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i2c: mux: demux-pinctrl: make drivers with no pinctrl work again 

Some drivers like i2c-gpio do not have dedicated pinctrl states. They
broke when error checking for pinctrl was added. Detect them now, and in
their case, simply skip over pinctrl configuration.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Wolfram Sang 2016-11-06 21:20:32 +01:00 committed by Wolfram Sang
parent bc33b0ca11
commit d052db11c1
1 changed files with 20 additions and 2 deletions
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22
drivers/i2c/muxes/i2c-demux-pinctrl.c
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@ -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;