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mtd: spi-nor: cadence-quadspi: Add runtime PM support 

Add pm_runtime* calls to cadence-quadspi driver. This is required to
switch on QSPI power domain on TI 66AK2G SoC during probe.

Signed-off-by: Vignesh R <vigneshr@ti.com>
Acked-by: Marek Vasut <marek.vasut@gmail.com>
Signed-off-by: Cyrille Pitchen <cyrille.pitchen@wedev4u.fr>
This commit is contained in:
Vignesh R 2017-10-03 10:49:25 +05:30 committed by Cyrille Pitchen
parent 329864d35a
commit 4892b374c9
1 changed files with 15 additions and 1 deletions
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16
drivers/mtd/spi-nor/cadence-quadspi.c
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@ -31,6 +31,7 @@
#include <linux/of_device.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/sched.h>
#include <linux/spi/spi.h>
#include <linux/timer.h>
@ -1224,10 +1225,17 @@ static int cqspi_probe(struct platform_device *pdev)
return -ENXIO;
}
pm_runtime_enable(dev);
ret = pm_runtime_get_sync(dev);
if (ret < 0) {
pm_runtime_put_noidle(dev);
return ret;
}
ret = clk_prepare_enable(cqspi->clk);
if (ret) {
dev_err(dev, "Cannot enable QSPI clock.\n");
return ret;
goto probe_clk_failed;
}
cqspi->master_ref_clk_hz = clk_get_rate(cqspi->clk);
@ -1259,6 +1267,9 @@ probe_setup_failed:
cqspi_controller_enable(cqspi, 0);
probe_irq_failed:
clk_disable_unprepare(cqspi->clk);
probe_clk_failed:
pm_runtime_put_sync(dev);
pm_runtime_disable(dev);
return ret;
}
@ -1275,6 +1286,9 @@ static int cqspi_remove(struct platform_device *pdev)
clk_disable_unprepare(cqspi->clk);
pm_runtime_put_sync(&pdev->dev);
pm_runtime_disable(&pdev->dev);
return 0;
}