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H A D | gpio-rcar.c | diff 2d65472bcb3f2e1f305529655bb06054dc9e2804 Thu Dec 08 18:32:28 CET 2016 Geert Uytterhoeven <geert+renesas@glider.be> gpio: rcar: Fine-grained Runtime PM support
Currently gpio modules are runtime-resumed at probe time. This means the gpio module will be active all the time (except during system suspend, if not configured as a wake-up source).
While an R-Car Gen2 gpio module retains pins configured for output at the requested level while put in standby mode, gpio register cannot be accessed while suspended. Unfortunately pm_runtime_get_sync() cannot be called from all contexts where gpio register access is needed. Hence move the Runtime PM handling from probe/remove time to gpio request/free time, which is probably the best we can do.
On r8a7791/koelsch, gpio modules 0, 1, 3, and 4 are now suspended during normal use (gpio2 is used for LEDs and regulators, gpio5 for keys, gpio6 for SD-Card CD & WP, gpio7 for keys and regulators).
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> [Niklas: s/gpio_to_priv(chip)/gpiochip_get_data(chip)/] Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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