pinctrl: msm: Fix msm_config_group_get() to be compliant

If you do this on an sdm845 board:
  cat /sys/kernel/debug/pinctrl/3400000.pinctrl/pinconf-groups

...it looks like nonsense.  For every pin you see listed:
  input bias bus hold, input bias disabled, input bias pull down, input bias pull up

That's because msm_config_group_get() isn't complying with the rules
that pinconf_generic_dump_one() expects.  Specifically for boolean
parameters (anything with a "struct pin_config_item" where has_arg is
false) the function expects that the function should return its value
not through the "config" parameter but should return "0" if the value
is set and "-EINVAL" if the value isn't set.

Let's fix this.

From a quick sample of other pinctrl drivers, it appears to be
tradition to also return 1 through the config parameter for these
boolean parameters when they exist.  I'm not one to knock tradition,
so I'll follow tradition and return 1 in these cases.  While I'm at
it, I'll also continue searching for four leaf clovers, kocking on
wood three times, and trying not to break mirrors.

Fixes: f365be092572 ("pinctrl: Add Qualcomm TLMM driver")
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/drivers/pinctrl/qcom/pinctrl-msm.c b/drivers/pinctrl/qcom/pinctrl-msm.c
index 0e22f52..2155a30 100644 (file)
--- a/drivers/pinctrl/qcom/pinctrl-msm.c
+++ b/drivers/pinctrl/qcom/pinctrl-msm.c
@@ -250,22 +250,30 @@ static int msm_config_group_get(struct pinctrl_dev *pctldev,
        /* Convert register value to pinconf value */
        switch (param) {
        case PIN_CONFIG_BIAS_DISABLE:
-               arg = arg == MSM_NO_PULL;
+               if (arg != MSM_NO_PULL)
+                       return -EINVAL;
+               arg = 1;
                break;
        case PIN_CONFIG_BIAS_PULL_DOWN:
-               arg = arg == MSM_PULL_DOWN;
+               if (arg != MSM_PULL_DOWN)
+                       return -EINVAL;
+               arg = 1;
                break;
        case PIN_CONFIG_BIAS_BUS_HOLD:
                if (pctrl->soc->pull_no_keeper)
                        return -ENOTSUPP;
 
-               arg = arg == MSM_KEEPER;
+               if (arg != MSM_KEEPER)
+                       return -EINVAL;
+               arg = 1;
                break;
        case PIN_CONFIG_BIAS_PULL_UP:
                if (pctrl->soc->pull_no_keeper)
                        arg = arg == MSM_PULL_UP_NO_KEEPER;
                else
                        arg = arg == MSM_PULL_UP;
+               if (!arg)
+                       return -EINVAL;
                break;
        case PIN_CONFIG_DRIVE_STRENGTH:
                arg = msm_regval_to_drive(arg);