linux-kernel - Re: [PATCH 3/3] pinctrl: qcom: spmi-gpio: Fix pmic_gpio_config

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Date:   Mon, 02 Jul 2018 23:09:07 -0700
From:   Stephen Boyd <swboyd@...omium.org>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        Douglas Anderson <dianders@...omium.org>,
        Linus Walleij <linus.walleij@...aro.org>
Cc:     iivanov@...sol.com, Douglas Anderson <dianders@...omium.org>,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH 3/3] pinctrl: qcom: spmi-gpio: Fix pmic_gpio_config_get() to be
 compliant

Quoting Douglas Anderson (2018-07-02 15:59:39)
> If you do this on an sdm845 board:
>   grep "" /sys/kernel/debug/pinctrl/*spmi:pmic*/pinconf-groups
> 
> ...it looks like nonsense.  For every pin you see listed:
>   input bias disabled, input bias high impedance, input bias pull down, input bias pull up, ...
> 
> That's because pmic_gpio_config_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

Small typo here.

> wood three times, and trying not to break mirrors.
> 
> NOTE: This also fixes an apparent typo for reading
> PIN_CONFIG_BIAS_DISABLE where the old driver was accidentally
> using "=" instead of "==" and thus was setting some internal
> state when you tried to query PIN_CONFIG_BIAS_DISABLE.  Oops.

Awesome!

> 
> Fixes: eadff3024472 ("pinctrl: Qualcomm SPMI PMIC GPIO pin controller driver")
> Signed-off-by: Douglas Anderson <dianders@...omium.org>

We should fix the ssbi-gpio/mpp and spmi-mpp drivers too. All those
drivers are designed on the same buggy original driver.