[2/3] dt-bindings: amlogic: Add Internal Clock Measurer bindings

Message ID 1530624110-4687-3-git-send-email-narmstrong@baylibre.com
State Changes Requested
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Series
  • Untitled series #53475
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Commit Message

Neil Armstrong July 3, 2018, 1:21 p.m.
The Amlogic Meson GX SoCs embeds a clock measurer IP to measure the internal
clock paths frequencies.

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
---
 .../devicetree/bindings/soc/amlogic/clk-measure.txt       | 15 +++++++++++++++
 1 file changed, 15 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/soc/amlogic/clk-measure.txt

Comments

Rob Herring July 16, 2018, 9:45 p.m. | #1
On Tue, Jul 03, 2018 at 03:21:49PM +0200, Neil Armstrong wrote:
> The Amlogic Meson GX SoCs embeds a clock measurer IP to measure the internal
> clock paths frequencies.
> 
> Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
> ---
>  .../devicetree/bindings/soc/amlogic/clk-measure.txt       | 15 +++++++++++++++
>  1 file changed, 15 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/soc/amlogic/clk-measure.txt
> 
> diff --git a/Documentation/devicetree/bindings/soc/amlogic/clk-measure.txt b/Documentation/devicetree/bindings/soc/amlogic/clk-measure.txt
> new file mode 100644
> index 0000000..ba9183a
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/soc/amlogic/clk-measure.txt
> @@ -0,0 +1,15 @@
> +Amlogic Internal Clock Measurer
> +===============================
> +
> +The Amlogic SoCs contains an IP to measure the internal clocks.
> +The precision is multiple of MHz, useful to debug the clock states.

What a simple yet useful debug tool.

> +
> +Required properties:
> +- compatible: Shall contain "amlogic,meson-gx-clk-measure"
> +- reg: base address and size of the Clock Measurer register space.
> +
> +Example:
> +	clock-measure@8758 {
> +		compatible = "amlogic,meson-gx-clk-measure";
> +		reg = <0x0 0x8758 0x0 0x10>;

This doesn't really look like its own block though. Can't the parent 
device instantiate the driver for this?


> +	};
> -- 
> 2.7.4
> 
> 
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
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Neil Armstrong July 17, 2018, 11:30 a.m. | #2
Hi Rob,

On 16/07/2018 23:45, Rob Herring wrote:
> On Tue, Jul 03, 2018 at 03:21:49PM +0200, Neil Armstrong wrote:
>> The Amlogic Meson GX SoCs embeds a clock measurer IP to measure the internal
>> clock paths frequencies.
>>
>> Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
>> ---
>>  .../devicetree/bindings/soc/amlogic/clk-measure.txt       | 15 +++++++++++++++
>>  1 file changed, 15 insertions(+)
>>  create mode 100644 Documentation/devicetree/bindings/soc/amlogic/clk-measure.txt
>>
>> diff --git a/Documentation/devicetree/bindings/soc/amlogic/clk-measure.txt b/Documentation/devicetree/bindings/soc/amlogic/clk-measure.txt
>> new file mode 100644
>> index 0000000..ba9183a
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/soc/amlogic/clk-measure.txt
>> @@ -0,0 +1,15 @@
>> +Amlogic Internal Clock Measurer
>> +===============================
>> +
>> +The Amlogic SoCs contains an IP to measure the internal clocks.
>> +The precision is multiple of MHz, useful to debug the clock states.
> 
> What a simple yet useful debug tool.
> 
>> +
>> +Required properties:
>> +- compatible: Shall contain "amlogic,meson-gx-clk-measure"
>> +- reg: base address and size of the Clock Measurer register space.
>> +
>> +Example:
>> +	clock-measure@8758 {
>> +		compatible = "amlogic,meson-gx-clk-measure";
>> +		reg = <0x0 0x8758 0x0 0x10>;
> 
> This doesn't really look like its own block though. Can't the parent 
> device instantiate the driver for this?

As weird as it seems, on the GX family the registers are not on a aligned boundary, but yes it's its own block.
On newer SoCs, they have a more aligned register address, with the exact same register set.

Neil

> 
> 
>> +	};
>> -- 
>> 2.7.4
>>
>>
>> _______________________________________________
>> linux-arm-kernel mailing list
>> linux-arm-kernel@lists.infradead.org
>> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

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Patch

diff --git a/Documentation/devicetree/bindings/soc/amlogic/clk-measure.txt b/Documentation/devicetree/bindings/soc/amlogic/clk-measure.txt
new file mode 100644
index 0000000..ba9183a
--- /dev/null
+++ b/Documentation/devicetree/bindings/soc/amlogic/clk-measure.txt
@@ -0,0 +1,15 @@ 
+Amlogic Internal Clock Measurer
+===============================
+
+The Amlogic SoCs contains an IP to measure the internal clocks.
+The precision is multiple of MHz, useful to debug the clock states.
+
+Required properties:
+- compatible: Shall contain "amlogic,meson-gx-clk-measure"
+- reg: base address and size of the Clock Measurer register space.
+
+Example:
+	clock-measure@8758 {
+		compatible = "amlogic,meson-gx-clk-measure";
+		reg = <0x0 0x8758 0x0 0x10>;
+	};