diff options
Diffstat (limited to 'drivers/i2c/muxes')
| -rw-r--r-- | drivers/i2c/muxes/i2c-demux-pinctrl.c | 22 |
1 files changed, 20 insertions, 2 deletions
diff --git a/drivers/i2c/muxes/i2c-demux-pinctrl.c b/drivers/i2c/muxes/i2c-demux-pinctrl.c index b3893f6282ba..3e6fe1760d82 100644 --- a/drivers/i2c/muxes/i2c-demux-pinctrl.c +++ b/drivers/i2c/muxes/i2c-demux-pinctrl.c @@ -69,10 +69,28 @@ static int i2c_demux_activate_master(struct i2c_demux_pinctrl_priv *priv, u32 ne goto err_with_revert; } - p = devm_pinctrl_get_select(adap->dev.parent, priv->bus_name); + /* + * Check if there are pinctrl states at all. Note: we cant' use + * devm_pinctrl_get_select() because we need to distinguish between + * the -ENODEV from devm_pinctrl_get() and pinctrl_lookup_state(). + */ + p = devm_pinctrl_get(adap->dev.parent); if (IS_ERR(p)) { ret = PTR_ERR(p); - goto err_with_put; + /* continue if just no pinctrl states (e.g. i2c-gpio), otherwise exit */ + if (ret != -ENODEV) + goto err_with_put; + } else { + /* there are states. check and use them */ + struct pinctrl_state *s = pinctrl_lookup_state(p, priv->bus_name); + + if (IS_ERR(s)) { + ret = PTR_ERR(s); + goto err_with_put; + } + ret = pinctrl_select_state(p, s); + if (ret < 0) + goto err_with_put; } priv->chan[new_chan].parent_adap = adap; |