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

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Message-ID: <2153a111-d5f0-94cf-9cfc-f8ce4b084a1c@linaro.org>
Date:   Wed, 23 Nov 2022 15:21:39 +0100
From:   neil.armstrong@...aro.org
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...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 15:13, Krzysztof Kozlowski wrote:
> 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...

Oh I see now, I simply looked at the reg property, not the unit address.

Sorry indeed it's wrong and DTC should complain.

Yu, you should probably update your DTC version.

Neil

> 
> Best regards,
> Krzysztof
>