From mboxrd@z Thu Jan  1 00:00:00 1970
From: Philipp Zabel <p.zabel@pengutronix.de>
Subject: [PATCH v5 3/4] misc: sram: Add optional clock
Date: Thu, 18 Oct 2012 16:27:32 +0200
Message-ID: <1350570453-24546-4-git-send-email-p.zabel@pengutronix.de>
References: <1350570453-24546-1-git-send-email-p.zabel@pengutronix.de>
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In-Reply-To: <1350570453-24546-1-git-send-email-p.zabel@pengutronix.de>
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To: linux-kernel@vger.kernel.org, Arnd Bergmann <arnd@arndb.de>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Grant Likely <grant.likely@secretlab.ca>, Rob Herring <rob.herring@calxeda.com>, Paul Gortmaker <paul.gortmaker@windriver.com>, Shawn Guo <shawn.guo@linaro.org>, Richard Zhao <richard.zhao@freescale.com>, Huang Shijie <shijie8@gmail.com>, Dong Aisheng <dong.aisheng@linaro.org>, Matt Porter <mporter@ti.com>, kernel@pengutronix.de, devicetree-discuss@lists.ozlabs.org
Cc: Philipp Zabel <p.zabel@pengutronix.de>
List-Id: devicetree@vger.kernel.org

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

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.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