[PATCH v4 6/8] dt-bindings: Add support for Amlogic GXBB SCPI Interface
sudeep.holla at arm.com
Wed Nov 2 15:20:50 PDT 2016
On Sat, Oct 29, 2016 at 11:39:05AM -0700, Olof Johansson wrote:
> On Wed, Oct 5, 2016 at 12:33 AM, Neil Armstrong <narmstrong at baylibre.com> wrote:
> > Acked-by: Rob Herring <robh at kernel.org>
> > Signed-off-by: Neil Armstrong <narmstrong at baylibre.com>
> > ---
> > Documentation/devicetree/bindings/arm/arm,scpi.txt | 8 +++++---
> > 1 file changed, 5 insertions(+), 3 deletions(-)
> > diff --git a/Documentation/devicetree/bindings/arm/arm,scpi.txt b/Documentation/devicetree/bindings/arm/arm,scpi.txt
> > index faa4b44..04bc171 100644
> > --- a/Documentation/devicetree/bindings/arm/arm,scpi.txt
> > +++ b/Documentation/devicetree/bindings/arm/arm,scpi.txt
> > @@ -7,7 +7,7 @@ by Linux to initiate various system control and power operations.
> > Required properties:
> > -- compatible : should be "arm,scpi"
> > +- compatible : should be "arm,scpi" or "amlogic,meson-gxbb-scpi"
> This doesn't seem right to document here. If anything you might want
> to have a table of more-specific-compatibles for specific
> implementations, but "arm,scpi" should still be the compatible of the
> node (just not the most specific one).
I completely agree with you and I was pushing for a generic "arm,legacy-scpi"
compatible until this binding was acked by Rob.
Anyways, I will add the generic compatible and post the changes.
> Also, documenting it here indiciates that non-amlogic implementations
> can/should use that compatible, which is misleading.
Agreed, it's better to keep them out of this generic binding document.
> > - mboxes: List of phandle and mailbox channel specifiers
> > All the channels reserved by remote SCP firmware for use by
> > SCPI message protocol should be specified in any order
> > @@ -60,7 +60,8 @@ A small area of SRAM is reserved for SCPI communication between application
> > processors and SCP.
> > Required properties:
> > -- compatible : should be "arm,juno-sram-ns" for Non-secure SRAM on Juno
> > +- compatible : should be "arm,juno-sram-ns" for Non-secure SRAM on Juno,
> > + or "amlogic,meson-gxbb-sram" for Amlogic GXBB SoC.
> Maybe you'd be better of with a meson-specific document that refers to
> these but with different compatible values.
> Come to think of it, the Juno-specific one maybe shouldn't be in
> arm,scpi at all, since that adds confusion here.
> It's somewhat confusing that ARM is both a platform, architecture and
> in some cases implementer of specific systems. :)
Sorry for that, I will move all juno specific references in the binding
out of this document(except the examples, which I assume should be fine)
> > The rest of the properties should follow the generic mmio-sram description
> > found in ../../sram/sram.txt
> > @@ -70,7 +71,8 @@ Each sub-node represents the reserved area for SCPI.
> > Required sub-node properties:
> > - reg : The base offset and size of the reserved area with the SRAM
> > - compatible : should be "arm,juno-scp-shmem" for Non-secure SRAM based
> > - shared memory on Juno platforms
> > + shared memory on Juno platforms or
> > + "amlogic,meson-gxbb-scp-shmem" for Amlogic GXBB SoC.
> Same here. It won't scale if all vendors are expected to add an entry here.
I will rework the patches to address the concerns as I too did share same
You may need to rework the DTS files based on that, please be aware of
that and make the necessary changes.
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