spi: atmel: adopt pinctrl support

Amend the spi atmel pin controller to optionally take a pin control
handle and set the state of the pins to:

- "default" on boot, resume and before performing an spitransfer
- "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>
Signed-off-by: Mark Brown <broonie@linaro.org>

1 files changed, 9 insertions, 0 deletions

diff --git a/drivers/spi/spi-atmel.c b/drivers/spi/spi-atmel.c
index 4804586edd29..c83b0c620fa1 100644
--- a/drivers/spi/spi-atmel.c
+++ b/drivers/spi/spi-atmel.c
@@ -26,6 +26,7 @@
 
 #include <linux/io.h>
 #include <linux/gpio.h>
+#include <linux/pinctrl/consumer.h>
 
 /* SPI register offsets */
 #define SPI_CR                                  0x0000
@@ -1292,6 +1293,9 @@ static int atmel_spi_probe(struct platform_device *pdev)
         struct spi_master       *master;
         struct atmel_spi        *as;
 
+        /* Select default pin state */
+        pinctrl_pm_select_default_state(&pdev->dev);
+
         regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
         if (!regs)
                 return -ENXIO;
@@ -1446,6 +1450,9 @@ static int atmel_spi_suspend(struct device *dev)
         struct atmel_spi        *as = spi_master_get_devdata(master);
 
         clk_disable_unprepare(as->clk);
+
+        pinctrl_pm_select_sleep_state(dev);
+
         return 0;
 }
 
@@ -1454,6 +1461,8 @@ static int atmel_spi_resume(struct device *dev)
         struct spi_master       *master = dev_get_drvdata(dev);
         struct atmel_spi        *as = spi_master_get_devdata(master);
 
+        pinctrl_pm_select_default_state(dev);
+
         clk_prepare_enable(as->clk);
         return 0;
 }