linux-kernel - [PATCH v5 3/4] misc: sram: Add optional clock

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Message-Id: <1350570453-24546-4-git-send-email-p.zabel@pengutronix.de>
Date:	Thu, 18 Oct 2012 16:27:32 +0200
From:	Philipp Zabel <p.zabel@...gutronix.de>
To:	linux-kernel@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <rob.herring@...xeda.com>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Shawn Guo <shawn.guo@...aro.org>,
	Richard Zhao <richard.zhao@...escale.com>,
	Huang Shijie <shijie8@...il.com>,
	Dong Aisheng <dong.aisheng@...aro.org>,
	Matt Porter <mporter@...com>, kernel@...gutronix.de,
	devicetree-discuss@...ts.ozlabs.org
Cc:	Philipp Zabel <p.zabel@...gutronix.de>
Subject: [PATCH v5 3/4] misc: sram: Add optional clock

On some platforms the SRAM needs a clock to be enabled explicitly.

Signed-off-by: Philipp Zabel <p.zabel@...gutronix.de>
---
 drivers/misc/sram.c |   10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/misc/sram.c b/drivers/misc/sram.c
index 7a363f2..0cc2e75 100644
--- a/drivers/misc/sram.c
+++ b/drivers/misc/sram.c
@@ -21,6 +21,8 @@
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/init.h>
+#include <linux/clk.h>
+#include <linux/err.h>
 #include <linux/io.h>
 #include <linux/of.h>
 #include <linux/platform_device.h>
@@ -29,6 +31,7 @@
 
 struct sram_dev {
 	struct gen_pool *pool;
+	struct clk *clk;
 };
 
 static int __devinit sram_probe(struct platform_device *pdev)
@@ -53,6 +56,10 @@ static int __devinit sram_probe(struct platform_device *pdev)
 	if (!sram)
 		return -ENOMEM;
 
+	sram->clk = devm_clk_get(&pdev->dev, NULL);
+	if (!IS_ERR(sram->clk))
+		clk_prepare_enable(sram->clk);
+
 	sram->pool = gen_pool_create(PAGE_SHIFT, -1);
 	if (!sram->pool)
 		return -ENOMEM;
@@ -80,6 +87,9 @@ static int __devexit sram_remove(struct platform_device *pdev)
 
 	gen_pool_destroy(sram->pool);
 
+	if (!IS_ERR(sram->clk))
+		clk_disable_unprepare(sram->clk);
+
 	return 0;
 }
 
-- 
1.7.10.4

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