diff mbox series

[v2,1/6] dt-bindings: reserved-memory: Add Owl SoC serial number binding

Message ID fb74862bec15f1e9e0c4d8b70ebd6c07c6eb1a40.1617110420.git.cristian.ciocaltea@gmail.com (mailing list archive)
State New, archived
Headers show
Series Add support for Actions Semi Owl socinfo | expand

Commit Message

Cristian Ciocaltea March 30, 2021, 1:48 p.m. UTC 
Add devicetree binding for the Actions Semi Owl SoC serial number
reserved-memory range.

Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@gmail.com>
---
 .../actions,owl-soc-serial.yaml               | 53 +++++++++++++++++++
 1 file changed, 53 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/reserved-memory/actions,owl-soc-serial.yaml

Comments

Rob Herring (Arm) April 1, 2021, 5:07 p.m. UTC | #1 
On Tue, Mar 30, 2021 at 04:48:16PM +0300, Cristian Ciocaltea wrote:
> Add devicetree binding for the Actions Semi Owl SoC serial number
> reserved-memory range.
> 
> Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@gmail.com>
> ---
>  .../actions,owl-soc-serial.yaml               | 53 +++++++++++++++++++
>  1 file changed, 53 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/reserved-memory/actions,owl-soc-serial.yaml
> 
> diff --git a/Documentation/devicetree/bindings/reserved-memory/actions,owl-soc-serial.yaml b/Documentation/devicetree/bindings/reserved-memory/actions,owl-soc-serial.yaml
> new file mode 100644
> index 000000000000..41b71f47ee6c
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/reserved-memory/actions,owl-soc-serial.yaml
> @@ -0,0 +1,53 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/reserved-memory/actions,owl-soc-serial.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Actions Semi Owl reserved-memory for SoC serial number
> +
> +maintainers:
> +  - Cristian Ciocaltea <cristian.ciocaltea@gmail.com>
> +
> +description: |
> +  Provide access to the memory region where the two parts of the Actions
> +  Semi Owl SoC serial number (low & high) can be read from. This information
> +  is provided by the bootloader, hence expose it under /reserved-memory node.
> +
> +  Please refer to reserved-memory.txt in this directory for common binding
> +  part and usage.
> +
> +  This is currently supported only on the S500 SoC variant.
> +
> +properties:
> +  compatible:
> +    oneOf:
> +      - const: actions,owl-soc-serial
> +      - items:
> +          - enum:
> +              - actions,s500-soc-serial
> +          - const: actions,owl-soc-serial
> +
> +  reg:
> +    maxItems: 1
> +
> +required:
> +  - compatible
> +  - reg
> +
> +additionalProperties: true
> +
> +examples:
> +  - |
> +    reserved-memory {
> +        #address-cells = <1>;
> +        #size-cells = <1>;
> +        ranges;
> +
> +        soc_serial: soc-serial@800 {
> +            compatible = "actions,s500-soc-serial", "actions,owl-soc-serial";
> +            reg = <0x800 0x8>;

You end up wasting a whole page of memory for 8 bytes. It may be better 
to copy this to a DT property ('serial-number' is already a defined root 
property).

Rob
Cristian Ciocaltea April 1, 2021, 5:40 p.m. UTC | #2 
On Thu, Apr 01, 2021 at 12:07:04PM -0500, Rob Herring wrote:
> On Tue, Mar 30, 2021 at 04:48:16PM +0300, Cristian Ciocaltea wrote:
> > Add devicetree binding for the Actions Semi Owl SoC serial number
> > reserved-memory range.
> > 
> > Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@gmail.com>
> > ---
> >  .../actions,owl-soc-serial.yaml               | 53 +++++++++++++++++++
> >  1 file changed, 53 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/reserved-memory/actions,owl-soc-serial.yaml
> > 
> > diff --git a/Documentation/devicetree/bindings/reserved-memory/actions,owl-soc-serial.yaml b/Documentation/devicetree/bindings/reserved-memory/actions,owl-soc-serial.yaml
> > new file mode 100644
> > index 000000000000..41b71f47ee6c
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/reserved-memory/actions,owl-soc-serial.yaml
> > @@ -0,0 +1,53 @@
> > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/reserved-memory/actions,owl-soc-serial.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: Actions Semi Owl reserved-memory for SoC serial number
> > +
> > +maintainers:
> > +  - Cristian Ciocaltea <cristian.ciocaltea@gmail.com>
> > +
> > +description: |
> > +  Provide access to the memory region where the two parts of the Actions
> > +  Semi Owl SoC serial number (low & high) can be read from. This information
> > +  is provided by the bootloader, hence expose it under /reserved-memory node.
> > +
> > +  Please refer to reserved-memory.txt in this directory for common binding
> > +  part and usage.
> > +
> > +  This is currently supported only on the S500 SoC variant.
> > +
> > +properties:
> > +  compatible:
> > +    oneOf:
> > +      - const: actions,owl-soc-serial
> > +      - items:
> > +          - enum:
> > +              - actions,s500-soc-serial
> > +          - const: actions,owl-soc-serial
> > +
> > +  reg:
> > +    maxItems: 1
> > +
> > +required:
> > +  - compatible
> > +  - reg
> > +
> > +additionalProperties: true
> > +
> > +examples:
> > +  - |
> > +    reserved-memory {
> > +        #address-cells = <1>;
> > +        #size-cells = <1>;
> > +        ranges;
> > +
> > +        soc_serial: soc-serial@800 {
> > +            compatible = "actions,s500-soc-serial", "actions,owl-soc-serial";
> > +            reg = <0x800 0x8>;
> 
> You end up wasting a whole page of memory for 8 bytes. It may be better 
> to copy this to a DT property ('serial-number' is already a defined root 
> property).

Actually there is more information provided by the vendor bootloader
in this memory page, so we might use it once we are able to decode it.
For the moment I could only identify the serial number.

Thanks,
Cristi

> Rob
Manivannan Sadhasivam April 2, 2021, 6:06 p.m. UTC | #3 
On Thu, Apr 01, 2021 at 08:40:01PM +0300, Cristian Ciocaltea wrote:
> On Thu, Apr 01, 2021 at 12:07:04PM -0500, Rob Herring wrote:
> > On Tue, Mar 30, 2021 at 04:48:16PM +0300, Cristian Ciocaltea wrote:
> > > Add devicetree binding for the Actions Semi Owl SoC serial number
> > > reserved-memory range.
> > > 
> > > Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@gmail.com>
> > > ---
> > >  .../actions,owl-soc-serial.yaml               | 53 +++++++++++++++++++
> > >  1 file changed, 53 insertions(+)
> > >  create mode 100644 Documentation/devicetree/bindings/reserved-memory/actions,owl-soc-serial.yaml
> > > 
> > > diff --git a/Documentation/devicetree/bindings/reserved-memory/actions,owl-soc-serial.yaml b/Documentation/devicetree/bindings/reserved-memory/actions,owl-soc-serial.yaml
> > > new file mode 100644
> > > index 000000000000..41b71f47ee6c
> > > --- /dev/null
> > > +++ b/Documentation/devicetree/bindings/reserved-memory/actions,owl-soc-serial.yaml
> > > @@ -0,0 +1,53 @@
> > > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > > +%YAML 1.2
> > > +---
> > > +$id: http://devicetree.org/schemas/reserved-memory/actions,owl-soc-serial.yaml#
> > > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > > +
> > > +title: Actions Semi Owl reserved-memory for SoC serial number
> > > +
> > > +maintainers:
> > > +  - Cristian Ciocaltea <cristian.ciocaltea@gmail.com>
> > > +
> > > +description: |
> > > +  Provide access to the memory region where the two parts of the Actions
> > > +  Semi Owl SoC serial number (low & high) can be read from. This information
> > > +  is provided by the bootloader, hence expose it under /reserved-memory node.
> > > +
> > > +  Please refer to reserved-memory.txt in this directory for common binding
> > > +  part and usage.
> > > +
> > > +  This is currently supported only on the S500 SoC variant.
> > > +
> > > +properties:
> > > +  compatible:
> > > +    oneOf:
> > > +      - const: actions,owl-soc-serial
> > > +      - items:
> > > +          - enum:
> > > +              - actions,s500-soc-serial
> > > +          - const: actions,owl-soc-serial
> > > +
> > > +  reg:
> > > +    maxItems: 1
> > > +
> > > +required:
> > > +  - compatible
> > > +  - reg
> > > +
> > > +additionalProperties: true
> > > +
> > > +examples:
> > > +  - |
> > > +    reserved-memory {
> > > +        #address-cells = <1>;
> > > +        #size-cells = <1>;
> > > +        ranges;
> > > +
> > > +        soc_serial: soc-serial@800 {
> > > +            compatible = "actions,s500-soc-serial", "actions,owl-soc-serial";
> > > +            reg = <0x800 0x8>;
> > 
> > You end up wasting a whole page of memory for 8 bytes. It may be better 
> > to copy this to a DT property ('serial-number' is already a defined root 
> > property).
> 
> Actually there is more information provided by the vendor bootloader

Then you should call it as socinfo or something not soc_serial.

Thanks,
Mani

> in this memory page, so we might use it once we are able to decode it.
> For the moment I could only identify the serial number.
> 
> Thanks,
> Cristi
> 
> > Rob
Cristian Ciocaltea April 2, 2021, 7:44 p.m. UTC | #4 
On Fri, Apr 02, 2021 at 11:36:07PM +0530, Manivannan Sadhasivam wrote:
> On Thu, Apr 01, 2021 at 08:40:01PM +0300, Cristian Ciocaltea wrote:
> > On Thu, Apr 01, 2021 at 12:07:04PM -0500, Rob Herring wrote:
> > > On Tue, Mar 30, 2021 at 04:48:16PM +0300, Cristian Ciocaltea wrote:
> > > > Add devicetree binding for the Actions Semi Owl SoC serial number
> > > > reserved-memory range.
> > > > 
> > > > Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@gmail.com>
> > > > ---
> > > >  .../actions,owl-soc-serial.yaml               | 53 +++++++++++++++++++
> > > >  1 file changed, 53 insertions(+)
> > > >  create mode 100644 Documentation/devicetree/bindings/reserved-memory/actions,owl-soc-serial.yaml
> > > > 
> > > > diff --git a/Documentation/devicetree/bindings/reserved-memory/actions,owl-soc-serial.yaml b/Documentation/devicetree/bindings/reserved-memory/actions,owl-soc-serial.yaml
> > > > new file mode 100644
> > > > index 000000000000..41b71f47ee6c
> > > > --- /dev/null
> > > > +++ b/Documentation/devicetree/bindings/reserved-memory/actions,owl-soc-serial.yaml
> > > > @@ -0,0 +1,53 @@
> > > > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > > > +%YAML 1.2
> > > > +---
> > > > +$id: http://devicetree.org/schemas/reserved-memory/actions,owl-soc-serial.yaml#
> > > > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > > > +
> > > > +title: Actions Semi Owl reserved-memory for SoC serial number
> > > > +
> > > > +maintainers:
> > > > +  - Cristian Ciocaltea <cristian.ciocaltea@gmail.com>
> > > > +
> > > > +description: |
> > > > +  Provide access to the memory region where the two parts of the Actions
> > > > +  Semi Owl SoC serial number (low & high) can be read from. This information
> > > > +  is provided by the bootloader, hence expose it under /reserved-memory node.
> > > > +
> > > > +  Please refer to reserved-memory.txt in this directory for common binding
> > > > +  part and usage.
> > > > +
> > > > +  This is currently supported only on the S500 SoC variant.
> > > > +
> > > > +properties:
> > > > +  compatible:
> > > > +    oneOf:
> > > > +      - const: actions,owl-soc-serial
> > > > +      - items:
> > > > +          - enum:
> > > > +              - actions,s500-soc-serial
> > > > +          - const: actions,owl-soc-serial
> > > > +
> > > > +  reg:
> > > > +    maxItems: 1
> > > > +
> > > > +required:
> > > > +  - compatible
> > > > +  - reg
> > > > +
> > > > +additionalProperties: true
> > > > +
> > > > +examples:
> > > > +  - |
> > > > +    reserved-memory {
> > > > +        #address-cells = <1>;
> > > > +        #size-cells = <1>;
> > > > +        ranges;
> > > > +
> > > > +        soc_serial: soc-serial@800 {
> > > > +            compatible = "actions,s500-soc-serial", "actions,owl-soc-serial";
> > > > +            reg = <0x800 0x8>;
> > > 
> > > You end up wasting a whole page of memory for 8 bytes. It may be better 
> > > to copy this to a DT property ('serial-number' is already a defined root 
> > > property).
> > 
> > Actually there is more information provided by the vendor bootloader
> 
> Then you should call it as socinfo or something not soc_serial.

Agree, maybe 'bootinfo' or 'fwinfo', to suggest it is coming from
firmware / bootloader.

Thanks for reviewing,
Cristi

> Thanks,
> Mani
> 
> > in this memory page, so we might use it once we are able to decode it.
> > For the moment I could only identify the serial number.
> > 
> > Thanks,
> > Cristi
> > 
> > > Rob
diff mbox series

Patch

diff --git a/Documentation/devicetree/bindings/reserved-memory/actions,owl-soc-serial.yaml b/Documentation/devicetree/bindings/reserved-memory/actions,owl-soc-serial.yaml
new file mode 100644
index 000000000000..41b71f47ee6c
--- /dev/null
+++ b/Documentation/devicetree/bindings/reserved-memory/actions,owl-soc-serial.yaml
@@ -0,0 +1,53 @@ 
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/reserved-memory/actions,owl-soc-serial.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Actions Semi Owl reserved-memory for SoC serial number
+
+maintainers:
+  - Cristian Ciocaltea <cristian.ciocaltea@gmail.com>
+
+description: |
+  Provide access to the memory region where the two parts of the Actions
+  Semi Owl SoC serial number (low & high) can be read from. This information
+  is provided by the bootloader, hence expose it under /reserved-memory node.
+
+  Please refer to reserved-memory.txt in this directory for common binding
+  part and usage.
+
+  This is currently supported only on the S500 SoC variant.
+
+properties:
+  compatible:
+    oneOf:
+      - const: actions,owl-soc-serial
+      - items:
+          - enum:
+              - actions,s500-soc-serial
+          - const: actions,owl-soc-serial
+
+  reg:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: true
+
+examples:
+  - |
+    reserved-memory {
+        #address-cells = <1>;
+        #size-cells = <1>;
+        ranges;
+
+        soc_serial: soc-serial@800 {
+            compatible = "actions,s500-soc-serial", "actions,owl-soc-serial";
+            reg = <0x800 0x8>;
+        };
+    };
+
+...