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Subject[PATCH v3 10/10] rtc: Add support for the MediaTek MT6358 RTC
Date
From: Ran Bi <ran.bi@mediatek.com>

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@mediatek.com>
---
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
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