Re: [PATCH 2/2] pinctrl: single: Allow indicating loss of pin states during low-power

From	Linus Walleij <linus.walleij@linaro.org>
Newsgroups	linux.kernel
Subject	Re: [PATCH 2/2] pinctrl: single: Allow indicating loss of pin states during low-power
Date	2017-09-22 15:10 +0200
Message-ID	<usvSq-6uj-17@gated-at.bofh.it> (permalink)
References	<urYa5-2kx-9@gated-at.bofh.it> <urYa6-2kx-15@gated-at.bofh.it>
Organization	linux.* mail to news gateway

Show all headers | View raw

On Thu, Sep 21, 2017 at 3:04 AM, Florian Fainelli <f.fainelli@gmail.com> wrote:

> Some platforms (e.g: Broadcom STB: BMIPS_GENERIC/ARCH_BRCMSTB) will lose
> their register contents when entering their lower power state. In such a
> case, the pinctrl-single driver that is used will not be able to restore
> the power states without telling the core about it and having
> pinctrl_select_state() check for that.
>
> This patch adds a new optional boolean property that Device Tree can
> define in order to obtain exactly that and having the core pinctrl code
> take that into account.
>
> Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>

If we use this per-controller approach rather than the per-state approach
I discuss in reply to patch 1/2, we should probably make it a generic
property for pin controllers and not just a pinctrl-single business.

So patch pinctrl-bindings.txt and put the code somewhere in
core.

But that is more of a detail, first we need to figure out how to
handle this business in general.

Yours,
Linus Walleij

Thread

[PATCH 2/2] pinctrl: single: Allow indicating loss of pin states during low-power Florian Fainelli <f.fainelli@gmail.com> - 2017-09-21 03:10 +0200
  Re: [PATCH 2/2] pinctrl: single: Allow indicating loss of pin states  during low-power Linus Walleij <linus.walleij@linaro.org> - 2017-09-22 15:10 +0200
    Re: [PATCH 2/2] pinctrl: single: Allow indicating loss of pin states  during low-power Florian Fainelli <f.fainelli@gmail.com> - 2017-09-25 21:20 +0200

csiph-web