[PATCH v6 0/2] ASoC: mt8183: fix audio playback slowly after playback

[PATCH v6 0/2] ASoC: mt8183: fix audio playback slowly after playback

[Jiaxin Yu]

From: "yong.liang" <yong.liang@mediatek.com>

This series patches add reset controller for MT8183, and audio will use it in 
machine driver during bootup, they depend on the for-next.

v6 changes:
	1. Simplify toprug_reset_assert() & toprug_reset_deassert().
	2. Add members for mt2712_data & mt8183_data.

v5 changes:
	1. Add Signed-off-by tag and Reviewed-by tag.

v4 changes:
	1. Fixed wrong signed-off as correct mail suffix.
	2. Fixed patch subject that add patch version.

v3 changes:
	1. https://patchwork.kernel.org/patch/11164283/ and 
	   https://patchwork.kernel.org/patch/11164305/ has been merged.
	2. Change the name of mtk_wdt_compatible to mtk_wdt_data.
	3. Remove toprgu_reset struct and use mtk_wdt_dev instead.
	4. Get the value of sw_rst_num from .h file.
	5. Adddd mt2712-resets.h for mt2712.
	6. Improve commit message.

v2 changes:
	1. remove "WIP" that in the title of patches
	2. add hyper link for the patch that depends on
	3. patchwork list:
		https://patchwork.kernel.org/cover/11164285/
		https://patchwork.kernel.org/patch/11164295/
		https://patchwork.kernel.org/patch/11164299/
		https://patchwork.kernel.org/patch/11164283/
		https://patchwork.kernel.org/patch/11164305/

v1 changes:
	1. patchwork list:
		https://patchwork.kernel.org/cover/11164173/
		https://patchwork.kernel.org/patch/11164181/
		https://patchwork.kernel.org/patch/11164185/
		https://patchwork.kernel.org/patch/11164187/
		https://patchwork.kernel.org/patch/11164175/

yong.liang (2):
  arm64: dts: mt8183: Add reset-cells in infracfg
  clk: reset: Modify reset-controller driver

 .../devicetree/bindings/watchdog/mtk-wdt.txt  |  10 +-
 drivers/watchdog/Kconfig                      |   1 +
 drivers/watchdog/mtk_wdt.c                    | 109 +++++++++++++++++-
 .../reset-controller/mt2712-resets.h          |  22 ++++
 .../reset-controller/mt8183-resets.h          |  17 +++
 5 files changed, 155 insertions(+), 4 deletions(-)
 create mode 100644 include/dt-bindings/reset-controller/mt2712-resets.h

-- 
2.18.0

[PATCH v6 1/2] dt-bindings: mediatek: mt8183: Add #reset-cells

[Jiaxin Yu]

From: "yong.liang" <yong.liang@mediatek.com>

Add #reset-cells property and update example

Signed-off-by: yong.liang <yong.liang@mediatek.com>
---
 .../devicetree/bindings/watchdog/mtk-wdt.txt  | 10 ++++++---
 .../reset-controller/mt2712-resets.h          | 22 +++++++++++++++++++
 .../reset-controller/mt8183-resets.h          | 17 ++++++++++++++
 3 files changed, 46 insertions(+), 3 deletions(-)
 create mode 100644 include/dt-bindings/reset-controller/mt2712-resets.h

diff --git a/Documentation/devicetree/bindings/watchdog/mtk-wdt.txt b/Documentation/devicetree/bindings/watchdog/mtk-wdt.txt
index 92181b648f52..5a76ac262f8d 100644
--- a/Documentation/devicetree/bindings/watchdog/mtk-wdt.txt
+++ b/Documentation/devicetree/bindings/watchdog/mtk-wdt.txt
@@ -4,6 +4,7 @@ Required properties:
 
 - compatible should contain:
 	"mediatek,mt2701-wdt", "mediatek,mt6589-wdt": for MT2701
+	"mediatek,mt2712-wdt", "mediatek,mt6589-wdt": for MT2712
 	"mediatek,mt6589-wdt": for MT6589
 	"mediatek,mt6797-wdt", "mediatek,mt6589-wdt": for MT6797
 	"mediatek,mt7622-wdt", "mediatek,mt6589-wdt": for MT7622
@@ -14,11 +15,14 @@ Required properties:
 
 Optional properties:
 - timeout-sec: contains the watchdog timeout in seconds.
+- #reset-cells: Should be 1.
 
 Example:
 
-wdt: watchdog@10000000 {
-	compatible = "mediatek,mt6589-wdt";
-	reg = <0x10000000 0x18>;
+watchdog: watchdog@10007000 {
+	compatible = "mediatek,mt8183-wdt",
+		     "mediatek,mt6589-wdt";
+	reg = <0 0x10007000 0 0x100>;
 	timeout-sec = <10>;
+	#reset-cells = <1>;
 };
diff --git a/include/dt-bindings/reset-controller/mt2712-resets.h b/include/dt-bindings/reset-controller/mt2712-resets.h
new file mode 100644
index 000000000000..9e7ee762f076
--- /dev/null
+++ b/include/dt-bindings/reset-controller/mt2712-resets.h
@@ -0,0 +1,22 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (c) 2019 MediaTek Inc.
+ * Author: Yong Liang <yong.liang@mediatek.com>
+ */
+
+#ifndef _DT_BINDINGS_RESET_CONTROLLER_MT2712
+#define _DT_BINDINGS_RESET_CONTROLLER_MT2712
+
+#define MT2712_TOPRGU_INFRA_SW_RST				0
+#define MT2712_TOPRGU_MM_SW_RST					1
+#define MT2712_TOPRGU_MFG_SW_RST				2
+#define MT2712_TOPRGU_VENC_SW_RST				3
+#define MT2712_TOPRGU_VDEC_SW_RST				4
+#define MT2712_TOPRGU_IMG_SW_RST				5
+#define MT2712_TOPRGU_INFRA_AO_SW_RST				8
+#define MT2712_TOPRGU_USB_SW_RST				9
+#define MT2712_TOPRGU_APMIXED_SW_RST				10
+
+#define MT2712_TOPRGU_SW_RST_NUM				11
+
+#endif  /* _DT_BINDINGS_RESET_CONTROLLER_MT2712 */
diff --git a/include/dt-bindings/reset-controller/mt8183-resets.h b/include/dt-bindings/reset-controller/mt8183-resets.h
index 8804e34ebdd4..a1bbd41e0d12 100644
--- a/include/dt-bindings/reset-controller/mt8183-resets.h
+++ b/include/dt-bindings/reset-controller/mt8183-resets.h
@@ -78,4 +78,21 @@
 #define MT8183_INFRACFG_AO_I2C7_SW_RST				126
 #define MT8183_INFRACFG_AO_I2C8_SW_RST				127
 
+#define MT8183_INFRACFG_SW_RST_NUM				128
+
+#define MT8183_TOPRGU_MM_SW_RST					1
+#define MT8183_TOPRGU_MFG_SW_RST				2
+#define MT8183_TOPRGU_VENC_SW_RST				3
+#define MT8183_TOPRGU_VDEC_SW_RST				4
+#define MT8183_TOPRGU_IMG_SW_RST				5
+#define MT8183_TOPRGU_MD_SW_RST					7
+#define MT8183_TOPRGU_CONN_SW_RST				9
+#define MT8183_TOPRGU_CONN_MCU_SW_RST				12
+#define MT8183_TOPRGU_IPU0_SW_RST				14
+#define MT8183_TOPRGU_IPU1_SW_RST				15
+#define MT8183_TOPRGU_AUDIO_SW_RST				17
+#define MT8183_TOPRGU_CAMSYS_SW_RST				18
+
+#define MT8183_TOPRGU_SW_RST_NUM				19
+
 #endif  /* _DT_BINDINGS_RESET_CONTROLLER_MT8183 */
-- 
2.18.0

[PATCH v6 2/2] watchdog: mtk_wdt: mt8183: Add reset controller

[Jiaxin Yu]

From: "yong.liang" <yong.liang@mediatek.com>

Add reset controller API in watchdog driver.
Besides watchdog, MTK toprgu module alsa provide sub-system (eg, audio,
camera, codec and connectivity) software reset functionality.

Signed-off-by: yong.liang <yong.liang@mediatek.com>
---
 drivers/watchdog/Kconfig   |   1 +
 drivers/watchdog/mtk_wdt.c | 109 ++++++++++++++++++++++++++++++++++++-
 2 files changed, 109 insertions(+), 1 deletion(-)

diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index 2e07caab9db2..629249fe5305 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -717,6 +717,7 @@ config MEDIATEK_WATCHDOG
 	tristate "Mediatek SoCs watchdog support"
 	depends on ARCH_MEDIATEK || COMPILE_TEST
 	select WATCHDOG_CORE
+	select RESET_CONTROLLER
 	help
 	  Say Y here to include support for the watchdog timer
 	  in Mediatek SoCs.
diff --git a/drivers/watchdog/mtk_wdt.c b/drivers/watchdog/mtk_wdt.c
index 9c3d0033260d..667380031dfd 100644
--- a/drivers/watchdog/mtk_wdt.c
+++ b/drivers/watchdog/mtk_wdt.c
@@ -9,6 +9,9 @@
  * Based on sunxi_wdt.c
  */
 
+#include <dt-bindings/reset-controller/mt2712-resets.h>
+#include <dt-bindings/reset-controller/mt8183-resets.h>
+#include <linux/delay.h>
 #include <linux/err.h>
 #include <linux/init.h>
 #include <linux/io.h>
@@ -16,10 +19,12 @@
 #include <linux/module.h>
 #include <linux/moduleparam.h>
 #include <linux/of.h>
+#include <linux/of_device.h>
 #include <linux/platform_device.h>
+#include <linux/reset-controller.h>
+#include <linux/slab.h>
 #include <linux/types.h>
 #include <linux/watchdog.h>
-#include <linux/delay.h>
 
 #define WDT_MAX_TIMEOUT		31
 #define WDT_MIN_TIMEOUT		1
@@ -44,6 +49,9 @@
 #define WDT_SWRST		0x14
 #define WDT_SWRST_KEY		0x1209
 
+#define WDT_SWSYSRST		0x18U
+#define WDT_SWSYS_RST_KEY	0x88000000
+
 #define DRV_NAME		"mtk-wdt"
 #define DRV_VERSION		"1.0"
 
@@ -53,8 +61,97 @@ static unsigned int timeout;
 struct mtk_wdt_dev {
 	struct watchdog_device wdt_dev;
 	void __iomem *wdt_base;
+	spinlock_t lock; /* protects WDT_SWSYSRST reg */
+	struct reset_controller_dev rcdev;
+};
+
+struct mtk_wdt_data {
+	int infracfg_sw_rst_num;
+	int toprgu_sw_rst_num;
+};
+
+static const struct mtk_wdt_data mt2712_data = {
+	.toprgu_sw_rst_num = MT2712_TOPRGU_SW_RST_NUM,
+};
+
+static const struct mtk_wdt_data mt8183_data = {
+	.infracfg_sw_rst_num = MT8183_INFRACFG_SW_RST_NUM,
+	.toprgu_sw_rst_num = MT8183_TOPRGU_SW_RST_NUM,
+};
+
+static int toprgu_reset_update(struct reset_controller_dev *rcdev,
+			       unsigned long id, bool assert)
+{
+	unsigned int tmp;
+	unsigned long flags;
+
+	struct mtk_wdt_dev *data =
+		 container_of(rcdev, struct mtk_wdt_dev, rcdev);
+
+	spin_lock_irqsave(&data->lock, flags);
+
+	tmp = readl(data->wdt_base + WDT_SWSYSRST);
+	if (assert)
+		tmp |= BIT(id);
+	else
+		tmp &= ~BIT(id);
+	tmp |= WDT_SWSYS_RST_KEY;
+	writel(tmp, data->wdt_base + WDT_SWSYSRST);
+
+	spin_unlock_irqrestore(&data->lock, flags);
+
+	return 0;
+}
+
+static int toprgu_reset_assert(struct reset_controller_dev *rcdev,
+			       unsigned long id)
+{
+	return toprgu_reset_update(rcdev, id, true);
+}
+
+static int toprgu_reset_deassert(struct reset_controller_dev *rcdev,
+				 unsigned long id)
+{
+	return toprgu_reset_update(rcdev, id, false);
+}
+
+static int toprgu_reset(struct reset_controller_dev *rcdev,
+			unsigned long id)
+{
+	int ret;
+
+	ret = toprgu_reset_assert(rcdev, id);
+	if (ret)
+		return ret;
+
+	return toprgu_reset_deassert(rcdev, id);
+}
+
+static const struct reset_control_ops toprgu_reset_ops = {
+	.assert = toprgu_reset_assert,
+	.deassert = toprgu_reset_deassert,
+	.reset = toprgu_reset,
 };
 
+static int toprgu_register_reset_controller(struct platform_device *pdev,
+					    int rst_num)
+{
+	int ret;
+	struct mtk_wdt_dev *mtk_wdt = platform_get_drvdata(pdev);
+
+	spin_lock_init(&mtk_wdt->lock);
+
+	mtk_wdt->rcdev.owner = THIS_MODULE;
+	mtk_wdt->rcdev.nr_resets = rst_num;
+	mtk_wdt->rcdev.ops = &toprgu_reset_ops;
+	mtk_wdt->rcdev.of_node = pdev->dev.of_node;
+	ret = devm_reset_controller_register(&pdev->dev, &mtk_wdt->rcdev);
+	if (ret != 0)
+		dev_err(&pdev->dev,
+			"couldn't register wdt reset controller: %d\n", ret);
+	return ret;
+}
+
 static int mtk_wdt_restart(struct watchdog_device *wdt_dev,
 			   unsigned long action, void *data)
 {
@@ -155,6 +252,7 @@ static int mtk_wdt_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct mtk_wdt_dev *mtk_wdt;
+	struct mtk_wdt_data *wdt_data;
 	int err;
 
 	mtk_wdt = devm_kzalloc(dev, sizeof(*mtk_wdt), GFP_KERNEL);
@@ -190,6 +288,13 @@ 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 = (struct mtk_wdt_data *)of_device_get_match_data(dev);
+	if (wdt_data) {
+		err = toprgu_register_reset_controller(pdev,
+						       wdt_data->toprgu_sw_rst_num);
+		if (err)
+			return err;
+	}
 	return 0;
 }
 
@@ -218,7 +323,9 @@ static int mtk_wdt_resume(struct device *dev)
 #endif
 
 static const struct of_device_id mtk_wdt_dt_ids[] = {
+	{ .compatible = "mediatek,mt2712-wdt", .data = &mt2712_data },
 	{ .compatible = "mediatek,mt6589-wdt" },
+	{ .compatible = "mediatek,mt8183-wdt", .data = &mt8183_data },
 	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, mtk_wdt_dt_ids);
-- 
2.18.0

Re: [PATCH v6 2/2] watchdog: mtk_wdt: mt8183: Add reset controller

[Philipp Zabel]

Hi,

On Thu, 2019-12-12 at 00:22 +0800, Jiaxin Yu wrote:
> From: "yong.liang" <yong.liang@mediatek.com>
> 
> Add reset controller API in watchdog driver.
> Besides watchdog, MTK toprgu module alsa provide sub-system (eg, audio,
> camera, codec and connectivity) software reset functionality.

Do any of the listed sub-systems use the reset_control_reset()
functionality? Is there no delay requirement between assert and
deassert? Otherwise it would be safer not to implement the .reset()
operation at all.

> 
> Signed-off-by: yong.liang <yong.liang@mediatek.com>
> ---
>  drivers/watchdog/Kconfig   |   1 +
>  drivers/watchdog/mtk_wdt.c | 109 ++++++++++++++++++++++++++++++++++++-
>  2 files changed, 109 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
> index 2e07caab9db2..629249fe5305 100644
> --- a/drivers/watchdog/Kconfig
> +++ b/drivers/watchdog/Kconfig
> @@ -717,6 +717,7 @@ config MEDIATEK_WATCHDOG
>  	tristate "Mediatek SoCs watchdog support"
>  	depends on ARCH_MEDIATEK || COMPILE_TEST
>  	select WATCHDOG_CORE
> +	select RESET_CONTROLLER
>  	help
>  	  Say Y here to include support for the watchdog timer
>  	  in Mediatek SoCs.
> diff --git a/drivers/watchdog/mtk_wdt.c b/drivers/watchdog/mtk_wdt.c
> index 9c3d0033260d..667380031dfd 100644
> --- a/drivers/watchdog/mtk_wdt.c
> +++ b/drivers/watchdog/mtk_wdt.c
> @@ -9,6 +9,9 @@
>   * Based on sunxi_wdt.c
>   */
>  
> +#include <dt-bindings/reset-controller/mt2712-resets.h>
> +#include <dt-bindings/reset-controller/mt8183-resets.h>
> +#include <linux/delay.h>
>  #include <linux/err.h>
>  #include <linux/init.h>
>  #include <linux/io.h>
> @@ -16,10 +19,12 @@
>  #include <linux/module.h>
>  #include <linux/moduleparam.h>
>  #include <linux/of.h>
> +#include <linux/of_device.h>
>  #include <linux/platform_device.h>
> +#include <linux/reset-controller.h>
> +#include <linux/slab.h>

What is this required for?

>  #include <linux/types.h>
>  #include <linux/watchdog.h>
> -#include <linux/delay.h>
>
>  #define WDT_MAX_TIMEOUT		31
>  #define WDT_MIN_TIMEOUT		1
> @@ -44,6 +49,9 @@
>  #define WDT_SWRST		0x14
>  #define WDT_SWRST_KEY		0x1209
>  
> +#define WDT_SWSYSRST		0x18U
> +#define WDT_SWSYS_RST_KEY	0x88000000
> +
>  #define DRV_NAME		"mtk-wdt"
>  #define DRV_VERSION		"1.0"
>  
> @@ -53,8 +61,97 @@ static unsigned int timeout;
>  struct mtk_wdt_dev {
>  	struct watchdog_device wdt_dev;
>  	void __iomem *wdt_base;
> +	spinlock_t lock; /* protects WDT_SWSYSRST reg */
> +	struct reset_controller_dev rcdev;
> +};
> +
> +struct mtk_wdt_data {
> +	int infracfg_sw_rst_num;

This is not used at all, better remove it.

> +	int toprgu_sw_rst_num;
> +};
> +
> +static const struct mtk_wdt_data mt2712_data = {
> +	.toprgu_sw_rst_num = MT2712_TOPRGU_SW_RST_NUM,
> +};
> +
> +static const struct mtk_wdt_data mt8183_data = {
> +	.infracfg_sw_rst_num = MT8183_INFRACFG_SW_RST_NUM,

Same as above.

> +	.toprgu_sw_rst_num = MT8183_TOPRGU_SW_RST_NUM,
> +};
> +
> +static int toprgu_reset_update(struct reset_controller_dev *rcdev,
> +			       unsigned long id, bool assert)
> +{
> +	unsigned int tmp;
> +	unsigned long flags;
> +

This empty line can be removed.

> +	struct mtk_wdt_dev *data =
> +		 container_of(rcdev, struct mtk_wdt_dev, rcdev);
> +
> +	spin_lock_irqsave(&data->lock, flags);
> +
> +	tmp = readl(data->wdt_base + WDT_SWSYSRST);
> +	if (assert)
> +		tmp |= BIT(id);
> +	else
> +		tmp &= ~BIT(id);
> +	tmp |= WDT_SWSYS_RST_KEY;
> +	writel(tmp, data->wdt_base + WDT_SWSYSRST);
> +
> +	spin_unlock_irqrestore(&data->lock, flags);
> +
> +	return 0;
> +}
> +
> +static int toprgu_reset_assert(struct reset_controller_dev *rcdev,
> +			       unsigned long id)
> +{
> +	return toprgu_reset_update(rcdev, id, true);
> +}
> +
> +static int toprgu_reset_deassert(struct reset_controller_dev *rcdev,
> +				 unsigned long id)
> +{
> +	return toprgu_reset_update(rcdev, id, false);
> +}
> +
> +static int toprgu_reset(struct reset_controller_dev *rcdev,
> +			unsigned long id)
> +{
> +	int ret;
> +
> +	ret = toprgu_reset_assert(rcdev, id);
> +	if (ret)
> +		return ret;
> +
> +	return toprgu_reset_deassert(rcdev, id);
> +}

As mentioned above, is this needed? Does this work for all modules?
Only implement this if you are sure both are true.

regards
Philipp

Re: [PATCH v6 1/2] dt-bindings: mediatek: mt8183: Add #reset-cells

[Rob Herring]

On Thu, 12 Dec 2019 00:22:35 +0800, Jiaxin Yu wrote:
> From: "yong.liang" <yong.liang@mediatek.com>
> 
> Add #reset-cells property and update example
> 
> Signed-off-by: yong.liang <yong.liang@mediatek.com>
> ---
>  .../devicetree/bindings/watchdog/mtk-wdt.txt  | 10 ++++++---
>  .../reset-controller/mt2712-resets.h          | 22 +++++++++++++++++++
>  .../reset-controller/mt8183-resets.h          | 17 ++++++++++++++
>  3 files changed, 46 insertions(+), 3 deletions(-)
>  create mode 100644 include/dt-bindings/reset-controller/mt2712-resets.h
> 

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

Re: [PATCH v6 2/2] watchdog: mtk_wdt: mt8183: Add reset controller

[Yong Liang]

On Thu, 2019-12-12 at 00:44 +0800, Philipp Zabel wrote:
> Hi,
> 
> On Thu, 2019-12-12 at 00:22 +0800, Jiaxin Yu wrote:
> > From: "yong.liang" <yong.liang@mediatek.com>
> > 
> > Add reset controller API in watchdog driver.
> > Besides watchdog, MTK toprgu module alsa provide sub-system (eg, audio,
> > camera, codec and connectivity) software reset functionality.
> 
> Do any of the listed sub-systems use the reset_control_reset()
> functionality? Is there no delay requirement between assert and
> deassert? Otherwise it would be safer not to implement the .reset()
> operation at all.
> 
> > Audio use this reset API to reset audio, and it works well.
    It is no need to add delay between assert and deassert.

> > Signed-off-by: yong.liang <yong.liang@mediatek.com>
> > ---
> >  drivers/watchdog/Kconfig   |   1 +
> >  drivers/watchdog/mtk_wdt.c | 109 ++++++++++++++++++++++++++++++++++++-
> >  2 files changed, 109 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
> > index 2e07caab9db2..629249fe5305 100644
> > --- a/drivers/watchdog/Kconfig
> > +++ b/drivers/watchdog/Kconfig
> > @@ -717,6 +717,7 @@ config MEDIATEK_WATCHDOG
> >  	tristate "Mediatek SoCs watchdog support"
> >  	depends on ARCH_MEDIATEK || COMPILE_TEST
> >  	select WATCHDOG_CORE
> > +	select RESET_CONTROLLER
> >  	help
> >  	  Say Y here to include support for the watchdog timer
> >  	  in Mediatek SoCs.
> > diff --git a/drivers/watchdog/mtk_wdt.c b/drivers/watchdog/mtk_wdt.c
> > index 9c3d0033260d..667380031dfd 100644
> > --- a/drivers/watchdog/mtk_wdt.c
> > +++ b/drivers/watchdog/mtk_wdt.c
> > @@ -9,6 +9,9 @@
> >   * Based on sunxi_wdt.c
> >   */
> >  
> > +#include <dt-bindings/reset-controller/mt2712-resets.h>
> > +#include <dt-bindings/reset-controller/mt8183-resets.h>
> > +#include <linux/delay.h>
> >  #include <linux/err.h>
> >  #include <linux/init.h>
> >  #include <linux/io.h>
> > @@ -16,10 +19,12 @@
> >  #include <linux/module.h>
> >  #include <linux/moduleparam.h>
> >  #include <linux/of.h>
> > +#include <linux/of_device.h>
> >  #include <linux/platform_device.h>
> > +#include <linux/reset-controller.h>
> > +#include <linux/slab.h>
> 
> What is this required for?

  It is no use. I will remove it.
> 
> >  #include <linux/types.h>
> >  #include <linux/watchdog.h>
> > -#include <linux/delay.h>
> >
> >  #define WDT_MAX_TIMEOUT		31
> >  #define WDT_MIN_TIMEOUT		1
> > @@ -44,6 +49,9 @@
> >  #define WDT_SWRST		0x14
> >  #define WDT_SWRST_KEY		0x1209
> >  
> > +#define WDT_SWSYSRST		0x18U
> > +#define WDT_SWSYS_RST_KEY	0x88000000
> > +
> >  #define DRV_NAME		"mtk-wdt"
> >  #define DRV_VERSION		"1.0"
> >  
> > @@ -53,8 +61,97 @@ static unsigned int timeout;
> >  struct mtk_wdt_dev {
> >  	struct watchdog_device wdt_dev;
> >  	void __iomem *wdt_base;
> > +	spinlock_t lock; /* protects WDT_SWSYSRST reg */
> > +	struct reset_controller_dev rcdev;
> > +};
> > +
> > +struct mtk_wdt_data {
> > +	int infracfg_sw_rst_num;
> 
> This is not used at all, better remove it.
  I will remove it.
> 
> > +	int toprgu_sw_rst_num;
> > +};
> > +
> > +static const struct mtk_wdt_data mt2712_data = {
> > +	.toprgu_sw_rst_num = MT2712_TOPRGU_SW_RST_NUM,
> > +};
> > +
> > +static const struct mtk_wdt_data mt8183_data = {
> > +	.infracfg_sw_rst_num = MT8183_INFRACFG_SW_RST_NUM,
> 
> Same as above.
  I will remove it.
> 
> > +	.toprgu_sw_rst_num = MT8183_TOPRGU_SW_RST_NUM,
> > +};
> > +
> > +static int toprgu_reset_update(struct reset_controller_dev *rcdev,
> > +			       unsigned long id, bool assert)
> > +{
> > +	unsigned int tmp;
> > +	unsigned long flags;
> > +
> 
> This empty line can be removed.
  I will remove it.
> 
> > +	struct mtk_wdt_dev *data =
> > +		 container_of(rcdev, struct mtk_wdt_dev, rcdev);
> > +
> > +	spin_lock_irqsave(&data->lock, flags);
> > +
> > +	tmp = readl(data->wdt_base + WDT_SWSYSRST);
> > +	if (assert)
> > +		tmp |= BIT(id);
> > +	else
> > +		tmp &= ~BIT(id);
> > +	tmp |= WDT_SWSYS_RST_KEY;
> > +	writel(tmp, data->wdt_base + WDT_SWSYSRST);
> > +
> > +	spin_unlock_irqrestore(&data->lock, flags);
> > +
> > +	return 0;
> > +}
> > +
> > +static int toprgu_reset_assert(struct reset_controller_dev *rcdev,
> > +			       unsigned long id)
> > +{
> > +	return toprgu_reset_update(rcdev, id, true);
> > +}
> > +
> > +static int toprgu_reset_deassert(struct reset_controller_dev *rcdev,
> > +				 unsigned long id)
> > +{
> > +	return toprgu_reset_update(rcdev, id, false);
> > +}
> > +
> > +static int toprgu_reset(struct reset_controller_dev *rcdev,
> > +			unsigned long id)
> > +{
> > +	int ret;
> > +
> > +	ret = toprgu_reset_assert(rcdev, id);
> > +	if (ret)
> > +		return ret;
> > +
> > +	return toprgu_reset_deassert(rcdev, id);
> > +}
> 
> As mentioned above, is this needed? Does this work for all modules?
> Only implement this if you are sure both are true.
  I think it's safe. Many modules has used it in MTK inside.
> 
> regards
> Philipp
>