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.faine...@gmail.com> --- Documentation/devicetree/bindings/pinctrl/pinctrl-single.txt | 4 ++++ drivers/pinctrl/pinctrl-single.c | 3 +++ 2 files changed, 7 insertions(+) diff --git a/Documentation/devicetree/bindings/pinctrl/pinctrl-single.txt b/Documentation/devicetree/bindings/pinctrl/pinctrl-single.txt index e705acd3612c..e71967f6a1a7 100644 --- a/Documentation/devicetree/bindings/pinctrl/pinctrl-single.txt +++ b/Documentation/devicetree/bindings/pinctrl/pinctrl-single.txt @@ -82,6 +82,10 @@ Optional properties: /* pin base, nr pins & gpio function */ pinctrl-single,gpio-range = <&range 0 3 0 &range 3 9 1>; +- pinctrl-single,low-power-state-loss : indicates that the pins lose their + state during low power modes and therefore need to be restored upon + system resumption. + - interrupt-controller : standard interrupt controller binding if using interrupts for wake-up events for example. In this case pinctrl-single is set up as a chained interrupt controller and the wake-up interrupts diff --git a/drivers/pinctrl/pinctrl-single.c b/drivers/pinctrl/pinctrl-single.c index b8b3d932cd73..d69d20b8247a 100644 --- a/drivers/pinctrl/pinctrl-single.c +++ b/drivers/pinctrl/pinctrl-single.c @@ -1749,6 +1749,9 @@ static int pcs_probe(struct platform_device *pdev) goto free; } + if (of_property_read_bool(np, "pinctrl-single,low-power-state-loss")) + pcs->pctl->flags |= PINCTRL_FLG_FORCE_STATE; + ret = pcs_add_gpio_func(np, pcs); if (ret < 0) goto free; -- 2.14.1