lkml.org 
[lkml]   [2021]   [Apr]   [1]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH v2 1/6] dt-bindings: reserved-memory: Add Owl SoC serial number binding
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

\
 
 \ /
  Last update: 2021-04-01 21:10    [W:0.101 / U:0.596 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site