clk: Add Artpec-6 SoC support

Add clock support for the Artpec-6 SoC port. The ARM parts are merged in 4.6-rc1.

Changes since v5:
- Improved code formatting.
- Pass device pointer when registering the clocks.
- Detect registration failures in the probe function.

Changes since v4:
- Update the maintainer entry with the correct clock directory.
- Implement split clock registration with early clocks through CLK_OF_DECLARE and deferrable clocks through a platform driver.

Changes since v3:
- The binding was corrected to handle two fractional divider clocks as input to the clock controller.
- Updated clk-artpec6.c to handle a distinct fractional divider input for each i2s clock mux.

Changes since v2:
- Moved axis,artpec6-clkctrl.h to the first patch with the DT bindings.

Changes since v1:
- The driver now provides all clocks from the main clock controller block through one DT node.
- Added a header file for the clock indexes.
- Refer to clock-bindings.txt in the bindings document.

Lars Persson (2):
clk: add device tree binding for Artpec-6 clock controller
clk: add artpec-6 clock controller

Lars Persson (2):
clk: add device tree binding for Artpec-6 clock controller
clk: add artpec-6 clock controller

 .../devicetree/bindings/clock/artpec6.txt          |  41 ++++
 MAINTAINERS                                        |   2 +-
 drivers/clk/Makefile                               |   1 +
 drivers/clk/axis/Makefile                          |   1 +
 drivers/clk/axis/clk-artpec6.c                     | 242 +++++++++++++++++++++
 include/dt-bindings/clock/axis,artpec6-clkctrl.h   |  38 ++++
 6 files changed, 324 insertions(+), 1 deletion(-)
 create mode 100644 Documentation/devicetree/bindings/clock/artpec6.txt
 create mode 100644 drivers/clk/axis/Makefile
 create mode 100644 drivers/clk/axis/clk-artpec6.c
 create mode 100644 include/dt-bindings/clock/axis,artpec6-clkctrl.h

2.1.4

Add device tree documentation for the main clock controller in the Artpec-6 SoC.

---
 .../devicetree/bindings/clock/artpec6.txt          | 41 ++++++++++++++++++++++
 include/dt-bindings/clock/axis,artpec6-clkctrl.h   | 38 ++++++++++++++++++++
 2 files changed, 79 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/clock/artpec6.txt
 create mode 100644 include/dt-bindings/clock/axis,artpec6-clkctrl.h

new file mode 100644
index 0000000..9ba9bd0
@@ -0,0 +1,41 @@
+* Clock bindings for Axis ARTPEC-6 chip
+
+The bindings are based on the clock provider binding in
+Documentation/devicetree/bindings/clock/clock-bindings.txt
+
+External clocks:
+----------------
+
+There are two external inputs to the main clock controller which should be
+provided using the common clock bindings.
+- "sys_refclk": External 50 Mhz oscillator (required)
+- "i2s_refclk": Alternate audio reference clock (optional).
+
+Main clock controller
+---------------------
+
+Required properties:
+- #clock-cells: Should be <1>
+  See dt-bindings/clock/axis,artpec6-clkctrl.h for the list of valid identifiers.
+- compatible: Should be "axis,artpec6-clkctrl"
+- reg: Must contain the base address and length of the system controller
+- clocks:  Must contain a phandle entry for each clock in clock-names
+- clock-names: Must include the external oscillator ("sys_refclk"). Optional
+  ones are the audio reference clock ("i2s_refclk") and the audio fractional
+  dividers ("frac_clk0" and "frac_clk1").
+
+Examples:
+
+ext_clk: ext_clk {
+	#clock-cells = <0>;
+	compatible = "fixed-clock";
+	clock-frequency = <50000000>;
+};
+
+clkctrl: clkctrl {
+	#clock-cells = <1>;
+	compatible = "axis,artpec6-clkctrl";
+	reg = <0xf8000000 0x48>;
+	clocks = <&ext_clk>;
+	clock-names = "sys_refclk";
+};

new file mode 100644
index 0000000..f9f04dc
@@ -0,0 +1,38 @@
+/*
+ * ARTPEC-6 clock controller indexes
+ *
+ * Copyright 2016 Axis Comunications AB.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef DT_BINDINGS_CLK_ARTPEC6_CLKCTRL_H
+#define DT_BINDINGS_CLK_ARTPEC6_CLKCTRL_H
+
+#define ARTPEC6_CLK_CPU			0
+#define ARTPEC6_CLK_CPU_PERIPH		1
+#define ARTPEC6_CLK_NAND_CLKA		2
+#define ARTPEC6_CLK_NAND_CLKB		3
+#define ARTPEC6_CLK_ETH_ACLK		4
+#define ARTPEC6_CLK_DMA_ACLK		5
+#define ARTPEC6_CLK_PTP_REF		6
+#define ARTPEC6_CLK_SD_PCLK		7
+#define ARTPEC6_CLK_SD_IMCLK		8
+#define ARTPEC6_CLK_I2S_HST		9
+#define ARTPEC6_CLK_I2S0_CLK		10
+#define ARTPEC6_CLK_I2S1_CLK		11
+#define ARTPEC6_CLK_UART_PCLK		12
+#define ARTPEC6_CLK_UART_REFCLK		13
+#define ARTPEC6_CLK_I2C			14
+#define ARTPEC6_CLK_SPI_PCLK		15
+#define ARTPEC6_CLK_SPI_SSPCLK		16
+#define ARTPEC6_CLK_SYS_TIMER		17
+#define ARTPEC6_CLK_FRACDIV_IN		18
+#define ARTPEC6_CLK_DBG_PCLK		19
+
+/* This must be the highest clock index plus one. */
+#define ARTPEC6_CLK_NUMCLOCKS		20
+
+#endif

2.1.4

Applied to clk-artpec6 and merged into clk-next.

Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project

Add a driver for the main clock controller of the Artpec-6 Soc.

---
 MAINTAINERS                    |   2 +-
 drivers/clk/Makefile           |   1 +
 drivers/clk/axis/Makefile      |   1 +
 drivers/clk/axis/clk-artpec6.c | 242 +++++++++++++++++++++++++++++++++++++++++
 4 files changed, 245 insertions(+), 1 deletion(-)
 create mode 100644 drivers/clk/axis/Makefile
 create mode 100644 drivers/clk/axis/clk-artpec6.c

index 378ebff..074e39e 100644
@@ -973,7 +973,7 @@ S:	Maintained
 L:	[email protected]
 F:	arch/arm/mach-artpec
 F:	arch/arm/boot/dts/artpec6*
-F:	drivers/clk/clk-artpec6.c
+F:	drivers/clk/axis
 
 ARM/ATMEL AT91RM9200, AT91SAM9 AND SAMA5 SOC SUPPORT
 M:	Nicolas Ferre <[email protected]>

index 46869d6..ca9aa7b 100644
@@ -51,6 +51,7 @@ obj-$(CONFIG_COMMON_CLK_WM831X)		+= clk-wm831x.o
 obj-$(CONFIG_COMMON_CLK_XGENE)		+= clk-xgene.o
 obj-$(CONFIG_COMMON_CLK_PWM)		+= clk-pwm.o
 obj-$(CONFIG_COMMON_CLK_AT91)		+= at91/
+obj-$(CONFIG_ARCH_ARTPEC)		+= axis/
 obj-y					+= bcm/
 obj-$(CONFIG_ARCH_BERLIN)		+= berlin/
 obj-$(CONFIG_ARCH_HISI)			+= hisilicon/

new file mode 100644
index 0000000..628c9d3
@@ -0,0 +1 @@
+obj-$(CONFIG_MACH_ARTPEC6)	+= clk-artpec6.o

2.1.4

Applied to clk-artpec6 and merged into clk-next.

Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project