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Message-ID: <1505399319-14782-2-git-send-email-pierre-yves.mordret@st.com> Date: Thu, 14 Sep 2017 16:28:35 +0200 From: Pierre-Yves MORDRET <pierre-yves.mordret@...com> To: Wolfram Sang <wsa@...-dreams.de>, Rob Herring <robh+dt@...nel.org>, Mark Rutland <mark.rutland@....com>, Maxime Coquelin <mcoquelin.stm32@...il.com>, Alexandre Torgue <alexandre.torgue@...com>, Russell King <linux@...linux.org.uk>, <linux-i2c@...r.kernel.org>, <devicetree@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org> CC: Pierre-Yves MORDRET <pierre-yves.mordret@...com> Subject: [PATCH v4 1/5] dt-bindings: i2c-stm32: Document the STM32F7 I2C bindings This patch adds the documentation of device tree bindings for STM32F7 I2C Signed-off-by: M'boumba Cedric Madianga <cedric.madianga@...il.com> Signed-off-by: Pierre-Yves MORDRET <pierre-yves.mordret@...com> Acked-by: Rob Herring <robh@...nel.org> --- Version history: v4: v3: * None v2: * Remove i2c-timing binding in order to use generic bindings SCL Rising and Falling time instead --- --- .../devicetree/bindings/i2c/i2c-stm32.txt | 29 +++++++++++++++++++--- 1 file changed, 26 insertions(+), 3 deletions(-) diff --git a/Documentation/devicetree/bindings/i2c/i2c-stm32.txt b/Documentation/devicetree/bindings/i2c/i2c-stm32.txt index 78eaf7b..3b54899 100644 --- a/Documentation/devicetree/bindings/i2c/i2c-stm32.txt +++ b/Documentation/devicetree/bindings/i2c/i2c-stm32.txt @@ -1,7 +1,9 @@ * I2C controller embedded in STMicroelectronics STM32 I2C platform Required properties : -- compatible : Must be "st,stm32f4-i2c" +- compatible : Must be one of the following + - "st,stm32f4-i2c" + - "st,stm32f7-i2c" - reg : Offset and length of the register set for the device - interrupts : Must contain the interrupt id for I2C event and then the interrupt id for I2C error. @@ -14,8 +16,16 @@ Required properties : 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 and Fast modes - are supported, possible values are 100000 and 400000. + the default 100 kHz frequency will be used. + For STM32F4 SoC Standard-mode and Fast-mode are supported, possible values are + 100000 and 400000. + For STM32F7 SoC, Standard-mode, Fast-mode and Fast-mode Plus are supported, + possible values are 100000, 400000 and 1000000. +- i2c-scl-rising-time-ns : Only for STM32F7, I2C SCL Rising time for the board + (default: 25) +- i2c-scl-falling-time-ns : Only for STM32F7, I2C SCL Falling time for the board + (default: 10) + I2C Timings are derived from these 2 values Example : @@ -31,3 +41,16 @@ Example : pinctrl-0 = <&i2c1_sda_pin>, <&i2c1_scl_pin>; pinctrl-names = "default"; }; + + i2c@...05400 { + compatible = "st,stm32f7-i2c"; + #address-cells = <1>; + #size-cells = <0>; + reg = <0x40005400 0x400>; + interrupts = <31>, + <32>; + resets = <&rcc STM32F7_APB1_RESET(I2C1)>; + clocks = <&rcc 1 CLK_I2C1>; + pinctrl-0 = <&i2c1_sda_pin>, <&i2c1_scl_pin>; + pinctrl-names = "default"; + }; -- 2.7.4
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