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>
diff --git a/drivers/spi/spi-atmel.c b/drivers/spi/spi-atmel.c
index 4804586..c83b0c6 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 @@
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 @@
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 @@
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;
}