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rtc: gemini: Add optional clock handling 

This makes the Gemini optionally take two clock references to
the PCLK and EXTCLK. As we are adding a clock framework to the
Gemini platform we need to make sure that we get the right
references.

Acked-by: Hans Ulli Kroll <ulli.kroll@googlemail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
hifive-unleashed-5.1
Linus Walleij 2017-05-30 09:53:30 +02:00 committed by Alexandre Belloni
parent e48585dec2
commit ac05fba39c
1 changed files with 28 additions and 0 deletions
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28
drivers/rtc/rtc-gemini.c
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@ -26,6 +26,7 @@
#include <linux/platform_device.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/clk.h>
#define DRV_NAME "rtc-gemini"
@ -38,6 +39,8 @@ struct gemini_rtc {
struct rtc_device *rtc_dev;
void __iomem *rtc_base;
int rtc_irq;
struct clk *pclk;
struct clk *extclk;
};
enum gemini_rtc_offsets {
@ -127,6 +130,27 @@ static int gemini_rtc_probe(struct platform_device *pdev)
return -ENOMEM;
platform_set_drvdata(pdev, rtc);
rtc->pclk = devm_clk_get(dev, "PCLK");
if (IS_ERR(rtc->pclk)) {
dev_err(dev, "could not get PCLK\n");
} else {
ret = clk_prepare_enable(rtc->pclk);
if (ret) {
dev_err(dev, "failed to enable PCLK\n");
return ret;
}
}
rtc->extclk = devm_clk_get(dev, "EXTCLK");
if (IS_ERR(rtc->extclk)) {
dev_err(dev, "could not get EXTCLK\n");
} else {
ret = clk_prepare_enable(rtc->extclk);
if (ret) {
dev_err(dev, "failed to enable EXTCLK\n");
return ret;
}
}
res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
if (!res)
return -ENODEV;
@ -156,6 +180,10 @@ static int gemini_rtc_remove(struct platform_device *pdev)
{
struct gemini_rtc *rtc = platform_get_drvdata(pdev);
if (!IS_ERR(rtc->extclk))
clk_disable_unprepare(rtc->extclk);
if (!IS_ERR(rtc->pclk))
clk_disable_unprepare(rtc->pclk);
rtc_device_unregister(rtc->rtc_dev);
return 0;