linux-kernel - Re: [PATCH v6 2/5] dt-bindings: clock: add Amlogic T7 SCMI clock controller

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Message-ID: <dd90b445-bafb-46d4-8cec-e0877cf425b3@amlogic.com>
Date: Mon, 8 Dec 2025 16:40:57 +0800
From: Jian Hu <jian.hu@...ogic.com>
To: Krzysztof Kozlowski <krzk@...nel.org>
Cc: Jerome Brunet <jbrunet@...libre.com>,
 Xianwei Zhao <xianwei.zhao@...ogic.com>, Chuan Liu <chuan.liu@...ogic.com>,
 Neil Armstrong <neil.armstrong@...aro.org>,
 Kevin Hilman <khilman@...libre.com>, Stephen Boyd <sboyd@...nel.org>,
 Michael Turquette <mturquette@...libre.com>, robh+dt <robh+dt@...nel.org>,
 Rob Herring <robh@...nel.org>, devicetree <devicetree@...r.kernel.org>,
 linux-clk <linux-clk@...r.kernel.org>,
 linux-amlogic <linux-amlogic@...ts.infradead.org>,
 linux-kernel <linux-kernel@...r.kernel.org>,
 linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v6 2/5] dt-bindings: clock: add Amlogic T7 SCMI clock
 controller

Hi, Krzysztof


Thans for your review.

On 12/8/2025 2:17 PM, Krzysztof Kozlowski wrote:
> [ EXTERNAL EMAIL ]
>
> On Thu, Dec 04, 2025 at 01:36:31PM +0800, Jian Hu wrote:
>> Add DT bindings for the SCMI clock controller of the Amlogic T7 SoC family.
>>
>> Signed-off-by: Jian Hu <jian.hu@...ogic.com>
>> Acked-by: Rob Herring (Arm) <robh@...nel.org>
>> ---
>>   include/dt-bindings/clock/amlogic,t7-scmi.h | 47 +++++++++++++++++++++
>>   1 file changed, 47 insertions(+)
>>   create mode 100644 include/dt-bindings/clock/amlogic,t7-scmi.h
>>
> Where is any binding doc for this? Why is this a separate patch?


The ARM SCMI device tree binding specification is located at 
./Documentation/devicetree/bindings/firmware/arm,scmi.yaml.

Certain secure clocks on the T7 rely on the ARM SCMI driver stack, which 
is officially supported by ARM.

The kernel-side SCMI client implementation resides in 
./drivers/firmware/arm_scmi/.

To enable ARM SCMI on T7, three components are needed:

- Kernel-side definition of ARM SCMI clock indices (this patch addresses 
this component);
- SCMI server implementation in the ARM Trusted Firmware (ATF) running 
at Exception Level 3 (EL3), which has been integrated into the bootloader;
- Device Tree Source (DTS) configuration for ARM SCMI clock nodes (the 
DTS changes will be submitted after the T7 clock driver patches are 
merged upstream).


>
> Best regards,
> Krzysztof
>