linux-kernel - Re: [PATCH v5 3/7] dt-bindings: clock: jh7110-syscrg: Add PLL clock inputs

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Date:   Tue, 13 Jun 2023 20:17:41 +0100
From:   Conor Dooley <conor@...nel.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Xingyu Wu <xingyu.wu@...rfivetech.com>,
        linux-riscv@...ts.infradead.org, devicetree@...r.kernel.org,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Conor Dooley <conor+dt@...nel.org>,
        Emil Renner Berthing <emil.renner.berthing@...onical.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Hal Feng <hal.feng@...rfivetech.com>,
        William Qiu <william.qiu@...rfivetech.com>,
        linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org
Subject: Re: [PATCH v5 3/7] dt-bindings: clock: jh7110-syscrg: Add PLL clock
 inputs

On Tue, Jun 13, 2023 at 08:34:25PM +0200, Krzysztof Kozlowski wrote:
> On 13/06/2023 14:58, Xingyu Wu wrote:
> > Add optional PLL clock inputs from PLL clock generator.
> 
> Are you sure that PLLs are optional? Usually they are not...

They're not. What's happening here is the original binding was defined
without these clocks (obviously, since they're only being added now) so
for the driver they are still "optional" to keep compatibility.
In mainline, the driver takes the "osc" input and registers some
fixed-factor clocks to mimic these PLLs & after this patchset that is
only done as a fallback if the clock inputs to the clock controller,
from the PLLs, are missing.
They should not be optional in the dt-binding because they're not
optional in the hardware afaik!

Cheers,
Conor.

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