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Subject[PATCH v4] i2c/at91: adopt pinctrl support
Date
Amend the at91 i2c pin controller to optionally take a pin control
handle and set the state of the pins to:
- "default" on boot and resume.
- "sleep" on suspend().

This should make it possible to optimize energy usage for the pins
both for the suspend/resume cycle

Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com>
---
Hi Wolfram,

Thanks a lot.

The change of this version is to remove
pinctrl_pm_select_default_state(&pdev->dev) from the _probe function.

Best Regards,
Wenyou Yang

drivers/i2c/busses/i2c-at91.c | 5 +++++
1 file changed, 5 insertions(+)

diff --git a/drivers/i2c/busses/i2c-at91.c b/drivers/i2c/busses/i2c-at91.c
index 7c335f4..77fb647 100644
--- a/drivers/i2c/busses/i2c-at91.c
+++ b/drivers/i2c/busses/i2c-at91.c
@@ -32,6 +32,7 @@
#include <linux/slab.h>
#include <linux/platform_data/dma-atmel.h>
#include <linux/pm_runtime.h>
+#include <linux/pinctrl/consumer.h>

#define DEFAULT_TWI_CLK_HZ 100000 /* max 400 Kbits/s */
#define AT91_I2C_TIMEOUT msecs_to_jiffies(100) /* transfer timeout */
@@ -851,6 +852,8 @@ static int at91_twi_runtime_suspend(struct device *dev)

clk_disable_unprepare(twi_dev->clk);

+ pinctrl_pm_select_sleep_state(dev);
+
return 0;
}

@@ -858,6 +861,8 @@ static int at91_twi_runtime_resume(struct device *dev)
{
struct at91_twi_dev *twi_dev = dev_get_drvdata(dev);

+ pinctrl_pm_select_default_state(dev);
+
return clk_prepare_enable(twi_dev->clk);
}

--
1.7.9.5


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