linux-kernel - Re: [PATCH v2 1/8] arm64: dts: meson: g12a: Add AO Clock + Reset Controller support

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Message-ID: <7f391daf-db70-101a-18c7-04abf9c5a164@baylibre.com>
Date:   Tue, 19 Mar 2019 09:47:06 +0100
From:   Neil Armstrong <narmstrong@...libre.com>
To:     Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Cc:     khilman@...libre.com, linux-amlogic@...ts.infradead.org,
        Jerome Brunet <jbrunet@...libre.com>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 1/8] arm64: dts: meson: g12a: Add AO Clock + Reset
 Controller support

On 18/03/2019 21:02, Martin Blumenstingl wrote:
> Hi Neil,
> 
> On Mon, Mar 18, 2019 at 10:59 AM Neil Armstrong <narmstrong@...libre.com> wrote:
>>
>> Add nodes and properties for the AO Clocks and Resets.
>>
>> Signed-off-by: Neil Armstrong <narmstrong@...libre.com>
>> Signed-off-by: Jerome Brunet <jbrunet@...libre.com>
>> ---
>>  arch/arm64/boot/dts/amlogic/meson-g12a.dtsi | 18 ++++++++++++++++++
>>  1 file changed, 18 insertions(+)
>>
>> diff --git a/arch/arm64/boot/dts/amlogic/meson-g12a.dtsi b/arch/arm64/boot/dts/amlogic/meson-g12a.dtsi
>> index 31ddf9444b3e..5c0983edf837 100644
>> --- a/arch/arm64/boot/dts/amlogic/meson-g12a.dtsi
>> +++ b/arch/arm64/boot/dts/amlogic/meson-g12a.dtsi
>> @@ -4,6 +4,7 @@
>>   */
>>
>>  #include <dt-bindings/gpio/gpio.h>
>> +#include <dt-bindings/clock/g12a-clkc.h>
>>  #include <dt-bindings/interrupt-controller/irq.h>
>>  #include <dt-bindings/interrupt-controller/arm-gic.h>
>>
>> @@ -122,6 +123,23 @@
>>                         #size-cells = <2>;
>>                         ranges = <0x0 0x0 0x0 0xff800000 0x0 0x100000>;
>>
>> +                       rti: sys-ctrl@0 {
>> +                               compatible = "amlogic,meson-gx-ao-sysctrl",
>> +                                            "simple-mfd", "syscon";
>> +                               reg = <0x0 0x0 0x0 0x100>;
>> +                               #address-cells = <2>;
>> +                               #size-cells = <2>;
>> +                               ranges = <0x0 0x0 0x0 0x0 0x0 0x100>;
> sorry for noticing this only very late: I missed the #address-cells,
> #size-cells and ranges property in my last review
> do you have any change queued which requires this?
> my understanding is that the drivers for all RTI children should use
> the register offsets relative to the RTI start address. In that case
> the child nodes neither have a unit-address nor a reg property, making
> the last three properties unnecessary.

We need the address-cells/size-cells and `ranges;` to satisfy the need
for the gpio subnode of the pinctrl node.

For GX, we didn't add the pinctrl in the sysctrl_AO subnode, but we should
overwise we have overlapping.

Neil

> 
> 
> Regards
> Martin
>