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 <[email protected]> --- drivers/spi/spi-atmel.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/drivers/spi/spi-atmel.c b/drivers/spi/spi-atmel.c index b0842f7..54b4436 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 @@ -1303,6 +1304,9 @@ 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; @@ -1457,6 +1461,9 @@ 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; } @@ -1465,6 +1472,8 @@ 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; } -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
