linux-kernel - Re: [PATCH] dt-bindings: clock: ti: Convert interface.txt to json-schema

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Message-ID: <20231128104310.GS5169@atomide.com>
Date:   Tue, 28 Nov 2023 12:43:10 +0200
From:   Tony Lindgren <tony@...mide.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Andreas Kemnade <andreas@...nade.info>, mturquette@...libre.com,
        sboyd@...nel.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
        kristo@...nel.org, linux-clk@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-omap@...r.kernel.org
Subject: Re: [PATCH] dt-bindings: clock: ti: Convert interface.txt to
 json-schema

* Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org> [231128 08:41]:
> On 28/11/2023 09:32, Andreas Kemnade wrote:
> > On Tue, 28 Nov 2023 09:00:16 +0100
> > Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org> wrote:
> > 
> >>> +required:
> >>> +  - compatible
> >>> +  - clocks
> >>> +  - '#clock-cells'  
> >>
> >> reg is required. Device cannot take "reg" from parent, DTS does not work
> >> like this.
> > 
> > Well, apparently they do... and I am just dealing with status quo and not
> > how it should be.
> > Look at commit 31fc1c63c2ae4a542e3c7ac572a10a59ece45c24
> 
> Who designed clock-controller binding with a device node per each clock?
> This is ridiculous (although of course not your fault here)! Looking at
> omap3xxx-clocks.dtsi - all its children should be just defined by the
> driver, not by DTSI.

Earlier all the clocks were separate nodes, the ti,clksel binding made
things a bit better by grouping the seprate clock nodes so we don't have
multiple nodes with the same reg.. But yeah clksel instance clocks should
be clock@6 with reg = <6> if the clock bits are at bit 6. That would be
fairly easy to do if that helps, but in general I doubt anybody's going
to spend much effort to fix the omap3 legacy clocks atthis point.

For omap4 and later, things are a bit better as they use the clkctrl clocks:

Documentation/devicetree/bindings/clock/ti-clkctrl.txt

I don't think omap3 has any clkctrl clocks but if it does then that could
be used.

Regards,

Tony