[RFC v4 00/26] Fix watchdog on Renesas R-Car Gen2 and RZ/G1

[RFC v4 00/26] Fix watchdog on Renesas R-Car Gen2 and RZ/G1

[Fabrizio Castro]

Dear All,

the forth version of this series aims at consolidating the watchdog fix.
There is a discussion still in progress about the changes to the
watchdog driver, please see the following for more information:
https://patchwork.kernel.org/patch/10192435/

It doesn't look like leaving the restart handler in for Gen3 is going
to do any harm (but it may be unwelcome), perhaps esplicitly setting
its priority to a medium level (128) will help its adoption on Gen3
as well? This is what this particular version is proposing.

Also, although the latest implmentation of the reset vector hasn't
raised any problem so far, it hasn't received any feedback either.
Please do look into it to espose problems and weaknesses (if any).

Finally, it would be great if someone could test this patch set on his
Gen2/Gen3/RZ/G1 board, and it would be awesome if that board was a
Lager with all of the cores enabled and working at the same time ;-)

Best Regards,

Fabrizio Castro (26):
  ARM: shmobile: Add watchdog support
  ARM: dts: r8a7743: Adjust SMP routine size
  ARM: dts: r8a7745: Adjust SMP routine size
  ARM: dts: r8a7790: Adjust SMP routine size
  ARM: dts: r8a7791: Adjust SMP routine size
  ARM: dts: r8a7792: Adjust SMP routine size
  ARM: dts: r8a7793: Adjust SMP routine size
  ARM: dts: r8a7794: Adjust SMP routine size
  soc: renesas: rcar-rst: Enable watchdog as reset trigger for Gen2
  ARM: shmobile: rcar-gen2: Add watchdog support
  dt-bindings: watchdog: renesas-wdt: Add R-Car Gen2 support
  watchdog: renesas_wdt: Add R-Car Gen2 support
  watchdog: renesas_wdt: Add restart handler
  ARM: shmobile: defconfig: Enable RENESAS_WDT_GEN
  clk: renesas: r8a7743: Add rwdt clock
  clk: renesas: r8a7745: Add rwdt clock
  clk: renesas: r8a7790: Add rwdt clock
  clk: renesas: r8a7791/r8a7793: Add rwdt clock
  clk: renesas: r8a7794: Add rwdt clock
  ARM: dts: r8a7743: Add watchdog support to SoC dtsi
  ARM: dts: r8a7745: Add watchdog support to SoC dtsi
  ARM: dts: r8a7790: Add watchdog support to SoC dtsi
  ARM: dts: r8a7791: Add watchdog support to SoC dtsi
  ARM: dts: r8a7794: Add watchdog support to SoC dtsi
  ARM: dts: iwg20m: Add watchdog support to SoM dtsi
  ARM: dts: iwg22m: Add watchdog support to SoM dtsi

 .../devicetree/bindings/watchdog/renesas-wdt.txt   | 19 +++++--
 arch/arm/boot/dts/r8a7743-iwg20m.dtsi              |  5 ++
 arch/arm/boot/dts/r8a7743.dtsi                     | 12 ++++-
 arch/arm/boot/dts/r8a7745-iwg22m.dtsi              |  5 ++
 arch/arm/boot/dts/r8a7745.dtsi                     | 12 ++++-
 arch/arm/boot/dts/r8a7790.dtsi                     | 12 ++++-
 arch/arm/boot/dts/r8a7791.dtsi                     | 12 ++++-
 arch/arm/boot/dts/r8a7792.dtsi                     |  2 +-
 arch/arm/boot/dts/r8a7793.dtsi                     |  2 +-
 arch/arm/boot/dts/r8a7794.dtsi                     | 12 ++++-
 arch/arm/configs/shmobile_defconfig                |  1 +
 arch/arm/mach-shmobile/common.h                    |  6 +++
 arch/arm/mach-shmobile/headsmp.S                   | 55 +++++++++++++++++++
 arch/arm/mach-shmobile/platsmp-apmu.c              |  1 +
 arch/arm/mach-shmobile/pm-rcar-gen2.c              | 13 +++--
 drivers/clk/renesas/r8a7743-cpg-mssr.c             |  2 +
 drivers/clk/renesas/r8a7745-cpg-mssr.c             |  2 +
 drivers/clk/renesas/r8a7790-cpg-mssr.c             |  2 +
 drivers/clk/renesas/r8a7791-cpg-mssr.c             |  2 +
 drivers/clk/renesas/r8a7794-cpg-mssr.c             |  2 +
 drivers/soc/renesas/rcar-rst.c                     | 35 +++++++++---
 drivers/watchdog/renesas_wdt.c                     | 62 ++++++++++++++++++++--
 22 files changed, 250 insertions(+), 26 deletions(-)

-- 
2.7.4

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[RFC v4 01/26] ARM: shmobile: Add watchdog support

[Fabrizio Castro]

On R-Car Gen2 and RZ/G1 platforms, we use the SBAR registers to make non
boot CPUs run a routine designed to bring up SMP and deal with hot plug.
The value contained in the SBAR registers is not initialized by a WDT
triggered reset, which means that after a WDT triggered reset we jump
to the SMP bring up routine, preventing the system from executing the
bootrom code.

The purpose of this patch is to jump to the bootrom code in case of a
WDT triggered reset, and keep the SMP functionality untouched.
In order to tell if the code had been called due to the WDT overflowing
we are testing WOVF from register RWTCSRA.

The new function shmobile_boot_vector_gen2 isn't replacing
shmobile_boot_vector for backward compatibility reasons. The kernel
will install the best option (either shmobile_boot_vector or
shmobile_boot_vector_gen2) to ICRAM1 after parsing the device tree,
according to the amount of memory available.

Since shmobile_boot_vector has become bigger, "reg" property of nodes
compatible with "renesas,smp-sram" now need to be set to a value
greater or equal to "<0 0x60>".

Signed-off-by: Fabrizio Castro <fabrizio.castro@bp.renesas.com>
Signed-off-by: Ramesh Shanmugasundaram <ramesh.shanmugasundaram@bp.renesas.com>
---
v3->4:
* no change

 arch/arm/mach-shmobile/common.h  |  6 +++++
 arch/arm/mach-shmobile/headsmp.S | 55 ++++++++++++++++++++++++++++++++++++++++
 2 files changed, 61 insertions(+)

diff --git a/arch/arm/mach-shmobile/common.h b/arch/arm/mach-shmobile/common.h
index a8fa4f7..d8c11f5 100644
--- a/arch/arm/mach-shmobile/common.h
+++ b/arch/arm/mach-shmobile/common.h
@@ -7,6 +7,12 @@ extern void shmobile_init_delay(void);
 extern void shmobile_boot_vector(void);
 extern unsigned long shmobile_boot_fn;
 extern unsigned long shmobile_boot_size;
+#ifdef CONFIG_ARCH_RCAR_GEN2
+extern void shmobile_boot_vector_gen2(void);
+extern unsigned long shmobile_boot_fn_gen2;
+extern unsigned long shmobile_boot_cpu_gen2;
+extern unsigned long shmobile_boot_size_gen2;
+#endif /* CONFIG_ARCH_RCAR_GEN2 */
 extern void shmobile_smp_boot(void);
 extern void shmobile_smp_sleep(void);
 extern void shmobile_smp_hook(unsigned int cpu, unsigned long fn,
diff --git a/arch/arm/mach-shmobile/headsmp.S b/arch/arm/mach-shmobile/headsmp.S
index 32e0bf6..cef8e8c 100644
--- a/arch/arm/mach-shmobile/headsmp.S
+++ b/arch/arm/mach-shmobile/headsmp.S
@@ -16,6 +16,11 @@
 #include <asm/assembler.h>
 #include <asm/memory.h>
 
+#define SCTLR_MMU	0x01
+#define BOOTROM_ADDRESS	0xE6340000
+#define RWTCSRA_ADDRESS 0xE6020004
+#define RWTCSRA_WOVF	0x10
+
 /*
  * Reset vector for secondary CPUs.
  * This will be mapped at address 0 by SBAR register.
@@ -37,6 +42,56 @@ shmobile_boot_fn:
 shmobile_boot_size:
 	.long	. - shmobile_boot_vector
 
+#ifdef CONFIG_ARCH_RCAR_GEN2
+/*
+ * Reset vector for R-Car Gen2 and RZ/G1 secondary CPUs.
+ * This will be mapped at address 0 by SBAR register.
+ */
+ENTRY(shmobile_boot_vector_gen2)
+	mrc	p15, 0, r0, c0, c0, 5		@ r0 = MPIDR
+	ldr	r1, shmobile_boot_cpu_gen2
+	cmp	r0, r1
+	bne	shmobile_smp_continue_gen2
+
+	mrc	p15, 0, r1, c1, c0, 0		@ r1 = SCTLR
+	and	r0, r1, #SCTLR_MMU
+	cmp	r0, #SCTLR_MMU
+	beq	shmobile_smp_continue_gen2
+
+	ldr	r0, rwtcsra
+	mov	r1, #0
+	ldrb	r1, [r0]
+	and	r0, r1, #RWTCSRA_WOVF
+	cmp	r0, #RWTCSRA_WOVF
+	bne	shmobile_smp_continue_gen2
+
+	ldr	r0, bootrom
+	bx	r0
+
+shmobile_smp_continue_gen2:
+	ldr     r1, shmobile_boot_fn_gen2
+	bx	r1
+
+ENDPROC(shmobile_boot_vector_gen2)
+
+	.align	4
+rwtcsra:
+	.word	RWTCSRA_ADDRESS
+bootrom:
+	.word	BOOTROM_ADDRESS
+	.globl	shmobile_boot_cpu_gen2
+shmobile_boot_cpu_gen2:
+	.word	0x00000000
+
+	.align	2
+	.globl	shmobile_boot_fn_gen2
+shmobile_boot_fn_gen2:
+	.space	4
+	.globl	shmobile_boot_size_gen2
+shmobile_boot_size_gen2:
+	.long	. - shmobile_boot_vector_gen2
+#endif /* CONFIG_ARCH_RCAR_GEN2 */
+
 /*
  * Per-CPU SMP boot function/argument selection code based on MPIDR
  */
-- 
2.7.4

[RFC v4 02/26] ARM: dts: r8a7743: Adjust SMP routine size

[Fabrizio Castro]

This patch adjusts the definition of the SMP routine size according
to the latest changes made by commit:
"ARM: shmobile: Add watchdog support"

Signed-off-by: Fabrizio Castro <fabrizio.castro-kTT6dE0pTRh9uiUsa/gSgQ@public.gmane.org>
Signed-off-by: Ramesh Shanmugasundaram <ramesh.shanmugasundaram-kTT6dE0pTRh9uiUsa/gSgQ@public.gmane.org>
Reviewed-by: Geert Uytterhoeven <geert+renesas-gXvu3+zWzMSzQB+pC5nmwQ@public.gmane.org>
---
v3->4:
* no change

 arch/arm/boot/dts/r8a7743.dtsi | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/boot/dts/r8a7743.dtsi b/arch/arm/boot/dts/r8a7743.dtsi
index 47b62f6..c2943d7 100644
--- a/arch/arm/boot/dts/r8a7743.dtsi
+++ b/arch/arm/boot/dts/r8a7743.dtsi
@@ -973,7 +973,7 @@
 
 			smp-sram@0 {
 				compatible = "renesas,smp-sram";
-				reg = <0 0x10>;
+				reg = <0 0x100>;
 			};
 		};
 
-- 
2.7.4

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[RFC v4 03/26] ARM: dts: r8a7745: Adjust SMP routine size

[Fabrizio Castro]

This patch adjusts the definition of the SMP routine size according
to the latest changes made by commit:
"ARM: shmobile: Add watchdog support"

Signed-off-by: Fabrizio Castro <fabrizio.castro-kTT6dE0pTRh9uiUsa/gSgQ@public.gmane.org>
Signed-off-by: Ramesh Shanmugasundaram <ramesh.shanmugasundaram-kTT6dE0pTRh9uiUsa/gSgQ@public.gmane.org>
Reviewed-by: Geert Uytterhoeven <geert+renesas-gXvu3+zWzMSzQB+pC5nmwQ@public.gmane.org>
---
v3->4:
* no change

 arch/arm/boot/dts/r8a7745.dtsi | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/boot/dts/r8a7745.dtsi b/arch/arm/boot/dts/r8a7745.dtsi
index ddc3da2..6bc1cf4 100644
--- a/arch/arm/boot/dts/r8a7745.dtsi
+++ b/arch/arm/boot/dts/r8a7745.dtsi
@@ -755,7 +755,7 @@
 
 			smp-sram@0 {
 				compatible = "renesas,smp-sram";
-				reg = <0 0x10>;
+				reg = <0 0x100>;
 			};
 		};
 
-- 
2.7.4

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[RFC v4 04/26] ARM: dts: r8a7790: Adjust SMP routine size

[Fabrizio Castro]

This patch adjusts the definition of the SMP routine size according
to the latest changes made by commit:
"ARM: shmobile: Add watchdog support"

Signed-off-by: Fabrizio Castro <fabrizio.castro@bp.renesas.com>
Signed-off-by: Ramesh Shanmugasundaram <ramesh.shanmugasundaram@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
---
v3->4:
* no change

 arch/arm/boot/dts/r8a7790.dtsi | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/boot/dts/r8a7790.dtsi b/arch/arm/boot/dts/r8a7790.dtsi
index 3bbcc0b..a84bf35 100644
--- a/arch/arm/boot/dts/r8a7790.dtsi
+++ b/arch/arm/boot/dts/r8a7790.dtsi
@@ -443,7 +443,7 @@
 
 			smp-sram@0 {
 				compatible = "renesas,smp-sram";
-				reg = <0 0x10>;
+				reg = <0 0x100>;
 			};
 		};
 
-- 
2.7.4

[RFC v4 05/26] ARM: dts: r8a7791: Adjust SMP routine size

[Fabrizio Castro]

This patch adjusts the definition of the SMP routine size according
to the latest changes made by commit:
"ARM: shmobile: Add watchdog support"

Signed-off-by: Fabrizio Castro <fabrizio.castro-kTT6dE0pTRh9uiUsa/gSgQ@public.gmane.org>
Signed-off-by: Ramesh Shanmugasundaram <ramesh.shanmugasundaram-kTT6dE0pTRh9uiUsa/gSgQ@public.gmane.org>
Reviewed-by: Geert Uytterhoeven <geert+renesas-gXvu3+zWzMSzQB+pC5nmwQ@public.gmane.org>
---
v3->4:
* no change

 arch/arm/boot/dts/r8a7791.dtsi | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/boot/dts/r8a7791.dtsi b/arch/arm/boot/dts/r8a7791.dtsi
index dc65935..d2a4546 100644
--- a/arch/arm/boot/dts/r8a7791.dtsi
+++ b/arch/arm/boot/dts/r8a7791.dtsi
@@ -407,7 +407,7 @@
 
 			smp-sram@0 {
 				compatible = "renesas,smp-sram";
-				reg = <0 0x10>;
+				reg = <0 0x100>;
 			};
 		};
 
-- 
2.7.4

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[RFC v4 06/26] ARM: dts: r8a7792: Adjust SMP routine size

[Fabrizio Castro]

This patch adjusts the definition of the SMP routine size according
to the latest changes made by commit:
"ARM: shmobile: Add watchdog support"

Signed-off-by: Fabrizio Castro <fabrizio.castro@bp.renesas.com>
Signed-off-by: Ramesh Shanmugasundaram <ramesh.shanmugasundaram@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
---
v3->4:
* no change

 arch/arm/boot/dts/r8a7792.dtsi | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/boot/dts/r8a7792.dtsi b/arch/arm/boot/dts/r8a7792.dtsi
index 268987f..bea0f12 100644
--- a/arch/arm/boot/dts/r8a7792.dtsi
+++ b/arch/arm/boot/dts/r8a7792.dtsi
@@ -341,7 +341,7 @@
 
 			smp-sram@0 {
 				compatible = "renesas,smp-sram";
-				reg = <0 0x10>;
+				reg = <0 0x100>;
 			};
 		};
 
-- 
2.7.4

[RFC v4 07/26] ARM: dts: r8a7793: Adjust SMP routine size

[Fabrizio Castro]

This patch adjusts the definition of the SMP routine size according
to the latest changes made by commit:
"ARM: shmobile: Add watchdog support"

Signed-off-by: Fabrizio Castro <fabrizio.castro-kTT6dE0pTRh9uiUsa/gSgQ@public.gmane.org>
Signed-off-by: Ramesh Shanmugasundaram <ramesh.shanmugasundaram-kTT6dE0pTRh9uiUsa/gSgQ@public.gmane.org>
Reviewed-by: Geert Uytterhoeven <geert+renesas-gXvu3+zWzMSzQB+pC5nmwQ@public.gmane.org>
---
v3->4:
* no change

 arch/arm/boot/dts/r8a7793.dtsi | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/boot/dts/r8a7793.dtsi b/arch/arm/boot/dts/r8a7793.dtsi
index aa7d779..bde6969 100644
--- a/arch/arm/boot/dts/r8a7793.dtsi
+++ b/arch/arm/boot/dts/r8a7793.dtsi
@@ -392,7 +392,7 @@
 
 			smp-sram@0 {
 				compatible = "renesas,smp-sram";
-				reg = <0 0x10>;
+				reg = <0 0x100>;
 			};
 		};
 
-- 
2.7.4

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[RFC v4 08/26] ARM: dts: r8a7794: Adjust SMP routine size

[Fabrizio Castro]

This patch adjusts the definition of the SMP routine size according
to the latest changes made by commit:
"ARM: shmobile: Add watchdog support"

Signed-off-by: Fabrizio Castro <fabrizio.castro@bp.renesas.com>
Signed-off-by: Ramesh Shanmugasundaram <ramesh.shanmugasundaram@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
---
v3->4:
* no change

 arch/arm/boot/dts/r8a7794.dtsi | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/boot/dts/r8a7794.dtsi b/arch/arm/boot/dts/r8a7794.dtsi
index d588efa..e47c5f4 100644
--- a/arch/arm/boot/dts/r8a7794.dtsi
+++ b/arch/arm/boot/dts/r8a7794.dtsi
@@ -348,7 +348,7 @@
 
 			smp-sram@0 {
 				compatible = "renesas,smp-sram";
-				reg = <0 0x10>;
+				reg = <0 0x100>;
 			};
 		};
 
-- 
2.7.4

[RFC v4 09/26] soc: renesas: rcar-rst: Enable watchdog as reset trigger for Gen2

[Fabrizio Castro]

This patch allows for platform specific quirks as some of the SoC need
further customization for the watchdog to work properly, like for R-Car
Gen2 and for RZ/G.

Signed-off-by: Fabrizio Castro <fabrizio.castro@bp.renesas.com>
Signed-off-by: Ramesh Shanmugasundaram <ramesh.shanmugasundaram@bp.renesas.com>
---
v3->4:
* no change

 drivers/soc/renesas/rcar-rst.c | 35 +++++++++++++++++++++++++++++------
 1 file changed, 29 insertions(+), 6 deletions(-)

diff --git a/drivers/soc/renesas/rcar-rst.c b/drivers/soc/renesas/rcar-rst.c
index 3316b02..93febe6 100644
--- a/drivers/soc/renesas/rcar-rst.c
+++ b/drivers/soc/renesas/rcar-rst.c
@@ -13,8 +13,18 @@
 #include <linux/of_address.h>
 #include <linux/soc/renesas/rcar-rst.h>
 
+#define WDTRSTCR_RESET		0xA55A0002
+#define WDTRSTCR		0x0054
+
+static int rcar_rst_enable_wdt_reset(void __iomem *base)
+{
+	iowrite32(WDTRSTCR_RESET, base + WDTRSTCR);
+	return 0;
+}
+
 struct rst_config {
-	unsigned int modemr;	/* Mode Monitoring Register Offset */
+	unsigned int modemr;		/* Mode Monitoring Register Offset */
+	int (*configure)(void *base);	/* Platform specific configuration */
 };
 
 static const struct rst_config rcar_rst_gen1 __initconst = {
@@ -23,6 +33,11 @@ static const struct rst_config rcar_rst_gen1 __initconst = {
 
 static const struct rst_config rcar_rst_gen2 __initconst = {
 	.modemr = 0x60,
+	.configure = rcar_rst_enable_wdt_reset,
+};
+
+static const struct rst_config rcar_rst_gen3 __initconst = {
+	.modemr = 0x60,
 };
 
 static const struct of_device_id rcar_rst_matches[] __initconst = {
@@ -38,11 +53,11 @@ static const struct of_device_id rcar_rst_matches[] __initconst = {
 	{ .compatible = "renesas,r8a7792-rst", .data = &rcar_rst_gen2 },
 	{ .compatible = "renesas,r8a7793-rst", .data = &rcar_rst_gen2 },
 	{ .compatible = "renesas,r8a7794-rst", .data = &rcar_rst_gen2 },
-	/* R-Car Gen3 is handled like R-Car Gen2 */
-	{ .compatible = "renesas,r8a7795-rst", .data = &rcar_rst_gen2 },
-	{ .compatible = "renesas,r8a7796-rst", .data = &rcar_rst_gen2 },
-	{ .compatible = "renesas,r8a77970-rst", .data = &rcar_rst_gen2 },
-	{ .compatible = "renesas,r8a77995-rst", .data = &rcar_rst_gen2 },
+	/* R-Car Gen3 */
+	{ .compatible = "renesas,r8a7795-rst", .data = &rcar_rst_gen3 },
+	{ .compatible = "renesas,r8a7796-rst", .data = &rcar_rst_gen3 },
+	{ .compatible = "renesas,r8a77970-rst", .data = &rcar_rst_gen3 },
+	{ .compatible = "renesas,r8a77995-rst", .data = &rcar_rst_gen3 },
 	{ /* sentinel */ }
 };
 
@@ -71,6 +86,14 @@ static int __init rcar_rst_init(void)
 	rcar_rst_base = base;
 	cfg = match->data;
 	saved_mode = ioread32(base + cfg->modemr);
+	if (cfg->configure) {
+		error = cfg->configure(base);
+		if (error) {
+			pr_warn("%pOF: Cannot run SoC specific configuration\n",
+				np);
+			goto out_put;
+		}
+	}
 
 	pr_debug("%pOF: MODE = 0x%08x\n", np, saved_mode);
 
-- 
2.7.4

[RFC v4 10/26] ARM: shmobile: rcar-gen2: Add watchdog support

[Fabrizio Castro]

This patch adds watchdog support by installing shmobile_boot_vector_gen2
to ICRAM1 when enough memory is available, in which case we also keep a
copy of MPIDR to complete the reset vector logic.

Signed-off-by: Fabrizio Castro <fabrizio.castro-kTT6dE0pTRh9uiUsa/gSgQ@public.gmane.org>
Signed-off-by: Ramesh Shanmugasundaram <ramesh.shanmugasundaram-kTT6dE0pTRh9uiUsa/gSgQ@public.gmane.org>
---
v3->4:
* no change

 arch/arm/mach-shmobile/platsmp-apmu.c |  1 +
 arch/arm/mach-shmobile/pm-rcar-gen2.c | 13 ++++++++++---
 2 files changed, 11 insertions(+), 3 deletions(-)

diff --git a/arch/arm/mach-shmobile/platsmp-apmu.c b/arch/arm/mach-shmobile/platsmp-apmu.c
index 4422b61..ba732ef 100644
--- a/arch/arm/mach-shmobile/platsmp-apmu.c
+++ b/arch/arm/mach-shmobile/platsmp-apmu.c
@@ -191,6 +191,7 @@ static void __init shmobile_smp_apmu_setup_boot(void)
 {
 	/* install boot code shared by all CPUs */
 	shmobile_boot_fn = __pa_symbol(shmobile_smp_boot);
+	shmobile_boot_fn_gen2 = shmobile_boot_fn;
 }
 
 void __init shmobile_smp_apmu_prepare_cpus(unsigned int max_cpus,
diff --git a/arch/arm/mach-shmobile/pm-rcar-gen2.c b/arch/arm/mach-shmobile/pm-rcar-gen2.c
index e5f215c..bfad202 100644
--- a/arch/arm/mach-shmobile/pm-rcar-gen2.c
+++ b/arch/arm/mach-shmobile/pm-rcar-gen2.c
@@ -17,6 +17,7 @@
 #include <linux/smp.h>
 #include <linux/soc/renesas/rcar-sysc.h>
 #include <asm/io.h>
+#include <asm/cputype.h>
 #include "common.h"
 #include "rcar-gen2.h"
 
@@ -37,7 +38,6 @@
 #define CA7RESCNT_CODE	0x5a5a0000
 #define CA7RESCNT_CPUS	0xf		/* CPU0-3 */
 
-
 /* On-chip RAM */
 #define ICRAM1		0xe63c0000	/* Inter Connect RAM1 (4 KiB) */
 
@@ -119,8 +119,15 @@ void __init rcar_gen2_pm_init(void)
 	p = ioremap(res.start, resource_size(&res));
 	if (!p)
 		return;
-
-	memcpy_toio(p, shmobile_boot_vector, shmobile_boot_size);
+	/* install the reset vector, use the largest version if we have enough
+	 * memory available */
+	if (resource_size(&res) >= shmobile_boot_size_gen2) {
+		shmobile_boot_cpu_gen2 = read_cpuid_mpidr();
+		memcpy_toio(p, shmobile_boot_vector_gen2,
+			    shmobile_boot_size_gen2);
+	} else {
+		memcpy_toio(p, shmobile_boot_vector, shmobile_boot_size);
+	}
 	iounmap(p);
 
 	/* setup reset vectors */
-- 
2.7.4

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[RFC v4 11/26] dt-bindings: watchdog: renesas-wdt: Add R-Car Gen2 support

[Fabrizio Castro]

This commit documents the compatibility with R-Car Gen2 and RZ/G
devices by defining the generic compatible string "renesas,rcar-gen2-wdt".
Also, this patch expands the list of SoC-specific compatible strings to
include RZ/G and R-Car Gen2 devices.

Signed-off-by: Fabrizio Castro <fabrizio.castro-kTT6dE0pTRh9uiUsa/gSgQ@public.gmane.org>
Signed-off-by: Ramesh Shanmugasundaram <ramesh.shanmugasundaram-kTT6dE0pTRh9uiUsa/gSgQ@public.gmane.org>
Reviewed-by: Geert Uytterhoeven <geert+renesas-gXvu3+zWzMSzQB+pC5nmwQ@public.gmane.org>
---
v3->4:
* Reinstated lost "renesas,rza-wdt" compatible string

 .../devicetree/bindings/watchdog/renesas-wdt.txt      | 19 ++++++++++++++-----
 1 file changed, 14 insertions(+), 5 deletions(-)

diff --git a/Documentation/devicetree/bindings/watchdog/renesas-wdt.txt b/Documentation/devicetree/bindings/watchdog/renesas-wdt.txt
index bf6d1ca..4815128 100644
--- a/Documentation/devicetree/bindings/watchdog/renesas-wdt.txt
+++ b/Documentation/devicetree/bindings/watchdog/renesas-wdt.txt
@@ -1,17 +1,26 @@
 Renesas Watchdog Timer (WDT) Controller
 
 Required properties:
-- compatible : Should be "renesas,<soctype>-wdt", and
-	       "renesas,rcar-gen3-wdt" or "renesas,rza-wdt" as fallback.
+ - compatible : Must be "renesas,<soctype>-wdt", followed by a generic
+		fallback compatible string when compatible with the generic
+		version.
 	       Examples with soctypes are:
+		 - "renesas,r8a7743-wdt" (RZ/G1M)
+		 - "renesas,r8a7745-wdt" (RZ/G1E)
+	         - "renesas,r8a7790-wdt" (R-Car H2)
+	         - "renesas,r8a7791-wdt" (R-Car M2-W)
+	         - "renesas,r8a7792-wdt" (R-Car V2H)
+	         - "renesas,r8a7793-wdt" (R-Car M2-N)
+	         - "renesas,r8a7794-wdt" (R-Car E2)
 	         - "renesas,r8a7795-wdt" (R-Car H3)
 	         - "renesas,r8a7796-wdt" (R-Car M3-W)
 	         - "renesas,r8a77995-wdt" (R-Car D3)
 	         - "renesas,r7s72100-wdt" (RZ/A1)
+		The generic compatible string must be:
+		 - "renesas,rza-wdt" for RZ/A
+		 - "renesas,rcar-gen2-wdt" for R-Car Gen2 and RZ/G
+		 - "renesas,rcar-gen3-wdt" for R-Car Gen3
 
-  When compatible with the generic version, nodes must list the SoC-specific
-  version corresponding to the platform first, followed by the generic
-  version.
 
 - reg : Should contain WDT registers location and length
 - clocks : the clock feeding the watchdog timer.
-- 
2.7.4

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[RFC v4 12/26] watchdog: renesas_wdt: Add R-Car Gen2 support

[Fabrizio Castro]

Due to commits:
* "ARM: shmobile: Add watchdog support",
* "ARM: shmobile: rcar-gen2: Add watchdog support", and
* "soc: renesas: rcar-rst: Enable watchdog as reset trigger for Gen2",
we now have everything we needed for the watchdog to work on Gen2 and
RZ/G1.

This commit adds "renesas,rcar-gen2-wdt" as compatible string for R-Car
Gen2 and RZ/G1, and since on those platforms the rwdt clock needs to be
always ON, when suspending to RAM we need to explicitly disable the
counting by clearing TME from RWTCSRA.

Signed-off-by: Fabrizio Castro <fabrizio.castro-kTT6dE0pTRh9uiUsa/gSgQ@public.gmane.org>
Signed-off-by: Ramesh Shanmugasundaram <ramesh.shanmugasundaram-kTT6dE0pTRh9uiUsa/gSgQ@public.gmane.org>
---
v3->4:
* in this new version the changes to the driver have been splitted into
  two commits, this patch takes care of the basic Gen2 support, patch 13/26
  takes care of the restart handler.

 drivers/watchdog/renesas_wdt.c | 42 +++++++++++++++++++++++++++++++++++++-----
 1 file changed, 37 insertions(+), 5 deletions(-)

diff --git a/drivers/watchdog/renesas_wdt.c b/drivers/watchdog/renesas_wdt.c
index 831ef83..0a1a402 100644
--- a/drivers/watchdog/renesas_wdt.c
+++ b/drivers/watchdog/renesas_wdt.c
@@ -203,13 +203,42 @@ static int rwdt_remove(struct platform_device *pdev)
 	return 0;
 }
 
-/*
- * This driver does also fit for R-Car Gen2 (r8a779[0-4]) WDT. However, for SMP
- * to work there, one also needs a RESET (RST) driver which does not exist yet
- * due to HW issues. This needs to be solved before adding compatibles here.
- */
+#ifdef CONFIG_PM
+static int rwdt_suspend(struct device *dev)
+{
+	struct platform_device *pdev;
+	struct rwdt_priv *priv;
+
+	pdev = to_platform_device(dev);
+	priv = platform_get_drvdata(pdev);
+	if (watchdog_active(&priv->wdev)) {
+		rwdt_write(priv, priv->cks, RWTCSRA);
+	}
+	return 0;
+}
+
+static int rwdt_resume(struct device *dev)
+{
+	struct platform_device *pdev;
+	struct rwdt_priv *priv;
+
+	pdev = to_platform_device(dev);
+	priv = platform_get_drvdata(pdev);
+	if (watchdog_active(&priv->wdev)) {
+		rwdt_write(priv, priv->cks | RWTCSRA_TME, RWTCSRA);
+	}
+	return 0;
+}
+
+static const struct dev_pm_ops rwdt_pm = {
+	.suspend = rwdt_suspend,
+	.resume = rwdt_resume,
+};
+#endif
+
 static const struct of_device_id rwdt_ids[] = {
 	{ .compatible = "renesas,rcar-gen3-wdt", },
+	{ .compatible = "renesas,rcar-gen2-wdt", },
 	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, rwdt_ids);
@@ -218,6 +247,9 @@ static struct platform_driver rwdt_driver = {
 	.driver = {
 		.name = "renesas_wdt",
 		.of_match_table = rwdt_ids,
+#ifdef CONFIG_PM
+		.pm = &rwdt_pm,
+#endif
 	},
 	.probe = rwdt_probe,
 	.remove = rwdt_remove,
-- 
2.7.4

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[RFC v4 13/26] watchdog: renesas_wdt: Add restart handler

[Fabrizio Castro]

On iWave's boards iwg20d and iwg22d the only way to reboot the system is
by means of the watchdog.
This patch adds a restart handler to rwdt_ops, and also makes sure we
keep its priority to a medium level, in order to not override other more
effective handlers.

Signed-off-by: Fabrizio Castro <fabrizio.castro-kTT6dE0pTRh9uiUsa/gSgQ@public.gmane.org>
Signed-off-by: Ramesh Shanmugasundaram <ramesh.shanmugasundaram-kTT6dE0pTRh9uiUsa/gSgQ@public.gmane.org>
---
v3->v4:
* New patch spawn out from patch 12/16. The restart handler on Gen3 is
  controversial, hopefully this patch will help finalizing the discussion.

 drivers/watchdog/renesas_wdt.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/drivers/watchdog/renesas_wdt.c b/drivers/watchdog/renesas_wdt.c
index 0a1a402..6d1c4b9 100644
--- a/drivers/watchdog/renesas_wdt.c
+++ b/drivers/watchdog/renesas_wdt.c
@@ -107,6 +107,24 @@ static unsigned int rwdt_get_timeleft(struct watchdog_device *wdev)
 	return DIV_BY_CLKS_PER_SEC(priv, 65536 - val);
 }
 
+static int rwdt_restart(struct watchdog_device *wdev, unsigned long action,
+			void *data)
+{
+	struct rwdt_priv *priv = watchdog_get_drvdata(wdev);
+
+	pm_runtime_get_sync(wdev->parent);
+
+	rwdt_write(priv, 0x00, RWTCSRB);
+	rwdt_write(priv, 0x00, RWTCSRA);
+	rwdt_write(priv, 0xffff, RWTCNT);
+
+	while (readb_relaxed(priv->base + RWTCSRA) & RWTCSRA_WRFLG)
+		cpu_relax();
+
+	rwdt_write(priv, 0x80, RWTCSRA);
+	return 0;
+}
+
 static const struct watchdog_info rwdt_ident = {
 	.options = WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT,
 	.identity = "Renesas WDT Watchdog",
@@ -118,6 +136,7 @@ static const struct watchdog_ops rwdt_ops = {
 	.stop = rwdt_stop,
 	.ping = rwdt_init_timeout,
 	.get_timeleft = rwdt_get_timeleft,
+	.restart = rwdt_restart,
 };
 
 static int rwdt_probe(struct platform_device *pdev)
@@ -176,6 +195,7 @@ static int rwdt_probe(struct platform_device *pdev)
 	platform_set_drvdata(pdev, priv);
 	watchdog_set_drvdata(&priv->wdev, priv);
 	watchdog_set_nowayout(&priv->wdev, nowayout);
+	watchdog_set_restart_priority(&priv->wdev, 128);
 
 	/* This overrides the default timeout only if DT configuration was found */
 	ret = watchdog_init_timeout(&priv->wdev, 0, &pdev->dev);
-- 
2.7.4

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[RFC v4 14/26] ARM: shmobile: defconfig: Enable RENESAS_WDT_GEN

[Fabrizio Castro]

R-Car Gen2 and RZ/G1 platforms come with a watchdog IP, therefore enable
its driver by default.

Signed-off-by: Fabrizio Castro <fabrizio.castro-kTT6dE0pTRh9uiUsa/gSgQ@public.gmane.org>
Signed-off-by: Ramesh Shanmugasundaram <ramesh.shanmugasundaram-kTT6dE0pTRh9uiUsa/gSgQ@public.gmane.org>
---
v3->4:
* no change

 arch/arm/configs/shmobile_defconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/configs/shmobile_defconfig b/arch/arm/configs/shmobile_defconfig
index 578434c..d5cdad8 100644
--- a/arch/arm/configs/shmobile_defconfig
+++ b/arch/arm/configs/shmobile_defconfig
@@ -132,6 +132,7 @@ CONFIG_CPU_THERMAL=y
 CONFIG_RCAR_THERMAL=y
 CONFIG_WATCHDOG=y
 CONFIG_DA9063_WATCHDOG=y
+CONFIG_RENESAS_WDT=y
 CONFIG_MFD_AS3711=y
 CONFIG_MFD_DA9063=y
 CONFIG_REGULATOR_FIXED_VOLTAGE=y
-- 
2.7.4

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[RFC v4 15/26] clk: renesas: r8a7743: Add rwdt clock

[Fabrizio Castro]

Add "rwdt" clock to r8a7743_mod_clks. Also, since we may need to access
the watchdog registers at any time, declare the clock as critical.

Signed-off-by: Fabrizio Castro <fabrizio.castro@bp.renesas.com>
Signed-off-by: Ramesh Shanmugasundaram <ramesh.shanmugasundaram@bp.renesas.com>
---
v3->4:
* no change

 drivers/clk/renesas/r8a7743-cpg-mssr.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/clk/renesas/r8a7743-cpg-mssr.c b/drivers/clk/renesas/r8a7743-cpg-mssr.c
index 6dc0b30..d3c8b1e 100644
--- a/drivers/clk/renesas/r8a7743-cpg-mssr.c
+++ b/drivers/clk/renesas/r8a7743-cpg-mssr.c
@@ -117,6 +117,7 @@ static const struct mssr_mod_clk r8a7743_mod_clks[] __initconst = {
 	DEF_MOD("cmt1",			 329,	R8A7743_CLK_R),
 	DEF_MOD("usbhs-dmac0",		 330,	R8A7743_CLK_HP),
 	DEF_MOD("usbhs-dmac1",		 331,	R8A7743_CLK_HP),
+	DEF_MOD("rwdt",			 402,	R8A7743_CLK_R),
 	DEF_MOD("irqc",			 407,	R8A7743_CLK_CP),
 	DEF_MOD("intc-sys",		 408,	R8A7743_CLK_ZS),
 	DEF_MOD("audio-dmac1",		 501,	R8A7743_CLK_HP),
@@ -195,6 +196,7 @@ static const struct mssr_mod_clk r8a7743_mod_clks[] __initconst = {
 };
 
 static const unsigned int r8a7743_crit_mod_clks[] __initconst = {
+	MOD_CLK_ID(402),	/* RWDT */
 	MOD_CLK_ID(408),	/* INTC-SYS (GIC) */
 };
 
-- 
2.7.4

[RFC v4 16/26] clk: renesas: r8a7745: Add rwdt clock

[Fabrizio Castro]

Add "rwdt" clock to r8a7745_mod_clks. Also, since we may need to access
the watchdog registers at any time, declare the clock as critical.

Signed-off-by: Fabrizio Castro <fabrizio.castro-kTT6dE0pTRh9uiUsa/gSgQ@public.gmane.org>
Signed-off-by: Ramesh Shanmugasundaram <ramesh.shanmugasundaram-kTT6dE0pTRh9uiUsa/gSgQ@public.gmane.org>
---
v3->4:
* no change

 drivers/clk/renesas/r8a7745-cpg-mssr.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/clk/renesas/r8a7745-cpg-mssr.c b/drivers/clk/renesas/r8a7745-cpg-mssr.c
index 2859504..87f5a36 100644
--- a/drivers/clk/renesas/r8a7745-cpg-mssr.c
+++ b/drivers/clk/renesas/r8a7745-cpg-mssr.c
@@ -114,6 +114,7 @@ static const struct mssr_mod_clk r8a7745_mod_clks[] __initconst = {
 	DEF_MOD("cmt1",			 329,	R8A7745_CLK_R),
 	DEF_MOD("usbhs-dmac0",		 330,	R8A7745_CLK_HP),
 	DEF_MOD("usbhs-dmac1",		 331,	R8A7745_CLK_HP),
+	DEF_MOD("rwdt",			 402,	R8A7745_CLK_R),
 	DEF_MOD("irqc",			 407,	R8A7745_CLK_CP),
 	DEF_MOD("intc-sys",		 408,	R8A7745_CLK_ZS),
 	DEF_MOD("audio-dmac0",		 502,	R8A7745_CLK_HP),
@@ -180,6 +181,7 @@ static const struct mssr_mod_clk r8a7745_mod_clks[] __initconst = {
 };
 
 static const unsigned int r8a7745_crit_mod_clks[] __initconst = {
+	MOD_CLK_ID(402),	/* RWDT */
 	MOD_CLK_ID(408),	/* INTC-SYS (GIC) */
 };
 
-- 
2.7.4

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[RFC v4 17/26] clk: renesas: r8a7790: Add rwdt clock

[Fabrizio Castro]

Add "rwdt" clock to r8a7790_mod_clks. Also, since we may need to access
the watchdog registers at any time, declare the clock as critical.

Signed-off-by: Fabrizio Castro <fabrizio.castro@bp.renesas.com>
Signed-off-by: Ramesh Shanmugasundaram <ramesh.shanmugasundaram@bp.renesas.com>
---
v3->4:
* no change

 drivers/clk/renesas/r8a7790-cpg-mssr.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/clk/renesas/r8a7790-cpg-mssr.c b/drivers/clk/renesas/r8a7790-cpg-mssr.c
index 46bb55b..f936cb7 100644
--- a/drivers/clk/renesas/r8a7790-cpg-mssr.c
+++ b/drivers/clk/renesas/r8a7790-cpg-mssr.c
@@ -140,6 +140,7 @@ static const struct mssr_mod_clk r8a7790_mod_clks[] __initconst = {
 	DEF_MOD("cmt1",			 329,	R8A7790_CLK_R),
 	DEF_MOD("usbhs-dmac0",		 330,	R8A7790_CLK_HP),
 	DEF_MOD("usbhs-dmac1",		 331,	R8A7790_CLK_HP),
+	DEF_MOD("rwdt",			 402,	R8A7790_CLK_R),
 	DEF_MOD("irqc",			 407,	R8A7790_CLK_CP),
 	DEF_MOD("intc-sys",		 408,	R8A7790_CLK_ZS),
 	DEF_MOD("audio-dmac1",		 501,	R8A7790_CLK_HP),
@@ -211,6 +212,7 @@ static const struct mssr_mod_clk r8a7790_mod_clks[] __initconst = {
 };
 
 static const unsigned int r8a7790_crit_mod_clks[] __initconst = {
+	MOD_CLK_ID(402),	/* RWDT */
 	MOD_CLK_ID(408),	/* INTC-SYS (GIC) */
 };
 
-- 
2.7.4

[RFC v4 18/26] clk: renesas: r8a7791/r8a7793: Add rwdt clock

[Fabrizio Castro]

Add "rwdt" clock to r8a7791_mod_clks. Also, since we may need to access
the watchdog registers at any time, declare the clock as critical.

Signed-off-by: Fabrizio Castro <fabrizio.castro-kTT6dE0pTRh9uiUsa/gSgQ@public.gmane.org>
Signed-off-by: Ramesh Shanmugasundaram <ramesh.shanmugasundaram-kTT6dE0pTRh9uiUsa/gSgQ@public.gmane.org>
---
v3->4:
* no change

 drivers/clk/renesas/r8a7791-cpg-mssr.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/clk/renesas/r8a7791-cpg-mssr.c b/drivers/clk/renesas/r8a7791-cpg-mssr.c
index c0b51f9..820b220 100644
--- a/drivers/clk/renesas/r8a7791-cpg-mssr.c
+++ b/drivers/clk/renesas/r8a7791-cpg-mssr.c
@@ -128,6 +128,7 @@ static const struct mssr_mod_clk r8a7791_mod_clks[] __initconst = {
 	DEF_MOD("cmt1",			 329,	R8A7791_CLK_R),
 	DEF_MOD("usbhs-dmac0",		 330,	R8A7791_CLK_HP),
 	DEF_MOD("usbhs-dmac1",		 331,	R8A7791_CLK_HP),
+	DEF_MOD("rwdt",			 402,	R8A7791_CLK_R),
 	DEF_MOD("irqc",			 407,	R8A7791_CLK_CP),
 	DEF_MOD("intc-sys",		 408,	R8A7791_CLK_ZS),
 	DEF_MOD("audio-dmac1",		 501,	R8A7791_CLK_HP),
@@ -209,6 +210,7 @@ static const struct mssr_mod_clk r8a7791_mod_clks[] __initconst = {
 };
 
 static const unsigned int r8a7791_crit_mod_clks[] __initconst = {
+	MOD_CLK_ID(402),	/* RWDT */
 	MOD_CLK_ID(408),	/* INTC-SYS (GIC) */
 };
 
-- 
2.7.4

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[RFC v4 19/26] clk: renesas: r8a7794: Add rwdt clock

[Fabrizio Castro]

Add "rwdt" clock to r8a7794_mod_clks. Also, since we may need to access
the watchdog registers at any time, declare the clock as critical.

Signed-off-by: Fabrizio Castro <fabrizio.castro@bp.renesas.com>
Signed-off-by: Ramesh Shanmugasundaram <ramesh.shanmugasundaram@bp.renesas.com>
---
v3->4:
* no change

 drivers/clk/renesas/r8a7794-cpg-mssr.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/clk/renesas/r8a7794-cpg-mssr.c b/drivers/clk/renesas/r8a7794-cpg-mssr.c
index ec091a4..2a40bbe 100644
--- a/drivers/clk/renesas/r8a7794-cpg-mssr.c
+++ b/drivers/clk/renesas/r8a7794-cpg-mssr.c
@@ -121,6 +121,7 @@ static const struct mssr_mod_clk r8a7794_mod_clks[] __initconst = {
 	DEF_MOD("cmt1",			 329,	R8A7794_CLK_R),
 	DEF_MOD("usbhs-dmac0",		 330,	R8A7794_CLK_HP),
 	DEF_MOD("usbhs-dmac1",		 331,	R8A7794_CLK_HP),
+	DEF_MOD("rwdt",			 402,	R8A7794_CLK_R),
 	DEF_MOD("irqc",			 407,	R8A7794_CLK_CP),
 	DEF_MOD("intc-sys",		 408,	R8A7794_CLK_ZS),
 	DEF_MOD("audio-dmac0",		 502,	R8A7794_CLK_HP),
@@ -190,6 +191,7 @@ static const struct mssr_mod_clk r8a7794_mod_clks[] __initconst = {
 };
 
 static const unsigned int r8a7794_crit_mod_clks[] __initconst = {
+	MOD_CLK_ID(402),	/* RWDT */
 	MOD_CLK_ID(408),	/* INTC-SYS (GIC) */
 };
 
-- 
2.7.4

[RFC v4 20/26] ARM: dts: r8a7743: Add watchdog support to SoC dtsi

[Fabrizio Castro]

This patch adds watchdog support to the r8a7743 SoC dtsi.

Signed-off-by: Fabrizio Castro <fabrizio.castro-kTT6dE0pTRh9uiUsa/gSgQ@public.gmane.org>
Signed-off-by: Ramesh Shanmugasundaram <ramesh.shanmugasundaram-kTT6dE0pTRh9uiUsa/gSgQ@public.gmane.org>
Reviewed-by: Geert Uytterhoeven <geert+renesas-gXvu3+zWzMSzQB+pC5nmwQ@public.gmane.org>
---
v3->4:
* no change

 arch/arm/boot/dts/r8a7743.dtsi | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/arch/arm/boot/dts/r8a7743.dtsi b/arch/arm/boot/dts/r8a7743.dtsi
index c2943d7..1d4505f 100644
--- a/arch/arm/boot/dts/r8a7743.dtsi
+++ b/arch/arm/boot/dts/r8a7743.dtsi
@@ -368,6 +368,16 @@
 			reg = <0 0xe6160000 0 0x100>;
 		};
 
+		rwdt: watchdog@e6020000 {
+			compatible = "renesas,r8a7743-wdt",
+				     "renesas,rcar-gen2-wdt";
+			reg = <0 0xe6020000 0 0x0c>;
+			clocks = <&cpg CPG_MOD 402>;
+			power-domains = <&sysc R8A7743_PD_ALWAYS_ON>;
+			resets = <&cpg 402>;
+			status = "disabled";
+		};
+
 		sysc: system-controller@e6180000 {
 			compatible = "renesas,r8a7743-sysc";
 			reg = <0 0xe6180000 0 0x200>;
-- 
2.7.4

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[RFC v4 21/26] ARM: dts: r8a7745: Add watchdog support to SoC dtsi

[Fabrizio Castro]

This patch adds watchdog support to the r8a7745 SoC dtsi.

Signed-off-by: Fabrizio Castro <fabrizio.castro-kTT6dE0pTRh9uiUsa/gSgQ@public.gmane.org>
Signed-off-by: Ramesh Shanmugasundaram <ramesh.shanmugasundaram-kTT6dE0pTRh9uiUsa/gSgQ@public.gmane.org>
Reviewed-by: Geert Uytterhoeven <geert+renesas-gXvu3+zWzMSzQB+pC5nmwQ@public.gmane.org>
---
v3->4:
* no change

 arch/arm/boot/dts/r8a7745.dtsi | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/arch/arm/boot/dts/r8a7745.dtsi b/arch/arm/boot/dts/r8a7745.dtsi
index 6bc1cf4..5d1b8f2 100644
--- a/arch/arm/boot/dts/r8a7745.dtsi
+++ b/arch/arm/boot/dts/r8a7745.dtsi
@@ -321,6 +321,16 @@
 			reg = <0 0xe6160000 0 0x100>;
 		};
 
+		rwdt: watchdog@e6020000 {
+			compatible = "renesas,r8a7745-wdt",
+				     "renesas,rcar-gen2-wdt";
+			reg = <0 0xe6020000 0 0x0c>;
+			clocks = <&cpg CPG_MOD 402>;
+			power-domains = <&sysc R8A7745_PD_ALWAYS_ON>;
+			resets = <&cpg 402>;
+			status = "disabled";
+		};
+
 		sysc: system-controller@e6180000 {
 			compatible = "renesas,r8a7745-sysc";
 			reg = <0 0xe6180000 0 0x200>;
-- 
2.7.4

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[RFC v4 22/26] ARM: dts: r8a7790: Add watchdog support to SoC dtsi

[Fabrizio Castro]

This commit adds watchdog support to the r8a7790 dtsi.

Signed-off-by: Fabrizio Castro <fabrizio.castro-kTT6dE0pTRh9uiUsa/gSgQ@public.gmane.org>
Signed-off-by: Ramesh Shanmugasundaram <ramesh.shanmugasundaram-kTT6dE0pTRh9uiUsa/gSgQ@public.gmane.org>
Reviewed-by: Geert Uytterhoeven <geert+renesas-gXvu3+zWzMSzQB+pC5nmwQ@public.gmane.org>
---
v3->4:
* no change

 arch/arm/boot/dts/r8a7790.dtsi | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/arch/arm/boot/dts/r8a7790.dtsi b/arch/arm/boot/dts/r8a7790.dtsi
index a84bf35..83d6704 100644
--- a/arch/arm/boot/dts/r8a7790.dtsi
+++ b/arch/arm/boot/dts/r8a7790.dtsi
@@ -218,6 +218,16 @@
 		#size-cells = <2>;
 		ranges;
 
+		rwdt: watchdog@e6020000 {
+			compatible = "renesas,r8a7790-wdt",
+				     "renesas,rcar-gen2-wdt";
+			reg = <0 0xe6020000 0 0x0c>;
+			clocks = <&cpg CPG_MOD 402>;
+			power-domains = <&sysc R8A7790_PD_ALWAYS_ON>;
+			resets = <&cpg 402>;
+			status = "disabled";
+		};
+
 		gpio0: gpio@e6050000 {
 			compatible = "renesas,gpio-r8a7790",
 				     "renesas,rcar-gen2-gpio";
-- 
2.7.4

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[RFC v4 23/26] ARM: dts: r8a7791: Add watchdog support to SoC dtsi

[Fabrizio Castro]

This commit adds watchdog support to the r8a7791 dtsi.

Signed-off-by: Fabrizio Castro <fabrizio.castro-kTT6dE0pTRh9uiUsa/gSgQ@public.gmane.org>
Signed-off-by: Ramesh Shanmugasundaram <ramesh.shanmugasundaram-kTT6dE0pTRh9uiUsa/gSgQ@public.gmane.org>
Reviewed-by: Geert Uytterhoeven <geert+renesas-gXvu3+zWzMSzQB+pC5nmwQ@public.gmane.org>
---
v3->4:
* no change

 arch/arm/boot/dts/r8a7791.dtsi | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/arch/arm/boot/dts/r8a7791.dtsi b/arch/arm/boot/dts/r8a7791.dtsi
index d2a4546..80e20ecd 100644
--- a/arch/arm/boot/dts/r8a7791.dtsi
+++ b/arch/arm/boot/dts/r8a7791.dtsi
@@ -142,6 +142,16 @@
 		#size-cells = <2>;
 		ranges;
 
+		rwdt: watchdog@e6020000 {
+			compatible = "renesas,r8a7791-wdt",
+				     "renesas,rcar-gen2-wdt";
+			reg = <0 0xe6020000 0 0x0c>;
+			clocks = <&cpg CPG_MOD 402>;
+			power-domains = <&sysc R8A7791_PD_ALWAYS_ON>;
+			resets = <&cpg 402>;
+			status = "disabled";
+		};
+
 		gpio0: gpio@e6050000 {
 			compatible = "renesas,gpio-r8a7791",
 				     "renesas,rcar-gen2-gpio";
-- 
2.7.4

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[RFC v4 24/26] ARM: dts: r8a7794: Add watchdog support to SoC dtsi

[Fabrizio Castro]

This commit adds watchdog support to the r8a7794 dtsi.

Signed-off-by: Fabrizio Castro <fabrizio.castro@bp.renesas.com>
Signed-off-by: Ramesh Shanmugasundaram <ramesh.shanmugasundaram@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
---
v3->4:
* no change

 arch/arm/boot/dts/r8a7794.dtsi | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/arch/arm/boot/dts/r8a7794.dtsi b/arch/arm/boot/dts/r8a7794.dtsi
index e47c5f4..1c9b149 100644
--- a/arch/arm/boot/dts/r8a7794.dtsi
+++ b/arch/arm/boot/dts/r8a7794.dtsi
@@ -119,6 +119,16 @@
 		#size-cells = <2>;
 		ranges;
 
+		rwdt: watchdog@e6020000 {
+			compatible = "renesas,r8a7794-wdt",
+				     "renesas,rcar-gen2-wdt";
+			reg = <0 0xe6020000 0 0x0c>;
+			clocks = <&cpg CPG_MOD 402>;
+			power-domains = <&sysc R8A7794_PD_ALWAYS_ON>;
+			resets = <&cpg 402>;
+			status = "disabled";
+		};
+
 		gpio0: gpio@e6050000 {
 			compatible = "renesas,gpio-r8a7794",
 				     "renesas,rcar-gen2-gpio";
-- 
2.7.4

[RFC v4 25/26] ARM: dts: iwg20m: Add watchdog support to SoM dtsi

[Fabrizio Castro]

This patch enables the watchdog from within the iwg20m SoM dtsi.

Signed-off-by: Fabrizio Castro <fabrizio.castro@bp.renesas.com>
Signed-off-by: Ramesh Shanmugasundaram <ramesh.shanmugasundaram@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
---
v3->4:
* no change

 arch/arm/boot/dts/r8a7743-iwg20m.dtsi | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/arm/boot/dts/r8a7743-iwg20m.dtsi b/arch/arm/boot/dts/r8a7743-iwg20m.dtsi
index 1d3e950..d364685 100644
--- a/arch/arm/boot/dts/r8a7743-iwg20m.dtsi
+++ b/arch/arm/boot/dts/r8a7743-iwg20m.dtsi
@@ -91,6 +91,11 @@
 	};
 };
 
+&rwdt {
+	timeout-sec = <60>;
+	status = "okay";
+};
+
 &sdhi0 {
 	pinctrl-0 = <&sdhi0_pins>;
 	pinctrl-names = "default";
-- 
2.7.4

[RFC v4 26/26] ARM: dts: iwg22m: Add watchdog support to SoM dtsi

[Fabrizio Castro]

This patch enables the watchdog from within the iwg20m SoM dtsi.

Signed-off-by: Fabrizio Castro <fabrizio.castro-kTT6dE0pTRh9uiUsa/gSgQ@public.gmane.org>
Signed-off-by: Ramesh Shanmugasundaram <ramesh.shanmugasundaram-kTT6dE0pTRh9uiUsa/gSgQ@public.gmane.org>
Reviewed-by: Geert Uytterhoeven <geert+renesas-gXvu3+zWzMSzQB+pC5nmwQ@public.gmane.org>
---
v3->4:
* no change

 arch/arm/boot/dts/r8a7745-iwg22m.dtsi | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/arm/boot/dts/r8a7745-iwg22m.dtsi b/arch/arm/boot/dts/r8a7745-iwg22m.dtsi
index 8d0a392b..29b6e10 100644
--- a/arch/arm/boot/dts/r8a7745-iwg22m.dtsi
+++ b/arch/arm/boot/dts/r8a7745-iwg22m.dtsi
@@ -91,6 +91,11 @@
 	};
 };
 
+&rwdt {
+	timeout-sec = <60>;
+	status = "okay";
+};
+
 &sdhi1 {
 	pinctrl-0 = <&sdhi1_pins>;
 	pinctrl-names = "default";
-- 
2.7.4

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Re: [RFC v4 12/26] watchdog: renesas_wdt: Add R-Car Gen2 support

[Guenter Roeck]

On 01/31/2018 10:24 AM, Fabrizio Castro wrote:
> Due to commits:
> * "ARM: shmobile: Add watchdog support",
> * "ARM: shmobile: rcar-gen2: Add watchdog support", and
> * "soc: renesas: rcar-rst: Enable watchdog as reset trigger for Gen2",
> we now have everything we needed for the watchdog to work on Gen2 and
> RZ/G1.
> 
> This commit adds "renesas,rcar-gen2-wdt" as compatible string for R-Car
> Gen2 and RZ/G1, and since on those platforms the rwdt clock needs to be
> always ON, when suspending to RAM we need to explicitly disable the
> counting by clearing TME from RWTCSRA.
> 
> Signed-off-by: Fabrizio Castro <fabrizio.castro-kTT6dE0pTRh9uiUsa/gSgQ@public.gmane.org>
> Signed-off-by: Ramesh Shanmugasundaram <ramesh.shanmugasundaram-kTT6dE0pTRh9uiUsa/gSgQ@public.gmane.org>
> ---
> v3->4:
> * in this new version the changes to the driver have been splitted into
>    two commits, this patch takes care of the basic Gen2 support, patch 13/26
>    takes care of the restart handler.
> 
>   drivers/watchdog/renesas_wdt.c | 42 +++++++++++++++++++++++++++++++++++++-----
>   1 file changed, 37 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/watchdog/renesas_wdt.c b/drivers/watchdog/renesas_wdt.c
> index 831ef83..0a1a402 100644
> --- a/drivers/watchdog/renesas_wdt.c
> +++ b/drivers/watchdog/renesas_wdt.c
> @@ -203,13 +203,42 @@ static int rwdt_remove(struct platform_device *pdev)
>   	return 0;
>   }
>   
> -/*
> - * This driver does also fit for R-Car Gen2 (r8a779[0-4]) WDT. However, for SMP
> - * to work there, one also needs a RESET (RST) driver which does not exist yet
> - * due to HW issues. This needs to be solved before adding compatibles here.
> - */
> +#ifdef CONFIG_PM
> +static int rwdt_suspend(struct device *dev)
> +{
> +	struct platform_device *pdev;
> +	struct rwdt_priv *priv;
> +
> +	pdev = to_platform_device(dev);
> +	priv = platform_get_drvdata(pdev);
> +	if (watchdog_active(&priv->wdev)) {
> +		rwdt_write(priv, priv->cks, RWTCSRA);
> +	}

Unnecessary { }

> +	return 0;
> +}
> +
> +static int rwdt_resume(struct device *dev)
> +{
> +	struct platform_device *pdev;
> +	struct rwdt_priv *priv;
> +
> +	pdev = to_platform_device(dev);
> +	priv = platform_get_drvdata(pdev);
> +	if (watchdog_active(&priv->wdev)) {
> +		rwdt_write(priv, priv->cks | RWTCSRA_TME, RWTCSRA);
> +	}

Same here. FWIW, checkpatch does complain about that.

Guenter
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Re: [RFC v4 13/26] watchdog: renesas_wdt: Add restart handler

[Guenter Roeck]

On 01/31/2018 10:24 AM, Fabrizio Castro wrote:
> On iWave's boards iwg20d and iwg22d the only way to reboot the system is
> by means of the watchdog.
> This patch adds a restart handler to rwdt_ops, and also makes sure we
> keep its priority to a medium level, in order to not override other more
> effective handlers.
> 
> Signed-off-by: Fabrizio Castro <fabrizio.castro-kTT6dE0pTRh9uiUsa/gSgQ@public.gmane.org>
> Signed-off-by: Ramesh Shanmugasundaram <ramesh.shanmugasundaram-kTT6dE0pTRh9uiUsa/gSgQ@public.gmane.org>

Reviewed-by: Guenter Roeck <linux-0h96xk9xTtrk1uMJSBkQmQ@public.gmane.org>

> ---
> v3->v4:
> * New patch spawn out from patch 12/16. The restart handler on Gen3 is
>    controversial, hopefully this patch will help finalizing the discussion.
> 
>   drivers/watchdog/renesas_wdt.c | 20 ++++++++++++++++++++
>   1 file changed, 20 insertions(+)
> 
> diff --git a/drivers/watchdog/renesas_wdt.c b/drivers/watchdog/renesas_wdt.c
> index 0a1a402..6d1c4b9 100644
> --- a/drivers/watchdog/renesas_wdt.c
> +++ b/drivers/watchdog/renesas_wdt.c
> @@ -107,6 +107,24 @@ static unsigned int rwdt_get_timeleft(struct watchdog_device *wdev)
>   	return DIV_BY_CLKS_PER_SEC(priv, 65536 - val);
>   }
>   
> +static int rwdt_restart(struct watchdog_device *wdev, unsigned long action,
> +			void *data)
> +{
> +	struct rwdt_priv *priv = watchdog_get_drvdata(wdev);
> +
> +	pm_runtime_get_sync(wdev->parent);
> +
> +	rwdt_write(priv, 0x00, RWTCSRB);
> +	rwdt_write(priv, 0x00, RWTCSRA);
> +	rwdt_write(priv, 0xffff, RWTCNT);
> +
> +	while (readb_relaxed(priv->base + RWTCSRA) & RWTCSRA_WRFLG)
> +		cpu_relax();
> +
> +	rwdt_write(priv, 0x80, RWTCSRA);
> +	return 0;
> +}
> +
>   static const struct watchdog_info rwdt_ident = {
>   	.options = WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT,
>   	.identity = "Renesas WDT Watchdog",
> @@ -118,6 +136,7 @@ static const struct watchdog_ops rwdt_ops = {
>   	.stop = rwdt_stop,
>   	.ping = rwdt_init_timeout,
>   	.get_timeleft = rwdt_get_timeleft,
> +	.restart = rwdt_restart,
>   };
>   
>   static int rwdt_probe(struct platform_device *pdev)
> @@ -176,6 +195,7 @@ static int rwdt_probe(struct platform_device *pdev)
>   	platform_set_drvdata(pdev, priv);
>   	watchdog_set_drvdata(&priv->wdev, priv);
>   	watchdog_set_nowayout(&priv->wdev, nowayout);
> +	watchdog_set_restart_priority(&priv->wdev, 128);
>   
>   	/* This overrides the default timeout only if DT configuration was found */
>   	ret = watchdog_init_timeout(&priv->wdev, 0, &pdev->dev);
> 

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Re: [RFC v4 11/26] dt-bindings: watchdog: renesas-wdt: Add R-Car Gen2 support

[Rob Herring]

On Wed, Jan 31, 2018 at 06:24:15PM +0000, Fabrizio Castro wrote:
> This commit documents the compatibility with R-Car Gen2 and RZ/G
> devices by defining the generic compatible string "renesas,rcar-gen2-wdt".
> Also, this patch expands the list of SoC-specific compatible strings to
> include RZ/G and R-Car Gen2 devices.
> 
> Signed-off-by: Fabrizio Castro <fabrizio.castro@bp.renesas.com>
> Signed-off-by: Ramesh Shanmugasundaram <ramesh.shanmugasundaram@bp.renesas.com>
> Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
> ---
> v3->4:
> * Reinstated lost "renesas,rza-wdt" compatible string
> 
>  .../devicetree/bindings/watchdog/renesas-wdt.txt      | 19 ++++++++++++++-----
>  1 file changed, 14 insertions(+), 5 deletions(-)

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

RE: [RFC v4 12/26] watchdog: renesas_wdt: Add R-Car Gen2 support

[Fabrizio Castro]

[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #1: Type: text/plain; charset="utf-8", Size: 4318 bytes --]

Hello Guenter,

thank you for your feedback.

> -----Original Message-----
> From: devicetree-owner@vger.kernel.org [mailto:devicetree-owner@vger.kernel.org] On Behalf Of Guenter Roeck
> Sent: 02 February 2018 02:56
> To: Fabrizio Castro <fabrizio.castro@bp.renesas.com>; Philipp Zabel <p.zabel@pengutronix.de>; Rob Herring <robh+dt@kernel.org>;
> Mark Rutland <mark.rutland@arm.com>; Wim Van Sebroeck <wim@iguana.be>; Russell King <linux@armlinux.org.uk>; Catalin
> Marinas <catalin.marinas@arm.com>; Will Deacon <will.deacon@arm.com>; Michael Turquette <mturquette@baylibre.com>;
> Stephen Boyd <sboyd@codeaurora.org>; Simon Horman <horms@verge.net.au>; Magnus Damm <magnus.damm@gmail.com>;
> Geert Uytterhoeven <geert+renesas@glider.be>; Wolfram Sang <wsa+renesas@sang-engineering.com>
> Cc: devicetree@vger.kernel.org; linux-watchdog@vger.kernel.org; linux-renesas-soc@vger.kernel.org; linux-arm-
> kernel@lists.infradead.org; linux-clk@vger.kernel.org; Chris Paterson <Chris.Paterson2@renesas.com>; Biju Das
> <biju.das@bp.renesas.com>; Ramesh Shanmugasundaram <ramesh.shanmugasundaram@bp.renesas.com>
> Subject: Re: [RFC v4 12/26] watchdog: renesas_wdt: Add R-Car Gen2 support
>
> On 01/31/2018 10:24 AM, Fabrizio Castro wrote:
> > Due to commits:
> > * "ARM: shmobile: Add watchdog support",
> > * "ARM: shmobile: rcar-gen2: Add watchdog support", and
> > * "soc: renesas: rcar-rst: Enable watchdog as reset trigger for Gen2",
> > we now have everything we needed for the watchdog to work on Gen2 and
> > RZ/G1.
> >
> > This commit adds "renesas,rcar-gen2-wdt" as compatible string for R-Car
> > Gen2 and RZ/G1, and since on those platforms the rwdt clock needs to be
> > always ON, when suspending to RAM we need to explicitly disable the
> > counting by clearing TME from RWTCSRA.
> >
> > Signed-off-by: Fabrizio Castro <fabrizio.castro@bp.renesas.com>
> > Signed-off-by: Ramesh Shanmugasundaram <ramesh.shanmugasundaram@bp.renesas.com>
> > ---
> > v3->4:
> > * in this new version the changes to the driver have been splitted into
> >    two commits, this patch takes care of the basic Gen2 support, patch 13/26
> >    takes care of the restart handler.
> >
> >   drivers/watchdog/renesas_wdt.c | 42 +++++++++++++++++++++++++++++++++++++-----
> >   1 file changed, 37 insertions(+), 5 deletions(-)
> >
> > diff --git a/drivers/watchdog/renesas_wdt.c b/drivers/watchdog/renesas_wdt.c
> > index 831ef83..0a1a402 100644
> > --- a/drivers/watchdog/renesas_wdt.c
> > +++ b/drivers/watchdog/renesas_wdt.c
> > @@ -203,13 +203,42 @@ static int rwdt_remove(struct platform_device *pdev)
> >   return 0;
> >   }
> >
> > -/*
> > - * This driver does also fit for R-Car Gen2 (r8a779[0-4]) WDT. However, for SMP
> > - * to work there, one also needs a RESET (RST) driver which does not exist yet
> > - * due to HW issues. This needs to be solved before adding compatibles here.
> > - */
> > +#ifdef CONFIG_PM
> > +static int rwdt_suspend(struct device *dev)
> > +{
> > +struct platform_device *pdev;
> > +struct rwdt_priv *priv;
> > +
> > +pdev = to_platform_device(dev);
> > +priv = platform_get_drvdata(pdev);
> > +if (watchdog_active(&priv->wdev)) {
> > +rwdt_write(priv, priv->cks, RWTCSRA);
> > +}
>
> Unnecessary { }
>
> > +return 0;
> > +}
> > +
> > +static int rwdt_resume(struct device *dev)
> > +{
> > +struct platform_device *pdev;
> > +struct rwdt_priv *priv;
> > +
> > +pdev = to_platform_device(dev);
> > +priv = platform_get_drvdata(pdev);
> > +if (watchdog_active(&priv->wdev)) {
> > +rwdt_write(priv, priv->cks | RWTCSRA_TME, RWTCSRA);
> > +}
>
> Same here. FWIW, checkpatch does complain about that.

I will clean this up for the next (and hopefully last) iteration.

Thanks,
Fabrizio

>
> Guenter
> --
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Re: [RFC v4 00/26] Fix watchdog on Renesas R-Car Gen2 and RZ/G1

[Geert Uytterhoeven]

Hi Fabrizio,

On Wed, Jan 31, 2018 at 7:24 PM, Fabrizio Castro
<fabrizio.castro@bp.renesas.com> wrote:
> the forth version of this series aims at consolidating the watchdog fix.
> There is a discussion still in progress about the changes to the
> watchdog driver, please see the following for more information:
> https://patchwork.kernel.org/patch/10192435/
>
> It doesn't look like leaving the restart handler in for Gen3 is going
> to do any harm (but it may be unwelcome), perhaps esplicitly setting
> its priority to a medium level (128) will help its adoption on Gen3
> as well? This is what this particular version is proposing.
>
> Also, although the latest implmentation of the reset vector hasn't
> raised any problem so far, it hasn't received any feedback either.
> Please do look into it to espose problems and weaknesses (if any).
>
> Finally, it would be great if someone could test this patch set on his
> Gen2/Gen3/RZ/G1 board, and it would be awesome if that board was a
> Lager with all of the cores enabled and working at the same time ;-)

I applied your series, made the following change:

--- a/arch/arm/boot/dts/r8a7791-koelsch.dts
+++ b/arch/arm/boot/dts/r8a7791-koelsch.dts
@@ -499,6 +499,11 @@
        status = "okay";
 };

+&rwdt {
+       timeout-sec = <5>;
+       status = "okay";
+};
+
 &sata0 {
        status = "okay";
 };

and tried it on koelsch. Unfortunately it hangs:

    # cat > /dev/watchdog
    [wait 5s]
    [hang]

However, it does work when booted with maxcpus=1, or when built with
CONFIG_SMP=n.

It also works when offlining CPU1 first:

    # echo 0 > /sys/devices/system/cpu/cpu1/online
    #cat > /dev/watchdog
    [wait 5s]
    [reboot]

It does not work when offlining CPU0 first.

This is on r8a7791 ES1.0.

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

Re: [RFC v4 13/26] watchdog: renesas_wdt: Add restart handler

[Geert Uytterhoeven]

Hi Fabrizio,

On Wed, Jan 31, 2018 at 7:24 PM, Fabrizio Castro
<fabrizio.castro@bp.renesas.com> wrote:
> On iWave's boards iwg20d and iwg22d the only way to reboot the system is
> by means of the watchdog.
> This patch adds a restart handler to rwdt_ops, and also makes sure we
> keep its priority to a medium level, in order to not override other more
> effective handlers.
>
> Signed-off-by: Fabrizio Castro <fabrizio.castro@bp.renesas.com>
> Signed-off-by: Ramesh Shanmugasundaram <ramesh.shanmugasundaram@bp.renesas.com>

> --- a/drivers/watchdog/renesas_wdt.c
> +++ b/drivers/watchdog/renesas_wdt.c
> @@ -118,6 +136,7 @@ static const struct watchdog_ops rwdt_ops = {
>         .stop = rwdt_stop,
>         .ping = rwdt_init_timeout,
>         .get_timeleft = rwdt_get_timeleft,
> +       .restart = rwdt_restart,
>  };
>
>  static int rwdt_probe(struct platform_device *pdev)
> @@ -176,6 +195,7 @@ static int rwdt_probe(struct platform_device *pdev)
>         platform_set_drvdata(pdev, priv);
>         watchdog_set_drvdata(&priv->wdev, priv);
>         watchdog_set_nowayout(&priv->wdev, nowayout);
> +       watchdog_set_restart_priority(&priv->wdev, 128);

Given we want to reboot R-Car Gen2 boards equipped with a suitable PMIC
(e.g. DA9063) using that PMIC, I think the priority should be lower (0?),
cfr.

 *   0:   use watchdog's restart function as last resort, has limited restart
 *        capabilies
 *   128: default restart handler, use if no other handler is expected to be
 *        available and/or if restart is sufficient to restart the entire system
 *   255: preempt all other handlers

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

RE: [RFC v4 13/26] watchdog: renesas_wdt: Add restart handler

[Fabrizio Castro]

Hello Geert,

> Subject: Re: [RFC v4 13/26] watchdog: renesas_wdt: Add restart handler
>
> Hi Fabrizio,

Thank you for your feedback!

>
> On Wed, Jan 31, 2018 at 7:24 PM, Fabrizio Castro
> <fabrizio.castro@bp.renesas.com> wrote:
> > On iWave's boards iwg20d and iwg22d the only way to reboot the system is
> > by means of the watchdog.
> > This patch adds a restart handler to rwdt_ops, and also makes sure we
> > keep its priority to a medium level, in order to not override other more
> > effective handlers.
> >
> > Signed-off-by: Fabrizio Castro <fabrizio.castro@bp.renesas.com>
> > Signed-off-by: Ramesh Shanmugasundaram <ramesh.shanmugasundaram@bp.renesas.com>
>
> > --- a/drivers/watchdog/renesas_wdt.c
> > +++ b/drivers/watchdog/renesas_wdt.c
> > @@ -118,6 +136,7 @@ static const struct watchdog_ops rwdt_ops = {
> >         .stop = rwdt_stop,
> >         .ping = rwdt_init_timeout,
> >         .get_timeleft = rwdt_get_timeleft,
> > +       .restart = rwdt_restart,
> >  };
> >
> >  static int rwdt_probe(struct platform_device *pdev)
> > @@ -176,6 +195,7 @@ static int rwdt_probe(struct platform_device *pdev)
> >         platform_set_drvdata(pdev, priv);
> >         watchdog_set_drvdata(&priv->wdev, priv);
> >         watchdog_set_nowayout(&priv->wdev, nowayout);
> > +       watchdog_set_restart_priority(&priv->wdev, 128);
>
> Given we want to reboot R-Car Gen2 boards equipped with a suitable PMIC
> (e.g. DA9063) using that PMIC, I think the priority should be lower (0?),
> cfr.

Yes, can do, I have no strong opinion about this.
I'll use priority 0 for the next submission.

Thanks,
Fab

>
>  *   0:   use watchdog's restart function as last resort, has limited restart
>  *        capabilies
>  *   128: default restart handler, use if no other handler is expected to be
>  *        available and/or if restart is sufficient to restart the entire system
>  *   255: preempt all other handlers
>
> 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



Renesas Electronics Europe Ltd, Dukes Meadow, Millboard Road, Bourne End, Buckinghamshire, SL8 5FH, UK. Registered in England & Wales under Registered No. 04586709.

Re: [RFC v4 12/26] watchdog: renesas_wdt: Add R-Car Gen2 support

[Wolfram Sang]

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> +#ifdef CONFIG_PM
> +static int rwdt_suspend(struct device *dev)
> +{
> +	struct platform_device *pdev;
> +	struct rwdt_priv *priv;
> +
> +	pdev = to_platform_device(dev);
> +	priv = platform_get_drvdata(pdev);

struct rwdt_priv *priv = dev_get_drvdata(dev);

?


> +	if (watchdog_active(&priv->wdev)) {
> +		rwdt_write(priv, priv->cks, RWTCSRA);
> +	}
> +	return 0;
> +}
> +
> +static int rwdt_resume(struct device *dev)
> +{
> +	struct platform_device *pdev;
> +	struct rwdt_priv *priv;
> +
> +	pdev = to_platform_device(dev);
> +	priv = platform_get_drvdata(pdev);

ditto

> +	if (watchdog_active(&priv->wdev)) {
> +		rwdt_write(priv, priv->cks | RWTCSRA_TME, RWTCSRA);
> +	}
> +	return 0;
> +}
> +
> +static const struct dev_pm_ops rwdt_pm = {
> +	.suspend = rwdt_suspend,
> +	.resume = rwdt_resume,
> +};

Use SIMPLE_DEV_PM_OPS macro (see stmp3xxx_rtc_wdt.c for an example) for
more compact code and...

> +#ifdef CONFIG_PM
> +		.pm = &rwdt_pm,
> +#endif

... removing this ifdeffery?


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Re: [RFC v4 13/26] watchdog: renesas_wdt: Add restart handler

[Wolfram Sang]

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> +static int rwdt_restart(struct watchdog_device *wdev, unsigned long action,
> +			void *data)
> +{
> +	struct rwdt_priv *priv = watchdog_get_drvdata(wdev);
> +
> +	pm_runtime_get_sync(wdev->parent);
> +
> +	rwdt_write(priv, 0x00, RWTCSRB);
> +	rwdt_write(priv, 0x00, RWTCSRA);
> +	rwdt_write(priv, 0xffff, RWTCNT);
> +
> +	while (readb_relaxed(priv->base + RWTCSRA) & RWTCSRA_WRFLG)
> +		cpu_relax();
> +
> +	rwdt_write(priv, 0x80, RWTCSRA);
> +	return 0;
> +}

I used to have this simpler version (back then for the UP case):

+	rwdt_start(wdev);
+	rwdt_write(priv, 0xffff, RWTCNT);
+	return 0;

It should still work probably...


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Re: [RFC v4 11/26] dt-bindings: watchdog: renesas-wdt: Add R-Car Gen2 support

[Wolfram Sang]

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On Wed, Jan 31, 2018 at 06:24:15PM +0000, Fabrizio Castro wrote:
> This commit documents the compatibility with R-Car Gen2 and RZ/G
> devices by defining the generic compatible string "renesas,rcar-gen2-wdt".
> Also, this patch expands the list of SoC-specific compatible strings to
> include RZ/G and R-Car Gen2 devices.
> 
> Signed-off-by: Fabrizio Castro <fabrizio.castro-kTT6dE0pTRh9uiUsa/gSgQ@public.gmane.org>
> Signed-off-by: Ramesh Shanmugasundaram <ramesh.shanmugasundaram-kTT6dE0pTRj3fQ9qLvQP4Q@public.gmane.orgs.com>
> Reviewed-by: Geert Uytterhoeven <geert+renesas-gXvu3+zWzMSzQB+pC5nmwQ@public.gmane.org>

Reviewed-by: Wolfram Sang <wsa+renesas-jBu1N2QxHDJrcw3mvpCnnVaTQe2KTcn/@public.gmane.org>


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Re: [RFC v4 14/26] ARM: shmobile: defconfig: Enable RENESAS_WDT_GEN

[Wolfram Sang]

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On Wed, Jan 31, 2018 at 06:24:18PM +0000, Fabrizio Castro wrote:
> R-Car Gen2 and RZ/G1 platforms come with a watchdog IP, therefore enable
> its driver by default.
> 
> Signed-off-by: Fabrizio Castro <fabrizio.castro-kTT6dE0pTRh9uiUsa/gSgQ@public.gmane.org>
> Signed-off-by: Ramesh Shanmugasundaram <ramesh.shanmugasundaram-kTT6dE0pTRj3fQ9qLvQP4Q@public.gmane.orgs.com>

Given the rest of the series works (same for the later patches):

Reviewed-by: Wolfram Sang <wsa+renesas-jBu1N2QxHDJrcw3mvpCnnVaTQe2KTcn/@public.gmane.org>


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Re: [RFC v4 15/26] clk: renesas: r8a7743: Add rwdt clock

[Wolfram Sang]

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On Wed, Jan 31, 2018 at 06:24:19PM +0000, Fabrizio Castro wrote:
> Add "rwdt" clock to r8a7743_mod_clks. Also, since we may need to access
> the watchdog registers at any time, declare the clock as critical.
> 
> Signed-off-by: Fabrizio Castro <fabrizio.castro-kTT6dE0pTRh9uiUsa/gSgQ@public.gmane.org>
> Signed-off-by: Ramesh Shanmugasundaram <ramesh.shanmugasundaram-kTT6dE0pTRj3fQ9qLvQP4Q@public.gmane.orgs.com>

Reviewed-by: Wolfram Sang <wsa+renesas-jBu1N2QxHDJrcw3mvpCnnVaTQe2KTcn/@public.gmane.org>


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Re: [RFC v4 16/26] clk: renesas: r8a7745: Add rwdt clock

[Wolfram Sang]

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On Wed, Jan 31, 2018 at 06:24:20PM +0000, Fabrizio Castro wrote:
> Add "rwdt" clock to r8a7745_mod_clks. Also, since we may need to access
> the watchdog registers at any time, declare the clock as critical.
> 
> Signed-off-by: Fabrizio Castro <fabrizio.castro-kTT6dE0pTRh9uiUsa/gSgQ@public.gmane.org>
> Signed-off-by: Ramesh Shanmugasundaram <ramesh.shanmugasundaram-kTT6dE0pTRj3fQ9qLvQP4Q@public.gmane.orgs.com>

Reviewed-by: Wolfram Sang <wsa+renesas-jBu1N2QxHDJrcw3mvpCnnVaTQe2KTcn/@public.gmane.org>


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Re: [RFC v4 17/26] clk: renesas: r8a7790: Add rwdt clock

[Wolfram Sang]

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On Wed, Jan 31, 2018 at 06:24:21PM +0000, Fabrizio Castro wrote:
> Add "rwdt" clock to r8a7790_mod_clks. Also, since we may need to access
> the watchdog registers at any time, declare the clock as critical.
> 
> Signed-off-by: Fabrizio Castro <fabrizio.castro@bp.renesas.com>
> Signed-off-by: Ramesh Shanmugasundaram <ramesh.shanmugasundaram@bp.renesas.com>

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


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Re: [RFC v4 18/26] clk: renesas: r8a7791/r8a7793: Add rwdt clock

[Wolfram Sang]

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On Wed, Jan 31, 2018 at 06:24:22PM +0000, Fabrizio Castro wrote:
> Add "rwdt" clock to r8a7791_mod_clks. Also, since we may need to access
> the watchdog registers at any time, declare the clock as critical.
> 
> Signed-off-by: Fabrizio Castro <fabrizio.castro@bp.renesas.com>
> Signed-off-by: Ramesh Shanmugasundaram <ramesh.shanmugasundaram@bp.renesas.com>

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


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Re: [RFC v4 19/26] clk: renesas: r8a7794: Add rwdt clock

[Wolfram Sang]

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On Wed, Jan 31, 2018 at 06:24:23PM +0000, Fabrizio Castro wrote:
> Add "rwdt" clock to r8a7794_mod_clks. Also, since we may need to access
> the watchdog registers at any time, declare the clock as critical.
> 
> Signed-off-by: Fabrizio Castro <fabrizio.castro-kTT6dE0pTRh9uiUsa/gSgQ@public.gmane.org>
> Signed-off-by: Ramesh Shanmugasundaram <ramesh.shanmugasundaram-kTT6dE0pTRj3fQ9qLvQP4Q@public.gmane.orgs.com>

Reviewed-by: Wolfram Sang <wsa+renesas-jBu1N2QxHDJrcw3mvpCnnVaTQe2KTcn/@public.gmane.org>


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Re: [RFC v4 20/26] ARM: dts: r8a7743: Add watchdog support to SoC dtsi

[Wolfram Sang]

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On Wed, Jan 31, 2018 at 06:24:24PM +0000, Fabrizio Castro wrote:
> This patch adds watchdog support to the r8a7743 SoC dtsi.
> 
> Signed-off-by: Fabrizio Castro <fabrizio.castro-kTT6dE0pTRh9uiUsa/gSgQ@public.gmane.org>
> Signed-off-by: Ramesh Shanmugasundaram <ramesh.shanmugasundaram-kTT6dE0pTRj3fQ9qLvQP4Q@public.gmane.orgs.com>
> Reviewed-by: Geert Uytterhoeven <geert+renesas-gXvu3+zWzMSzQB+pC5nmwQ@public.gmane.org>

Acked-by: Wolfram Sang <wsa+renesas-jBu1N2QxHDJrcw3mvpCnnVaTQe2KTcn/@public.gmane.org>


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Re: [RFC v4 21/26] ARM: dts: r8a7745: Add watchdog support to SoC dtsi

[Wolfram Sang]

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On Wed, Jan 31, 2018 at 06:24:25PM +0000, Fabrizio Castro wrote:
> This patch adds watchdog support to the r8a7745 SoC dtsi.
> 
> Signed-off-by: Fabrizio Castro <fabrizio.castro-kTT6dE0pTRh9uiUsa/gSgQ@public.gmane.org>
> Signed-off-by: Ramesh Shanmugasundaram <ramesh.shanmugasundaram-kTT6dE0pTRj3fQ9qLvQP4Q@public.gmane.orgs.com>
> Reviewed-by: Geert Uytterhoeven <geert+renesas-gXvu3+zWzMSzQB+pC5nmwQ@public.gmane.org>

Acked-by: Wolfram Sang <wsa+renesas-jBu1N2QxHDJrcw3mvpCnnVaTQe2KTcn/@public.gmane.org>


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Re: [RFC v4 22/26] ARM: dts: r8a7790: Add watchdog support to SoC dtsi

[Wolfram Sang]

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On Wed, Jan 31, 2018 at 06:24:26PM +0000, Fabrizio Castro wrote:
> This commit adds watchdog support to the r8a7790 dtsi.
> 
> Signed-off-by: Fabrizio Castro <fabrizio.castro@bp.renesas.com>
> Signed-off-by: Ramesh Shanmugasundaram <ramesh.shanmugasundaram@bp.renesas.com>
> Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>

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


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Re: [RFC v4 23/26] ARM: dts: r8a7791: Add watchdog support to SoC dtsi

[Wolfram Sang]

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On Wed, Jan 31, 2018 at 06:24:27PM +0000, Fabrizio Castro wrote:
> This commit adds watchdog support to the r8a7791 dtsi.
> 
> Signed-off-by: Fabrizio Castro <fabrizio.castro@bp.renesas.com>
> Signed-off-by: Ramesh Shanmugasundaram <ramesh.shanmugasundaram@bp.renesas.com>
> Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>

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


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Re: [RFC v4 24/26] ARM: dts: r8a7794: Add watchdog support to SoC dtsi

[Wolfram Sang]

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On Wed, Jan 31, 2018 at 06:24:28PM +0000, Fabrizio Castro wrote:
> This commit adds watchdog support to the r8a7794 dtsi.
> 
> Signed-off-by: Fabrizio Castro <fabrizio.castro-kTT6dE0pTRh9uiUsa/gSgQ@public.gmane.org>
> Signed-off-by: Ramesh Shanmugasundaram <ramesh.shanmugasundaram-kTT6dE0pTRj3fQ9qLvQP4Q@public.gmane.orgs.com>
> Reviewed-by: Geert Uytterhoeven <geert+renesas-gXvu3+zWzMSzQB+pC5nmwQ@public.gmane.org>

Acked-by: Wolfram Sang <wsa+renesas-jBu1N2QxHDJrcw3mvpCnnVaTQe2KTcn/@public.gmane.org>


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Re: [RFC v4 25/26] ARM: dts: iwg20m: Add watchdog support to SoM dtsi

[Wolfram Sang]

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On Wed, Jan 31, 2018 at 06:24:29PM +0000, Fabrizio Castro wrote:
> This patch enables the watchdog from within the iwg20m SoM dtsi.
> 
> Signed-off-by: Fabrizio Castro <fabrizio.castro-kTT6dE0pTRh9uiUsa/gSgQ@public.gmane.org>
> Signed-off-by: Ramesh Shanmugasundaram <ramesh.shanmugasundaram-kTT6dE0pTRj3fQ9qLvQP4Q@public.gmane.orgs.com>
> Reviewed-by: Geert Uytterhoeven <geert+renesas-gXvu3+zWzMSzQB+pC5nmwQ@public.gmane.org>

Reviewed-by: Wolfram Sang <wsa+renesas-jBu1N2QxHDJrcw3mvpCnnVaTQe2KTcn/@public.gmane.org>


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Re: [RFC v4 26/26] ARM: dts: iwg22m: Add watchdog support to SoM dtsi

[Wolfram Sang]

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On Wed, Jan 31, 2018 at 06:24:30PM +0000, Fabrizio Castro wrote:
> This patch enables the watchdog from within the iwg20m SoM dtsi.
> 
> Signed-off-by: Fabrizio Castro <fabrizio.castro@bp.renesas.com>
> Signed-off-by: Ramesh Shanmugasundaram <ramesh.shanmugasundaram@bp.renesas.com>
> Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>

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


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RE: [RFC v4 12/26] watchdog: renesas_wdt: Add R-Car Gen2 support

[Fabrizio Castro]

Hello Wolfram,

thank you for your feedback!

> Subject: Re: [RFC v4 12/26] watchdog: renesas_wdt: Add R-Car Gen2 support
>
>
> > +#ifdef CONFIG_PM
> > +static int rwdt_suspend(struct device *dev)
> > +{
> > +struct platform_device *pdev;
> > +struct rwdt_priv *priv;
> > +
> > +pdev = to_platform_device(dev);
> > +priv = platform_get_drvdata(pdev);
>
> struct rwdt_priv *priv = dev_get_drvdata(dev);
>
> ?

will change

>
>
> > +if (watchdog_active(&priv->wdev)) {
> > +rwdt_write(priv, priv->cks, RWTCSRA);
> > +}
> > +return 0;
> > +}
> > +
> > +static int rwdt_resume(struct device *dev)
> > +{
> > +struct platform_device *pdev;
> > +struct rwdt_priv *priv;
> > +
> > +pdev = to_platform_device(dev);
> > +priv = platform_get_drvdata(pdev);
>
> ditto

will change

>
> > +if (watchdog_active(&priv->wdev)) {
> > +rwdt_write(priv, priv->cks | RWTCSRA_TME, RWTCSRA);
> > +}
> > +return 0;
> > +}
> > +
> > +static const struct dev_pm_ops rwdt_pm = {
> > +.suspend = rwdt_suspend,
> > +.resume = rwdt_resume,
> > +};
>
> Use SIMPLE_DEV_PM_OPS macro (see stmp3xxx_rtc_wdt.c for an example) for
> more compact code and...
>
> > +#ifdef CONFIG_PM
> > +.pm = &rwdt_pm,
> > +#endif
>
> ... removing this ifdeffery?

will take out the ifdeffery


Thanks,
Fabrizio



Renesas Electronics Europe Ltd, Dukes Meadow, Millboard Road, Bourne End, Buckinghamshire, SL8 5FH, UK. Registered in England & Wales under Registered No. 04586709.
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RE: [RFC v4 13/26] watchdog: renesas_wdt: Add restart handler

[Fabrizio Castro]

Hello Wolfram,

thank you for your feedback!

> Subject: Re: [RFC v4 13/26] watchdog: renesas_wdt: Add restart handler
>
>
> > +static int rwdt_restart(struct watchdog_device *wdev, unsigned long action,
> > +void *data)
> > +{
> > +struct rwdt_priv *priv = watchdog_get_drvdata(wdev);
> > +
> > +pm_runtime_get_sync(wdev->parent);
> > +
> > +rwdt_write(priv, 0x00, RWTCSRB);
> > +rwdt_write(priv, 0x00, RWTCSRA);
> > +rwdt_write(priv, 0xffff, RWTCNT);
> > +
> > +while (readb_relaxed(priv->base + RWTCSRA) & RWTCSRA_WRFLG)
> > +cpu_relax();
> > +
> > +rwdt_write(priv, 0x80, RWTCSRA);
> > +return 0;
> > +}
>
> I used to have this simpler version (back then for the UP case):
>
> +rwdt_start(wdev);
> +rwdt_write(priv, 0xffff, RWTCNT);
> +return 0;
>
> It should still work probably...

It should still work, but it would be slower, I would stick with the version I have submitted if you don't mind.

Thanks,
Fabrizio





Renesas Electronics Europe Ltd, Dukes Meadow, Millboard Road, Bourne End, Buckinghamshire, SL8 5FH, UK. Registered in England & Wales under Registered No. 04586709.

Re: [RFC v4 13/26] watchdog: renesas_wdt: Add restart handler

[Wolfram Sang]

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> > I used to have this simpler version (back then for the UP case):
> >
> > +rwdt_start(wdev);
> > +rwdt_write(priv, 0xffff, RWTCNT);
> > +return 0;
> >
> > It should still work probably...
> 
> It should still work, but it would be slower, I would stick with the
> version I have submitted if you don't mind.

Actually, I do mind. Because of code duplication reasons. We have a fix
in the works for rwdt_start() and it would be too easy to overlook the
same fix will be needed for a restart.


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RE: [RFC v4 13/26] watchdog: renesas_wdt: Add restart handler

[Fabrizio Castro]

> > > I used to have this simpler version (back then for the UP case):
> > >
> > > +rwdt_start(wdev);
> > > +rwdt_write(priv, 0xffff, RWTCNT);
> > > +return 0;
> > >
> > > It should still work probably...
> >
> > It should still work, but it would be slower, I would stick with the
> > version I have submitted if you don't mind.
>
> Actually, I do mind. Because of code duplication reasons. We have a fix
> in the works for rwdt_start() and it would be too easy to overlook the
> same fix will be needed for a restart.

The code is very similar indeed, but not exactly duplicated as it sets the registers in order to reset
the system as quickly as possible.
But since you have strong feelings about this I'll reuse this other version for the next submission.

Thanks,
Fabrizio




Renesas Electronics Europe Ltd, Dukes Meadow, Millboard Road, Bourne End, Buckinghamshire, SL8 5FH, UK. Registered in England & Wales under Registered No. 04586709.
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