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Subject: Re: [PATCH V5 02/18] pinctrl: tegra: Add suspend and resume support
To:     Dmitry Osipenko <digetx@gmail.com>,
        Linus Walleij <linus.walleij@linaro.org>
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From:   Sowjanya Komatineni <skomatineni@nvidia.com>
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On 7/4/19 3:40 AM, Dmitry Osipenko wrote:
> 04.07.2019 10:31, Linus Walleij =D0=BF=D0=B8=D1=88=D0=B5=D1=82:
>> On Sat, Jun 29, 2019 at 5:58 PM Dmitry Osipenko <digetx@gmail.com> wrote=
:
>>
>>> Oh, also what about GPIO-pinctrl suspend resume ordering .. is it okay =
that pinctrl
>>> will be resumed after GPIO? Shouldn't a proper pin-muxing be selected a=
t first?
>> Thierry sent some initial patches about this I think. We need to use
>> device links for this to work properly so he adds support for
>> linking the pinctrl and GPIO devices through the ranges.
>>
>> For links between pin control handles and their consumers, see also:
>> 036f394dd77f pinctrl: Enable device link creation for pin control
>> c6045b4e3cad pinctrl: stmfx: enable links creations
>> 489b64d66325 pinctrl: stm32: Add links to consumers
>>
>> I am using STM32 as guinea pig for this, consider adding links also
>> from the Tegra pinctrl. I might simply make these pinctrl consumer
>> to producer links default because I think it makes a lot sense.
> IIUC, currently the plan is to resume pinctrl *after* GPIO for Tegra210 [=
1]. But this
> contradicts to what was traditionally done for older Tegras where pinctrl=
 was always
> resumed first and apparently it won't work well for the GPIO ranges as we=
ll. I think this
> and the other patchsets related to suspend-resume still need some more th=
ought.
>
> [1] https://patchwork.kernel.org/patch/11012077/

Park bit was introduced from Tegra210 onwards and during suspend/resume,=20
requirement of gpio restore prior to pinctrl restore is not required for=20
prior Tegra210.

Also currently pinctrl suspend/resume implementation for prior Tegra210=20
is not yet upstreamed but having gpio restore prior to pinmux during=20
suspend/resume should not cause any issue for prior tegra's as well as=20
gpio resume restores pins back to same gpio config as they were during=20
suspend entry.