16, Uwe Kleine-K?nig :

Quoted 24 lines · Greg Kroah-Hartman

Quoted 23 lines · Uwe Kleine-K?nig

Quoted 22 lines

Hello Greg, hi Nicolas,

Quoted 19 lines · Nicolas Ferre

On 13/11/2013 17:28, Nicolas Ferre :

Quoted 18 lines

On 07/11/2013 10:25, Linus Walleij :

Quoted 17 lines

This passes the errata fix using a GPIO to control the RTS pin on one of the AT91 chips to use gpiolib instead of the AT91-specific interfaces. Also remove the reliance on compile-time #defines and the cpu_* check and rely on the platform passing down the proper GPIO pin through platform data.

This is a prerequisite for getting rid of the local GPIO implementation in the AT91 platform and move toward multiplatform.

The patch also adds device tree support for getting the RTS GPIO pin from the device tree on DT boot paths.

Signed-off-by Nicolas Ferre <[email protected]>

Acked-by Jean-Christophe PLAGNIOL-VILLARD <[email protected]>

Signed-off-by Linus Walleij <[email protected]>

[...]

Quoted 8 lines

Quoted 2 lines

nferre: What is your plan with this patch? Do you have patches depending on it, too, or is it ok if I take it?

Well, the problem is that your branch generates conflicts with the at91/cleanup one that Olof have just pulled. They are not big conflicts, only additions of header files at the same location. Maybe you can rebase your branch on top of this cleanup branch (arm-soc/next/cleanup: 94c5216ee93b3b4).

Olof said on irc: "that's easy to fix, i'm ok with resolving that when i merge". That is what I prefer because I don't want to retest everything after rebasing.

Quoted 2 lines

But, anyway I feel that it is better if you take the whole series in a raw.

So I can interpret this as your blessing to keep the patch in my series based on 3.13-rc1?

This passes the errata fix using a GPIO to control the RTS pin on one of the AT91 chips to use gpiolib instead of the AT91-specific interfaces. Also remove the reliance on compile-time #defines and the cpu_* check and rely on the platform passing down the proper GPIO pin through platform data.

This is a prerequisite for getting rid of the local GPIO implementation in the AT91 platform and move toward multiplatform.

The patch also adds device tree support for getting the RTS GPIO pin from the device tree on DT boot paths.

Signed-off-by Nicolas Ferre <[email protected]>

Acked-by Jean-Christophe PLAGNIOL-VILLARD <[email protected]>

Signed-off-by Linus Walleij <[email protected]>

This passes the errata fix using a GPIO to control the RTS pin on one of the AT91 chips to use gpiolib instead of the AT91-specific interfaces. Also remove the reliance on compile-time #defines and the cpu_* check and rely on the platform passing down the proper GPIO pin through platform data.

This is a prerequisite for getting rid of the local GPIO implementation in the AT91 platform and move toward multiplatform.

The patch also adds device tree support for getting the RTS GPIO pin from the device tree on DT boot paths.

Signed-off-by Nicolas Ferre <[email protected]>

Acked-by Jean-Christophe PLAGNIOL-VILLARD <[email protected]>

Signed-off-by Linus Walleij <[email protected]>

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ChangeLog v3->v4:

Quoted 12 lines

This passes the errata fix using a GPIO to control the RTS pin on one of the AT91 chips to use gpiolib instead of the AT91-specific interfaces. Also remove the reliance on compile-time #defines and the cpu_* check and rely on the platform passing down the proper GPIO pin through platform data.

This is a prerequisite for getting rid of the local GPIO implementation in the AT91 platform and move toward multiplatform.

Quoted 8 lines

The patch also adds device tree support for getting the RTS GPIO pin from the device tree on DT boot paths.

Signed-off-by Nicolas Ferre <[email protected]>

Acked-by Jean-Christophe PLAGNIOL-VILLARD <[email protected]>

Signed-off-by Linus Walleij <[email protected]>

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ChangeLog v3->v4:

Hi Nicolas, I don't see this patch in linux-next, where did it get stuck? Something I can help with? Greg has ACKed it and all I think ...

This passes the errata fix using a GPIO to control the RTS pin on one of the AT91 chips to use gpiolib instead of the AT91-specific interfaces. Also remove the reliance on compile-time #defines and the cpu_* check and rely on the platform passing down the proper GPIO pin through platform data.

This is a prerequisite for getting rid of the local GPIO implementation in the AT91 platform and move toward multiplatform.

The patch also adds device tree support for getting the RTS GPIO pin from the device tree on DT boot paths.

Signed-off-by Nicolas Ferre <[email protected]>

Acked-by Jean-Christophe PLAGNIOL-VILLARD <[email protected]>

Signed-off-by Linus Walleij <[email protected]>

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ChangeLog v3->v4:

Quoted 11 lines · Linus Walleij

This passes the errata fix using a GPIO to control the RTS pin on one of the AT91 chips to use gpiolib instead of the AT91-specific interfaces. Also remove the reliance on compile-time #defines and the cpu_* check and rely on the platform passing down the proper GPIO pin through platform data.

This is a prerequisite for getting rid of the local GPIO implementation in the AT91 platform and move toward multiplatform.

Quoted 8 lines

The patch also adds device tree support for getting the RTS GPIO pin from the device tree on DT boot paths.

Signed-off-by Nicolas Ferre <[email protected]>

Acked-by Jean-Christophe PLAGNIOL-VILLARD <[email protected]>

Signed-off-by Linus Walleij <[email protected]>

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ChangeLog v3->v4:

ARM SoC folks, if you're not taking this in through the <timex.h> removal series then please ACK this patch so I can take it through the GPIO tree instead (unless you want to apply this single patch, which would be even better, you have Greg's ACK in this thread).

Quoted 22 lines · Linus Walleij

Quoted 19 lines · Linus Walleij

This passes the errata fix using a GPIO to control the RTS pin on one of the AT91 chips to use gpiolib instead of the AT91-specific interfaces. Also remove the reliance on compile-time #defines and the cpu_* check and rely on the platform passing down the proper GPIO pin through platform data.

This is a prerequisite for getting rid of the local GPIO implementation in the AT91 platform and move toward multiplatform.

The patch also adds device tree support for getting the RTS GPIO pin from the device tree on DT boot paths.

Signed-off-by Nicolas Ferre <[email protected]>

Acked-by Jean-Christophe PLAGNIOL-VILLARD <[email protected]>

Signed-off-by Linus Walleij <[email protected]>

---
ChangeLog v3->v4:

Quoted 5 lines

ARM SoC folks, if you're not taking this in through the <timex.h> removal series then please ACK this patch so I can take it through the GPIO tree instead (unless you want to apply this single patch, which would be even better, you have Greg's ACK in this thread).

I can't find this patch in linux-next, did I missed something ?

Quoted 1 line · Richard Genoud

I can't find this patch in linux-next, did I missed something ?

Yeah, looks like we dropped the ball on it. We'll queue it up for 3.15 as soon as -rc1 is out.

Quoted 6 lines · Olof Johansson

Quoted 1 line · Richard Genoud

I can't find this patch in linux-next, did I missed something ?

Yeah, looks like we dropped the ball on it. We'll queue it up for 3.15 as soon as -rc1 is out.

OK it's out now ;-)