linux-kernel - Re: [PATCH 12/14] arm64: dts: qcom: sc7180: Fix trogdor qspi pin config

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Date:   Sat, 8 Apr 2023 12:52:22 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Doug Anderson <dianders@...omium.org>
Cc:     Bjorn Andersson <andersson@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Mark Brown <broonie@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Matthias Kaehlcke <mka@...omium.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        linux-gpio@...r.kernel.org, Stephen Boyd <swboyd@...omium.org>,
        devicetree@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-spi@...r.kernel.org, Andy Gross <agross@...nel.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 12/14] arm64: dts: qcom: sc7180: Fix trogdor qspi pin
 config

On 07/04/2023 21:53, Doug Anderson wrote:
> Hi,
> 
> On Fri, Apr 7, 2023 at 11:11 AM Krzysztof Kozlowski
> <krzysztof.kozlowski@...aro.org> wrote:
>>
>> On 23/03/2023 18:30, Douglas Anderson wrote:
>>> In commit 7ec3e67307f8 ("arm64: dts: qcom: sc7180-trogdor: add initial
>>> trogdor and lazor dt") we specified the pull settings on the boot SPI
>>> (the qspi) data lines as pullups to "park" the lines. This seemed like
>>> the right thing to do, but I never really probed the lines to confirm.
>>>
>>
>>
>>>  &qup_i2c2_default {
>>> @@ -1336,6 +1340,22 @@ p_sensor_int_l: p-sensor-int-l-state {
>>>               bias-disable;
>>>       };
>>>
>>> +     qspi_sleep: qspi-sleep-state {
>>> +             pins = "gpio63", "gpio64", "gpio65", "gpio68";
>>> +
>>> +             /*
>>> +              * When we're not actively transferring we want pins as GPIOs
>>> +              * with output disabled so that the quad SPI IP block stops
>>> +              * driving them. We rely on the normal pulls configured in
>>> +              * the active state and don't redefine them here. Also note
>>> +              * that we don't need the reverse (output-enable) in the
>>> +              * normal mode since the "output-enable" only matters for
>>> +              * GPIO function.
>>> +              */
>>> +             function = "gpio";
>>> +             output-disable;
>>
>> Doug,
>>
>> I acked some of your patches, but I assumed you tested all this. It
>> turns out you never run dtbs_check on the patches you sent.
> 
> I'm fairly certain that I ran dtbs_check and confirmed that no new
> errors were introduced on the device tree files that this patch series
> cleaned up. Did I miss one?

You missed everything.
Before the patchset almost all pinctrl bindings were passing on arm64
DTS. Just one or two things to fix.

After the patchset: many new warnings.

>  I did not try to go through and fix all
> examples of people using "input-enable" across all Qualcomm device
> trees, though. 

You introduced new warnings, so it is expected to do.

> Those old device trees still work even if they're using
> the now-deprecated bindings. When deprecating something my
> understanding is that it's not required to go back and immediately
> transition all old device tree files.

You did not deprecate anything. You disallowed property causing many new
warnings to pop up.

> 
> If having the "input-enable: false" in the bindings is causing huge
> problems we could do a blank search-and-replace to rename it to
> "output-disable", at least for places under "tlmm". Even if there are
> cases where it's superfluous it would at least make the bindings
> validate.

There are different ways to fix it, the point is that none of the ways
were used.

I fixed it up:
https://lore.kernel.org/linux-arm-msm/574d3aa5-21f4-014a-8cc7-7549df59ff3c@linaro.org/

https://lore.kernel.org/linux-arm-msm/20230407180655.128771-1-krzysztof.kozlowski@linaro.org/

https://lore.kernel.org/linux-arm-msm/20230407180045.126952-1-krzysztof.kozlowski@linaro.org/

https://lore.kernel.org/linux-arm-msm/20230407175807.124394-1-krzysztof.kozlowski@linaro.org/


Best regards,
Krzysztof