On Thu, Sep 21, 2017 at 3:04 AM, Florian Fainelli [off-list ref] 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 <redacted>

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
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