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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@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
This commit is contained in:
Anson Huang 2018-08-31 15:53:12 +08:00 committed by Shawn Guo
parent 57361846b5
commit 9454a0caff
1 changed files with 14 additions and 0 deletions
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14
arch/arm/mach-imx/mmdc.c
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@ -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);