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Message-ID: <20200115115422.17097-2-codrin.ciubotariu@microchip.com>
Date: Wed, 15 Jan 2020 13:54:17 +0200
From: Codrin Ciubotariu <codrin.ciubotariu@...rochip.com>
To: <linux-i2c@...r.kernel.org>, <devicetree@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>,
<linux-kernel@...r.kernel.org>
CC: <kamel.bouhara@...tlin.com>, <wsa@...-dreams.de>,
<Nicolas.Ferre@...rochip.com>, <alexandre.belloni@...tlin.com>,
<Ludovic.Desroches@...rochip.com>, <robh@...nel.org>,
<peda@...ntia.se>, <linux@...linux.org.uk>,
Codrin Ciubotariu <codrin.ciubotariu@...rochip.com>
Subject: [PATCH v3 1/6] dt-bindings: i2c: at91: document optional bus recovery properties
From: Kamel Bouhara <kamel.bouhara@...tlin.com>
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@...tlin.com>
[codrin.ciubotariu@...rochip.com: rebased]
Signed-off-by: Codrin Ciubotariu <codrin.ciubotariu@...rochip.com>
Reviewed-by: Rob Herring <robh@...nel.org>
---
Changes in v3:
- rebased;
- added Reviewed-by tag from Rob;
Changes in v2:
- none;
Documentation/devicetree/bindings/i2c/i2c-at91.txt | 10 ++++++++++
1 file changed, 10 insertions(+)
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@...84000 {
@@ -64,6 +69,11 @@ i2c0: i2c@...34600 {
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";
--
2.20.1
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