diff options
| author | Max Krummenacher <max.krummenacher@toradex.com> | 2015-04-02 12:42:51 +0200 |
|---|---|---|
| committer | Max Krummenacher <max.krummenacher@toradex.com> | 2015-04-02 16:23:30 +0200 |
| commit | 88731dc0e8b6ba244e097b412b302acf3b9cc889 (patch) | |
| tree | 8c2d0b647a336c68274c41f89ee6d33372ab185d /arch | |
| parent | 512dc8ed77ec5ad4cf0be3c70732bf583410c7c2 (diff) | |
i2c-imx: add gpio recovery functionality
If the I2C is disturbed by other signals sometimes the i2c-imx bus gets stuck
with SDA being low.
This adds a recovery function to the bus driver.
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.
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/boot/dts/imx6qdl-apalis.dtsi | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/arch/arm/boot/dts/imx6qdl-apalis.dtsi b/arch/arm/boot/dts/imx6qdl-apalis.dtsi index f57b0750a5f1..545e23a048db 100644 --- a/arch/arm/boot/dts/imx6qdl-apalis.dtsi +++ b/arch/arm/boot/dts/imx6qdl-apalis.dtsi @@ -409,8 +409,12 @@ */ &i2c3 { clock-frequency = <100000>; - pinctrl-names = "default"; + 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"; }; @@ -540,6 +544,12 @@ MX6QDL_PAD_EIM_D16__GPIO3_IO16 PAD_CTRL_HYS_PU /* DDC bitbang */ >; }; + pinctrl_i2c3_recovery_1: i2c2_recovery { + fsl,pins = < + MX6QDL_PAD_EIM_D17__GPIO3_IO17 PAD_CTRL_HYS_PU /* DDC bitbang */ + MX6QDL_PAD_EIM_D18__GPIO3_IO18 PAD_CTRL_HYS_PU /* DDC bitbang */ + >; + }; pinctrl_mmc_cd: gpio_mmc_cd { fsl,pins = < MX6QDL_PAD_DI0_PIN4__GPIO4_IO20 PAD_CTRL_NO /* MMC1 CD */ |