linux-kernel - [PATCH 2/3] spi: dw: Add basic runtime PM support

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Message-Id: <1568376720-7402-3-git-send-email-gareth.williams.jx@renesas.com>
Date:   Fri, 13 Sep 2019 13:11:59 +0100
From:   Gareth Williams <gareth.williams.jx@...esas.com>
To:     Mark Brown <broonie@...nel.org>
Cc:     Phil Edworthy <phil.edworthy@...esas.com>,
        linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org,
        Gareth Williams <gareth.williams.jx@...esas.com>
Subject: [PATCH 2/3] spi: dw: Add basic runtime PM support

From: Phil Edworthy <phil.edworthy@...esas.com>

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@...esas.com>
Signed-off-by: Gareth Williams <gareth.williams.jx@...esas.com>
---
 drivers/spi/spi-dw.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/spi/spi-dw.c b/drivers/spi/spi-dw.c
index 9a49e07..593bbb0 100644
--- a/drivers/spi/spi-dw.c
+++ b/drivers/spi/spi-dw.c
@@ -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>
 
@@ -497,6 +498,9 @@ int dw_spi_add_host(struct device *dev, struct dw_spi *dws)
 	if (dws->set_cs)
 		master->set_cs = dws->set_cs;
 
+	pm_runtime_enable(dev);
+	pm_runtime_get_sync(dev);
+
 	/* Basic HW init */
 	spi_hw_init(dev, dws);
 
-- 
2.7.4