linux-kernel - Re: [PATCH 3/6] dt-bindings: soc: amlogic: document System Control registers

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Date:   Sat, 11 Feb 2023 21:25:30 +0100
From:   Martin Blumenstingl <martin.blumenstingl@...glemail.com>
To:     Neil Armstrong <neil.armstrong@...aro.org>
Cc:     Alessandro Zummo <a.zummo@...ertech.it>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Kevin Hilman <khilman@...libre.com>,
        Jerome Brunet <jbrunet@...libre.com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>, linux-rtc@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-amlogic@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-clk@...r.kernel.org
Subject: Re: [PATCH 3/6] dt-bindings: soc: amlogic: document System Control registers

Hi Neil,

On Thu, Feb 9, 2023 at 2:41 PM Neil Armstrong <neil.armstrong@...aro.org> wrote:
>
> Document the System Control registers regions found on all Amlogic
> SoC families and it's clock, power, pinctrl and phy subnodes.
I understand clock (main clock controller) power (power domain
controller) and PHY (HDMI and CVBS PHYs). Are you sure about pinctrl?

[...]
> +properties:
> +  compatible:
> +    items:
> +      - enum:
> +          - amlogic,meson-gx-hhi-sysctrl
> +          - amlogic,meson-gx-ao-sysctrl
> +          - amlogic,meson-axg-hhi-sysctrl
> +          - amlogic,meson-axg-ao-sysctrl
If you have to re-send this then it would be great if you could add:
          - amlogic,meson-hhi-sysctrl
because we already have that in arch/arm/boot/dts/meson.dtsi for the
32-bit SoCs.

[...]
> +        power-controller {
> +            compatible = "amlogic,meson-gxbb-pwrc";
> +            #power-domain-cells = <1>;
> +            amlogic,ao-sysctrl = <&sysctrl_AO>;
For this node (and similar ones) I have a question to the device-tree
maintainers:
The power controller has a dedicated sub-range of registers. This also
applies to the CVBS and HDMI PHYs.
But the clock controller does not (it has its registers all over the
place - unfortunately that's how the hardware is).
I have been asked to add a "reg" property to child nodes with a
sub-register space.
Does this mean we need to add a reg property here as well (regardless
of whether we're using it in the driver or not)? And what to do in
case of the clock controller though?


Best regards,
Martin