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spi: dw: Add basic runtime PM support

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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: Phil Edworthy <phil.edworthy@renesas.com>
Signed-off-by: Gareth Williams <gareth.williams.jx@renesas.com>
Link: https://lore.kernel.org/r/1568793876-9009-4-git-send-email-gareth.williams.jx@renesas.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Phil Edworthy 2019-09-18 09:04:35 +01:00 committed by Mark Brown
parent 47cf13bc76
commit 1e69598325
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GPG key ID: 24D68B725D5487D0
1 changed files with 8 additions and 0 deletions
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8
drivers/spi/spi-dw.c
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@ -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 @@ int dw_spi_add_host(struct device *dev, struct dw_spi *dws)
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);