linux-kernel - Re: [PATCH v2 3/5] ARM: dts: Add I2C1 support for STM32F429 SoC

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Message-ID: <CALszF6D4K1GsFdb0z3Lkb=EJdhzNnZNnAxeyCZGq36+Cnwf+_A@mail.gmail.com>
Date:	Thu, 2 Jun 2016 18:07:11 +0200
From:	Maxime Coquelin <mcoquelin.stm32@...il.com>
To:	"M'boumba Cedric Madianga" <cedric.madianga@...il.com>
Cc:	Patrice Chotard <patrice.chotard@...com>,
	Wolfram Sang <wsa@...-dreams.de>,
	Rob Herring <robh+dt@...nel.org>, linux@...linux.org.uk,
	linux-i2c@...r.kernel.org,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 3/5] ARM: dts: Add I2C1 support for STM32F429 SoC

2016-06-02 16:26 GMT+02:00 M'boumba Cedric Madianga <cedric.madianga@...il.com>:
> Signed-off-by: Patrice Chotard <patrice.chotard@...com>
> Signed-off-by: M'boumba Cedric Madianga <cedric.madianga@...il.com>
> ---
>  arch/arm/boot/dts/stm32f429.dtsi | 24 ++++++++++++++++++++++++
>  1 file changed, 24 insertions(+)
>
> diff --git a/arch/arm/boot/dts/stm32f429.dtsi b/arch/arm/boot/dts/stm32f429.dtsi
> index 434d4b9..d5857eb 100644
> --- a/arch/arm/boot/dts/stm32f429.dtsi
> +++ b/arch/arm/boot/dts/stm32f429.dtsi
> @@ -323,6 +323,18 @@
>                                         slew-rate = <2>;
>                                 };
>                         };
> +
> +                       i2c1_sda_pin: i2c1_sda@0 {
> +                               pins {
> +                                       pinmux = <STM32F429_PB9_FUNC_I2C1_SDA>;
> +                                       drive-open-drain;
> +                               };
> +                       };
> +                       i2c1_scl_pin: i2c1_scl@0 {
> +                               pins {
> +                                       pinmux = <STM32F429_PB6_FUNC_I2C1_SCL>;
> +                               };
> +                       };
>                 };
Shouldn't be preferrable to group the two functions in a single one,
as done for usart config in this file?:

            usart1_pins_a: usart1@0 {
                pins1 {
                    pinmux = <STM32F429_PA9_FUNC_USART1_TX>;
                    bias-disable;
                    drive-push-pull;
                    slew-rate = <0>;
                };
                pins2 {
                    pinmux = <STM32F429_PA10_FUNC_USART1_RX>;
                    bias-disable;
                };
            };

Also, I would prefer the phandle to be suffixed with the port number,
as multiple muxing options are available, for example "i2c1_pins_b".

Thanks,
Maxime