From mboxrd@z Thu Jan 1 00:00:00 1970 From: Wenyou Yang Subject: [PATCH 2/3] i2c/at91: add support for system PM Date: Mon, 20 Oct 2014 11:42:13 +0800 Message-ID: <1413776535-10123-3-git-send-email-wenyou.yang@atmel.com> References: <1413776535-10123-1-git-send-email-wenyou.yang@atmel.com> Mime-Version: 1.0 Content-Type: text/plain Return-path: In-Reply-To: <1413776535-10123-1-git-send-email-wenyou.yang-AIFe0yeh4nAAvxtiuMwx3w@public.gmane.org> Sender: linux-i2c-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: wsa-z923LK4zBo2bacvFa/9K2g@public.gmane.org, ludovic.desroches-AIFe0yeh4nAAvxtiuMwx3w@public.gmane.org Cc: linux-i2c-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, nicolas.ferre-AIFe0yeh4nAAvxtiuMwx3w@public.gmane.org, linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, wenyou.yang-AIFe0yeh4nAAvxtiuMwx3w@public.gmane.org List-Id: linux-i2c@vger.kernel.org Signed-off-by: Wenyou Yang --- drivers/i2c/busses/i2c-at91.c | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) diff --git a/drivers/i2c/busses/i2c-at91.c b/drivers/i2c/busses/i2c-at91.c index 03b9f48..8f408f8 100644 --- a/drivers/i2c/busses/i2c-at91.c +++ b/drivers/i2c/busses/i2c-at91.c @@ -845,6 +845,35 @@ static int at91_twi_remove(struct platform_device *pdev) } #ifdef CONFIG_PM +#ifdef CONFIG_PM_SLEEP +static int at91_twi_suspend(struct device *dev) +{ + struct at91_twi_dev *twi_dev = dev_get_drvdata(dev); + + if (!pm_runtime_suspended(dev)) + clk_disable_unprepare(twi_dev->clk); + + return 0; +} + +static int at91_twi_resume(struct device *dev) +{ + struct at91_twi_dev *twi_dev = dev_get_drvdata(dev); + int ret; + + if (!pm_runtime_suspended(dev)) { + ret = clk_prepare_enable(twi_dev->clk); + if (ret) + return ret; + } + + pm_runtime_mark_last_busy(dev); + pm_request_autosuspend(dev); + + return 0; +} +#endif + #ifdef CONFIG_PM_RUNTIME static int at91_twi_runtime_suspend(struct device *dev) { @@ -864,6 +893,7 @@ static int at91_twi_runtime_resume(struct device *dev) #endif static const struct dev_pm_ops at91_twi_pm = { + SET_SYSTEM_SLEEP_PM_OPS(at91_twi_suspend, at91_twi_resume) SET_RUNTIME_PM_OPS(at91_twi_runtime_suspend, at91_twi_runtime_resume, NULL) }; -- 1.7.9.5