spi: dw: Add basic runtime PM support (1e695983) · Commits · 戴 / test

Enable runtime PM so that the clock used to access the registers in the peripheral is turned on using a clock domain. Signed-off-by:

drivers/spi/spi-dw.c

+8 −0

Original line number	Diff line number	Diff line
		@@ -10,6 +10,7 @@
		#include <linux/module.h>
		#include <linux/highmem.h>
		#include <linux/delay.h>
		#include <linux/pm_runtime.h>
		#include <linux/slab.h>
		#include <linux/spi/spi.h>

		@@ -493,10 +494,13 @@ int dw_spi_add_host(struct device dev, struct dw_spi dws)
		master->dev.of_node = dev->of_node;
		master->dev.fwnode = dev->fwnode;
		master->flags = SPI_MASTER_GPIO_SS;
		master->auto_runtime_pm = true;

		if (dws->set_cs)
		master->set_cs = dws->set_cs;

		pm_runtime_enable(dev);

		/* Basic HW init */
		spi_hw_init(dev, dws);

		@@ -525,6 +529,7 @@ err_dma_exit:
		spi_enable_chip(dws, 0);
		free_irq(dws->irq, master);
		err_free_master:
		pm_runtime_disable(dev);
		spi_controller_put(master);
		return ret;
		}
		@@ -539,6 +544,9 @@ void dw_spi_remove_host(struct dw_spi *dws)

		spi_shutdown_chip(dws);

		if (dws->master)
		pm_runtime_disable(&dws->master->dev);

		free_irq(dws->irq, dws->master);
		}
		EXPORT_SYMBOL_GPL(dw_spi_remove_host);