linux-kernel - Re: [PATCH v3 07/11] dt-bindings: clock: Add StarFive JH7110 system clock and reset generator

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Date:   Fri, 17 Feb 2023 16:47:48 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Conor Dooley <conor.dooley@...rochip.com>,
        Hal Feng <hal.feng@...rfivetech.com>
Cc:     Conor Dooley <conor@...nel.org>, linux-riscv@...ts.infradead.org,
        devicetree@...r.kernel.org, linux-clk@...r.kernel.org,
        Palmer Dabbelt <palmer@...belt.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Stephen Boyd <sboyd@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Emil Renner Berthing <emil.renner.berthing@...onical.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 07/11] dt-bindings: clock: Add StarFive JH7110 system
 clock and reset generator

On 17/02/2023 14:32, Conor Dooley wrote:
>>>> Yes, it is.
>>>
>>> Which would then make GMAC1 RGMII RX optional, rather than required?
>>
>> If thinking in this way, I must say yes, it is optional. But actually
>> GMAC1 RGMII RX feeds gmac1_rx by default. 
>> For a mux, it usually works if you populate only one input to it.
>> Does it mean all the other inputs are optional? And how can we define
>> which input is required?
> 
> I'm not sure, that is a question for Krzysztof and/or Rob.

That's a long thread, please summarize what you ask. Otherwise I have no
clue what is the question.

Does the mux works correctly if clock input is not connected? I mean,
are you now talking about real hardware or some simplification from SW
point of view?

Best regards,
Krzysztof