[PATCH v4 0/5] Allwinner H6 watchdog support

[PATCH v4 0/5] Allwinner H6 watchdog support

[Clément Péron]

Hi,

Allwinner H6 SoC has two watchdogs.

As we are not sure that both A64 and H6 are stricly identical, I have
introduced the H6 bindings.

After investigation it seems that on some boards the first watchdog doesn't
make it properly reboot. Please see details in the commit log.

I think it's proper to add it with a comment anyway.

The r_watchdog is still available and usable on all the H6 boards.

Thanks,
Clément

Changes since v3:
 - Remove A64 compatible
 - Introduce specific bindings for r-wdt

Changes since v2:
 - Reintroduce H6 bindings
 - Add watchdog Maintainters / ML
 - Add Martin Ayotte test results

Changes since v1:
 - Use A64 compatible instead of H6
 - Remove dt-bindings patch
 - Change watchdog status to disabled
 - Add r_watchdog node patch
 - Add enable sunxi watchdog patch

Clément Péron (5):
  dt-bindings: watchdog: add Allwinner H6 watchdog
  arm64: dts: allwinner: h6: add watchdog node
  dt-bindings: watchdog: add Allwinner H6 r_watchdog
  arm64: dts: allwinner: h6: add r_watchog node
  arm64: defconfig: enable sunxi watchdog

 .../devicetree/bindings/watchdog/sunxi-wdt.txt   |  2 ++
 arch/arm64/boot/dts/allwinner/sun50i-h6.dtsi     | 16 ++++++++++++++++
 arch/arm64/configs/defconfig                     |  1 +
 3 files changed, 19 insertions(+)

-- 
2.17.1


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[PATCH v4 1/5] dt-bindings: watchdog: add Allwinner H6 watchdog

[Clément Péron]

Allwinner H6 has a similar watchdog as the A64 which is already
a compatible of the A31.

This commit add the H6 compatible.

Signed-off-by: Clément Péron <peron.clem@gmail.com>
---
 Documentation/devicetree/bindings/watchdog/sunxi-wdt.txt | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Documentation/devicetree/bindings/watchdog/sunxi-wdt.txt b/Documentation/devicetree/bindings/watchdog/sunxi-wdt.txt
index 46055254e8dd..e65198d82a2b 100644
--- a/Documentation/devicetree/bindings/watchdog/sunxi-wdt.txt
+++ b/Documentation/devicetree/bindings/watchdog/sunxi-wdt.txt
@@ -6,6 +6,7 @@ Required properties:
 	"allwinner,sun4i-a10-wdt"
 	"allwinner,sun6i-a31-wdt"
 	"allwinner,sun50i-a64-wdt","allwinner,sun6i-a31-wdt"
+	"allwinner,sun50i-h6-wdt","allwinner,sun6i-a31-wdt"
 	"allwinner,suniv-f1c100s-wdt", "allwinner,sun4i-a10-wdt"
 - reg : Specifies base physical address and size of the registers.
 
-- 
2.17.1


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[PATCH v4 2/5] arm64: dts: allwinner: h6: add watchdog node

[Clément Péron]

Allwinner H6 has a watchog node which seems broken
on some boards.

Test has been performed on several boards.

Chen-Yu Tsai boards:
Pine H64 - H6448BA 7782 => OK
OrangePi Lite 2 - H8068BA 61C2 => KO

Martin Ayotte boards:
Pine H64 - H8069BA 6892 => OK
OrangePi 3 - HA047BA 69W2 => KO
OrangePi One Plus - H7310BA 6842 => KO
OrangePi Lite2 - H6448BA 6662 => KO

Clément Péron board:
Beelink GS1 - H7309BA 6842 => KO

As it seems not fixable for now, declare the node
but leave it disable with a comment.

Signed-off-by: Clément Péron <peron.clem@gmail.com>
---
 arch/arm64/boot/dts/allwinner/sun50i-h6.dtsi | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/arch/arm64/boot/dts/allwinner/sun50i-h6.dtsi b/arch/arm64/boot/dts/allwinner/sun50i-h6.dtsi
index 16c5c3d0fd81..13e70aebddbe 100644
--- a/arch/arm64/boot/dts/allwinner/sun50i-h6.dtsi
+++ b/arch/arm64/boot/dts/allwinner/sun50i-h6.dtsi
@@ -208,6 +208,15 @@
 			reg = <0x03006000 0x400>;
 		};
 
+		watchdog: watchdog@30090a0 {
+			compatible = "allwinner,sun50i-h6-wdt",
+				     "allwinner,sun6i-a31-wdt";
+			reg = <0x030090a0 0x20>;
+			interrupts = <GIC_SPI 50 IRQ_TYPE_LEVEL_HIGH>;
+			/* Broken on some H6 boards */
+			status = "disabled";
+		};
+
 		pio: pinctrl@300b000 {
 			compatible = "allwinner,sun50i-h6-pinctrl";
 			reg = <0x0300b000 0x400>;
-- 
2.17.1


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[PATCH v4 3/5] dt-bindings: watchdog: add Allwinner H6 r_watchdog

[Clément Péron]

Allwinner H6 has a second watchdog on the r-blocks which is
compatible with the A31.

This commit add the H6 compatible for the r_watchdog.

Signed-off-by: Clément Péron <peron.clem@gmail.com>
---
 Documentation/devicetree/bindings/watchdog/sunxi-wdt.txt | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Documentation/devicetree/bindings/watchdog/sunxi-wdt.txt b/Documentation/devicetree/bindings/watchdog/sunxi-wdt.txt
index e65198d82a2b..c5bef3dd43d0 100644
--- a/Documentation/devicetree/bindings/watchdog/sunxi-wdt.txt
+++ b/Documentation/devicetree/bindings/watchdog/sunxi-wdt.txt
@@ -6,6 +6,7 @@ Required properties:
 	"allwinner,sun4i-a10-wdt"
 	"allwinner,sun6i-a31-wdt"
 	"allwinner,sun50i-a64-wdt","allwinner,sun6i-a31-wdt"
+	"allwinner,sun50i-h6-r-wdt","allwinner,sun6i-a31-wdt"
 	"allwinner,sun50i-h6-wdt","allwinner,sun6i-a31-wdt"
 	"allwinner,suniv-f1c100s-wdt", "allwinner,sun4i-a10-wdt"
 - reg : Specifies base physical address and size of the registers.
-- 
2.17.1


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[PATCH v4 4/5] arm64: dts: allwinner: h6: add r_watchog node

[Clément Péron]

Allwinner H6 has a r_watchdog similar to A64.

Declare it in the device-tree.

Signed-off-by: Clément Péron <peron.clem@gmail.com>
---
 arch/arm64/boot/dts/allwinner/sun50i-h6.dtsi | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/arm64/boot/dts/allwinner/sun50i-h6.dtsi b/arch/arm64/boot/dts/allwinner/sun50i-h6.dtsi
index 13e70aebddbe..66897880c722 100644
--- a/arch/arm64/boot/dts/allwinner/sun50i-h6.dtsi
+++ b/arch/arm64/boot/dts/allwinner/sun50i-h6.dtsi
@@ -631,6 +631,13 @@
 			#reset-cells = <1>;
 		};
 
+		r_watchdog: watchdog@7020400 {
+			compatible = "allwinner,sun50i-h6-r-wdt",
+				     "allwinner,sun6i-a31-wdt";
+			reg = <0x07020400 0x20>;
+			interrupts = <GIC_SPI 103 IRQ_TYPE_LEVEL_HIGH>;
+		};
+
 		r_intc: interrupt-controller@7021000 {
 			compatible = "allwinner,sun50i-h6-r-intc",
 				     "allwinner,sun6i-a31-r-intc";
-- 
2.17.1


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[PATCH v4 5/5] arm64: defconfig: enable sunxi watchdog

[Clément Péron]

The SUNXI_WATCHDOG option is required to make the
watchdog available on Allwinner H6.

Enable this option as a module.

Signed-off-by: Clément Péron <peron.clem@gmail.com>
---
 arch/arm64/configs/defconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/configs/defconfig b/arch/arm64/configs/defconfig
index 4d583514258c..fc51dd4decb1 100644
--- a/arch/arm64/configs/defconfig
+++ b/arch/arm64/configs/defconfig
@@ -420,6 +420,7 @@ CONFIG_UNIPHIER_THERMAL=y
 CONFIG_WATCHDOG=y
 CONFIG_ARM_SP805_WATCHDOG=y
 CONFIG_S3C2410_WATCHDOG=y
+CONFIG_SUNXI_WATCHDOG=m
 CONFIG_IMX2_WDT=y
 CONFIG_MESON_GXBB_WATCHDOG=m
 CONFIG_MESON_WATCHDOG=m
-- 
2.17.1


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Re: [PATCH v4 3/5] dt-bindings: watchdog: add Allwinner H6 r_watchdog

[Maxime Ripard]

On Tue, May 21, 2019 at 06:03:28PM +0200, Clément Péron wrote:
> Allwinner H6 has a second watchdog on the r-blocks which is
> compatible with the A31.
>
> This commit add the H6 compatible for the r_watchdog.
>
> Signed-off-by: Clément Péron <peron.clem@gmail.com>

Unless you have some evidence that the two blocks are different, then
you should just reuse the same one.

Maxime

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Re: [PATCH v4 3/5] dt-bindings: watchdog: add Allwinner H6 r_watchdog

[Clément Péron]

Hi Maxime,

On Wed, 22 May 2019 at 12:32, Maxime Ripard <maxime.ripard@bootlin.com> wrote:
>
> On Tue, May 21, 2019 at 06:03:28PM +0200, Clément Péron wrote:
> > Allwinner H6 has a second watchdog on the r-blocks which is
> > compatible with the A31.
> >
> > This commit add the H6 compatible for the r_watchdog.
> >
> > Signed-off-by: Clément Péron <peron.clem@gmail.com>
>
> Unless you have some evidence that the two blocks are different, then
> you should just reuse the same one.

I have no evidence it's different nor identical, it's not documented
in the user manual.
I thought it would better to have separate bindings in case there is a
difference.
Than don't have and find later that we have to introduce one.

But as you prefer.

Regards,
Clément



>
> Maxime
>
> --
> Maxime Ripard, Bootlin
> Embedded Linux and Kernel engineering
> https://bootlin.com

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Re: [PATCH v4 3/5] dt-bindings: watchdog: add Allwinner H6 r_watchdog

[Maxime Ripard]

[-- Attachment #1.1: Type: text/plain, Size: 1268 bytes --]

On Wed, May 22, 2019 at 06:15:26PM +0200, Clément Péron wrote:
> Hi Maxime,
>
> On Wed, 22 May 2019 at 12:32, Maxime Ripard <maxime.ripard@bootlin.com> wrote:
> >
> > On Tue, May 21, 2019 at 06:03:28PM +0200, Clément Péron wrote:
> > > Allwinner H6 has a second watchdog on the r-blocks which is
> > > compatible with the A31.
> > >
> > > This commit add the H6 compatible for the r_watchdog.
> > >
> > > Signed-off-by: Clément Péron <peron.clem@gmail.com>
> >
> > Unless you have some evidence that the two blocks are different, then
> > you should just reuse the same one.
>
> I have no evidence it's different nor identical, it's not documented
> in the user manual.
> I thought it would better to have separate bindings in case there is a
> difference.
> Than don't have and find later that we have to introduce one.

It's a tradeoff. Pushing your logic to the limit, we would have a
compatible for each controller embedded in an SoC.

This would be unmaintainable, and slightly useless since that case is
very unlikely.

However, having differences between SoCs is quite common, hence why we
have different compatibles for each SoC.

Maxime

--
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Embedded Linux and Kernel engineering
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Re: [PATCH v4 3/5] dt-bindings: watchdog: add Allwinner H6 r_watchdog

[Clément Péron]

On Thu, 23 May 2019 at 14:57, Maxime Ripard <maxime.ripard@bootlin.com> wrote:
>
> On Wed, May 22, 2019 at 06:15:26PM +0200, Clément Péron wrote:
> > Hi Maxime,
> >
> > On Wed, 22 May 2019 at 12:32, Maxime Ripard <maxime.ripard@bootlin.com> wrote:
> > >
> > > On Tue, May 21, 2019 at 06:03:28PM +0200, Clément Péron wrote:
> > > > Allwinner H6 has a second watchdog on the r-blocks which is
> > > > compatible with the A31.
> > > >
> > > > This commit add the H6 compatible for the r_watchdog.
> > > >
> > > > Signed-off-by: Clément Péron <peron.clem@gmail.com>
> > >
> > > Unless you have some evidence that the two blocks are different, then
> > > you should just reuse the same one.
> >
> > I have no evidence it's different nor identical, it's not documented
> > in the user manual.
> > I thought it would better to have separate bindings in case there is a
> > difference.
> > Than don't have and find later that we have to introduce one.
>
> It's a tradeoff. Pushing your logic to the limit, we would have a
> compatible for each controller embedded in an SoC.
>
> This would be unmaintainable, and slightly useless since that case is
> very unlikely.
>
> However, having differences between SoCs is quite common, hence why we
> have different compatibles for each SoC.
Yes, that make sense, I will send a new version soon,

Thanks for the review,
Clément

>
> Maxime
>
> --
> Maxime Ripard, Bootlin
> Embedded Linux and Kernel engineering
> https://bootlin.com

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