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@@ -14,6 +14,7 @@
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#include <linux/platform_device.h>
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#include <linux/of.h>
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#include <linux/delay.h>
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+#include <linux/clk.h>
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#include <linux/gfp.h>
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#include <linux/module.h>
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@@ -41,6 +42,7 @@ struct rtc_plat_data {
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struct rtc_device *rtc;
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void __iomem *ioaddr;
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int irq;
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+ struct clk *clk;
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};
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static int mv_rtc_set_time(struct device *dev, struct rtc_time *tm)
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@@ -221,6 +223,7 @@ static int mv_rtc_probe(struct platform_device *pdev)
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struct rtc_plat_data *pdata;
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resource_size_t size;
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u32 rtc_time;
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+ int ret = 0;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!res)
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@@ -239,11 +242,17 @@ static int mv_rtc_probe(struct platform_device *pdev)
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if (!pdata->ioaddr)
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return -ENOMEM;
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+ pdata->clk = devm_clk_get(&pdev->dev, NULL);
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+ /* Not all SoCs require a clock.*/
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+ if (!IS_ERR(pdata->clk))
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+ clk_prepare_enable(pdata->clk);
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+
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/* make sure the 24 hours mode is enabled */
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rtc_time = readl(pdata->ioaddr + RTC_TIME_REG_OFFS);
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if (rtc_time & RTC_HOURS_12H_MODE) {
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dev_err(&pdev->dev, "24 Hours mode not supported.\n");
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- return -EINVAL;
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+ ret = -EINVAL;
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+ goto out;
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}
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/* make sure it is actually functional */
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@@ -252,7 +261,8 @@ static int mv_rtc_probe(struct platform_device *pdev)
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rtc_time = readl(pdata->ioaddr + RTC_TIME_REG_OFFS);
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if (rtc_time == 0x01000000) {
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dev_err(&pdev->dev, "internal RTC not ticking\n");
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- return -ENODEV;
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+ ret = -ENODEV;
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+ goto out;
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}
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}
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@@ -268,8 +278,10 @@ static int mv_rtc_probe(struct platform_device *pdev)
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} else
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pdata->rtc = rtc_device_register(pdev->name, &pdev->dev,
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&mv_rtc_ops, THIS_MODULE);
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- if (IS_ERR(pdata->rtc))
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- return PTR_ERR(pdata->rtc);
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+ if (IS_ERR(pdata->rtc)) {
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+ ret = PTR_ERR(pdata->rtc);
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+ goto out;
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+ }
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if (pdata->irq >= 0) {
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writel(0, pdata->ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);
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@@ -282,6 +294,11 @@ static int mv_rtc_probe(struct platform_device *pdev)
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}
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return 0;
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+out:
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+ if (!IS_ERR(pdata->clk))
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+ clk_disable_unprepare(pdata->clk);
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+
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+ return ret;
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}
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static int __exit mv_rtc_remove(struct platform_device *pdev)
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@@ -292,6 +309,9 @@ static int __exit mv_rtc_remove(struct platform_device *pdev)
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device_init_wakeup(&pdev->dev, 0);
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rtc_device_unregister(pdata->rtc);
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+ if (!IS_ERR(pdata->clk))
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+ clk_disable_unprepare(pdata->clk);
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+
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return 0;
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}
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