diff options
Diffstat (limited to 'Documentation/devicetree/bindings/i2c/i2c-imx.txt')
| -rw-r--r-- | Documentation/devicetree/bindings/i2c/i2c-imx.txt | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/i2c/i2c-imx.txt b/Documentation/devicetree/bindings/i2c/i2c-imx.txt index 4a8513e44740..552929771ea5 100644 --- a/Documentation/devicetree/bindings/i2c/i2c-imx.txt +++ b/Documentation/devicetree/bindings/i2c/i2c-imx.txt @@ -26,3 +26,26 @@ i2c@70038000 { /* HS-I2C on i.MX51 */ interrupts = <64>; clock-frequency = <400000>; }; + +The driver can provide recovery functionality for cases were the bus gets +stack with SDA pulled low. +In order to enable this one has to specify an additional pinctrl property with +the name 'recovery' to mux GPIO functionality on SDA/SCA and a gpios +property with the GPIOs for SDA/SCL. +The lack of the gpios property disables the functionality. + +Examples: +&i2c3 { + clock-frequency = <100000>; + pinctrl-names = "default", "recovery"; + pinctrl-0 = <&pinctrl_i2c3_1>; + pinctrl-1 = <&pinctrl_i2c3_recovery_1>; + gpios = <&gpio3 18 0 /* sda */ + &gpio3 17 0 /* scl */ + >; + status = "disabled"; +}; + +When e.g. a device driver detects a stuck bus +int i2c_recover_bus(struct i2c_adapter *adap) +can be called to try to recover the bus. |