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rtc: mxc: use a second rtc clock 

The mxc RTC needs two clocks, one for the input
reference, and one for the IP. But this driver
was only using one clock (for the reference).
This patch add the second clock (for the IP).

Acked-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Signed-off-by: Philippe Reynes <tremyfr@gmail.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
This commit is contained in:
Philippe Reynes 2015-07-26 23:37:50 +02:00 committed by Shawn Guo
parent def56bba7a
commit 8f5fe77828
1 changed files with 28 additions and 13 deletions
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41
drivers/rtc/rtc-mxc.c
View File

@ -79,7 +79,8 @@ struct rtc_plat_data {
struct rtc_device *rtc;
void __iomem *ioaddr;
int irq;
struct clk *clk;
struct clk *clk_ref;
struct clk *clk_ipg;
struct rtc_time g_rtc_alarm;
enum imx_rtc_type devtype;
};
@ -373,17 +374,28 @@ static int mxc_rtc_probe(struct platform_device *pdev)
if (IS_ERR(pdata->ioaddr))
return PTR_ERR(pdata->ioaddr);
pdata->clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(pdata->clk)) {
dev_err(&pdev->dev, "unable to get clock!\n");
return PTR_ERR(pdata->clk);
pdata->clk_ipg = devm_clk_get(&pdev->dev, "ipg");
if (IS_ERR(pdata->clk_ipg)) {
dev_err(&pdev->dev, "unable to get ipg clock!\n");
return PTR_ERR(pdata->clk_ipg);
}
ret = clk_prepare_enable(pdata->clk);
ret = clk_prepare_enable(pdata->clk_ipg);
if (ret)
return ret;
rate = clk_get_rate(pdata->clk);
pdata->clk_ref = devm_clk_get(&pdev->dev, "ref");
if (IS_ERR(pdata->clk_ref)) {
dev_err(&pdev->dev, "unable to get ref clock!\n");
ret = PTR_ERR(pdata->clk_ref);
goto exit_put_clk_ipg;
}
ret = clk_prepare_enable(pdata->clk_ref);
if (ret)
goto exit_put_clk_ipg;
rate = clk_get_rate(pdata->clk_ref);
if (rate == 32768)
reg = RTC_INPUT_CLK_32768HZ;
@ -394,7 +406,7 @@ static int mxc_rtc_probe(struct platform_device *pdev)
else {
dev_err(&pdev->dev, "rtc clock is not valid (%lu)\n", rate);
ret = -EINVAL;
goto exit_put_clk;
goto exit_put_clk_ref;
}
reg |= RTC_ENABLE_BIT;
@ -402,7 +414,7 @@ static int mxc_rtc_probe(struct platform_device *pdev)
if (((readw(pdata->ioaddr + RTC_RTCCTL)) & RTC_ENABLE_BIT) == 0) {
dev_err(&pdev->dev, "hardware module can't be enabled!\n");
ret = -EIO;
goto exit_put_clk;
goto exit_put_clk_ref;
}
platform_set_drvdata(pdev, pdata);
@ -424,15 +436,17 @@ static int mxc_rtc_probe(struct platform_device *pdev)
THIS_MODULE);
if (IS_ERR(rtc)) {
ret = PTR_ERR(rtc);
goto exit_put_clk;
goto exit_put_clk_ref;
}
pdata->rtc = rtc;
return 0;
exit_put_clk:
clk_disable_unprepare(pdata->clk);
exit_put_clk_ref:
clk_disable_unprepare(pdata->clk_ref);
exit_put_clk_ipg:
clk_disable_unprepare(pdata->clk_ipg);
return ret;
}
@ -441,7 +455,8 @@ static int mxc_rtc_remove(struct platform_device *pdev)
{
struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
clk_disable_unprepare(pdata->clk);
clk_disable_unprepare(pdata->clk_ref);
clk_disable_unprepare(pdata->clk_ipg);
return 0;
}