diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/spi/spi-cadence.c | 70 |
1 files changed, 68 insertions, 2 deletions
diff --git a/drivers/spi/spi-cadence.c b/drivers/spi/spi-cadence.c index 8a6fee934364..3b94063b2823 100644 --- a/drivers/spi/spi-cadence.c +++ b/drivers/spi/spi-cadence.c @@ -19,6 +19,7 @@ #include <linux/of_irq.h> #include <linux/of_address.h> #include <linux/platform_device.h> +#include <linux/pm_runtime.h> #include <linux/spi/spi.h> /* Name of this driver */ @@ -37,6 +38,7 @@ #define CDNS_SPI_SICR 0x24 /* Slave Idle Count Register, RW */ #define CDNS_SPI_THLD 0x28 /* Transmit FIFO Watermark Register,RW */ +#define SPI_AUTOSUSPEND_TIMEOUT 3000 /* * SPI Configuration Register bit Masks * @@ -509,6 +511,11 @@ static int cdns_spi_probe(struct platform_device *pdev) goto clk_dis_apb; } + pm_runtime_enable(&pdev->dev); + pm_runtime_use_autosuspend(&pdev->dev); + pm_runtime_set_autosuspend_delay(&pdev->dev, SPI_AUTOSUSPEND_TIMEOUT); + pm_runtime_set_active(&pdev->dev); + ret = of_property_read_u32(pdev->dev.of_node, "num-cs", &num_cs); if (ret < 0) master->num_chipselect = CDNS_SPI_DEFAULT_NUM_CS; @@ -523,6 +530,9 @@ static int cdns_spi_probe(struct platform_device *pdev) /* SPI controller initializations */ cdns_spi_init_hw(xspi); + pm_runtime_mark_last_busy(&pdev->dev); + pm_runtime_put_autosuspend(&pdev->dev); + irq = platform_get_irq(pdev, 0); if (irq <= 0) { ret = -ENXIO; @@ -543,6 +553,7 @@ static int cdns_spi_probe(struct platform_device *pdev) master->transfer_one = cdns_transfer_one; master->unprepare_transfer_hardware = cdns_unprepare_transfer_hardware; master->set_cs = cdns_spi_chipselect; + master->auto_runtime_pm = true; master->mode_bits = SPI_CPOL | SPI_CPHA; /* Set to default valid value */ @@ -560,6 +571,8 @@ static int cdns_spi_probe(struct platform_device *pdev) return ret; clk_dis_all: + pm_runtime_set_suspended(&pdev->dev); + pm_runtime_disable(&pdev->dev); clk_disable_unprepare(xspi->ref_clk); clk_dis_apb: clk_disable_unprepare(xspi->pclk); @@ -587,6 +600,8 @@ static int cdns_spi_remove(struct platform_device *pdev) clk_disable_unprepare(xspi->ref_clk); clk_disable_unprepare(xspi->pclk); + pm_runtime_set_suspended(&pdev->dev); + pm_runtime_disable(&pdev->dev); spi_unregister_master(master); @@ -649,8 +664,59 @@ static int __maybe_unused cdns_spi_resume(struct device *dev) return 0; } -static SIMPLE_DEV_PM_OPS(cdns_spi_dev_pm_ops, cdns_spi_suspend, - cdns_spi_resume); +/** + * cdns_spi_runtime_resume - Runtime resume method for the SPI driver + * @dev: Address of the platform_device structure + * + * This function enables the clocks + * + * Return: 0 on success and error value on error + */ +static int cnds_runtime_resume(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct cdns_spi *xspi = spi_master_get_devdata(master); + int ret; + + ret = clk_prepare_enable(xspi->pclk); + if (ret) { + dev_err(dev, "Cannot enable APB clock.\n"); + return ret; + } + + ret = clk_prepare_enable(xspi->ref_clk); + if (ret) { + dev_err(dev, "Cannot enable device clock.\n"); + clk_disable(xspi->pclk); + return ret; + } + return 0; +} + +/** + * cdns_spi_runtime_suspend - Runtime suspend method for the SPI driver + * @dev: Address of the platform_device structure + * + * This function disables the clocks + * + * Return: Always 0 + */ +static int cnds_runtime_suspend(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct cdns_spi *xspi = spi_master_get_devdata(master); + + clk_disable_unprepare(xspi->ref_clk); + clk_disable_unprepare(xspi->pclk); + + return 0; +} + +static const struct dev_pm_ops cdns_spi_dev_pm_ops = { + SET_RUNTIME_PM_OPS(cnds_runtime_suspend, + cnds_runtime_resume, NULL) + SET_SYSTEM_SLEEP_PM_OPS(cdns_spi_suspend, cdns_spi_resume) +}; static const struct of_device_id cdns_spi_of_match[] = { { .compatible = "xlnx,zynq-spi-r1p6" }, |