[PATCH 0/5] arm64: renesas: Add R-Car S4-8 watchdog support on Spider

[PATCH 0/5] arm64: renesas: Add R-Car S4-8 watchdog support on Spider

[Geert Uytterhoeven]

	Hi all,

This patch series adds support for the RCLK Watchdog Timer (RWDT) in the
R-Car S4-8 SoC, and enables it on the Renesas Spider development board.

Patch 1 is to be queued in renesas-clk for v5.18.
Patches 2 and 3 are intended for the watchdog tree.
Patches 4 and 5 are to be queued in renesas-devel for v5.18.

Thanks for your comments!

Geert Uytterhoeven (3):
  clk: renesas: r8a779f0: Add WDT clock
  arm64: dts: renesas: r8a779f0: Add RWDT node
  arm64: dts: renesas: spider-cpu: Enable watchdog timer

Thanh Quan (2):
  dt-bindings: watchdog: renesas-wdt: Document r8a779f0 support
  watchdog: renesas_wdt: Add R-Car Gen4 support

 .../devicetree/bindings/watchdog/renesas,wdt.yaml      |  5 +++++
 arch/arm64/boot/dts/renesas/r8a779f0-spider-cpu.dtsi   |  5 +++++
 arch/arm64/boot/dts/renesas/r8a779f0.dtsi              | 10 ++++++++++
 drivers/clk/renesas/r8a779f0-cpg-mssr.c                |  9 +++++++++
 drivers/watchdog/renesas_wdt.c                         |  1 +
 5 files changed, 30 insertions(+)

-- 
2.25.1

Gr{oetje,eeting}s,

						Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
							    -- Linus Torvalds

[PATCH 1/5] clk: renesas: r8a779f0: Add WDT clock

[Geert Uytterhoeven]

Add the module clock used by the RCLK Watchdog Timer (RWDT) on the
Renesas R-Car S4-8 (r8a779f0) SoC.  Mark it as a critical clock, to
ensure uninterrupted watchdog operation.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
---
 drivers/clk/renesas/r8a779f0-cpg-mssr.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/clk/renesas/r8a779f0-cpg-mssr.c b/drivers/clk/renesas/r8a779f0-cpg-mssr.c
index 4100078406d67073..e48c5af7341454a7 100644
--- a/drivers/clk/renesas/r8a779f0-cpg-mssr.c
+++ b/drivers/clk/renesas/r8a779f0-cpg-mssr.c
@@ -121,6 +121,11 @@ static const struct mssr_mod_clk r8a779f0_mod_clks[] __initconst = {
 	DEF_MOD("scif4",	705,	R8A779F0_CLK_S0D12_PER),
 	DEF_MOD("sys-dmac0",	709,	R8A779F0_CLK_S0D3_PER),
 	DEF_MOD("sys-dmac1",	710,	R8A779F0_CLK_S0D3_PER),
+	DEF_MOD("wdt",		907,	R8A779F0_CLK_R),
+};
+
+static const unsigned int r8a779f0_crit_mod_clks[] __initconst = {
+	MOD_CLK_ID(907),	/* WDT */
 };
 
 /*
@@ -177,6 +182,10 @@ const struct cpg_mssr_info r8a779f0_cpg_mssr_info __initconst = {
 	.num_mod_clks = ARRAY_SIZE(r8a779f0_mod_clks),
 	.num_hw_mod_clks = 28 * 32,
 
+	/* Critical Module Clocks */
+	.crit_mod_clks = r8a779f0_crit_mod_clks,
+	.num_crit_mod_clks = ARRAY_SIZE(r8a779f0_crit_mod_clks),
+
 	/* Callbacks */
 	.init = r8a779f0_cpg_mssr_init,
 	.cpg_clk_register = rcar_gen4_cpg_clk_register,
-- 
2.25.1

Re: [PATCH 1/5] clk: renesas: r8a779f0: Add WDT clock

[Wolfram Sang]

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On Tue, Jan 18, 2022 at 06:09:01PM +0100, Geert Uytterhoeven wrote:
> Add the module clock used by the RCLK Watchdog Timer (RWDT) on the
> Renesas R-Car S4-8 (r8a779f0) SoC.  Mark it as a critical clock, to
> ensure uninterrupted watchdog operation.
> 
> Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>


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Re: [PATCH 1/5] clk: renesas: r8a779f0: Add WDT clock

[Guenter Roeck]

On Tue, Jan 18, 2022 at 06:09:01PM +0100, Geert Uytterhoeven wrote:
> Add the module clock used by the RCLK Watchdog Timer (RWDT) on the
> Renesas R-Car S4-8 (r8a779f0) SoC.  Mark it as a critical clock, to
> ensure uninterrupted watchdog operation.
> 
> Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
> Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>

Acked-by: Guenter Roeck <linux@roeck-us.net>

> ---
>  drivers/clk/renesas/r8a779f0-cpg-mssr.c | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/drivers/clk/renesas/r8a779f0-cpg-mssr.c b/drivers/clk/renesas/r8a779f0-cpg-mssr.c
> index 4100078406d67073..e48c5af7341454a7 100644
> --- a/drivers/clk/renesas/r8a779f0-cpg-mssr.c
> +++ b/drivers/clk/renesas/r8a779f0-cpg-mssr.c
> @@ -121,6 +121,11 @@ static const struct mssr_mod_clk r8a779f0_mod_clks[] __initconst = {
>  	DEF_MOD("scif4",	705,	R8A779F0_CLK_S0D12_PER),
>  	DEF_MOD("sys-dmac0",	709,	R8A779F0_CLK_S0D3_PER),
>  	DEF_MOD("sys-dmac1",	710,	R8A779F0_CLK_S0D3_PER),
> +	DEF_MOD("wdt",		907,	R8A779F0_CLK_R),
> +};
> +
> +static const unsigned int r8a779f0_crit_mod_clks[] __initconst = {
> +	MOD_CLK_ID(907),	/* WDT */
>  };
>  
>  /*
> @@ -177,6 +182,10 @@ const struct cpg_mssr_info r8a779f0_cpg_mssr_info __initconst = {
>  	.num_mod_clks = ARRAY_SIZE(r8a779f0_mod_clks),
>  	.num_hw_mod_clks = 28 * 32,
>  
> +	/* Critical Module Clocks */
> +	.crit_mod_clks = r8a779f0_crit_mod_clks,
> +	.num_crit_mod_clks = ARRAY_SIZE(r8a779f0_crit_mod_clks),
> +
>  	/* Callbacks */
>  	.init = r8a779f0_cpg_mssr_init,
>  	.cpg_clk_register = rcar_gen4_cpg_clk_register,

[PATCH 2/5] dt-bindings: watchdog: renesas-wdt: Document r8a779f0 support

[Geert Uytterhoeven]

From: Thanh Quan <thanh.quan.xn@renesas.com>

Document support for the Watchdog Timer (WDT) Controller in the Renesas
R-Car S4-8 (R8A779F0) SoC.

Signed-off-by: Thanh Quan <thanh.quan.xn@renesas.com>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
---
 Documentation/devicetree/bindings/watchdog/renesas,wdt.yaml | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Documentation/devicetree/bindings/watchdog/renesas,wdt.yaml b/Documentation/devicetree/bindings/watchdog/renesas,wdt.yaml
index 91a98ccd4226f505..d060438e1402d502 100644
--- a/Documentation/devicetree/bindings/watchdog/renesas,wdt.yaml
+++ b/Documentation/devicetree/bindings/watchdog/renesas,wdt.yaml
@@ -55,6 +55,11 @@ properties:
               - renesas,r8a779a0-wdt     # R-Car V3U
           - const: renesas,rcar-gen3-wdt # R-Car Gen3 and RZ/G2
 
+      - items:
+          - enum:
+              - renesas,r8a779f0-wdt     # R-Car S4-8
+          - const: renesas,rcar-gen4-wdt # R-Car Gen4
+
   reg:
     maxItems: 1
 
-- 
2.25.1

Re: [PATCH 2/5] dt-bindings: watchdog: renesas-wdt: Document r8a779f0 support

[Wolfram Sang]

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On Tue, Jan 18, 2022 at 06:09:02PM +0100, Geert Uytterhoeven wrote:
> From: Thanh Quan <thanh.quan.xn@renesas.com>
> 
> Document support for the Watchdog Timer (WDT) Controller in the Renesas
> R-Car S4-8 (R8A779F0) SoC.
> 
> Signed-off-by: Thanh Quan <thanh.quan.xn@renesas.com>
> Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>


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Re: [PATCH 2/5] dt-bindings: watchdog: renesas-wdt: Document r8a779f0 support

[Rob Herring]

On Tue, 18 Jan 2022 18:09:02 +0100, Geert Uytterhoeven wrote:
> From: Thanh Quan <thanh.quan.xn@renesas.com>
> 
> Document support for the Watchdog Timer (WDT) Controller in the Renesas
> R-Car S4-8 (R8A779F0) SoC.
> 
> Signed-off-by: Thanh Quan <thanh.quan.xn@renesas.com>
> Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
> ---
>  Documentation/devicetree/bindings/watchdog/renesas,wdt.yaml | 5 +++++
>  1 file changed, 5 insertions(+)
> 

Acked-by: Rob Herring <robh@kernel.org>

Re: [PATCH 2/5] dt-bindings: watchdog: renesas-wdt: Document r8a779f0 support

[Guenter Roeck]

On Tue, Jan 18, 2022 at 06:09:02PM +0100, Geert Uytterhoeven wrote:
> From: Thanh Quan <thanh.quan.xn@renesas.com>
> 
> Document support for the Watchdog Timer (WDT) Controller in the Renesas
> R-Car S4-8 (R8A779F0) SoC.
> 
> Signed-off-by: Thanh Quan <thanh.quan.xn@renesas.com>
> Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
> Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
> Acked-by: Rob Herring <robh@kernel.org>

Reviewed-by: Guenter Roeck <linux@roeck-us.net>

> ---
>  Documentation/devicetree/bindings/watchdog/renesas,wdt.yaml | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/watchdog/renesas,wdt.yaml b/Documentation/devicetree/bindings/watchdog/renesas,wdt.yaml
> index 91a98ccd4226f505..d060438e1402d502 100644
> --- a/Documentation/devicetree/bindings/watchdog/renesas,wdt.yaml
> +++ b/Documentation/devicetree/bindings/watchdog/renesas,wdt.yaml
> @@ -55,6 +55,11 @@ properties:
>                - renesas,r8a779a0-wdt     # R-Car V3U
>            - const: renesas,rcar-gen3-wdt # R-Car Gen3 and RZ/G2
>  
> +      - items:
> +          - enum:
> +              - renesas,r8a779f0-wdt     # R-Car S4-8
> +          - const: renesas,rcar-gen4-wdt # R-Car Gen4
> +
>    reg:
>      maxItems: 1
>  

[PATCH 3/5] watchdog: renesas_wdt: Add R-Car Gen4 support

[Geert Uytterhoeven]

From: Thanh Quan <thanh.quan.xn@renesas.com>

Add the compatible string for the R-Car Gen4 family.
No further driver changes are needed.

Signed-off-by: Thanh Quan <thanh.quan.xn@renesas.com>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
---
 drivers/watchdog/renesas_wdt.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/watchdog/renesas_wdt.c b/drivers/watchdog/renesas_wdt.c
index 5791198960e6c5bf..41d58ea5eb2f40fd 100644
--- a/drivers/watchdog/renesas_wdt.c
+++ b/drivers/watchdog/renesas_wdt.c
@@ -327,6 +327,7 @@ static SIMPLE_DEV_PM_OPS(rwdt_pm_ops, rwdt_suspend, rwdt_resume);
 static const struct of_device_id rwdt_ids[] = {
 	{ .compatible = "renesas,rcar-gen2-wdt", },
 	{ .compatible = "renesas,rcar-gen3-wdt", },
+	{ .compatible = "renesas,rcar-gen4-wdt", },
 	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, rwdt_ids);
-- 
2.25.1

Re: [PATCH 3/5] watchdog: renesas_wdt: Add R-Car Gen4 support

[Wolfram Sang]

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On Tue, Jan 18, 2022 at 06:09:03PM +0100, Geert Uytterhoeven wrote:
> From: Thanh Quan <thanh.quan.xn@renesas.com>
> 
> Add the compatible string for the R-Car Gen4 family.
> No further driver changes are needed.
> 
> Signed-off-by: Thanh Quan <thanh.quan.xn@renesas.com>
> Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>


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Re: [PATCH 3/5] watchdog: renesas_wdt: Add R-Car Gen4 support

[Guenter Roeck]

On Tue, Jan 18, 2022 at 06:09:03PM +0100, Geert Uytterhoeven wrote:
> From: Thanh Quan <thanh.quan.xn@renesas.com>
> 
> Add the compatible string for the R-Car Gen4 family.
> No further driver changes are needed.
> 
> Signed-off-by: Thanh Quan <thanh.quan.xn@renesas.com>
> Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
> Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>

Reviewed-by: Guenter Roeck <linux@roeck-us.net>

> ---
>  drivers/watchdog/renesas_wdt.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/watchdog/renesas_wdt.c b/drivers/watchdog/renesas_wdt.c
> index 5791198960e6c5bf..41d58ea5eb2f40fd 100644
> --- a/drivers/watchdog/renesas_wdt.c
> +++ b/drivers/watchdog/renesas_wdt.c
> @@ -327,6 +327,7 @@ static SIMPLE_DEV_PM_OPS(rwdt_pm_ops, rwdt_suspend, rwdt_resume);
>  static const struct of_device_id rwdt_ids[] = {
>  	{ .compatible = "renesas,rcar-gen2-wdt", },
>  	{ .compatible = "renesas,rcar-gen3-wdt", },
> +	{ .compatible = "renesas,rcar-gen4-wdt", },
>  	{ /* sentinel */ }
>  };
>  MODULE_DEVICE_TABLE(of, rwdt_ids);

[PATCH 4/5] arm64: dts: renesas: r8a779f0: Add RWDT node

[Geert Uytterhoeven]

Add a device node for the RCLK Watchdog Timer (RWDT) on the Renesas
R-Car S4-8 (R8A779F0) SoC.

Extracted from a larger patch in the BSP by LUU HOAI.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
---
 arch/arm64/boot/dts/renesas/r8a779f0.dtsi | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/arch/arm64/boot/dts/renesas/r8a779f0.dtsi b/arch/arm64/boot/dts/renesas/r8a779f0.dtsi
index 5426532d10e2a472..0ac8c345558efc17 100644
--- a/arch/arm64/boot/dts/renesas/r8a779f0.dtsi
+++ b/arch/arm64/boot/dts/renesas/r8a779f0.dtsi
@@ -59,6 +59,16 @@ soc: soc {
 		#size-cells = <2>;
 		ranges;
 
+		rwdt: watchdog@e6020000 {
+			compatible = "renesas,r8a779f0-wdt",
+				     "renesas,rcar-gen4-wdt";
+			reg = <0 0xe6020000 0 0x0c>;
+			clocks = <&cpg CPG_MOD 907>;
+			power-domains = <&sysc R8A779F0_PD_ALWAYS_ON>;
+			resets = <&cpg 907>;
+			status = "disabled";
+		};
+
 		cpg: clock-controller@e6150000 {
 			compatible = "renesas,r8a779f0-cpg-mssr";
 			reg = <0 0xe6150000 0 0x4000>;
-- 
2.25.1

Re: [PATCH 4/5] arm64: dts: renesas: r8a779f0: Add RWDT node

[Wolfram Sang]

[-- Attachment #1: Type: text/plain, Size: 364 bytes --]

On Tue, Jan 18, 2022 at 06:09:04PM +0100, Geert Uytterhoeven wrote:
> Add a device node for the RCLK Watchdog Timer (RWDT) on the Renesas
> R-Car S4-8 (R8A779F0) SoC.
> 
> Extracted from a larger patch in the BSP by LUU HOAI.
> 
> Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>


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Re: [PATCH 4/5] arm64: dts: renesas: r8a779f0: Add RWDT node

[Guenter Roeck]

On Tue, Jan 18, 2022 at 06:09:04PM +0100, Geert Uytterhoeven wrote:
> Add a device node for the RCLK Watchdog Timer (RWDT) on the Renesas
> R-Car S4-8 (R8A779F0) SoC.
> 
> Extracted from a larger patch in the BSP by LUU HOAI.
> 
> Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
> Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>

Acked-by: Guenter Roeck <linux@roeck-us.net>

> ---
>  arch/arm64/boot/dts/renesas/r8a779f0.dtsi | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/renesas/r8a779f0.dtsi b/arch/arm64/boot/dts/renesas/r8a779f0.dtsi
> index 5426532d10e2a472..0ac8c345558efc17 100644
> --- a/arch/arm64/boot/dts/renesas/r8a779f0.dtsi
> +++ b/arch/arm64/boot/dts/renesas/r8a779f0.dtsi
> @@ -59,6 +59,16 @@ soc: soc {
>  		#size-cells = <2>;
>  		ranges;
>  
> +		rwdt: watchdog@e6020000 {
> +			compatible = "renesas,r8a779f0-wdt",
> +				     "renesas,rcar-gen4-wdt";
> +			reg = <0 0xe6020000 0 0x0c>;
> +			clocks = <&cpg CPG_MOD 907>;
> +			power-domains = <&sysc R8A779F0_PD_ALWAYS_ON>;
> +			resets = <&cpg 907>;
> +			status = "disabled";
> +		};
> +
>  		cpg: clock-controller@e6150000 {
>  			compatible = "renesas,r8a779f0-cpg-mssr";
>  			reg = <0 0xe6150000 0 0x4000>;

[PATCH 5/5] arm64: dts: renesas: spider-cpu: Enable watchdog timer

[Geert Uytterhoeven]

Enable the watchdog timer on the Spider board.

Extracted from a larger patch in the BSP by LUU HOAI.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
---
For the watchdog to be able to actually reboot the system, this depends
on proper configuration of the Watchdog Timer Reset Control Register
(WDTRSTCR) in the Reset (RST) module, either by Linux[1], or by the
firmware.

[1] "[PATCH LOCAL v2] soc: renesas: rcar-rst: Allow WDT reset on R-Car
     Gen4"
    https://lore.kernel.org/r/39005cf749a99afc6d3ba96ff155fd2a231418a8.1642524743.git.geert+renesas@glider.be
---
 arch/arm64/boot/dts/renesas/r8a779f0-spider-cpu.dtsi | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/arm64/boot/dts/renesas/r8a779f0-spider-cpu.dtsi b/arch/arm64/boot/dts/renesas/r8a779f0-spider-cpu.dtsi
index 156586532c844c41..3a90932fe85c8243 100644
--- a/arch/arm64/boot/dts/renesas/r8a779f0-spider-cpu.dtsi
+++ b/arch/arm64/boot/dts/renesas/r8a779f0-spider-cpu.dtsi
@@ -31,6 +31,11 @@ &extalr_clk {
 	clock-frequency = <32768>;
 };
 
+&rwdt {
+	timeout-sec = <60>;
+	status = "okay";
+};
+
 &scif3 {
 	status = "okay";
 };
-- 
2.25.1

Re: [PATCH 5/5] arm64: dts: renesas: spider-cpu: Enable watchdog timer

[Wolfram Sang]

[-- Attachment #1: Type: text/plain, Size: 313 bytes --]

On Tue, Jan 18, 2022 at 06:09:05PM +0100, Geert Uytterhoeven wrote:
> Enable the watchdog timer on the Spider board.
> 
> Extracted from a larger patch in the BSP by LUU HOAI.
> 
> Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>


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Re: [PATCH 5/5] arm64: dts: renesas: spider-cpu: Enable watchdog timer

[Guenter Roeck]

On Tue, Jan 18, 2022 at 06:09:05PM +0100, Geert Uytterhoeven wrote:
> Enable the watchdog timer on the Spider board.
> 
> Extracted from a larger patch in the BSP by LUU HOAI.
> 
> Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
> Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>

Acked-by: Guenter Roeck <linux@roeck-us.net>

> ---
> For the watchdog to be able to actually reboot the system, this depends
> on proper configuration of the Watchdog Timer Reset Control Register
> (WDTRSTCR) in the Reset (RST) module, either by Linux[1], or by the
> firmware.
> 
> [1] "[PATCH LOCAL v2] soc: renesas: rcar-rst: Allow WDT reset on R-Car
>      Gen4"
>     https://lore.kernel.org/r/39005cf749a99afc6d3ba96ff155fd2a231418a8.1642524743.git.geert+renesas@glider.be
> ---
>  arch/arm64/boot/dts/renesas/r8a779f0-spider-cpu.dtsi | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/renesas/r8a779f0-spider-cpu.dtsi b/arch/arm64/boot/dts/renesas/r8a779f0-spider-cpu.dtsi
> index 156586532c844c41..3a90932fe85c8243 100644
> --- a/arch/arm64/boot/dts/renesas/r8a779f0-spider-cpu.dtsi
> +++ b/arch/arm64/boot/dts/renesas/r8a779f0-spider-cpu.dtsi
> @@ -31,6 +31,11 @@ &extalr_clk {
>  	clock-frequency = <32768>;
>  };
>  
> +&rwdt {
> +	timeout-sec = <60>;
> +	status = "okay";
> +};
> +
>  &scif3 {
>  	status = "okay";
>  };