Commit 2fcaaf15 authored by Herve Codina (Schneider Electric)'s avatar Herve Codina (Schneider Electric) Committed by Geert Uytterhoeven
Browse files

clk: renesas: r9a06g032: Enable watchdog reset sources 



The watchdog timeout is signaled using an interrupt and, on this
interrupt, a software initiated reset is performed.

This software initiated reset performs, in the end, a hardware system
reset using SWRST_REQ of RSTCTRL register.

The watchdog itself is able to control directly the hardware system
reset without any operation done by the interrupt handler. This feature
allows the watchdog to not depend on the software to reset the system
when a watchdog timeout occurs.

Indeed, when the watchdog timeout occurs, the watchdog requests a system
reset using its own hardware dedicated line but this reset source is
disabled at the reset controller level.

To benefit of this feature and be robust against software issues, enable
watchdogs reset sources.

Suggested-by: default avatarWolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: default avatarHerve Codina (Schneider Electric) <herve.codina@bootlin.com>
Reviewed-by: default avatarWolfram Sang <wsa+renesas@sang-engineering.com>
Tested-by: default avatarWolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: default avatarGeert Uytterhoeven <geert+renesas@glider.be>
Link: https://patch.msgid.link/20260324120435.243641-2-herve.codina@bootlin.com


Signed-off-by: default avatarGeert Uytterhoeven <geert+renesas@glider.be>
parent 0e590f4d

drivers/clk/renesas/r9a06g032-clocks.c

+3 −2
Original line number Diff line number Diff line
@@ -1342,8 +1342,9 @@ static int __init r9a06g032_clocks_probe(struct platform_device *pdev) 
	/* Clear potentially pending resets */

	writel(R9A06G032_SYSCTRL_WDA7RST_0 | R9A06G032_SYSCTRL_WDA7RST_1,

	       clocks->reg + R9A06G032_SYSCTRL_RSTCTRL);

	/* Allow software reset */

	writel(R9A06G032_SYSCTRL_SWRST | R9A06G032_SYSCTRL_RSTEN_MRESET_EN,

	/* Allow watchdog and software resets */

	writel(R9A06G032_SYSCTRL_WDA7RST_0 | R9A06G032_SYSCTRL_WDA7RST_1 |

	       R9A06G032_SYSCTRL_SWRST | R9A06G032_SYSCTRL_RSTEN_MRESET_EN,

	       clocks->reg + R9A06G032_SYSCTRL_RSTEN);



	error = devm_register_sys_off_handler(dev, SYS_OFF_MODE_RESTART, SYS_OFF_PRIO_HIGH,