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i2c: add i2c driver for stm32

PATCH New patrice.chotard at st.com 3 participants 3 messages Aug 9, 2017 – Aug 23, 2017

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Arm STM32 I2C
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PATCH v2 1/1 i2c: add i2c driver for stm32

From: Patrice Chotard <[email protected]>

Add i2c driver which can be used on both STM32F7 and STM32H7. This I2C block supports the following features:
_ Slave and master modes
_ Multimaster capability
_ Standard-mode (up to 100 kHz)
_ Fast-mode (up to 400 kHz)
_ Fast-mode Plus (up to 1 MHz)
_ 7-bit and 10-bit addressing mode
_ Multiple 7-bit slave addresses (2 addresses, 1 with configurable mask) _ All 7-bit addresses acknowledge mode
_ General call
_ Programmable setup and hold times
_ Easy to use event management
_ Optional clock stretching
_ Software reset

Signed-off-by Christophe Kerello <[email protected]>
Signed-off-by Patrice Chotard <[email protected]>

---

v2: _ add I2C controller description in Kconfig
_ rename stm32_i2c_dev struct to stm32_i2c_priv
_ add comment for stm32_i2c_handle_reload()
_ split stm32_i2c_compute_timing() code and add :
_ stm32_i2c_compute_solutions() which computes list of possible timings candidate _ stm32_i2c_choose_solution() which selects the best timing
_ use #defines instead of hard coded vlaue for speed in
stm32_i2c_set_bus_speed() and in i2c_specs[] array
_ move part of code of stm32_i2c_probe() inside stm32_ofdata_to_platdata()

 doc/device-tree-bindings/i2c/i2c-stm32.txt |  30 +
 drivers/i2c/Kconfig                        |  20 +
 drivers/i2c/Makefile                       |   1 +
 drivers/i2c/stm32f7_i2c.c                  | 882 +++++++++++++++++++++++++++++
 4 files changed, 933 insertions(+)
 create mode 100644 doc/device-tree-bindings/i2c/i2c-stm32.txt
 create mode 100644 drivers/i2c/stm32f7_i2c.c
doc/device-tree-bindings/i2c/i2c-stm32.txt new file +30 -0
new file mode 100644
index 0000000..df03743
@@ -0,0 +1,30 @@
+* I2C controller embedded in STMicroelectronis STM32 platforms
+
+Required properties :
+- compatible : Must be "st,stm32f7-i2c"
+- reg : Offset and length of the register set for the device
+- resets: Must contain the phandle to the reset controller
+- clocks: Must contain the input clock of the I2C instance
+- A pinctrl state named "default" must be defined to set pins in mode of
+  operation for I2C transfer
+- #address-cells = <1>;
+- #size-cells = <0>;
+
+Optional properties :
+- clock-frequency : Desired I2C bus clock frequency in Hz. If not specified,
+  the default 100 kHz frequency will be used. As only Normal, Fast and Fast+
+  modes are implemented, possible values are 100000, 400000 and 1000000.
+
+Example :
+
+	i2c1: i2c at 40005400 {
+		compatible = "st,stm32f7-i2c";
+		reg = <0x40005400 0x400>;
+		resets = <&rcc 181>;
+		clocks = <&clk_pclk1>;
+		pinctrl-names = "default";
+		pinctrl-0 = <&pinctrl_i2c1>;
+		clock-frequency = <400000>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+	};
drivers/i2c/Kconfig +20 -0
index 8ac1cc6..749d52e 100644
@@ -168,6 +168,26 @@ config SYS_I2C_S3C24X0
 	help
 	  Support for Samsung I2C controller as Samsung SoCs.
 
+config SYS_I2C_STM32F7
+	bool "STMicroelectronics STM32F7 I2C support"
+	depends on (STM32F7 || STM32H7) && DM_I2C
+	help
+	  Enable this option to add support for STM32 I2C controller
+	  introduced with STM32F7/H7 SoCs. This I2C controller supports :
+	   _ Slave and master modes
+	   _ Multimaster capability
+	   _ Standard-mode (up to 100 kHz)
+	   _ Fast-mode (up to 400 kHz)
+	   _ Fast-mode Plus (up to 1 MHz)
+	   _ 7-bit and 10-bit addressing mode
+	   _ Multiple 7-bit slave addresses (2 addresses, 1 with configurable mask)
+	   _ All 7-bit addresses acknowledge mode
+	   _ General call
+	   _ Programmable setup and hold times
+	   _ Easy to use event management
+	   _ Optional clock stretching
+	   _ Software reset
+
 config SYS_I2C_UNIPHIER
 	bool "UniPhier I2C driver"
 	depends on ARCH_UNIPHIER && DM_I2C
drivers/i2c/Makefile +1 -0
index 4bbf0c9..9b88732 100644
@@ -38,6 +38,7 @@ obj-$(CONFIG_SYS_I2C_S3C24X0) += s3c24x0_i2c.o exynos_hs_i2c.o
 obj-$(CONFIG_SYS_I2C_SANDBOX) += sandbox_i2c.o i2c-emul-uclass.o
 obj-$(CONFIG_SYS_I2C_SH) += sh_i2c.o
 obj-$(CONFIG_SYS_I2C_SOFT) += soft_i2c.o
+obj-$(CONFIG_SYS_I2C_STM32F7) += stm32f7_i2c.o
 obj-$(CONFIG_SYS_I2C_TEGRA) += tegra_i2c.o
 obj-$(CONFIG_SYS_I2C_UNIPHIER) += i2c-uniphier.o
 obj-$(CONFIG_SYS_I2C_UNIPHIER_F) += i2c-uniphier-f.o
drivers/i2c/stm32f7_i2c.c new file +882 -0

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Signature · 1 line
1.9.1
#1 lore raw

PATCH v2 1/1 i2c: add i2c driver for stm32

Quoted 32 lines · On 9 August 2017 at 06:45, <[email protected]> wrote:

From: Patrice Chotard <[email protected]>

Add i2c driver which can be used on both STM32F7 and STM32H7. This I2C block supports the following features:
_ Slave and master modes
_ Multimaster capability
_ Standard-mode (up to 100 kHz)
_ Fast-mode (up to 400 kHz)
_ Fast-mode Plus (up to 1 MHz)
_ 7-bit and 10-bit addressing mode
_ Multiple 7-bit slave addresses (2 addresses, 1 with configurable mask) _ All 7-bit addresses acknowledge mode
_ General call
_ Programmable setup and hold times
_ Easy to use event management
_ Optional clock stretching
_ Software reset

Signed-off-by Christophe Kerello <[email protected]>
Signed-off-by Patrice Chotard <[email protected]>

---

v2: _ add I2C controller description in Kconfig
_ rename stm32_i2c_dev struct to stm32_i2c_priv
_ add comment for stm32_i2c_handle_reload()
_ split stm32_i2c_compute_timing() code and add :
_ stm32_i2c_compute_solutions() which computes list of possible timings candidate _ stm32_i2c_choose_solution() which selects the best timing
_ use #defines instead of hard coded vlaue for speed in
stm32_i2c_set_bus_speed() and in i2c_specs[] array
_ move part of code of stm32_i2c_probe() inside stm32_ofdata_to_platdata()

Quoted 7 lines
 doc/device-tree-bindings/i2c/i2c-stm32.txt |  30 +
 drivers/i2c/Kconfig                        |  20 +
 drivers/i2c/Makefile                       |   1 +
 drivers/i2c/stm32f7_i2c.c                  | 882 +++++++++++++++++++++++++++++
 4 files changed, 933 insertions(+)
 create mode 100644 doc/device-tree-bindings/i2c/i2c-stm32.txt
 create mode 100644 drivers/i2c/stm32f7_i2c.c
Reviewed-by Simon Glass <[email protected]>
#2 lore raw

PATCH v2 1/1 i2c: add i2c driver for stm32

In reply to patrice.chotard at st.com

Hello Partrice,

Am 09.08.2017 um 14:45 schrieb patrice.chotard at st.com:

Quoted 32 lines

From: Patrice Chotard <[email protected]>

Add i2c driver which can be used on both STM32F7 and STM32H7. This I2C block supports the following features:
_ Slave and master modes
_ Multimaster capability
_ Standard-mode (up to 100 kHz)
_ Fast-mode (up to 400 kHz)
_ Fast-mode Plus (up to 1 MHz)
_ 7-bit and 10-bit addressing mode
_ Multiple 7-bit slave addresses (2 addresses, 1 with configurable mask) _ All 7-bit addresses acknowledge mode
_ General call
_ Programmable setup and hold times
_ Easy to use event management
_ Optional clock stretching
_ Software reset

Signed-off-by Christophe Kerello <[email protected]>
Signed-off-by Patrice Chotard <[email protected]>

---

v2: _ add I2C controller description in Kconfig
_ rename stm32_i2c_dev struct to stm32_i2c_priv
_ add comment for stm32_i2c_handle_reload()
_ split stm32_i2c_compute_timing() code and add :
_ stm32_i2c_compute_solutions() which computes list of possible timings candidate _ stm32_i2c_choose_solution() which selects the best timing
_ use #defines instead of hard coded vlaue for speed in
stm32_i2c_set_bus_speed() and in i2c_specs[] array
_ move part of code of stm32_i2c_probe() inside stm32_ofdata_to_platdata()

Quoted 7 lines
  doc/device-tree-bindings/i2c/i2c-stm32.txt |  30 +
  drivers/i2c/Kconfig                        |  20 +
  drivers/i2c/Makefile                       |   1 +
  drivers/i2c/stm32f7_i2c.c                  | 882 +++++++++++++++++++++++++++++
  4 files changed, 933 insertions(+)

create mode 100644 doc/device-tree-bindings/i2c/i2c-stm32.txt create mode 100644 drivers/i2c/stm32f7_i2c.c

Applied to u-boot-i2c.git master

Thanks!

bye,
Heiko

Signature · 2 lines
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