linux-kernel - Re: [PATCH] gpio: mxc: add power management support

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Message-ID: <CAOMZO5DCsdwXK0eftcpwzT4my30HZLR7-H2c+V=ro+_fOMAWCw@mail.gmail.com>
Date:   Sat, 14 Jul 2018 13:13:02 -0300
From:   Fabio Estevam <festevam@...il.com>
To:     Anson Huang <anson.huang@....com>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        dl-linux-imx <linux-imx@....com>
Subject: Re: [PATCH] gpio: mxc: add power management support

Hi Anson,

On Fri, Jul 13, 2018 at 10:53 PM, Anson Huang <anson.huang@....com> wrote:

> Here are the details, i.MX7D LPSR mode and i.MX8QM/8QXP etc.' suspend/resume
> may cause GPIO bank lose power, so need to save/restore, for other i.MX SoCs,
> although no need to do save/restore, but doing it is NOT harmful, so do you think
> we should add SoC type check here?

I think it would be safer to restrict the save/restore operations to mx7/mx8.

You can add a fsl,imx7d-gpio compatible entry in the driver.

Thanks