linux-kernel - Re: [PATCH V5 4/4] arm64: dts: meson: add S4 Soc Peripheral clock controller in DT

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Date:   Wed, 23 Nov 2022 15:13:23 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     neil.armstrong@...aro.org, Yu Tu <yu.tu@...ogic.com>,
        linux-clk@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-amlogic@...ts.infradead.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
        Neil Armstrong <narmstrong@...aro.org>,
        Jerome Brunet <jbrunet@...libre.com>,
        Kevin Hilman <khilman@...libre.com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Cc:     kelvin.zhang@...ogic.com
Subject: Re: [PATCH V5 4/4] arm64: dts: meson: add S4 Soc Peripheral clock
 controller in DT

On 23/11/2022 14:27, Neil Armstrong wrote:
> On 23/11/2022 11:10, Krzysztof Kozlowski wrote:
>> On 23/11/2022 03:13, Yu Tu wrote:
>>> Added information about the S4 SOC Peripheral Clock controller in DT.
>>>
>>> Signed-off-by: Yu Tu <yu.tu@...ogic.com>
>>> ---
>>>   arch/arm64/boot/dts/amlogic/meson-s4.dtsi | 26 +++++++++++++++++++++++
>>>   1 file changed, 26 insertions(+)
>>>
>>> diff --git a/arch/arm64/boot/dts/amlogic/meson-s4.dtsi b/arch/arm64/boot/dts/amlogic/meson-s4.dtsi
>>> index bd9c2ef83314..e7fab6e400be 100644
>>> --- a/arch/arm64/boot/dts/amlogic/meson-s4.dtsi
>>> +++ b/arch/arm64/boot/dts/amlogic/meson-s4.dtsi
>>> @@ -6,6 +6,8 @@
>>>   #include <dt-bindings/interrupt-controller/irq.h>
>>>   #include <dt-bindings/interrupt-controller/arm-gic.h>
>>>   #include <dt-bindings/gpio/gpio.h>
>>> +#include <dt-bindings/clock/amlogic,s4-pll-clkc.h>
>>> +#include <dt-bindings/clock/amlogic,s4-peripherals-clkc.h>
>>>   
>>>   / {
>>>   	cpus {
>>> @@ -100,6 +102,30 @@ clkc_pll: clock-controller@...0 {
>>>   				#clock-cells = <1>;
>>>   			};
>>>   
>>> +			clkc_periphs: clock-controller {
>>> +				compatible = "amlogic,s4-peripherals-clkc";
>>> +				reg = <0x0 0x0 0x0 0x49c>;
>>
>> This is broken... did you check for warnings?
> 
> This is actually fine, the parent node has a ranges property:
> https://github.com/torvalds/linux/blob/eb7081409f94a9a8608593d0fb63a1aa3d6f95d8/arch/arm64/boot/dts/amlogic/meson-s4.dtsi#L93

The parent ranges do not change here anything. You cannot have a reg
without unit address and the tools report it. No need to use reviewers
for this...

Best regards,
Krzysztof