linux-kernel - [PATCH 1/7] ARM: imx: add mmdc ipg clock operation for mmdc

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Date:   Fri, 31 Aug 2018 15:53:12 +0800
From:   Anson Huang <Anson.Huang@....com>
To:     shawnguo@...nel.org, s.hauer@...gutronix.de, kernel@...gutronix.de,
        fabio.estevam@....com, robh+dt@...nel.org, mark.rutland@....com,
        linux@...linux.org.uk, mturquette@...libre.com, sboyd@...nel.org,
        colin.didier@...ialet.com, clement.peron@...ialet.com,
        ping.bai@....com, aisheng.dong@....com, shengjiu.wang@....com,
        matteo.lisi@...icam.com, michael@...rulasolutions.com,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org
Cc:     Linux-imx@....com
Subject: [PATCH 1/7] ARM: imx: add mmdc ipg clock operation for mmdc

i.MX6 SoCs have MMDC ipg clock for registers access, to make
sure MMDC registers access successfully, add optional clock
enable for MMDC driver.

Signed-off-by: Anson Huang <Anson.Huang@....com>
---
 arch/arm/mach-imx/mmdc.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/arch/arm/mach-imx/mmdc.c b/arch/arm/mach-imx/mmdc.c
index 04b3bf7..e49e068 100644
--- a/arch/arm/mach-imx/mmdc.c
+++ b/arch/arm/mach-imx/mmdc.c
@@ -11,6 +11,7 @@
  * http://www.gnu.org/copyleft/gpl.html
  */
 
+#include <linux/clk.h>
 #include <linux/hrtimer.h>
 #include <linux/init.h>
 #include <linux/interrupt.h>
@@ -546,7 +547,20 @@ static int imx_mmdc_probe(struct platform_device *pdev)
 {
 	struct device_node *np = pdev->dev.of_node;
 	void __iomem *mmdc_base, *reg;
+	struct clk *mmdc_ipg_clk;
 	u32 val;
+	int err;
+
+	/* the ipg clock is optional */
+	mmdc_ipg_clk = devm_clk_get(&pdev->dev, NULL);
+	if (IS_ERR(mmdc_ipg_clk))
+		mmdc_ipg_clk = NULL;
+
+	err = clk_prepare_enable(mmdc_ipg_clk);
+	if (err) {
+		dev_err(&pdev->dev, "Unable to enable mmdc ipg clock.\n");
+		return err;
+	}
 
 	mmdc_base = of_iomap(np, 0);
 	WARN_ON(!mmdc_base);
-- 
2.7.4