[PATCH 0/3] arm: msm: Use timer DT node for qcom watchdog config

[PATCH 0/3] arm: msm: Use timer DT node for qcom watchdog config

[Mathieu Olivari]

This change is done as a follow-up to the following thread:
https://lkml.org/lkml/2014/10/1/436

qcom-wdt is currently assuming the presence of a dedicated node in DT
to gets its configuration. However, on msm architecture, the watchdog is
usually part of the timer block. So this patch-set is changing the driver
and slightly enhancing the timer DT bindings to provide the relevant clocks
and interrupts.

Mathieu Olivari (3):
  watchdog: qcom: use timer devicetree binding
  ARM: qcom: add description of KPSS WDT for IPQ8064
  ARM: msm: add watchdog entries to DT timer binding doc

 Documentation/devicetree/bindings/arm/msm/timer.txt | 16 +++++++++++++---
 arch/arm/boot/dts/qcom-ipq8064.dtsi                 | 14 +++++++++++++-
 drivers/watchdog/qcom-wdt.c                         | 21 +++++++++++++++------
 3 files changed, 41 insertions(+), 10 deletions(-)

-- 
1.9.1

[PATCH 1/3] watchdog: qcom: use timer devicetree binding

[Mathieu Olivari]

MSM watchdog configuration happens in the same register block as the
timer, so we'll use the same binding as the existing timer.

The qcom-wdt will now be probed when devicetree has an entry compatible
with "qcom,kpss-timer" or "qcom-scss-timer".

Signed-off-by: Mathieu Olivari <mathieu@codeaurora.org>
---
 drivers/watchdog/qcom-wdt.c | 21 +++++++++++++++------
 1 file changed, 15 insertions(+), 6 deletions(-)

diff --git a/drivers/watchdog/qcom-wdt.c b/drivers/watchdog/qcom-wdt.c
index aa85618..aa03ca8 100644
--- a/drivers/watchdog/qcom-wdt.c
+++ b/drivers/watchdog/qcom-wdt.c
@@ -20,9 +20,9 @@
 #include <linux/reboot.h>
 #include <linux/watchdog.h>
 
-#define WDT_RST		0x0
-#define WDT_EN		0x8
-#define WDT_BITE_TIME	0x24
+#define WDT_RST		0x38
+#define WDT_EN		0x40
+#define WDT_BITE_TIME	0x5C
 
 struct qcom_wdt {
 	struct watchdog_device	wdd;
@@ -117,6 +117,8 @@ static int qcom_wdt_probe(struct platform_device *pdev)
 {
 	struct qcom_wdt *wdt;
 	struct resource *res;
+	struct device_node *np = pdev->dev.of_node;
+	u32 percpu_offset;
 	int ret;
 
 	wdt = devm_kzalloc(&pdev->dev, sizeof(*wdt), GFP_KERNEL);
@@ -124,6 +126,14 @@ static int qcom_wdt_probe(struct platform_device *pdev)
 		return -ENOMEM;
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+
+	/* We use CPU0's DGT for the watchdog */
+	if (of_property_read_u32(np, "cpu-offset", &percpu_offset))
+		percpu_offset = 0;
+
+	res->start += percpu_offset;
+	res->end += percpu_offset;
+
 	wdt->base = devm_ioremap_resource(&pdev->dev, res);
 	if (IS_ERR(wdt->base))
 		return PTR_ERR(wdt->base);
@@ -203,9 +213,8 @@ static int qcom_wdt_remove(struct platform_device *pdev)
 }
 
 static const struct of_device_id qcom_wdt_of_table[] = {
-	{ .compatible = "qcom,kpss-wdt-msm8960", },
-	{ .compatible = "qcom,kpss-wdt-apq8064", },
-	{ .compatible = "qcom,kpss-wdt-ipq8064", },
+	{ .compatible = "qcom,kpss-timer" },
+	{ .compatible = "qcom,scss-timer" },
 	{ },
 };
 MODULE_DEVICE_TABLE(of, qcom_wdt_of_table);
-- 
1.9.1

Re: [PATCH 1/3] watchdog: qcom: use timer devicetree binding

[Stephen Boyd]

On 02/20/15 18:19, Mathieu Olivari wrote:
> MSM watchdog configuration happens in the same register block as the
> timer, so we'll use the same binding as the existing timer.
>
> The qcom-wdt will now be probed when devicetree has an entry compatible
> with "qcom,kpss-timer" or "qcom-scss-timer".
>
> Signed-off-by: Mathieu Olivari <mathieu-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
>

Reviewed-by: Stephen Boyd <sboyd-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>

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Re: [PATCH 1/3] watchdog: qcom: use timer devicetree binding

[Guenter Roeck]

On Fri, Feb 20, 2015 at 06:19:34PM -0800, Mathieu Olivari wrote:
> MSM watchdog configuration happens in the same register block as the
> timer, so we'll use the same binding as the existing timer.
> 
> The qcom-wdt will now be probed when devicetree has an entry compatible
> with "qcom,kpss-timer" or "qcom-scss-timer".
> 
> Signed-off-by: Mathieu Olivari <mathieu@codeaurora.org>

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

[PATCH 2/3] ARM: qcom: add description of KPSS WDT for IPQ8064

[Mathieu Olivari]

Add the watchdog related entries to the Krait Processor Sub-system
(KPSS) timer IPQ8064 devicetree section. Also, add a fixed-clock
description of SLEEP_CLK, which will do for now.

Signed-off-by: Josh Cartwright <joshc@codeaurora.org>
Signed-off-by: Mathieu Olivari <mathieu@codeaurora.org>
---
 arch/arm/boot/dts/qcom-ipq8064.dtsi | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/arch/arm/boot/dts/qcom-ipq8064.dtsi b/arch/arm/boot/dts/qcom-ipq8064.dtsi
index cb225da..d01f618 100644
--- a/arch/arm/boot/dts/qcom-ipq8064.dtsi
+++ b/arch/arm/boot/dts/qcom-ipq8064.dtsi
@@ -60,6 +60,14 @@
 		};
 	};
 
+	clocks {
+		sleep_clk: sleep_clk {
+			compatible = "fixed-clock";
+			clock-frequency = <32768>;
+			#clock-cells = <0>;
+		};
+	};
+
 	soc: soc {
 		#address-cells = <1>;
 		#size-cells = <1>;
@@ -89,10 +97,14 @@
 			compatible = "qcom,kpss-timer", "qcom,msm-timer";
 			interrupts = <1 1 0x301>,
 				     <1 2 0x301>,
-				     <1 3 0x301>;
+				     <1 3 0x301>,
+				     <1 4 0x301>,
+				     <1 5 0x301>;
 			reg = <0x0200a000 0x100>;
 			clock-frequency = <25000000>,
 					  <32768>;
+			clocks = <&sleep_clk>;
+			clock-names = "sleep";
 			cpu-offset = <0x80000>;
 		};
 
-- 
1.9.1

Re: [PATCH 2/3] ARM: qcom: add description of KPSS WDT for IPQ8064

[Stephen Boyd]

On 02/20/15 18:19, Mathieu Olivari wrote:
> Add the watchdog related entries to the Krait Processor Sub-system
> (KPSS) timer IPQ8064 devicetree section. Also, add a fixed-clock
> description of SLEEP_CLK, which will do for now.
>
> Signed-off-by: Josh Cartwright <joshc@codeaurora.org>
> Signed-off-by: Mathieu Olivari <mathieu@codeaurora.org>
>

Reviewed-by: Stephen Boyd <sboyd@codeaurora.org>

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a Linux Foundation Collaborative Project

Re: [PATCH 2/3] ARM: qcom: add description of KPSS WDT for IPQ8064

[Guenter Roeck]

On Fri, Feb 20, 2015 at 06:19:35PM -0800, Mathieu Olivari wrote:
> Add the watchdog related entries to the Krait Processor Sub-system
> (KPSS) timer IPQ8064 devicetree section. Also, add a fixed-clock
> description of SLEEP_CLK, which will do for now.
> 
> Signed-off-by: Josh Cartwright <joshc@codeaurora.org>
> Signed-off-by: Mathieu Olivari <mathieu@codeaurora.org>

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

[PATCH 3/3] ARM: msm: add watchdog entries to DT timer binding doc

[Mathieu Olivari]

The watchdog has been reworked to use the same DT node as the timer.
This change is updating the device tree doc accordingly.

Signed-off-by: Mathieu Olivari <mathieu-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
---
 Documentation/devicetree/bindings/arm/msm/timer.txt | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/Documentation/devicetree/bindings/arm/msm/timer.txt b/Documentation/devicetree/bindings/arm/msm/timer.txt
index 74607b6..5e10c34 100644
--- a/Documentation/devicetree/bindings/arm/msm/timer.txt
+++ b/Documentation/devicetree/bindings/arm/msm/timer.txt
@@ -9,11 +9,17 @@ Properties:
                "qcom,scss-timer" - scorpion subsystem
 
 - interrupts : Interrupts for the debug timer, the first general purpose
-               timer, and optionally a second general purpose timer in that
-               order.
+               timer, and optionally a second general purpose timer, and
+               optionally as well, 2 watchdog interrupts, in that order.
 
 - reg : Specifies the base address of the timer registers.
 
+- clocks: Reference to the parent clocks, one per output clock. The parents
+          must appear in the same order as the clock names.
+
+- clock-names: The name of the clocks as free-form strings. They should be in
+               the same order as the clocks.
+
 - clock-frequency : The frequency of the debug timer and the general purpose
                     timer(s) in Hz in that order.
 
@@ -29,9 +35,13 @@ Example:
                compatible = "qcom,scss-timer", "qcom,msm-timer";
                interrupts = <1 1 0x301>,
                             <1 2 0x301>,
-                            <1 3 0x301>;
+                            <1 3 0x301>,
+                            <1 4 0x301>,
+                            <1 5 0x301>;
                reg = <0x0200a000 0x100>;
                clock-frequency = <19200000>,
                                  <32768>;
+               clocks = <&sleep_clk>;
+               clock-names = "sleep";
                cpu-offset = <0x40000>;
        };
-- 
1.9.1

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Re: [PATCH 3/3] ARM: msm: add watchdog entries to DT timer binding doc

[Guenter Roeck]

On Fri, Feb 20, 2015 at 06:19:36PM -0800, Mathieu Olivari wrote:
> The watchdog has been reworked to use the same DT node as the timer.
> This change is updating the device tree doc accordingly.
> 
> Signed-off-by: Mathieu Olivari <mathieu-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>

Acked-by: Guenter Roeck <linux-0h96xk9xTtrk1uMJSBkQmQ@public.gmane.org>
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Re: [PATCH 0/3] arm: msm: Use timer DT node for qcom watchdog config

[Arnd Bergmann]

On Friday 20 February 2015 18:19:33 Mathieu Olivari wrote:
> This change is done as a follow-up to the following thread:
> https://lkml.org/lkml/2014/10/1/436
> 
> qcom-wdt is currently assuming the presence of a dedicated node in DT
> to gets its configuration. However, on msm architecture, the watchdog is
> usually part of the timer block. So this patch-set is changing the driver
> and slightly enhancing the timer DT bindings to provide the relevant clocks
> and interrupts.
> 
> Mathieu Olivari (3):
>   watchdog: qcom: use timer devicetree binding
>   ARM: qcom: add description of KPSS WDT for IPQ8064
>   ARM: msm: add watchdog entries to DT timer binding doc
> 
>  Documentation/devicetree/bindings/arm/msm/timer.txt | 16 +++++++++++++---
>  arch/arm/boot/dts/qcom-ipq8064.dtsi                 | 14 +++++++++++++-
>  drivers/watchdog/qcom-wdt.c                         | 21 +++++++++++++++------
>  3 files changed, 41 insertions(+), 10 deletions(-)
> 
> 

What about the binding document in
Documentation/devicetree/bindings/watchdog/qcom-wdt.txt?

	Arnd
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Re: [PATCH 0/3] arm: msm: Use timer DT node for qcom watchdog config

[Stephen Boyd]

On 02/23/15 13:35, Arnd Bergmann wrote:
> On Friday 20 February 2015 18:19:33 Mathieu Olivari wrote:
>> This change is done as a follow-up to the following thread:
>> https://lkml.org/lkml/2014/10/1/436
>>
>> qcom-wdt is currently assuming the presence of a dedicated node in DT
>> to gets its configuration. However, on msm architecture, the watchdog is
>> usually part of the timer block. So this patch-set is changing the driver
>> and slightly enhancing the timer DT bindings to provide the relevant clocks
>> and interrupts.
>>
>> Mathieu Olivari (3):
>>   watchdog: qcom: use timer devicetree binding
>>   ARM: qcom: add description of KPSS WDT for IPQ8064
>>   ARM: msm: add watchdog entries to DT timer binding doc
>>
>>  Documentation/devicetree/bindings/arm/msm/timer.txt | 16 +++++++++++++---
>>  arch/arm/boot/dts/qcom-ipq8064.dtsi                 | 14 +++++++++++++-
>>  drivers/watchdog/qcom-wdt.c                         | 21 +++++++++++++++------
>>  3 files changed, 41 insertions(+), 10 deletions(-)
>>
>>
> What about the binding document in
> Documentation/devicetree/bindings/watchdog/qcom-wdt.txt?
>
>

We can rewrite it for platforms starting with msm8974 and beyond or
delete it and write a new binding. It's a similar hardware block split
out from the timers and then made to use a SPI instead of a PPI for the
interrupt sources. We also lost the CPU remapping feature so there is
really only one watchdog instead of 2 per cpu. Oh and the register
offsets are different, but otherwise the registers are the same.

---8<-----

From: Stephen Boyd <sboyd-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
Subject: [PATCH] Documentation: qcom-wdt: Update binding for individual block

On msm8974 and beyond the KPSS watchdog is split out of the timer
block and made to be a single instance instead of per-cpu. Let's
update the binding to reflect this and replace the binding that
is handled by the qcom,kpss-timer binding.

Signed-off-by: Stephen Boyd <sboyd-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
---
 Documentation/devicetree/bindings/watchdog/qcom-wdt.txt | 13 +++++--------
 1 file changed, 5 insertions(+), 8 deletions(-)

diff --git a/Documentation/devicetree/bindings/watchdog/qcom-wdt.txt b/Documentation/devicetree/bindings/watchdog/qcom-wdt.txt
index 4726924d034e..78b92bec4c3a 100644
--- a/Documentation/devicetree/bindings/watchdog/qcom-wdt.txt
+++ b/Documentation/devicetree/bindings/watchdog/qcom-wdt.txt
@@ -2,14 +2,10 @@ Qualcomm Krait Processor Sub-system (KPSS) Watchdog
 ---------------------------------------------------
 
 Required properties :
-- compatible : shall contain only one of the following:
-
-			"qcom,kpss-wdt-msm8960"
-			"qcom,kpss-wdt-apq8064"
-			"qcom,kpss-wdt-ipq8064"
-
+- compatible : shall contain "qcom,kpss-wdt"
 - reg : shall contain base register location and length
 - clocks : shall contain the input clock
+- interrupts : shall contain the bark and bite interrupts in that order
 
 Optional properties :
 - timeout-sec : shall contain the default watchdog timeout in seconds,
@@ -17,8 +13,9 @@ Optional properties :
 
 Example:
 	watchdog@208a038 {
-		compatible = "qcom,kpss-wdt-ipq8064";
-		reg = <0x0208a038 0x40>;
+		compatible = "qcom,kpss-wdt";
+		reg = <0xf9017000 0x1000>;
+		interrupts = <0 3 0>, <0 4 0>;
 		clocks = <&sleep_clk>;
 		timeout-sec = <10>;
 	};

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Re: [PATCH 0/3] arm: msm: Use timer DT node for qcom watchdog config

[Stephen Boyd]

On 02/20, Mathieu Olivari wrote:
> This change is done as a follow-up to the following thread:
> https://lkml.org/lkml/2014/10/1/436
> 
> qcom-wdt is currently assuming the presence of a dedicated node in DT
> to gets its configuration. However, on msm architecture, the watchdog is
> usually part of the timer block. So this patch-set is changing the driver
> and slightly enhancing the timer DT bindings to provide the relevant clocks
> and interrupts.
> 
> Mathieu Olivari (3):
>   watchdog: qcom: use timer devicetree binding
>   ARM: qcom: add description of KPSS WDT for IPQ8064
>   ARM: msm: add watchdog entries to DT timer binding doc
> 
>  Documentation/devicetree/bindings/arm/msm/timer.txt | 16 +++++++++++++---
>  arch/arm/boot/dts/qcom-ipq8064.dtsi                 | 14 +++++++++++++-
>  drivers/watchdog/qcom-wdt.c                         | 21 +++++++++++++++------
>  3 files changed, 41 insertions(+), 10 deletions(-)
> 

Can this patchset be applied? Or should we resend with collected
acks?

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Re: [PATCH 0/3] arm: msm: Use timer DT node for qcom watchdog config

[Wim Van Sebroeck]

Hi Mathieu,

> This change is done as a follow-up to the following thread:
> https://lkml.org/lkml/2014/10/1/436
> 
> qcom-wdt is currently assuming the presence of a dedicated node in DT
> to gets its configuration. However, on msm architecture, the watchdog is
> usually part of the timer block. So this patch-set is changing the driver
> and slightly enhancing the timer DT bindings to provide the relevant clocks
> and interrupts.
> 
> Mathieu Olivari (3):
>   watchdog: qcom: use timer devicetree binding
>   ARM: qcom: add description of KPSS WDT for IPQ8064
>   ARM: msm: add watchdog entries to DT timer binding doc
> 
>  Documentation/devicetree/bindings/arm/msm/timer.txt | 16 +++++++++++++---
>  arch/arm/boot/dts/qcom-ipq8064.dtsi                 | 14 +++++++++++++-
>  drivers/watchdog/qcom-wdt.c                         | 21 +++++++++++++++------
>  3 files changed, 41 insertions(+), 10 deletions(-)

This patchset has been added to linux-watchdog-next.

Kind regards,
Wim.

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