Commit a224764f authored by Allen-KH Cheng's avatar Allen-KH Cheng Committed by Wim Van Sebroeck
Browse files

watchdog: mtk_wdt: Add reset_by_toprgu support 



In some cases, the MediaTek watchdog requires the TOPRGU to reset
timer after system resets.

Provide a reset_by_toprgu parameter for configuration.

Signed-off-by: default avatarAllen-KH Cheng <allen-kh.cheng@mediatek.com>
Reviewed-by: default avatarAngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: default avatarGuenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20230117014023.2993-3-allen-kh.cheng@mediatek.com


Signed-off-by: default avatarGuenter Roeck <linux@roeck-us.net>
Signed-off-by: default avatarWim Van Sebroeck <wim@linux-watchdog.org>
parent 9b30eac1

drivers/watchdog/mtk_wdt.c

+7 −0
Original line number Diff line number Diff line
@@ -50,6 +50,7 @@ 
#define WDT_MODE_IRQ_EN		(1 << 3)

#define WDT_MODE_AUTO_START	(1 << 4)

#define WDT_MODE_DUAL_EN	(1 << 6)

#define WDT_MODE_CNT_SEL	(1 << 8)

#define WDT_MODE_KEY		0x22000000



#define WDT_SWRST		0x14
@@ -70,6 +71,7 @@ struct mtk_wdt_dev { 
	spinlock_t lock; /* protects WDT_SWSYSRST reg */

	struct reset_controller_dev rcdev;

	bool disable_wdt_extrst;

	bool reset_by_toprgu;

};



struct mtk_wdt_data {
@@ -279,6 +281,8 @@ static int mtk_wdt_start(struct watchdog_device *wdt_dev) 
		reg &= ~(WDT_MODE_IRQ_EN | WDT_MODE_DUAL_EN);

	if (mtk_wdt->disable_wdt_extrst)

		reg &= ~WDT_MODE_EXRST_EN;

	if (mtk_wdt->reset_by_toprgu)

		reg |= WDT_MODE_CNT_SEL;

	reg |= (WDT_MODE_EN | WDT_MODE_KEY);

	iowrite32(reg, wdt_base + WDT_MODE);
@@ -408,6 +412,9 @@ static int mtk_wdt_probe(struct platform_device *pdev) 
	mtk_wdt->disable_wdt_extrst =

		of_property_read_bool(dev->of_node, "mediatek,disable-extrst");



	mtk_wdt->reset_by_toprgu =

		of_property_read_bool(dev->of_node, "mediatek,reset-by-toprgu");



	return 0;

}