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dt-bindings: i2c: at91: document optional bus recovery properties

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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 <kamel.bouhara@bootlin.com>
[codrin.ciubotariu@microchip.com: rebased]
Signed-off-by: Codrin Ciubotariu <codrin.ciubotariu@microchip.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Acked-by: Ludovic Desroches <ludovic.desroches@microchip.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Kamel Bouhara 2020-01-15 13:54:17 +02:00 committed by Wolfram Sang
parent f8788d86ab
commit 19e5cef058
1 changed files with 10 additions and 0 deletions
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10
Documentation/devicetree/bindings/i2c/i2c-at91.txt
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@ -28,8 +28,13 @@ Optional properties:
"atmel,sama5d4-i2c", "atmel,sama5d4-i2c",
"atmel,sama5d2-i2c", "atmel,sama5d2-i2c",
"microchip,sam9x60-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 - Child nodes conforming to i2c bus binding
Examples : Examples :
i2c0: i2c@fff84000 { i2c0: i2c@fff84000 {
@ -64,6 +69,11 @@ i2c0: i2c@f8034600 {
clocks = <&flx0>; clocks = <&flx0>;
atmel,fifo-size = <16>; atmel,fifo-size = <16>;
i2c-sda-hold-time-ns = <336>; 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 { wm8731: wm8731@1a {
compatible = "wm8731"; compatible = "wm8731";