Hi,
The subject should be:
"rtc: mt6397: Add support for the MediaTek MT6358 RTC"
On 05/08/2019 13:21:58+0800, Hsin-Hsiung Wang wrote:
> 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.
>
> Review-by: Yingjoe Chen <yingjoe.chen@xxxxxxxxxxxx>
> 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 828def7..e23c215 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_compatible {
I would name that struct mtk_rtc_data
> + u32 wrtgr_addr;
and this member should be wrtgr_offset or simply wrtgr.
> +};
> +
> struct mt6397_rtc {
> struct device *dev;
> struct rtc_device *rtc_dev;
> @@ -70,7 +76,25 @@ 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)
> {
> @@ -78,7 +102,8 @@ 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;
>
> @@ -324,6 +349,7 @@ 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);
> @@ -333,6 +359,13 @@ 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;
This will never happen because probe would not be called if there is no
match. You could also use of_device_get_match_data to avoid having to
move the of_device_id table.
> + }
> + rtc->dev_comp = of_id->data;
> +
> rtc->irq = platform_get_irq(pdev, 0);
> if (rtc->irq < 0)
> return rtc->irq;
> @@ -408,12 +441,6 @@ 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
>
--
Alexandre Belloni, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com
