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 22:27:28 +0800
From:   Yu Tu <yu.tu@...ogic.com>
To:     <neil.armstrong@...aro.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        <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 2022/11/23 22:21, neil.armstrong@...aro.org wrote:
> [ EXTERNAL EMAIL ]
> 
> 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.

Okay.

> 
> Neil
> 
>>
>> Best regards,
>> Krzysztof
>>
> 
> .