linux-kernel - Re: [RFT PATCH 2/2] pinctrl: spmi-mpp: Fix pmic_mpp_config

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Date:   Thu, 30 Aug 2018 18:00:16 -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:     "Ivan T . Ivanov" <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: [RFT PATCH 2/2] pinctrl: spmi-mpp: Fix pmic_mpp_config_get() to be
 compliant

Quoting Douglas Anderson (2018-08-30 08:23:39)
> If you look at "pinconf-groups" in debugfs for ssbi-mpp you'll notice
> it looks like nonsense.
> 
> The problem is fairly well described in commit 1cf86bc21257 ("pinctrl:
> qcom: spmi-gpio: Fix pmic_gpio_config_get() to be compliant") and
> commit 05e0c828955c ("pinctrl: msm: Fix msm_config_group_get() to be
> compliant"), but it was pointed out that ssbi-mpp has the same
> problem.  Let's fix it there too.
> 
> NOTE: in case it's helpful to someone reading this, the way to tell
> whether to do the -EINVAL or not is to look at the PCONFDUMP for a
> given attribute.  If the last element (has_arg) is false then you need
> to do the -EINVAL trick.
> 
> ALSO NOTE: it seems unlikely that the values returned when we try to
> get PIN_CONFIG_BIAS_PULL_UP will actually be printed since "has_arg"
> is false for that one, but I guess it's still fine to return different
> values so I kept doing that.  It seems like another driver (ssbi-gpio)
> uses a custom attribute (PM8XXX_QCOM_PULL_UP_STRENGTH) for something
> similar so maybe a future change should do that here too.
> 
> Fixes: cfb24f6ebd38 ("pinctrl: Qualcomm SPMI PMIC MPP pin controller driver")
> Signed-off-by: Douglas Anderson <dianders@...omium.org>
> ---

Reviewed-by: Stephen Boyd <sboyd@...nel.org>