From 19e5cef058a0089af4148d79af4658245a6952d2 Mon Sep 17 00:00:00 2001 From: Kamel Bouhara Date: Wed, 15 Jan 2020 13:54:17 +0200 Subject: dt-bindings: i2c: at91: document optional bus recovery properties The at91 I2C controller can support bus recovery by re-assigning SCL and SDA to gpios. Add the optional pinctrl and gpio properties to do so. Signed-off-by: Kamel Bouhara [codrin.ciubotariu@microchip.com: rebased] Signed-off-by: Codrin Ciubotariu Reviewed-by: Rob Herring Acked-by: Ludovic Desroches Signed-off-by: Wolfram Sang --- Documentation/devicetree/bindings/i2c/i2c-at91.txt | 10 ++++++++++ 1 file changed, 10 insertions(+) (limited to 'Documentation/devicetree/bindings/i2c/i2c-at91.txt') diff --git a/Documentation/devicetree/bindings/i2c/i2c-at91.txt b/Documentation/devicetree/bindings/i2c/i2c-at91.txt index d4bad86107b8..96c914e048f5 100644 --- a/Documentation/devicetree/bindings/i2c/i2c-at91.txt +++ b/Documentation/devicetree/bindings/i2c/i2c-at91.txt @@ -28,8 +28,13 @@ Optional properties: "atmel,sama5d4-i2c", "atmel,sama5d2-i2c", "microchip,sam9x60-i2c". +- scl-gpios: specify the gpio related to SCL pin +- sda-gpios: specify the gpio related to SDA pin +- pinctrl: add extra pinctrl to configure i2c pins to gpio function for i2c + bus recovery, call it "gpio" state - Child nodes conforming to i2c bus binding + Examples : i2c0: i2c@fff84000 { @@ -64,6 +69,11 @@ i2c0: i2c@f8034600 { clocks = <&flx0>; atmel,fifo-size = <16>; i2c-sda-hold-time-ns = <336>; + pinctrl-names = "default", "gpio"; + pinctrl-0 = <&pinctrl_i2c0>; + pinctrl-1 = <&pinctrl_i2c0_gpio>; + sda-gpios = <&pioA 30 GPIO_ACTIVE_HIGH>; + scl-gpios = <&pioA 31 GPIO_ACTIVE_HIGH>; wm8731: wm8731@1a { compatible = "wm8731"; -- cgit