From: Wenyou Yang <wenyou.yang@atmel.com>
To: <wsa@the-dreams.de>, <ludovic.desroches@atmel.com>
Cc: <linux-i2c@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
<nicolas.ferre@atmel.com>, <linux-arm-kernel@lists.infradead.org>,
<wenyou.yang@atmel.com>
Subject: [PATCH 2/3] i2c/at91: add support for system PM
Date: Mon, 20 Oct 2014 11:42:13 +0800 [thread overview]
Message-ID: <1413776535-10123-3-git-send-email-wenyou.yang@atmel.com> (raw)
In-Reply-To: <1413776535-10123-1-git-send-email-wenyou.yang@atmel.com>
Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com>
---
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
next prev parent reply other threads:[~2014-10-20 3:49 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-20 3:42 [PATCH 0/3] i2c/at91: add support PM functions Wenyou Yang
2014-10-20 3:42 ` [PATCH 1/3] i2c/at91: add support for runtime PM Wenyou Yang
2014-10-20 12:39 ` Ludovic Desroches
2014-10-20 13:14 ` Ludovic Desroches
2014-10-21 0:56 ` Yang, Wenyou
2014-10-20 3:42 ` Wenyou Yang [this message]
2014-10-20 12:42 ` [PATCH 2/3] i2c/at91: add support for system PM Ludovic Desroches
2014-10-20 13:15 ` Ludovic Desroches
2014-10-20 18:15 ` Kevin Hilman
2014-10-21 1:25 ` Yang, Wenyou
2014-10-20 3:42 ` [PATCH 3/3] i2c/at91: adopt pinctrl support Wenyou Yang
2014-10-20 12:43 ` Ludovic Desroches
2014-10-20 18:17 ` Kevin Hilman
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