[PATCH v3 10/10] rtc: Add support for the MediaTek MT6358 RTC

[Hsin-Hsiung Wang]

From: Ran Bi <ran.bi@xxxxxxxxxxxx>

This add support for the MediaTek MT6358 RTC. Driver using
compatible data to store different RTC_WRTGR address offset.

Signed-off-by: Ran Bi <ran.bi@xxxxxxxxxxxx>
---
 drivers/rtc/rtc-mt6397.c | 43 ++++++++++++++++++++++++++++++++--------
 1 file changed, 35 insertions(+), 8 deletions(-)

diff --git a/drivers/rtc/rtc-mt6397.c b/drivers/rtc/rtc-mt6397.c
index f85f1fc29e32..3476e29db87c 100644
--- a/drivers/rtc/rtc-mt6397.c
+++ b/drivers/rtc/rtc-mt6397.c
@@ -20,6 +20,7 @@
 #include <linux/irqdomain.h>
 #include <linux/platform_device.h>
 #include <linux/of_address.h>
+#include <linux/of_device.h>
 #include <linux/of_irq.h>
 #include <linux/io.h>
 #include <linux/mfd/mt6397/core.h>
@@ -27,7 +28,8 @@
 #define RTC_BBPU		0x0000
 #define RTC_BBPU_CBUSY		BIT(6)
 
-#define RTC_WRTGR		0x003c
+#define RTC_WRTGR_MT6358	0x3a
+#define RTC_WRTGR_MT6397	0x3c
 
 #define RTC_IRQ_STA		0x0002
 #define RTC_IRQ_STA_AL		BIT(0)
@@ -71,6 +73,10 @@
 #define RTC_NUM_YEARS		128
 #define RTC_MIN_YEAR_OFFSET	(RTC_MIN_YEAR - RTC_BASE_YEAR)
 
+struct mtk_rtc_compatible {
+	u32			wrtgr_addr;
+};
+
 struct mt6397_rtc {
 	struct device		*dev;
 	struct rtc_device	*rtc_dev;
@@ -78,7 +84,25 @@ struct mt6397_rtc {
 	struct regmap		*regmap;
 	int			irq;
 	u32			addr_base;
+	const struct mtk_rtc_compatible *dev_comp;
+};
+
+static const struct mtk_rtc_compatible mt6358_rtc_compat = {
+	.wrtgr_addr = RTC_WRTGR_MT6358,
+};
+
+static const struct mtk_rtc_compatible mt6397_rtc_compat = {
+	.wrtgr_addr = RTC_WRTGR_MT6397,
+};
+
+static const struct of_device_id mt6397_rtc_of_match[] = {
+	{ .compatible = "mediatek,mt6358-rtc",
+		.data = (void *)&mt6358_rtc_compat, },
+	{ .compatible = "mediatek,mt6397-rtc",
+		.data = (void *)&mt6397_rtc_compat, },
+	{}
 };
+MODULE_DEVICE_TABLE(of, mt6397_rtc_of_match);
 
 static int mtk_rtc_write_trigger(struct mt6397_rtc *rtc)
 {
@@ -86,7 +110,8 @@ 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->dev_comp->wrtgr_addr, 1);
 	if (ret < 0)
 		return ret;
 
@@ -332,6 +357,7 @@ static int mtk_rtc_probe(struct platform_device *pdev)
 	struct resource *res;
 	struct mt6397_chip *mt6397_chip = dev_get_drvdata(pdev->dev.parent);
 	struct mt6397_rtc *rtc;
+	const struct of_device_id *of_id;
 	int ret;
 
 	rtc = devm_kzalloc(&pdev->dev, sizeof(struct mt6397_rtc), GFP_KERNEL);
@@ -341,6 +367,13 @@ static int mtk_rtc_probe(struct platform_device *pdev)
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	rtc->addr_base = res->start;
 
+	of_id = of_match_device(mt6397_rtc_of_match, &pdev->dev);
+	if (!of_id) {
+		dev_err(&pdev->dev, "Failed to probe of_node\n");
+		return -EINVAL;
+	}
+	rtc->dev_comp = of_id->data;
+
 	rtc->irq = platform_get_irq(pdev, 0);
 	if (rtc->irq < 0)
 		return rtc->irq;
@@ -419,12 +452,6 @@ static int mt6397_rtc_resume(struct device *dev)
 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,mt6397-rtc", },
-	{ }
-};
-MODULE_DEVICE_TABLE(of, mt6397_rtc_of_match);
-
 static struct platform_driver mtk_rtc_driver = {
 	.driver = {
 		.name = "mt6397-rtc",
-- 
2.18.0