[PATCH v6 6/6] rtc: Add support for the MediaTek MT6358 RTC

Hsin-Hsiung Wang
2019-12-06T13:38:57Z

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>
Signed-off-by: Hsin-Hsiung Wang <hsin-hsiung.wang@mediatek.com>
---
drivers/rtc/rtc-mt6397.c | 38 ++++++++++++++++++++++++++++++--------
1 file changed, 30 insertions(+), 8 deletions(-)

diff --git a/drivers/rtc/rtc-mt6397.c b/drivers/rtc/rtc-mt6397.c
index b216bdc..631e275 100644
--- a/drivers/rtc/rtc-mt6397.c
+++ b/drivers/rtc/rtc-mt6397.c
@@ -12,6 +12,7 @@
#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>
@@ -19,7 +20,8 @@
#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)
@@ -63,6 +65,10 @@
#define RTC_NUM_YEARS 128
#define RTC_MIN_YEAR_OFFSET (RTC_MIN_YEAR - RTC_BASE_YEAR)

+struct mtk_rtc_data {
+ u32 wrtgr;
+};
+
struct mt6397_rtc {
struct device *dev;
struct rtc_device *rtc_dev;
@@ -70,15 +76,34 @@ struct mt6397_rtc {
struct regmap *regmap;
int irq;
u32 addr_base;
+ const struct mtk_rtc_data *data;
+};
+
+static const struct mtk_rtc_data mt6358_rtc_data = {
+ .wrtgr = RTC_WRTGR_MT6358,
};

+static const struct mtk_rtc_data mt6397_rtc_data = {
+ .wrtgr = RTC_WRTGR_MT6397,
+};
+
+static const struct of_device_id mt6397_rtc_of_match[] = {
+ { .compatible = "mediatek,mt6358-rtc",
+ .data = (void *)&mt6358_rtc_data, },
+ { .compatible = "mediatek,mt6397-rtc",
+ .data = (void *)&mt6397_rtc_data, },
+ {}
+};
+MODULE_DEVICE_TABLE(of, mt6397_rtc_of_match);
+
static int mtk_rtc_write_trigger(struct mt6397_rtc *rtc)
{
unsigned long timeout = jiffies + HZ;
int ret;
u32 data;

- ret = regmap_write(rtc->regmap, rtc->addr_base + RTC_WRTGR, 1);
+ ret = regmap_write(rtc->regmap,
+ rtc->addr_base + rtc->data->wrtgr, 1);
if (ret < 0)
return ret;

@@ -333,6 +358,9 @@ static int mtk_rtc_probe(struct platform_device *pdev)
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
rtc->addr_base = res->start;

+ rtc->data = (struct mtk_rtc_data *)
+ of_device_get_match_data(&pdev->dev);
+
rtc->irq = platform_get_irq(pdev, 0);
if (rtc->irq < 0)
return rtc->irq;
@@ -406,12 +434,6 @@ 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",
--
2.6.4