[PATCH v2 9/9] rtc: Add support for the MediaTek MT6358 RTC

[Hsin-Hsiung Wang]

From: Ran Bi <ran...@mediatek.com>

This add support for the MediaTek MT6358 RTC. MT6397 mfd will pass
RTC_WRTGR address offset to RTC driver.

Signed-off-by: Ran Bi <ran...@mediatek.com>
---
 drivers/rtc/rtc-mt6397.c | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/drivers/rtc/rtc-mt6397.c b/drivers/rtc/rtc-mt6397.c
index f85f1fc..c8a0090 100644
--- a/drivers/rtc/rtc-mt6397.c
+++ b/drivers/rtc/rtc-mt6397.c
@@ -27,7 +27,7 @@
 #define RTC_BBPU               0x0000
 #define RTC_BBPU_CBUSY         BIT(6)
 
-#define RTC_WRTGR              0x003c
+#define RTC_WRTGR_DEFAULT      0x003c
 
 #define RTC_IRQ_STA            0x0002
 #define RTC_IRQ_STA_AL         BIT(0)
@@ -78,6 +78,7 @@ struct mt6397_rtc {
        struct regmap           *regmap;
        int                     irq;
        u32                     addr_base;
+       u32                     wrtgr_offset;
 };
 
 static int mtk_rtc_write_trigger(struct mt6397_rtc *rtc)
@@ -86,7 +87,8 @@ static int mtk_rtc_write_trigger(struct mt6397_rtc *rtc)
        int ret;
        u32 data;
 
-       ret = regmap_write(rtc->regmap, rtc->addr_base + RTC_WRTGR, 1);
+       ret = regmap_write(rtc->regmap,
+                          rtc->addr_base + rtc->wrtgr_offset, 1);
        if (ret < 0)
                return ret;
 
@@ -341,6 +343,15 @@ static int mtk_rtc_probe(struct platform_device *pdev)
        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
        rtc->addr_base = res->start;
 
+       res = platform_get_resource(pdev, IORESOURCE_REG, 0);
+       if (res) {
+               rtc->wrtgr_offset = res->start;
+               dev_info(&pdev->dev, "register offset:%d\n", rtc->wrtgr_offset);
+       } else {
+               rtc->wrtgr_offset = RTC_WRTGR_DEFAULT;
+               dev_err(&pdev->dev, "Failed to get register offset\n");
+       }
+
        rtc->irq = platform_get_irq(pdev, 0);
        if (rtc->irq < 0)
                return rtc->irq;
@@ -420,6 +431,7 @@ static SIMPLE_DEV_PM_OPS(mt6397_pm_ops, mt6397_rtc_suspend,
                        mt6397_rtc_resume);
 
 static const struct of_device_id mt6397_rtc_of_match[] = {
+       { .compatible = "mediatek,mt6358-rtc", },
        { .compatible = "mediatek,mt6397-rtc", },
        { }
 };
-- 
1.9.1