linux-kernel - Re: [PATCH 1/2] arm: dts: bcm5301x: Add syscon based reboot in DT

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Date:	Tue, 28 Jun 2016 18:28:55 -0400
From:	Jon Mason <jon.mason@...adcom.com>
To:	Scott Branden <scott.branden@...adcom.com>
Cc:	Arnd Bergmann <arnd@...db.de>,
	Florian Fainelli <f.fainelli@...il.com>,
	BCM Kernel Feedback <bcm-kernel-feedback-list@...adcom.com>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	linux-kernel@...r.kernel.org, Jon Mason <jonmason@...adcom.com>
Subject: Re: [PATCH 1/2] arm: dts: bcm5301x: Add syscon based reboot in DT

On Tue, Jun 28, 2016 at 6:13 PM, Scott Branden
<scott.branden@...adcom.com> wrote:
>
>
> On 16-06-28 03:10 PM, Jon Mason wrote:
>>
>> From: Jon Mason <jonmason@...adcom.com>
>>
>> Add the ability to reboot via a reset of the processor.  This is
>> achieved via a write of 0x39 to the CRU Reset Register.  Unfortunately,
>> this only resets the core and not the other IP blocks.  So if possible,
>> other methods should be used on the individual boards.
>
> Is it possible to force a watchdog reset instead for reboot?

There is a "Power Watchdog" in both NS and NSP (and possibly others).
This isn't a working driver to test, but it might be possible to use
that to reset the system if the syscon and a unique NS/NSP reset
driver are not acceptable solutions.

>>
>> Signed-off-by: Jon Mason <jonmason@...adcom.com>
>> ---
>>   arch/arm/boot/dts/bcm5301x.dtsi | 12 ++++++++++++
>>   1 file changed, 12 insertions(+)
>>
>> diff --git a/arch/arm/boot/dts/bcm5301x.dtsi
>> b/arch/arm/boot/dts/bcm5301x.dtsi
>> index 7d4d29b..f878d0d 100644
>> --- a/arch/arm/boot/dts/bcm5301x.dtsi
>> +++ b/arch/arm/boot/dts/bcm5301x.dtsi
>> @@ -260,6 +260,18 @@
>>                                      "sata2";
>>         };
>>
>> +       cru: system-controller@...0c184 {
>> +               compatible = "brcm,bcm53010-cru", "syscon";
>> +               reg = <0x1800c184 0x4>;
>> +       };
>> +
>> +       reboot@...0c184 {
>> +               compatible ="syscon-reboot";
>> +               regmap = <&cru>;
>> +               offset = <0>;
>> +               mask = <0x39>;
>> +       };
>> +
>>         nand: nand@...28000 {
>>                 compatible = "brcm,nand-iproc", "brcm,brcmnand-v6.1",
>> "brcm,brcmnand";
>>                 reg = <0x18028000 0x600>, <0x1811a408 0x600>, <0x18028f00
>> 0x20>;
>>
>