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From: Gao Pan <mailto:b54...@freescale.com> Sent: Friday, September 11, 2015
6:43 PM
> To: w...@the-dreams.de; u.kleine-koe...@pengutronix.de;
> shawn...@kernel.org; ker...@pengutronix.de
> Cc: linux-i2c@vger.kernel.org; Li Frank-B20596; Duan Fugang-B38611; Gao
> Pan-B54642; linux-arm-ker...@lists.infradead.org
> Subject: [Patch V5] ARM: dts: imx6qdl-sabresd: add i2c pinctrl gpio state
> for bus recovery
>
> When i2c bus SCL/SDA are stuck low during transfer, the i2c pinctrl
> should be configured to gpio mode to do bus recovery.
>
> Genenally, we can use sleep state for bus recovery. But it's not a good
> choice to use sleep state here because it will be confused. This patch
> introduces a dedicated gpio state.
>
> Signed-off-by: Fugang Duan <b38...@freescale.com>
> Signed-off-by: Gao Pan <b54...@freescale.com>
> ---
> arch/arm/boot/dts/imx6qdl-sabresd.dtsi | 12 +++++++++++-
> 1 file changed, 11 insertions(+), 1 deletion(-)
>
> diff --git a/arch/arm/boot/dts/imx6qdl-sabresd.dtsi
> b/arch/arm/boot/dts/imx6qdl-sabresd.dtsi
> index 944eb81..6e97018 100644
> --- a/arch/arm/boot/dts/imx6qdl-sabresd.dtsi
> +++ b/arch/arm/boot/dts/imx6qdl-sabresd.dtsi
> @@ -172,8 +172,11 @@
>
> &i2c1 {
> clock-frequency = <100000>;
> - pinctrl-names = "default";
> + pinctrl-names = "default", "gpio";
> pinctrl-0 = <&pinctrl_i2c1>;
> + pinctrl-1 = <&pinctrl_i2c1_gpio>;
> + scl-gpios = <&gpio5 26 0>;
> + sda-gpios = <&gpio5 27 0>;
> status = "okay";
>
> codec: wm8962@1a {
> @@ -393,6 +396,13 @@
> >;
> };
>
> + pinctrl_i2c1_gpio: i2c1grp_gpio {
> + fsl,pins = <
> + MX6QDL_PAD_CSI0_DAT8__GPIO5_IO26 0x1b0b0
> + MX6QDL_PAD_CSI0_DAT9__GPIO5_IO27 0x1b0b0
> + >
> + };
> +
> pinctrl_i2c2: i2c2grp {
> fsl,pins = <
> MX6QDL_PAD_KEY_COL3__I2C2_SCL
> 0x4001b8b1
> --
> 1.9.1
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