linux-kernel - Re: [PATCH v2] dt-bindings: clock: brcm,kona-ccu: convert to YAML

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Message-ID: <20231030-afternoon-traps-f7b20de220e2@spud>
Date:   Mon, 30 Oct 2023 11:41:47 +0000
From:   Conor Dooley <conor@...nel.org>
To:     Artur Weber <aweber.kernel@...il.com>
Cc:     Stanislav Jakubek <stano.jakubek@...il.com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Florian Fainelli <florian.fainelli@...adcom.com>,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        bcm-kernel-feedback-list@...adcom.com, linux-clk@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] dt-bindings: clock: brcm,kona-ccu: convert to YAML

On Sun, Oct 29, 2023 at 10:16:14PM +0100, Artur Weber wrote:
> 
> On 28/10/2023 13:30, Stanislav Jakubek wrote:
> > On Fri, Oct 27, 2023 at 03:47:48PM +0100, Conor Dooley wrote:
> > > On Tue, Oct 24, 2023 at 06:45:21PM +0200, Stanislav Jakubek wrote:
> > > > Convert Broadcom Kona family clock controller unit (CCU) bindings
> > > > to DT schema.
> > > 
> > > I didn't cross-check the clock-output-names, but this conversion mostly
> > > looks good to me.
> > > 
> > > > Changes during conversion:
> > > >    - remove "dmac" from clock-output-names for brcm,bcm11351-master-ccu,
> > > >      it is not used in DT nor the dt-bindings
> > > >    - remove "uartb4" from clock-output-names for brcm,bcm21664-slave-ccu,
> > > >      it is not used in DT nor the dt-bindings
> > > 
> > > This I'm not sure about - they _were_ documented in the text-form
> > > dt-binding, even if they weren't used in the dts. If the clock
> > > controller does actually produce these clocks, removing them doesn't
> > > make sense to me.
> > 
> > Hi Conor. Looking at downstream, I was not able to find these clocks, though
> > I admit that I'm not familiar enough with the downstream mess to be 100%
> > confident.
> > 
> >  From what I can tell, the BCM21664 arch/arm/mach-hawaii/clock.c (e.g. [1])
> > doesn't contain any mention of uartb4, only uartb, uartb2 and uartb3.
> > And similarly, for the BCM281XX arch/arm/mach-capri/clock_capri.c (e.g. [2])
> > I wasn't able to find any mention of dmac, only dmac_mux_apb and dma_axi
> > (though these two don't seem to be supported on mainline yet).
> 
> I've done some digging in the downstream kernel; for the BCM21664, I'm
> almost certain that the uartb4 clock doesn't exist. Broadcom helpfully
> left in "RDB" files containing the entire register layout of all of the
> components; and even in the RDB for the slave clock manager[1] (used by
> the other uart clocks), there is no uartb4, nor is it mentioned
> anywhere else in the kernel (judging by a quick grep in the kernel
> sources).
> 
> As for the BCM281XX clocks, there indeed doesn't seem to be an exact
> "dmac" clock but there is a "dmac" clock gate register[2], which is
> used for the dma_axi clock, so perhaps that's what this is referring
> to? Also not 100% certain.

I'm 99% sure I was happy with this otherwise, so thanks for doing the
investigation guys :)

Reviewed-by: Conor Dooley <conor.dooley@...rochip.com>

Cheers,
Conor.

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