linux-kernel - Re: [PATCH v1 2/2] arm64: dts: exynos8895: Add syscon-poweroff and syscon-reboot nodes

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Message-ID: <e5a847f7-5e63-4860-8b4a-dfa378989c57@gmail.com>
Date: Tue, 10 Dec 2024 23:28:25 +0200
From: Ivaylo Ivanov <ivo.ivanov.ivanov1@...il.com>
To: Markuss Broks <markuss.broks@...il.com>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Alim Akhtar <alim.akhtar@...sung.com>
Cc: linux-samsung-soc@...r.kernel.org, devicetree@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 2/2] arm64: dts: exynos8895: Add syscon-poweroff and
 syscon-reboot nodes

On 12/10/24 23:10, Markuss Broks wrote:
> Hi,
>
> On 12/10/24 8:02 PM, Ivaylo Ivanov wrote:
>> For Exynos8895, a reboot is handled by setting the bit(SWRESET_SYSTEM[1])
>> of SWRESET register(PMU + 0x400) and power-off is handled by setting
>> bit(DATA[8]) of PS_HOLD_CONTROL register (PMU + 0x330c).
>>
>> Tested using "reboot" and "poweroff -p" commands.
>>
>> Signed-off-by: Ivaylo Ivanov <ivo.ivanov.ivanov1@...il.com>
>> ---
>>   arch/arm64/boot/dts/exynos/exynos8895.dtsi | 15 +++++++++++++++
>>   1 file changed, 15 insertions(+)
>>
>> diff --git a/arch/arm64/boot/dts/exynos/exynos8895.dtsi b/arch/arm64/boot/dts/exynos/exynos8895.dtsi
>> index 90b318b2f..9eb89dd19 100644
>> --- a/arch/arm64/boot/dts/exynos/exynos8895.dtsi
>> +++ b/arch/arm64/boot/dts/exynos/exynos8895.dtsi
>> @@ -388,6 +388,21 @@ pmu_system_controller: system-controller@...80000 {
>>               compatible = "samsung,exynos8895-pmu",
>>                        "samsung,exynos7-pmu", "syscon";
>>               reg = <0x16480000 0x10000>;
>> +
>> +            poweroff: syscon-poweroff {
>> +                compatible = "syscon-poweroff";
>> +                regmap = <&pmu_system_controller>;
>> +                offset = <0x330c>; /* PS_HOLD_CONTROL */
>> +                mask = <0x100>; /* reset value */
>> +            };
>> +
>> +            reboot: syscon-reboot {
>> +                compatible = "syscon-reboot";
>> +                regmap = <&pmu_system_controller>;
>> +                offset = <0x400>; /* SWRESET */
>> +                mask = <0x1>; /* SWRESET_SYSTEM */
>> +                value = <0x1>; /* reset value */
>> +            };
>>           };
> Aren't those already included with arm/samsung/exynos-syscon-restart.dtsi? I can see that the values for poweroff are different here though, does it not work with the value from exynos-syscon-restart?

Riiight... seems like I've completely omitted that during testing.
Although the poweroff mask should be different, it's meant to set
BIT 8. I'll check it tomorrow and send a v2.

Thanks!
Best regards, Ivo.

>>             pinctrl_alive: pinctrl@...b0000 {
>
>
> - Markuss
>