diff options
| author | Martin DEVERA <devik@eaxlabs.cz> | 2020-08-05 11:28:11 +0200 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2020-09-12 18:11:09 +0200 |
| commit | 6d8e04f9d38345770572a39125a47da37bb8ce9e (patch) | |
| tree | bd0affa18a85aaac68365e3213a5fd6b6e4305b6 /drivers/pinctrl | |
| parent | 0662e4a190cfdb50df7a00bbc9aebe3ed3f09474 (diff) | |
| download | linux-6d8e04f9d38345770572a39125a47da37bb8ce9e.tar.bz2 | |
pinctrl: sx150x: Fix pinctrl enablement order bug
I encountered bug in SX1502 expander driver in 5.7.7. Here is relevant
DTS part:
compatible = "semtech,sx1502q";
gpio4_cfg_pins: gpio2-cfg {
pins = "gpio5";
output-high;
};
And part of OOPS:
[ 0.673996] [<c023cfa6>] (gpiochip_get_data) from [<c023b235>]
(sx150x_gpio_direction_output+0xd)
[ 0.683259] [<c023b235>] (sx150x_gpio_direction_output) from
[<c023b363>] (sx150x_pinconf_set+0x)
[ 0.692796] [<c023b363>] (sx150x_pinconf_set) from [<c0238fef>]
(pinconf_apply_setting+0x39/0x7e)
[ 0.701635] [<c0238fef>] (pinconf_apply_setting) from [<c0236c77>]
(pinctrl_commit_state+0xa5/0x)
[ 0.710648] [<c0236c77>] (pinctrl_commit_state) from [<c0237e03>]
(pinctrl_enable+0xff/0x1d4)
[ 0.719139] [<c0237e03>] (pinctrl_enable) from [<c023b791>]
(sx150x_probe+0x1a3/0x358)
[ 0.727027] [<c023b791>] (sx150x_probe) from [<c02c38bf>]
(i2c_device_probe+0x1bb/0x1dc)
The problem is that sx150x_pinconf_set uses sx150x_gpio_direction_output
but gpio is not setup yet. Patch below fixes it but I'm not sure whether
is it correct.
Link: https://lore.kernel.org/r/f32130bf-cfd4-b1bf-538c-dbc9ee2d947a@eaxlabs.cz
Signed-off-by: Martin DEVERA <devik@eaxlabs.cz>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/pinctrl')
| -rw-r--r-- | drivers/pinctrl/pinctrl-sx150x.c | 17 |
1 files changed, 11 insertions, 6 deletions
diff --git a/drivers/pinctrl/pinctrl-sx150x.c b/drivers/pinctrl/pinctrl-sx150x.c index b325a136ac48..c110f780407b 100644 --- a/drivers/pinctrl/pinctrl-sx150x.c +++ b/drivers/pinctrl/pinctrl-sx150x.c @@ -1154,12 +1154,6 @@ static int sx150x_probe(struct i2c_client *client, return ret; } - ret = pinctrl_enable(pctl->pctldev); - if (ret) { - dev_err(dev, "Failed to enable pinctrl device\n"); - return ret; - } - /* Register GPIO controller */ pctl->gpio.base = -1; pctl->gpio.ngpio = pctl->data->npins; @@ -1238,6 +1232,17 @@ static int sx150x_probe(struct i2c_client *client, if (ret) return ret; + /* + * Pin control functions need to be enabled AFTER registering the + * GPIO chip because sx150x_pinconf_set() calls + * sx150x_gpio_direction_output(). + */ + ret = pinctrl_enable(pctl->pctldev); + if (ret) { + dev_err(dev, "Failed to enable pinctrl device\n"); + return ret; + } + ret = gpiochip_add_pin_range(&pctl->gpio, dev_name(dev), 0, 0, pctl->data->npins); if (ret) |