[PATCH v4 6/8] dt-bindings: Add support for Amlogic GXBB SCPI Interface
sudeep.holla at arm.com
Wed Nov 2 21:37:10 PDT 2016
On 02/11/16 21:51, Rob Herring wrote:
> On Wed, Nov 2, 2016 at 5:20 PM, Sudeep Holla <sudeep.holla at arm.com> wrote:
>> 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.
> Just because I ack something, that doesn't mean don't review or
> comment on it further.
Sorry I didn't mean to say that. I was initially pushing for the generic
binding and since it was reworked many times already, I didn't want to
postpone any further just for sake of that. I completely understand that
component maintainers have to review the bindings too. So clearly it was
>> 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
> Guess I was optimistic that *every* platform wouldn't be different in
> some way. I should know better by now...
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