[PATCH v3 0/3] watchdog: mtk_wdt: refactor code to support more watchdogs

[PATCH v3 0/3] watchdog: mtk_wdt: refactor code to support more watchdogs

[Boris Lysov]

This series aims to refactor existing mtk_wdt driver by making some
constants dependent on a particular SoC. It is done because some mtk
watchdogs, while working in same manner, have slightly different
parameters such as specific register unlock key value and an offset of a
particular register field.

This patch set adds support for mt6577 watchdog.

Accepting these patches will make ground for submitting additional
changes related to the mainline support of mt6577 (and other compatible
SoCs) in future.

Proposed patches successfully pass all `checkpatch.pl` checks and don't
yield compiler warnings.

Resulting code has been thoroughly tested multiple times for hours on
real hardware (mt6577, mt6589) to ensure that proposed changes are
working properly.

Changes since v2 [3]:
- rename the newly introduced structure element ('data' -> 'config') to
  avoid changing the names of already existing variables; suggested [4]
  by Guenter Roeck.

Changes since v1 [1]:
- a complete rewrite to get rid of the configuration flags which made
  the watchdog not support other SoCs; suggested [2] by Guenter Roeck.

[1] https://lore.kernel.org/linux-mediatek/20210131234425.9773-1-arzamas-16@mail.ee/
[2] https://lore.kernel.org/linux-mediatek/050f2f8e-9c3c-10e3-05ef-cd84e949b98f@roeck-us.net/
[3] https://lore.kernel.org/linux-mediatek/20210509211702.549-1-arzamas-16@mail.ee/
[4] https://lore.kernel.org/linux-mediatek/efdce3a5-e5b4-19a8-35f1-8a536220bb3f@roeck-us.net/

Boris Lysov (3):
  watchdog: mtk_wdt: Refactor code to support more SoCs
  dt-bindings: watchdog: mediatek: add support for mt6577 SoC
  watchdog: mtk_wdt: add support for mt6577

 .../devicetree/bindings/watchdog/mtk-wdt.txt  |  1 +
 drivers/watchdog/mtk_wdt.c                    | 88 +++++++++++++++----
 2 files changed, 70 insertions(+), 19 deletions(-)

-- 
2.20.1

[PATCH v3 1/3] watchdog: mtk_wdt: Refactor code to support more SoCs

[Boris Lysov]

This patch makes some constants SoC-dependent to support more watchdogs
in the future. It adds shifts of WDT_MODE_KEY and SWSYSRST_KEY to
mtk_wdt_data struct. This is done to bring support for various Mediatek
watchdogs which use same register structure but slightly different field
offsets in the UNLOCK_KEY registers. For example, mt6577 watchdog has
WDT_MODE_KEY and SWSYSRST_KEY at [15:8] instead of currently (and only)
supported [31:24].
Moreover, this patch adds SWSYSRST_KEY value to mtk_wdt_data because this
value also depends on specific SoC watchdog, for example mt6577 uses 0x15
instead of 0x88.

Signed-off-by: Boris Lysov <arzamas-16@mail.ee>
---
Changes since v2 [3]:
- rename the newly introduced structure element ('data' -> 'config') to
  avoid changing the names of already existing variables; suggested [4]
  by Guenter Roeck.

Changes since v1 [1]:
- a complete rewrite to get rid of the configuration flags which made
  the watchdog not support other SoCs; suggested [2] by Guenter Roeck.

[1] https://lore.kernel.org/linux-mediatek/20210131234425.9773-3-arzamas-16@mail.ee/
[2] https://lore.kernel.org/linux-mediatek/050f2f8e-9c3c-10e3-05ef-cd84e949b98f@roeck-us.net/
[3] https://lore.kernel.org/linux-mediatek/20210509211702.549-2-arzamas-16@mail.ee/
[4] https://lore.kernel.org/linux-mediatek/efdce3a5-e5b4-19a8-35f1-8a536220bb3f@roeck-us.net/

 drivers/watchdog/mtk_wdt.c | 66 ++++++++++++++++++++++++++++++--------
 1 file changed, 52 insertions(+), 14 deletions(-)

diff --git a/drivers/watchdog/mtk_wdt.c b/drivers/watchdog/mtk_wdt.c
index 97ca993bd009..0878fa33dffe 100644
--- a/drivers/watchdog/mtk_wdt.c
+++ b/drivers/watchdog/mtk_wdt.c
@@ -44,13 +44,27 @@
 #define WDT_MODE_IRQ_EN		(1 << 3)
 #define WDT_MODE_AUTO_START	(1 << 4)
 #define WDT_MODE_DUAL_EN	(1 << 6)
-#define WDT_MODE_KEY		0x22000000
+#define WDT_MODE_KEY		0x22
 
 #define WDT_SWRST		0x14
 #define WDT_SWRST_KEY		0x1209
-
 #define WDT_SWSYSRST		0x18U
-#define WDT_SWSYS_RST_KEY	0x88000000
+
+#define MT2712_WDT_MODE_KEY_SHIFT	24		// unlock_key [31:24]
+#define MT2712_SWSYSRST_KEY_SHIFT	24		// unlock_key [31:24]
+#define MT2712_SWSYSRST_KEY		0x88
+
+#define MT6589_WDT_MODE_KEY_SHIFT	24		// unlock_key [31:24]
+#define MT6589_SWSYSRST_KEY_SHIFT	24		// unlock_key [31:24]
+#define MT6589_SWSYSRST_KEY		0x88
+
+#define MT8183_WDT_MODE_KEY_SHIFT	24		// unlock_key [31:24]
+#define MT8183_SWSYSRST_KEY_SHIFT	24		// unlock_key [31:24]
+#define MT8183_SWSYSRST_KEY		0x88
+
+#define MT8192_WDT_MODE_KEY_SHIFT	24		// unlock_key [31:24]
+#define MT8192_SWSYSRST_KEY_SHIFT	24		// unlock_key [31:24]
+#define MT8192_SWSYSRST_KEY		0x88
 
 #define DRV_NAME		"mtk-wdt"
 #define DRV_VERSION		"1.0"
@@ -60,6 +74,7 @@ static unsigned int timeout;
 
 struct mtk_wdt_dev {
 	struct watchdog_device wdt_dev;
+	const struct mtk_wdt_data *config;
 	void __iomem *wdt_base;
 	spinlock_t lock; /* protects WDT_SWSYSRST reg */
 	struct reset_controller_dev rcdev;
@@ -67,18 +82,37 @@ struct mtk_wdt_dev {
 
 struct mtk_wdt_data {
 	int toprgu_sw_rst_num;
+	u8 wdt_mode_key_shift;
+	u8 wdt_swsys_rst_key;
+	u8 wdt_swsys_rst_key_shift;
 };
 
 static const struct mtk_wdt_data mt2712_data = {
-	.toprgu_sw_rst_num = MT2712_TOPRGU_SW_RST_NUM,
+	.toprgu_sw_rst_num =		MT2712_TOPRGU_SW_RST_NUM,
+	.wdt_mode_key_shift =		MT2712_WDT_MODE_KEY_SHIFT,
+	.wdt_swsys_rst_key_shift =	MT2712_SWSYSRST_KEY_SHIFT,
+	.wdt_swsys_rst_key =		MT2712_SWSYSRST_KEY,
+};
+
+static const struct mtk_wdt_data mt6589_data = {
+	.toprgu_sw_rst_num =		-1,
+	.wdt_mode_key_shift =		MT6589_WDT_MODE_KEY_SHIFT,
+	.wdt_swsys_rst_key_shift =	MT6589_SWSYSRST_KEY_SHIFT,
+	.wdt_swsys_rst_key =		MT6589_SWSYSRST_KEY,
 };
 
 static const struct mtk_wdt_data mt8183_data = {
-	.toprgu_sw_rst_num = MT8183_TOPRGU_SW_RST_NUM,
+	.toprgu_sw_rst_num =		MT8183_TOPRGU_SW_RST_NUM,
+	.wdt_mode_key_shift =		MT8183_WDT_MODE_KEY_SHIFT,
+	.wdt_swsys_rst_key_shift =	MT8183_SWSYSRST_KEY_SHIFT,
+	.wdt_swsys_rst_key =		MT8183_SWSYSRST_KEY,
 };
 
 static const struct mtk_wdt_data mt8192_data = {
-	.toprgu_sw_rst_num = MT8192_TOPRGU_SW_RST_NUM,
+	.toprgu_sw_rst_num =		MT8192_TOPRGU_SW_RST_NUM,
+	.wdt_mode_key_shift =		MT8192_WDT_MODE_KEY_SHIFT,
+	.wdt_swsys_rst_key_shift =	MT8192_SWSYSRST_KEY_SHIFT,
+	.wdt_swsys_rst_key =		MT8192_SWSYSRST_KEY,
 };
 
 static int toprgu_reset_update(struct reset_controller_dev *rcdev,
@@ -96,7 +130,7 @@ static int toprgu_reset_update(struct reset_controller_dev *rcdev,
 		tmp |= BIT(id);
 	else
 		tmp &= ~BIT(id);
-	tmp |= WDT_SWSYS_RST_KEY;
+	tmp |= data->config->wdt_swsys_rst_key << data->config->wdt_swsys_rst_key_shift;
 	writel(tmp, data->wdt_base + WDT_SWSYSRST);
 
 	spin_unlock_irqrestore(&data->lock, flags);
@@ -221,7 +255,7 @@ static int mtk_wdt_stop(struct watchdog_device *wdt_dev)
 
 	reg = readl(wdt_base + WDT_MODE);
 	reg &= ~WDT_MODE_EN;
-	reg |= WDT_MODE_KEY;
+	reg |= WDT_MODE_KEY << mtk_wdt->config->wdt_mode_key_shift;
 	iowrite32(reg, wdt_base + WDT_MODE);
 
 	return 0;
@@ -240,7 +274,7 @@ static int mtk_wdt_start(struct watchdog_device *wdt_dev)
 
 	reg = ioread32(wdt_base + WDT_MODE);
 	reg &= ~(WDT_MODE_IRQ_EN | WDT_MODE_DUAL_EN);
-	reg |= (WDT_MODE_EN | WDT_MODE_KEY);
+	reg |= (WDT_MODE_EN | (WDT_MODE_KEY << mtk_wdt->config->wdt_mode_key_shift));
 	iowrite32(reg, wdt_base + WDT_MODE);
 
 	return 0;
@@ -266,7 +300,6 @@ static int mtk_wdt_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct mtk_wdt_dev *mtk_wdt;
-	const struct mtk_wdt_data *wdt_data;
 	int err;
 
 	mtk_wdt = devm_kzalloc(dev, sizeof(*mtk_wdt), GFP_KERNEL);
@@ -279,6 +312,12 @@ static int mtk_wdt_probe(struct platform_device *pdev)
 	if (IS_ERR(mtk_wdt->wdt_base))
 		return PTR_ERR(mtk_wdt->wdt_base);
 
+	mtk_wdt->config = of_device_get_match_data(dev);
+	if (!mtk_wdt->config) {
+		dev_err(dev, "watchdog data is not defined\n");
+		return -EINVAL;
+	}
+
 	mtk_wdt->wdt_dev.info = &mtk_wdt_info;
 	mtk_wdt->wdt_dev.ops = &mtk_wdt_ops;
 	mtk_wdt->wdt_dev.timeout = WDT_MAX_TIMEOUT;
@@ -302,10 +341,9 @@ static int mtk_wdt_probe(struct platform_device *pdev)
 	dev_info(dev, "Watchdog enabled (timeout=%d sec, nowayout=%d)\n",
 		 mtk_wdt->wdt_dev.timeout, nowayout);
 
-	wdt_data = of_device_get_match_data(dev);
-	if (wdt_data) {
+	if (mtk_wdt->config->toprgu_sw_rst_num > -1) {
 		err = toprgu_register_reset_controller(pdev,
-						       wdt_data->toprgu_sw_rst_num);
+						       mtk_wdt->config->toprgu_sw_rst_num);
 		if (err)
 			return err;
 	}
@@ -338,7 +376,7 @@ static int mtk_wdt_resume(struct device *dev)
 
 static const struct of_device_id mtk_wdt_dt_ids[] = {
 	{ .compatible = "mediatek,mt2712-wdt", .data = &mt2712_data },
-	{ .compatible = "mediatek,mt6589-wdt" },
+	{ .compatible = "mediatek,mt6589-wdt", .data = &mt6589_data },
 	{ .compatible = "mediatek,mt8183-wdt", .data = &mt8183_data },
 	{ .compatible = "mediatek,mt8192-wdt", .data = &mt8192_data },
 	{ /* sentinel */ }
-- 
2.20.1

Re: [PATCH v3 1/3] watchdog: mtk_wdt: Refactor code to support more SoCs

[Guenter Roeck]

On Thu, May 13, 2021 at 04:35:13AM +0300, Boris Lysov wrote:
> This patch makes some constants SoC-dependent to support more watchdogs
> in the future. It adds shifts of WDT_MODE_KEY and SWSYSRST_KEY to
> mtk_wdt_data struct. This is done to bring support for various Mediatek
> watchdogs which use same register structure but slightly different field
> offsets in the UNLOCK_KEY registers. For example, mt6577 watchdog has
> WDT_MODE_KEY and SWSYSRST_KEY at [15:8] instead of currently (and only)
> supported [31:24].
> Moreover, this patch adds SWSYSRST_KEY value to mtk_wdt_data because this
> value also depends on specific SoC watchdog, for example mt6577 uses 0x15
> instead of 0x88.
> 
> Signed-off-by: Boris Lysov <arzamas-16@mail.ee>

Reviewed-by: Guenter Roeck <linux@roeck-us.net>

> ---
> Changes since v2 [3]:
> - rename the newly introduced structure element ('data' -> 'config') to
>   avoid changing the names of already existing variables; suggested [4]
>   by Guenter Roeck.
> 
> Changes since v1 [1]:
> - a complete rewrite to get rid of the configuration flags which made
>   the watchdog not support other SoCs; suggested [2] by Guenter Roeck.
> 
> [1] https://lore.kernel.org/linux-mediatek/20210131234425.9773-3-arzamas-16@mail.ee/
> [2] https://lore.kernel.org/linux-mediatek/050f2f8e-9c3c-10e3-05ef-cd84e949b98f@roeck-us.net/
> [3] https://lore.kernel.org/linux-mediatek/20210509211702.549-2-arzamas-16@mail.ee/
> [4] https://lore.kernel.org/linux-mediatek/efdce3a5-e5b4-19a8-35f1-8a536220bb3f@roeck-us.net/
> 
>  drivers/watchdog/mtk_wdt.c | 66 ++++++++++++++++++++++++++++++--------
>  1 file changed, 52 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/watchdog/mtk_wdt.c b/drivers/watchdog/mtk_wdt.c
> index 97ca993bd009..0878fa33dffe 100644
> --- a/drivers/watchdog/mtk_wdt.c
> +++ b/drivers/watchdog/mtk_wdt.c
> @@ -44,13 +44,27 @@
>  #define WDT_MODE_IRQ_EN		(1 << 3)
>  #define WDT_MODE_AUTO_START	(1 << 4)
>  #define WDT_MODE_DUAL_EN	(1 << 6)
> -#define WDT_MODE_KEY		0x22000000
> +#define WDT_MODE_KEY		0x22
>  
>  #define WDT_SWRST		0x14
>  #define WDT_SWRST_KEY		0x1209
> -
>  #define WDT_SWSYSRST		0x18U
> -#define WDT_SWSYS_RST_KEY	0x88000000
> +
> +#define MT2712_WDT_MODE_KEY_SHIFT	24		// unlock_key [31:24]
> +#define MT2712_SWSYSRST_KEY_SHIFT	24		// unlock_key [31:24]
> +#define MT2712_SWSYSRST_KEY		0x88
> +
> +#define MT6589_WDT_MODE_KEY_SHIFT	24		// unlock_key [31:24]
> +#define MT6589_SWSYSRST_KEY_SHIFT	24		// unlock_key [31:24]
> +#define MT6589_SWSYSRST_KEY		0x88
> +
> +#define MT8183_WDT_MODE_KEY_SHIFT	24		// unlock_key [31:24]
> +#define MT8183_SWSYSRST_KEY_SHIFT	24		// unlock_key [31:24]
> +#define MT8183_SWSYSRST_KEY		0x88
> +
> +#define MT8192_WDT_MODE_KEY_SHIFT	24		// unlock_key [31:24]
> +#define MT8192_SWSYSRST_KEY_SHIFT	24		// unlock_key [31:24]
> +#define MT8192_SWSYSRST_KEY		0x88
>  
>  #define DRV_NAME		"mtk-wdt"
>  #define DRV_VERSION		"1.0"
> @@ -60,6 +74,7 @@ static unsigned int timeout;
>  
>  struct mtk_wdt_dev {
>  	struct watchdog_device wdt_dev;
> +	const struct mtk_wdt_data *config;
>  	void __iomem *wdt_base;
>  	spinlock_t lock; /* protects WDT_SWSYSRST reg */
>  	struct reset_controller_dev rcdev;
> @@ -67,18 +82,37 @@ struct mtk_wdt_dev {
>  
>  struct mtk_wdt_data {
>  	int toprgu_sw_rst_num;
> +	u8 wdt_mode_key_shift;
> +	u8 wdt_swsys_rst_key;
> +	u8 wdt_swsys_rst_key_shift;
>  };
>  
>  static const struct mtk_wdt_data mt2712_data = {
> -	.toprgu_sw_rst_num = MT2712_TOPRGU_SW_RST_NUM,
> +	.toprgu_sw_rst_num =		MT2712_TOPRGU_SW_RST_NUM,
> +	.wdt_mode_key_shift =		MT2712_WDT_MODE_KEY_SHIFT,
> +	.wdt_swsys_rst_key_shift =	MT2712_SWSYSRST_KEY_SHIFT,
> +	.wdt_swsys_rst_key =		MT2712_SWSYSRST_KEY,
> +};
> +
> +static const struct mtk_wdt_data mt6589_data = {
> +	.toprgu_sw_rst_num =		-1,
> +	.wdt_mode_key_shift =		MT6589_WDT_MODE_KEY_SHIFT,
> +	.wdt_swsys_rst_key_shift =	MT6589_SWSYSRST_KEY_SHIFT,
> +	.wdt_swsys_rst_key =		MT6589_SWSYSRST_KEY,
>  };
>  
>  static const struct mtk_wdt_data mt8183_data = {
> -	.toprgu_sw_rst_num = MT8183_TOPRGU_SW_RST_NUM,
> +	.toprgu_sw_rst_num =		MT8183_TOPRGU_SW_RST_NUM,
> +	.wdt_mode_key_shift =		MT8183_WDT_MODE_KEY_SHIFT,
> +	.wdt_swsys_rst_key_shift =	MT8183_SWSYSRST_KEY_SHIFT,
> +	.wdt_swsys_rst_key =		MT8183_SWSYSRST_KEY,
>  };
>  
>  static const struct mtk_wdt_data mt8192_data = {
> -	.toprgu_sw_rst_num = MT8192_TOPRGU_SW_RST_NUM,
> +	.toprgu_sw_rst_num =		MT8192_TOPRGU_SW_RST_NUM,
> +	.wdt_mode_key_shift =		MT8192_WDT_MODE_KEY_SHIFT,
> +	.wdt_swsys_rst_key_shift =	MT8192_SWSYSRST_KEY_SHIFT,
> +	.wdt_swsys_rst_key =		MT8192_SWSYSRST_KEY,
>  };
>  
>  static int toprgu_reset_update(struct reset_controller_dev *rcdev,
> @@ -96,7 +130,7 @@ static int toprgu_reset_update(struct reset_controller_dev *rcdev,
>  		tmp |= BIT(id);
>  	else
>  		tmp &= ~BIT(id);
> -	tmp |= WDT_SWSYS_RST_KEY;
> +	tmp |= data->config->wdt_swsys_rst_key << data->config->wdt_swsys_rst_key_shift;
>  	writel(tmp, data->wdt_base + WDT_SWSYSRST);
>  
>  	spin_unlock_irqrestore(&data->lock, flags);
> @@ -221,7 +255,7 @@ static int mtk_wdt_stop(struct watchdog_device *wdt_dev)
>  
>  	reg = readl(wdt_base + WDT_MODE);
>  	reg &= ~WDT_MODE_EN;
> -	reg |= WDT_MODE_KEY;
> +	reg |= WDT_MODE_KEY << mtk_wdt->config->wdt_mode_key_shift;
>  	iowrite32(reg, wdt_base + WDT_MODE);
>  
>  	return 0;
> @@ -240,7 +274,7 @@ static int mtk_wdt_start(struct watchdog_device *wdt_dev)
>  
>  	reg = ioread32(wdt_base + WDT_MODE);
>  	reg &= ~(WDT_MODE_IRQ_EN | WDT_MODE_DUAL_EN);
> -	reg |= (WDT_MODE_EN | WDT_MODE_KEY);
> +	reg |= (WDT_MODE_EN | (WDT_MODE_KEY << mtk_wdt->config->wdt_mode_key_shift));
>  	iowrite32(reg, wdt_base + WDT_MODE);
>  
>  	return 0;
> @@ -266,7 +300,6 @@ static int mtk_wdt_probe(struct platform_device *pdev)
>  {
>  	struct device *dev = &pdev->dev;
>  	struct mtk_wdt_dev *mtk_wdt;
> -	const struct mtk_wdt_data *wdt_data;
>  	int err;
>  
>  	mtk_wdt = devm_kzalloc(dev, sizeof(*mtk_wdt), GFP_KERNEL);
> @@ -279,6 +312,12 @@ static int mtk_wdt_probe(struct platform_device *pdev)
>  	if (IS_ERR(mtk_wdt->wdt_base))
>  		return PTR_ERR(mtk_wdt->wdt_base);
>  
> +	mtk_wdt->config = of_device_get_match_data(dev);
> +	if (!mtk_wdt->config) {
> +		dev_err(dev, "watchdog data is not defined\n");
> +		return -EINVAL;
> +	}
> +
>  	mtk_wdt->wdt_dev.info = &mtk_wdt_info;
>  	mtk_wdt->wdt_dev.ops = &mtk_wdt_ops;
>  	mtk_wdt->wdt_dev.timeout = WDT_MAX_TIMEOUT;
> @@ -302,10 +341,9 @@ static int mtk_wdt_probe(struct platform_device *pdev)
>  	dev_info(dev, "Watchdog enabled (timeout=%d sec, nowayout=%d)\n",
>  		 mtk_wdt->wdt_dev.timeout, nowayout);
>  
> -	wdt_data = of_device_get_match_data(dev);
> -	if (wdt_data) {
> +	if (mtk_wdt->config->toprgu_sw_rst_num > -1) {
>  		err = toprgu_register_reset_controller(pdev,
> -						       wdt_data->toprgu_sw_rst_num);
> +						       mtk_wdt->config->toprgu_sw_rst_num);
>  		if (err)
>  			return err;
>  	}
> @@ -338,7 +376,7 @@ static int mtk_wdt_resume(struct device *dev)
>  
>  static const struct of_device_id mtk_wdt_dt_ids[] = {
>  	{ .compatible = "mediatek,mt2712-wdt", .data = &mt2712_data },
> -	{ .compatible = "mediatek,mt6589-wdt" },
> +	{ .compatible = "mediatek,mt6589-wdt", .data = &mt6589_data },
>  	{ .compatible = "mediatek,mt8183-wdt", .data = &mt8183_data },
>  	{ .compatible = "mediatek,mt8192-wdt", .data = &mt8192_data },
>  	{ /* sentinel */ }
> -- 
> 2.20.1
> 

[PATCH v3 2/3] dt-bindings: watchdog: mediatek: add support for mt6577 SoC

[Boris Lysov]

Add support for Mediatek mt6577 SoC to device tree binding
documentation.

Signed-off-by: Boris Lysov <arzamas-16@mail.ee>
---
 Documentation/devicetree/bindings/watchdog/mtk-wdt.txt | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Documentation/devicetree/bindings/watchdog/mtk-wdt.txt b/Documentation/devicetree/bindings/watchdog/mtk-wdt.txt
index e36ba60de829..f5a5404523a3 100644
--- a/Documentation/devicetree/bindings/watchdog/mtk-wdt.txt
+++ b/Documentation/devicetree/bindings/watchdog/mtk-wdt.txt
@@ -5,6 +5,7 @@ Required properties:
 - compatible should contain:
 	"mediatek,mt2701-wdt", "mediatek,mt6589-wdt": for MT2701
 	"mediatek,mt2712-wdt": for MT2712
+	"mediatek,mt6577-wdt": for MT6577
 	"mediatek,mt6589-wdt": for MT6589
 	"mediatek,mt6797-wdt", "mediatek,mt6589-wdt": for MT6797
 	"mediatek,mt7622-wdt", "mediatek,mt6589-wdt": for MT7622
-- 
2.20.1

Re: [PATCH v3 2/3] dt-bindings: watchdog: mediatek: add support for mt6577 SoC

[Rob Herring]

On Thu, 13 May 2021 04:35:14 +0300, Boris Lysov wrote:
> Add support for Mediatek mt6577 SoC to device tree binding
> documentation.
> 
> Signed-off-by: Boris Lysov <arzamas-16@mail.ee>
> ---
>  Documentation/devicetree/bindings/watchdog/mtk-wdt.txt | 1 +
>  1 file changed, 1 insertion(+)
> 

Acked-by: Rob Herring <robh@kernel.org>

Re: [PATCH v3 2/3] dt-bindings: watchdog: mediatek: add support for mt6577 SoC

[Guenter Roeck]

On Thu, May 13, 2021 at 04:35:14AM +0300, Boris Lysov wrote:
> Add support for Mediatek mt6577 SoC to device tree binding
> documentation.
> 
> Signed-off-by: Boris Lysov <arzamas-16@mail.ee>

Reviewed-by: Guenter Roeck <linux@roeck-us.net>

> ---
>  Documentation/devicetree/bindings/watchdog/mtk-wdt.txt | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/Documentation/devicetree/bindings/watchdog/mtk-wdt.txt b/Documentation/devicetree/bindings/watchdog/mtk-wdt.txt
> index e36ba60de829..f5a5404523a3 100644
> --- a/Documentation/devicetree/bindings/watchdog/mtk-wdt.txt
> +++ b/Documentation/devicetree/bindings/watchdog/mtk-wdt.txt
> @@ -5,6 +5,7 @@ Required properties:
>  - compatible should contain:
>  	"mediatek,mt2701-wdt", "mediatek,mt6589-wdt": for MT2701
>  	"mediatek,mt2712-wdt": for MT2712
> +	"mediatek,mt6577-wdt": for MT6577
>  	"mediatek,mt6589-wdt": for MT6589
>  	"mediatek,mt6797-wdt", "mediatek,mt6589-wdt": for MT6797
>  	"mediatek,mt7622-wdt", "mediatek,mt6589-wdt": for MT7622
> -- 
> 2.20.1
> 

[PATCH v3 3/3] watchdog: mtk_wdt: add support for mt6577

[Boris Lysov]

This patch adds support for watchdog used by mt6577 and related SoCs such
as mt6575 and mt8317. These watchdogs are known for having shifted WDT_MODE
and SWSYSRST registers and using different SWSYSRST_KEY value.

Signed-off-by: Boris Lysov <arzamas-16@mail.ee>
---
 drivers/watchdog/mtk_wdt.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/watchdog/mtk_wdt.c b/drivers/watchdog/mtk_wdt.c
index 0878fa33dffe..91d498b5d212 100644
--- a/drivers/watchdog/mtk_wdt.c
+++ b/drivers/watchdog/mtk_wdt.c
@@ -54,6 +54,10 @@
 #define MT2712_SWSYSRST_KEY_SHIFT	24		// unlock_key [31:24]
 #define MT2712_SWSYSRST_KEY		0x88
 
+#define MT6577_WDT_MODE_KEY_SHIFT	8		// unlock_key [15:8]
+#define MT6577_SWSYSRST_KEY_SHIFT	8		// unlock_key [15:8]
+#define MT6577_SWSYSRST_KEY		0x15
+
 #define MT6589_WDT_MODE_KEY_SHIFT	24		// unlock_key [31:24]
 #define MT6589_SWSYSRST_KEY_SHIFT	24		// unlock_key [31:24]
 #define MT6589_SWSYSRST_KEY		0x88
@@ -94,6 +98,13 @@ static const struct mtk_wdt_data mt2712_data = {
 	.wdt_swsys_rst_key =		MT2712_SWSYSRST_KEY,
 };
 
+static const struct mtk_wdt_data mt6577_data = {
+	.toprgu_sw_rst_num =		-1,
+	.wdt_mode_key_shift =		MT6577_WDT_MODE_KEY_SHIFT,
+	.wdt_swsys_rst_key_shift =	MT6577_SWSYSRST_KEY_SHIFT,
+	.wdt_swsys_rst_key =		MT6577_SWSYSRST_KEY,
+};
+
 static const struct mtk_wdt_data mt6589_data = {
 	.toprgu_sw_rst_num =		-1,
 	.wdt_mode_key_shift =		MT6589_WDT_MODE_KEY_SHIFT,
@@ -376,6 +387,7 @@ static int mtk_wdt_resume(struct device *dev)
 
 static const struct of_device_id mtk_wdt_dt_ids[] = {
 	{ .compatible = "mediatek,mt2712-wdt", .data = &mt2712_data },
+	{ .compatible = "mediatek,mt6577-wdt", .data = &mt6577_data },
 	{ .compatible = "mediatek,mt6589-wdt", .data = &mt6589_data },
 	{ .compatible = "mediatek,mt8183-wdt", .data = &mt8183_data },
 	{ .compatible = "mediatek,mt8192-wdt", .data = &mt8192_data },
-- 
2.20.1

Re: [PATCH v3 3/3] watchdog: mtk_wdt: add support for mt6577

[Guenter Roeck]

On Thu, May 13, 2021 at 04:35:15AM +0300, Boris Lysov wrote:
> This patch adds support for watchdog used by mt6577 and related SoCs such
> as mt6575 and mt8317. These watchdogs are known for having shifted WDT_MODE
> and SWSYSRST registers and using different SWSYSRST_KEY value.
> 
> Signed-off-by: Boris Lysov <arzamas-16@mail.ee>

Reviewed-by: Guenter Roeck <linux@roeck-us.net>

> ---
>  drivers/watchdog/mtk_wdt.c | 12 ++++++++++++
>  1 file changed, 12 insertions(+)
> 
> diff --git a/drivers/watchdog/mtk_wdt.c b/drivers/watchdog/mtk_wdt.c
> index 0878fa33dffe..91d498b5d212 100644
> --- a/drivers/watchdog/mtk_wdt.c
> +++ b/drivers/watchdog/mtk_wdt.c
> @@ -54,6 +54,10 @@
>  #define MT2712_SWSYSRST_KEY_SHIFT	24		// unlock_key [31:24]
>  #define MT2712_SWSYSRST_KEY		0x88
>  
> +#define MT6577_WDT_MODE_KEY_SHIFT	8		// unlock_key [15:8]
> +#define MT6577_SWSYSRST_KEY_SHIFT	8		// unlock_key [15:8]
> +#define MT6577_SWSYSRST_KEY		0x15
> +
>  #define MT6589_WDT_MODE_KEY_SHIFT	24		// unlock_key [31:24]
>  #define MT6589_SWSYSRST_KEY_SHIFT	24		// unlock_key [31:24]
>  #define MT6589_SWSYSRST_KEY		0x88
> @@ -94,6 +98,13 @@ static const struct mtk_wdt_data mt2712_data = {
>  	.wdt_swsys_rst_key =		MT2712_SWSYSRST_KEY,
>  };
>  
> +static const struct mtk_wdt_data mt6577_data = {
> +	.toprgu_sw_rst_num =		-1,
> +	.wdt_mode_key_shift =		MT6577_WDT_MODE_KEY_SHIFT,
> +	.wdt_swsys_rst_key_shift =	MT6577_SWSYSRST_KEY_SHIFT,
> +	.wdt_swsys_rst_key =		MT6577_SWSYSRST_KEY,
> +};
> +
>  static const struct mtk_wdt_data mt6589_data = {
>  	.toprgu_sw_rst_num =		-1,
>  	.wdt_mode_key_shift =		MT6589_WDT_MODE_KEY_SHIFT,
> @@ -376,6 +387,7 @@ static int mtk_wdt_resume(struct device *dev)
>  
>  static const struct of_device_id mtk_wdt_dt_ids[] = {
>  	{ .compatible = "mediatek,mt2712-wdt", .data = &mt2712_data },
> +	{ .compatible = "mediatek,mt6577-wdt", .data = &mt6577_data },
>  	{ .compatible = "mediatek,mt6589-wdt", .data = &mt6589_data },
>  	{ .compatible = "mediatek,mt8183-wdt", .data = &mt8183_data },
>  	{ .compatible = "mediatek,mt8192-wdt", .data = &mt8192_data },
> -- 
> 2.20.1
>