* Re: [PATCH v5 2/2] watchdog: mtk_wdt: mt8183: Add reset controller
@ 2019-11-25 6:16 Guenter Roeck
2019-11-25 9:51 ` Philipp Zabel
2019-11-29 10:39 ` Yong Liang
0 siblings, 2 replies; 8+ messages in thread
From: Guenter Roeck @ 2019-11-25 6:16 UTC (permalink / raw)
To: Jiaxin Yu
Cc: mark.rutland, alsa-devel, yong.liang, lgirdwood, robh+dt, perex,
tzungbi, broonie, linux-mediatek, p.zabel, eason.yen,
yingjoe.chen, wim, linux-arm-kernel
On Mon, Nov 25, 2019 at 11:03:50AM +0800, Jiaxin Yu wrote:
> From: "yong.liang" <yong.liang@mediatek.com>
>
> Add reset controller API in watchdog driver.
> Besides watchdog, MTK toprgu module also provide sub-system (eg, audio,
> camera, codec and connectivity) software reset functionality.
>
> Signed-off-by: yong.liang <yong.liang@mediatek.com>
> Signed-off-by: jiaxin.yu <jiaxin.yu@mediatek.com>
> Reviewed-by: Yingjoe Chen <yingjoe.chen@mediatek.com>
> ---
> drivers/watchdog/Kconfig | 1 +
> drivers/watchdog/mtk_wdt.c | 111 ++++++++++++++++++++++++++++++++++++-
> 2 files changed, 111 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..d29484c7940a 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 +61,99 @@ 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 sw_rst_num;
> };
>
> +static const struct mtk_wdt_data mt2712_data = {
> + .sw_rst_num = MT2712_TOPRGU_SW_RST_NUM,
> +};
> +
> +static const struct mtk_wdt_data mt8183_data = {
> + .sw_rst_num = MT8183_TOPRGU_SW_RST_NUM,
> +};
The number of resets can be set in .data directly; there is no need
for the structures.
> +
> +static int toprgu_reset_assert(struct reset_controller_dev *rcdev,
> + unsigned long id)
> +{
> + 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 = __raw_readl(data->wdt_base + WDT_SWSYSRST);
> + 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_deassert(struct reset_controller_dev *rcdev,
> + unsigned long id)
> +{
> + 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 = __raw_readl(data->wdt_base + WDT_SWSYSRST);
> + tmp &= ~BIT(id);
> + tmp |= WDT_SWSYS_RST_KEY;
> + writel(tmp, data->wdt_base + WDT_SWSYSRST);
> +
> + spin_unlock_irqrestore(&data->lock, flags);
> +
> + return 0;
> +}
There is a lot of duplication in those functions. Only one line
is different. I think this is a good example where a helper function
with an additional argument indicating set or reset would be helpful.
> +
> +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 = reset_controller_register(&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 +254,7 @@ 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 +290,13 @@ 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->sw_rst_num);
> + if (err)
> + return err;
If this happens, the user will wonder why there was a message "Watchdog
enabled", but there is no watchdog. It would be better to call this
function before the dev_info() above.
Guenter
> + }
> return 0;
> }
>
> @@ -218,7 +325,9 @@ 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
_______________________________________________
Linux-mediatek mailing list
Linux-mediatek@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-mediatek
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [PATCH v5 2/2] watchdog: mtk_wdt: mt8183: Add reset controller
2019-11-25 6:16 [PATCH v5 2/2] watchdog: mtk_wdt: mt8183: Add reset controller Guenter Roeck
@ 2019-11-25 9:51 ` Philipp Zabel
2019-11-29 8:36 ` Yong Liang
2019-11-29 10:39 ` Yong Liang
1 sibling, 1 reply; 8+ messages in thread
From: Philipp Zabel @ 2019-11-25 9:51 UTC (permalink / raw)
To: Guenter Roeck, Jiaxin Yu
Cc: mark.rutland, alsa-devel, yong.liang, lgirdwood, robh+dt, perex,
tzungbi, broonie, linux-mediatek, eason.yen, yingjoe.chen, wim,
linux-arm-kernel
Hi,
On Sun, 2019-11-24 at 22:16 -0800, Guenter Roeck wrote:
> On Mon, Nov 25, 2019 at 11:03:50AM +0800, Jiaxin Yu wrote:
> > From: "yong.liang" <yong.liang@mediatek.com>
> >
> > Add reset controller API in watchdog driver.
> > Besides watchdog, MTK toprgu module also provide sub-system (eg, audio,
> > camera, codec and connectivity) software reset functionality.
> >
> > Signed-off-by: yong.liang <yong.liang@mediatek.com>
> > Signed-off-by: jiaxin.yu <jiaxin.yu@mediatek.com>
> > Reviewed-by: Yingjoe Chen <yingjoe.chen@mediatek.com>
> > ---
> > drivers/watchdog/Kconfig | 1 +
> > drivers/watchdog/mtk_wdt.c | 111 ++++++++++++++++++++++++++++++++++++-
> > 2 files changed, 111 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..d29484c7940a 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 +61,99 @@ 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 sw_rst_num;
> > };
> >
> > +static const struct mtk_wdt_data mt2712_data = {
> > + .sw_rst_num = MT2712_TOPRGU_SW_RST_NUM,
> > +};
> > +
> > +static const struct mtk_wdt_data mt8183_data = {
> > + .sw_rst_num = MT8183_TOPRGU_SW_RST_NUM,
> > +};
>
> The number of resets can be set in .data directly; there is no need
> for the structures.
>
> > +
> > +static int toprgu_reset_assert(struct reset_controller_dev *rcdev,
> > + unsigned long id)
> > +{
> > + 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 = __raw_readl(data->wdt_base + WDT_SWSYSRST);
I think this should be readl_relaxed() instead. I don't expect this
driver will ever be used on a big-endian architecture, but mixing
__raw_readl() and writel() does look dangerous.
> > + 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_deassert(struct reset_controller_dev *rcdev,
> > + unsigned long id)
> > +{
> > + 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 = __raw_readl(data->wdt_base + WDT_SWSYSRST);
> > + tmp &= ~BIT(id);
> > + tmp |= WDT_SWSYS_RST_KEY;
> > + writel(tmp, data->wdt_base + WDT_SWSYSRST);
> > +
> > + spin_unlock_irqrestore(&data->lock, flags);
> > +
> > + return 0;
> > +}
>
> There is a lot of duplication in those functions. Only one line
> is different. I think this is a good example where a helper function
> with an additional argument indicating set or reset would be helpful.
>
> > +
> > +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 = reset_controller_register(&mtk_wdt->rcdev);
I see this driver uses devm_kzalloc() below. Should this be
devm_reset_controller_register()?
> > + 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 +254,7 @@ 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);
regards
Philipp
_______________________________________________
Linux-mediatek mailing list
Linux-mediatek@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-mediatek
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [PATCH v5 2/2] watchdog: mtk_wdt: mt8183: Add reset controller
2019-11-25 9:51 ` Philipp Zabel
@ 2019-11-29 8:36 ` Yong Liang
2019-12-02 13:02 ` Philipp Zabel
0 siblings, 1 reply; 8+ messages in thread
From: Yong Liang @ 2019-11-29 8:36 UTC (permalink / raw)
To: Philipp Zabel
Cc: mark.rutland, alsa-devel, broonie, lgirdwood,
Jiaxin Yu (俞家鑫),
perex, tzungbi, robh+dt, linux-mediatek, linux-arm-kernel,
Eason Yen (顏廷任),
Yingjoe Chen (陳英洲),
wim, Guenter Roeck
On Mon, 2019-11-25 at 17:51 +0800, Philipp Zabel wrote:
> Hi,
>
> On Sun, 2019-11-24 at 22:16 -0800, Guenter Roeck wrote:
> > On Mon, Nov 25, 2019 at 11:03:50AM +0800, Jiaxin Yu wrote:
> > > From: "yong.liang" <yong.liang@mediatek.com>
> > >
> > > Add reset controller API in watchdog driver.
> > > Besides watchdog, MTK toprgu module also provide sub-system (eg, audio,
> > > camera, codec and connectivity) software reset functionality.
> > >
> > > Signed-off-by: yong.liang <yong.liang@mediatek.com>
> > > Signed-off-by: jiaxin.yu <jiaxin.yu@mediatek.com>
> > > Reviewed-by: Yingjoe Chen <yingjoe.chen@mediatek.com>
> > > ---
> > > drivers/watchdog/Kconfig | 1 +
> > > drivers/watchdog/mtk_wdt.c | 111 ++++++++++++++++++++++++++++++++++++-
> > > 2 files changed, 111 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..d29484c7940a 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 +61,99 @@ 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 sw_rst_num;
> > > };
> > >
> > > +static const struct mtk_wdt_data mt2712_data = {
> > > + .sw_rst_num = MT2712_TOPRGU_SW_RST_NUM,
> > > +};
> > > +
> > > +static const struct mtk_wdt_data mt8183_data = {
> > > + .sw_rst_num = MT8183_TOPRGU_SW_RST_NUM,
> > > +};
> >
> > The number of resets can be set in .data directly; there is no need
> > for the structures.
We want to put all properities in mtxxxx-resets.h and it easy to
manager. If there are new properity in the feture, we can put it in
mtk_wdt_data mtxxxx_data
> >
> > > +
> > > +static int toprgu_reset_assert(struct reset_controller_dev *rcdev,
> > > + unsigned long id)
> > > +{
> > > + 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 = __raw_readl(data->wdt_base + WDT_SWSYSRST);
>
> I think this should be readl_relaxed() instead. I don't expect this
> driver will ever be used on a big-endian architecture, but mixing
> __raw_readl() and writel() does look dangerous.
OK, I will change __raw_readl() to readl()
>
> > > + 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_deassert(struct reset_controller_dev *rcdev,
> > > + unsigned long id)
> > > +{
> > > + 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 = __raw_readl(data->wdt_base + WDT_SWSYSRST);
> > > + tmp &= ~BIT(id);
> > > + tmp |= WDT_SWSYS_RST_KEY;
> > > + writel(tmp, data->wdt_base + WDT_SWSYSRST);
> > > +
> > > + spin_unlock_irqrestore(&data->lock, flags);
> > > +
> > > + return 0;
> > > +}
> >
> > There is a lot of duplication in those functions. Only one line
> > is different. I think this is a good example where a helper function
> > with an additional argument indicating set or reset would be helpful.
> >
.assert and .dessert are two numbers of struct reset_control_ops.
I think it's better to define both of them.
> > > +
> > > +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 = reset_controller_register(&mtk_wdt->rcdev);
>
> I see this driver uses devm_kzalloc() below. Should this be
> devm_reset_controller_register()?
>
> > > + 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 +254,7 @@ 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);
>
> regards
> Philipp
>
>
> _______________________________________________
> Linux-mediatek mailing list
> Linux-mediatek@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-mediatek
_______________________________________________
Linux-mediatek mailing list
Linux-mediatek@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-mediatek
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [PATCH v5 2/2] watchdog: mtk_wdt: mt8183: Add reset controller
2019-11-25 6:16 [PATCH v5 2/2] watchdog: mtk_wdt: mt8183: Add reset controller Guenter Roeck
2019-11-25 9:51 ` Philipp Zabel
@ 2019-11-29 10:39 ` Yong Liang
1 sibling, 0 replies; 8+ messages in thread
From: Yong Liang @ 2019-11-29 10:39 UTC (permalink / raw)
To: Guenter Roeck
Cc: mark.rutland, alsa-devel, lgirdwood, robh+dt, perex, tzungbi,
broonie, linux-mediatek, Jiaxin Yu (俞家鑫),
p.zabel, Eason Yen (顏廷任),
Yingjoe Chen (陳英洲),
wim, linux-arm-kernel
On Mon, 2019-11-25 at 14:16 +0800, Guenter Roeck wrote:
> On Mon, Nov 25, 2019 at 11:03:50AM +0800, Jiaxin Yu wrote:
> > From: "yong.liang" <yong.liang@mediatek.com>
> >
> > Add reset controller API in watchdog driver.
> > Besides watchdog, MTK toprgu module also provide sub-system (eg, audio,
> > camera, codec and connectivity) software reset functionality.
> >
> > Signed-off-by: yong.liang <yong.liang@mediatek.com>
> > Signed-off-by: jiaxin.yu <jiaxin.yu@mediatek.com>
> > Reviewed-by: Yingjoe Chen <yingjoe.chen@mediatek.com>
> > ---
> > drivers/watchdog/Kconfig | 1 +
> > drivers/watchdog/mtk_wdt.c | 111 ++++++++++++++++++++++++++++++++++++-
> > 2 files changed, 111 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..d29484c7940a 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 +61,99 @@ 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 sw_rst_num;
> > };
> >
> > +static const struct mtk_wdt_data mt2712_data = {
> > + .sw_rst_num = MT2712_TOPRGU_SW_RST_NUM,
> > +};
> > +
> > +static const struct mtk_wdt_data mt8183_data = {
> > + .sw_rst_num = MT8183_TOPRGU_SW_RST_NUM,
> > +};
>
> The number of resets can be set in .data directly; there is no need
> for the structures.
>
> > +
> > +static int toprgu_reset_assert(struct reset_controller_dev *rcdev,
> > + unsigned long id)
> > +{
> > + 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 = __raw_readl(data->wdt_base + WDT_SWSYSRST);
> > + 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_deassert(struct reset_controller_dev *rcdev,
> > + unsigned long id)
> > +{
> > + 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 = __raw_readl(data->wdt_base + WDT_SWSYSRST);
> > + tmp &= ~BIT(id);
> > + tmp |= WDT_SWSYS_RST_KEY;
> > + writel(tmp, data->wdt_base + WDT_SWSYSRST);
> > +
> > + spin_unlock_irqrestore(&data->lock, flags);
> > +
> > + return 0;
> > +}
>
> There is a lot of duplication in those functions. Only one line
> is different. I think this is a good example where a helper function
> with an additional argument indicating set or reset would be helpful.
>
> > +
> > +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 = reset_controller_register(&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 +254,7 @@ 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 +290,13 @@ 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->sw_rst_num);
> > + if (err)
> > + return err;
>
> If this happens, the user will wonder why there was a message "Watchdog
> enabled", but there is no watchdog. It would be better to call this
> function before the dev_info() above.
>
> Guenter
It will return err just if .compatible has no .data value, just like
"mediatek,mt6589-wdt". Bus watchdog is still enable.
>
> > + }
> > return 0;
> > }
> >
> > @@ -218,7 +325,9 @@ 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
_______________________________________________
Linux-mediatek mailing list
Linux-mediatek@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-mediatek
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [PATCH v5 2/2] watchdog: mtk_wdt: mt8183: Add reset controller
2019-11-29 8:36 ` Yong Liang
@ 2019-12-02 13:02 ` Philipp Zabel
2019-12-03 3:02 ` Yong Liang
0 siblings, 1 reply; 8+ messages in thread
From: Philipp Zabel @ 2019-12-02 13:02 UTC (permalink / raw)
To: Yong Liang
Cc: mark.rutland, alsa-devel, broonie, lgirdwood,
Jiaxin Yu (俞家鑫),
perex, tzungbi, robh+dt, linux-mediatek, linux-arm-kernel,
Eason Yen (顏廷任),
Yingjoe Chen (陳英洲),
wim, Guenter Roeck
On Fri, 2019-11-29 at 16:36 +0800, Yong Liang wrote:
> On Mon, 2019-11-25 at 17:51 +0800, Philipp Zabel wrote:
> > On Sun, 2019-11-24 at 22:16 -0800, Guenter Roeck wrote:
> > > On Mon, Nov 25, 2019 at 11:03:50AM +0800, Jiaxin Yu wrote:
> > > > From: "yong.liang" <yong.liang@mediatek.com>
> > > >
> > > > Add reset controller API in watchdog driver.
> > > > Besides watchdog, MTK toprgu module also provide sub-system (eg, audio,
> > > > camera, codec and connectivity) software reset functionality.
> > > >
> > > > Signed-off-by: yong.liang <yong.liang@mediatek.com>
> > > > Signed-off-by: jiaxin.yu <jiaxin.yu@mediatek.com>
> > > > Reviewed-by: Yingjoe Chen <yingjoe.chen@mediatek.com>
> > > > ---
> > > > drivers/watchdog/Kconfig | 1 +
> > > > drivers/watchdog/mtk_wdt.c | 111 ++++++++++++++++++++++++++++++++++++-
> > > > 2 files changed, 111 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..d29484c7940a 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 +61,99 @@ 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 sw_rst_num;
> > > > };
> > > >
> > > > +static const struct mtk_wdt_data mt2712_data = {
> > > > + .sw_rst_num = MT2712_TOPRGU_SW_RST_NUM,
> > > > +};
> > > > +
> > > > +static const struct mtk_wdt_data mt8183_data = {
> > > > + .sw_rst_num = MT8183_TOPRGU_SW_RST_NUM,
> > > > +};
> > >
> > > The number of resets can be set in .data directly; there is no need
> > > for the structures.
>
> We want to put all properities in mtxxxx-resets.h and it easy to
> manager. If there are new properity in the feture, we can put it in
> mtk_wdt_data mtxxxx_data
Do you expect there will be more properties in the future?
> > > > +static int toprgu_reset_deassert(struct reset_controller_dev *rcdev,
> > > > + unsigned long id)
> > > > +{
> > > > + 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 = __raw_readl(data->wdt_base + WDT_SWSYSRST);
> > > > + tmp &= ~BIT(id);
> > > > + tmp |= WDT_SWSYS_RST_KEY;
> > > > + writel(tmp, data->wdt_base + WDT_SWSYSRST);
> > > > +
> > > > + spin_unlock_irqrestore(&data->lock, flags);
> > > > +
> > > > + return 0;
> > > > +}
> > >
> > > There is a lot of duplication in those functions. Only one line
> > > is different. I think this is a good example where a helper function
> > > with an additional argument indicating set or reset would be helpful.
> > >
> .assert and .dessert are two numbers of struct reset_control_ops.
> I think it's better to define both of them.
The suggestion was to have two very short _assert and _deassert
functions that only contain a single call to a common helper function.
See the reset-a10sr.c driver for an example.
regards
Philipp
_______________________________________________
Linux-mediatek mailing list
Linux-mediatek@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-mediatek
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [PATCH v5 2/2] watchdog: mtk_wdt: mt8183: Add reset controller
2019-12-02 13:02 ` Philipp Zabel
@ 2019-12-03 3:02 ` Yong Liang
2019-12-03 5:05 ` Guenter Roeck
0 siblings, 1 reply; 8+ messages in thread
From: Yong Liang @ 2019-12-03 3:02 UTC (permalink / raw)
To: Philipp Zabel
Cc: mark.rutland, alsa-devel, robh+dt, lgirdwood,
Jiaxin Yu (俞家鑫),
perex, tzungbi, broonie, linux-mediatek, Guenter Roeck,
Eason Yen (顏廷任),
Yingjoe Chen (陳英洲),
wim, linux-arm-kernel
On Mon, 2019-12-02 at 21:02 +0800, Philipp Zabel wrote:
> On Fri, 2019-11-29 at 16:36 +0800, Yong Liang wrote:
> > On Mon, 2019-11-25 at 17:51 +0800, Philipp Zabel wrote:
> > > On Sun, 2019-11-24 at 22:16 -0800, Guenter Roeck wrote:
> > > > On Mon, Nov 25, 2019 at 11:03:50AM +0800, Jiaxin Yu wrote:
> > > > > From: "yong.liang" <yong.liang@mediatek.com>
> > > > >
> > > > > Add reset controller API in watchdog driver.
> > > > > Besides watchdog, MTK toprgu module also provide sub-system (eg, audio,
> > > > > camera, codec and connectivity) software reset functionality.
> > > > >
> > > > > Signed-off-by: yong.liang <yong.liang@mediatek.com>
> > > > > Signed-off-by: jiaxin.yu <jiaxin.yu@mediatek.com>
> > > > > Reviewed-by: Yingjoe Chen <yingjoe.chen@mediatek.com>
> > > > > ---
> > > > > drivers/watchdog/Kconfig | 1 +
> > > > > drivers/watchdog/mtk_wdt.c | 111 ++++++++++++++++++++++++++++++++++++-
> > > > > 2 files changed, 111 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..d29484c7940a 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 +61,99 @@ 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 sw_rst_num;
> > > > > };
> > > > >
> > > > > +static const struct mtk_wdt_data mt2712_data = {
> > > > > + .sw_rst_num = MT2712_TOPRGU_SW_RST_NUM,
> > > > > +};
> > > > > +
> > > > > +static const struct mtk_wdt_data mt8183_data = {
> > > > > + .sw_rst_num = MT8183_TOPRGU_SW_RST_NUM,
> > > > > +};
> > > >
> > > > The number of resets can be set in .data directly; there is no need
> > > > for the structures.
> >
> > We want to put all properities in mtxxxx-resets.h and it easy to
> > manager. If there are new properity in the feture, we can put it in
> > mtk_wdt_data mtxxxx_data
>
> Do you expect there will be more properties in the future?
Yes, We may put some infra reset bit and max number in mtxxxx-resets.h
>
> > > > > +static int toprgu_reset_deassert(struct reset_controller_dev *rcdev,
> > > > > + unsigned long id)
> > > > > +{
> > > > > + 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 = __raw_readl(data->wdt_base + WDT_SWSYSRST);
> > > > > + tmp &= ~BIT(id);
> > > > > + tmp |= WDT_SWSYS_RST_KEY;
> > > > > + writel(tmp, data->wdt_base + WDT_SWSYSRST);
> > > > > +
> > > > > + spin_unlock_irqrestore(&data->lock, flags);
> > > > > +
> > > > > + return 0;
> > > > > +}
> > > >
> > > > There is a lot of duplication in those functions. Only one line
> > > > is different. I think this is a good example where a helper function
> > > > with an additional argument indicating set or reset would be helpful.
> > > >
> > .assert and .dessert are two numbers of struct reset_control_ops.
> > I think it's better to define both of them.
>
> The suggestion was to have two very short _assert and _deassert
> functions that only contain a single call to a common helper function.
> See the reset-a10sr.c driver for an example.
OK. I will modify it as reset-a10sr.c do.
>
> regards
> Philipp
>
>
> _______________________________________________
> Linux-mediatek mailing list
> Linux-mediatek@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-mediatek
_______________________________________________
Linux-mediatek mailing list
Linux-mediatek@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-mediatek
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [PATCH v5 2/2] watchdog: mtk_wdt: mt8183: Add reset controller
2019-12-03 3:02 ` Yong Liang
@ 2019-12-03 5:05 ` Guenter Roeck
0 siblings, 0 replies; 8+ messages in thread
From: Guenter Roeck @ 2019-12-03 5:05 UTC (permalink / raw)
To: Yong Liang, Philipp Zabel
Cc: mark.rutland, alsa-devel, robh+dt, lgirdwood,
Jiaxin Yu (俞家鑫),
perex, tzungbi, broonie, linux-mediatek,
Eason Yen (顏廷任),
Yingjoe Chen (陳英洲),
wim, linux-arm-kernel
On 12/2/19 7:02 PM, Yong Liang wrote:
> On Mon, 2019-12-02 at 21:02 +0800, Philipp Zabel wrote:
>> On Fri, 2019-11-29 at 16:36 +0800, Yong Liang wrote:
>>> On Mon, 2019-11-25 at 17:51 +0800, Philipp Zabel wrote:
>>>> On Sun, 2019-11-24 at 22:16 -0800, Guenter Roeck wrote:
>>>>> On Mon, Nov 25, 2019 at 11:03:50AM +0800, Jiaxin Yu wrote:
>>>>>> From: "yong.liang" <yong.liang@mediatek.com>
>>>>>>
>>>>>> Add reset controller API in watchdog driver.
>>>>>> Besides watchdog, MTK toprgu module also provide sub-system (eg, audio,
>>>>>> camera, codec and connectivity) software reset functionality.
>>>>>>
>>>>>> Signed-off-by: yong.liang <yong.liang@mediatek.com>
>>>>>> Signed-off-by: jiaxin.yu <jiaxin.yu@mediatek.com>
>>>>>> Reviewed-by: Yingjoe Chen <yingjoe.chen@mediatek.com>
>>>>>> ---
>>>>>> drivers/watchdog/Kconfig | 1 +
>>>>>> drivers/watchdog/mtk_wdt.c | 111 ++++++++++++++++++++++++++++++++++++-
>>>>>> 2 files changed, 111 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..d29484c7940a 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 +61,99 @@ 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 sw_rst_num;
>>>>>> };
>>>>>>
>>>>>> +static const struct mtk_wdt_data mt2712_data = {
>>>>>> + .sw_rst_num = MT2712_TOPRGU_SW_RST_NUM,
>>>>>> +};
>>>>>> +
>>>>>> +static const struct mtk_wdt_data mt8183_data = {
>>>>>> + .sw_rst_num = MT8183_TOPRGU_SW_RST_NUM,
>>>>>> +};
>>>>>
>>>>> The number of resets can be set in .data directly; there is no need
>>>>> for the structures.
>>>
>>> We want to put all properities in mtxxxx-resets.h and it easy to
>>> manager. If there are new properity in the feture, we can put it in
>>> mtk_wdt_data mtxxxx_data
>>
>> Do you expect there will be more properties in the future?
>
> Yes, We may put some infra reset bit and max number in mtxxxx-resets.h
Please either do that now or introduce the complexity when needed.
Thanks,
Guenter
>>
>>>>>> +static int toprgu_reset_deassert(struct reset_controller_dev *rcdev,
>>>>>> + unsigned long id)
>>>>>> +{
>>>>>> + 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 = __raw_readl(data->wdt_base + WDT_SWSYSRST);
>>>>>> + tmp &= ~BIT(id);
>>>>>> + tmp |= WDT_SWSYS_RST_KEY;
>>>>>> + writel(tmp, data->wdt_base + WDT_SWSYSRST);
>>>>>> +
>>>>>> + spin_unlock_irqrestore(&data->lock, flags);
>>>>>> +
>>>>>> + return 0;
>>>>>> +}
>>>>>
>>>>> There is a lot of duplication in those functions. Only one line
>>>>> is different. I think this is a good example where a helper function
>>>>> with an additional argument indicating set or reset would be helpful.
>>>>>
>>> .assert and .dessert are two numbers of struct reset_control_ops.
>>> I think it's better to define both of them.
>>
>> The suggestion was to have two very short _assert and _deassert
>> functions that only contain a single call to a common helper function.
>> See the reset-a10sr.c driver for an example.
>
> OK. I will modify it as reset-a10sr.c do.
>>
>> regards
>> Philipp
>>
>>
>> _______________________________________________
>> Linux-mediatek mailing list
>> Linux-mediatek@lists.infradead.org
>> http://lists.infradead.org/mailman/listinfo/linux-mediatek
>
_______________________________________________
Linux-mediatek mailing list
Linux-mediatek@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-mediatek
^ permalink raw reply [flat|nested] 8+ messages in thread
* [PATCH v5 2/2] watchdog: mtk_wdt: mt8183: Add reset controller
2019-11-25 3:03 [PATCH v5 0/2] ASoC: mt8183: fix audio playback slowly after playback Jiaxin Yu
@ 2019-11-25 3:03 ` Jiaxin Yu
0 siblings, 0 replies; 8+ messages in thread
From: Jiaxin Yu @ 2019-11-25 3:03 UTC (permalink / raw)
To: broonie, mark.rutland, yingjoe.chen, p.zabel, robh+dt, linux, wim
Cc: alsa-devel, yong.liang, lgirdwood, jiaxin.yu, perex, tzungbi,
linux-mediatek, eason.yen, linux-arm-kernel
From: "yong.liang" <yong.liang@mediatek.com>
Add reset controller API in watchdog driver.
Besides watchdog, MTK toprgu module also provide sub-system (eg, audio,
camera, codec and connectivity) software reset functionality.
Signed-off-by: yong.liang <yong.liang@mediatek.com>
Signed-off-by: jiaxin.yu <jiaxin.yu@mediatek.com>
Reviewed-by: Yingjoe Chen <yingjoe.chen@mediatek.com>
---
drivers/watchdog/Kconfig | 1 +
drivers/watchdog/mtk_wdt.c | 111 ++++++++++++++++++++++++++++++++++++-
2 files changed, 111 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..d29484c7940a 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 +61,99 @@ 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 sw_rst_num;
};
+static const struct mtk_wdt_data mt2712_data = {
+ .sw_rst_num = MT2712_TOPRGU_SW_RST_NUM,
+};
+
+static const struct mtk_wdt_data mt8183_data = {
+ .sw_rst_num = MT8183_TOPRGU_SW_RST_NUM,
+};
+
+static int toprgu_reset_assert(struct reset_controller_dev *rcdev,
+ unsigned long id)
+{
+ 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 = __raw_readl(data->wdt_base + WDT_SWSYSRST);
+ 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_deassert(struct reset_controller_dev *rcdev,
+ unsigned long id)
+{
+ 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 = __raw_readl(data->wdt_base + WDT_SWSYSRST);
+ 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(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 = reset_controller_register(&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 +254,7 @@ 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 +290,13 @@ 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->sw_rst_num);
+ if (err)
+ return err;
+ }
return 0;
}
@@ -218,7 +325,9 @@ 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
_______________________________________________
Linux-mediatek mailing list
Linux-mediatek@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-mediatek
^ permalink raw reply related [flat|nested] 8+ messages in thread
end of thread, other threads:[~2019-12-03 5:05 UTC | newest]
Thread overview: 8+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2019-11-25 6:16 [PATCH v5 2/2] watchdog: mtk_wdt: mt8183: Add reset controller Guenter Roeck
2019-11-25 9:51 ` Philipp Zabel
2019-11-29 8:36 ` Yong Liang
2019-12-02 13:02 ` Philipp Zabel
2019-12-03 3:02 ` Yong Liang
2019-12-03 5:05 ` Guenter Roeck
2019-11-29 10:39 ` Yong Liang
-- strict thread matches above, loose matches on Subject: below --
2019-11-25 3:03 [PATCH v5 0/2] ASoC: mt8183: fix audio playback slowly after playback Jiaxin Yu
2019-11-25 3:03 ` [PATCH v5 2/2] watchdog: mtk_wdt: mt8183: Add reset controller Jiaxin Yu
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).