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ARM: 7832/1: mmc: mmci: Use optional sleep pinctrl state

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By optionally putting the pins into sleep state in the .runtime_suspend
callback we can accomplish two things. One is to minimize current leakage
from pins and thus save power, second we can prevent the IP from driving
pins output in an uncontrolled manner, which may happen if the power domain
drops the domain regulator.

When returning from idle, entering .runtime_resume callback, the pins
are restored to default state.

Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Acked-by: Rickard Andersson <rickard.andersson@stericsson.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Ulf Hansson 2013-09-04 09:00:37 +01:00 committed by Russell King
parent edaf6d3d26
commit e36bd9c6c9
1 changed files with 2 additions and 0 deletions
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2
drivers/mmc/host/mmci.c
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@ -1750,6 +1750,7 @@ static int mmci_runtime_suspend(struct device *dev)
if (mmc) {
struct mmci_host *host = mmc_priv(mmc);
pinctrl_pm_select_sleep_state(dev);
clk_disable_unprepare(host->clk);
}
@ -1764,6 +1765,7 @@ static int mmci_runtime_resume(struct device *dev)
if (mmc) {
struct mmci_host *host = mmc_priv(mmc);
clk_prepare_enable(host->clk);
pinctrl_pm_select_default_state(dev);
}
return 0;