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authorKamel Bouhara <kamel.bouhara@bootlin.com>2020-01-15 13:54:17 +0200
committerWolfram Sang <wsa@the-dreams.de>2020-02-26 11:06:41 +0100
commit19e5cef058a0089af4148d79af4658245a6952d2 (patch)
tree9ed6ff198613a498f40d31d814eeb19fd0938b1a
parentf8788d86ab28f61f7b46eb6be375f8a726783636 (diff)
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 <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>
-rw-r--r--Documentation/devicetree/bindings/i2c/i2c-at91.txt10
1 files changed, 10 insertions, 0 deletions
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";