linux-kernel - Re: [PATCH v3 1/2] dt-bindings: clock: fixed-clock: Add nvmem support

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Date:   Thu, 08 Jun 2023 16:19:57 -0700
From:   Stephen Boyd <sboyd@...nel.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Mike Looijmans <mike.looijmans@...ic.nl>,
        devicetree@...r.kernel.org, linux-clk@...r.kernel.org
Cc:     Conor Dooley <conor+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Michael Turquette <mturquette@...libre.com>,
        Rob Herring <robh+dt@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/2] dt-bindings: clock: fixed-clock: Add nvmem support

Quoting Mike Looijmans (2023-06-05 07:00:16)
> On 05-06-2023 15:38, Krzysztof Kozlowski wrote:
> > On 05/06/2023 15:34, Mike Looijmans wrote:
> >> diff --git a/Documentation/devicetree/bindings/clock/fixed-clock.yaml b/Documentation/devicetree/bindings/clock/fixed-clock.yaml
> >> index b0a4fb8256e2..23e4df96d3b0 100644
> >> --- a/Documentation/devicetree/bindings/clock/fixed-clock.yaml
> >> +++ b/Documentation/devicetree/bindings/clock/fixed-clock.yaml
> >> @@ -12,7 +12,9 @@ maintainers:
> >>   
> >>   properties:
> >>     compatible:
> >> -    const: fixed-clock
> >> +    enum:
> >> +      - fixed-clock
> >> +      - fixed-clock-nvmem
> > Do you even need new compatible? Isn't this the same clock from the
> > hardware point of view?
> 
> I need a new compatible because a "fixed-clock" only loads at init time. 
> It registers using CLK_OF_DECLARE, which requires the clock to register 
> early. NVMEM providers are typical devices like I2C EEPROMs that won't 
> be available at that point, hence I needed to create a clock that 
> registers as a regular clock driver and can handle deferral and similar.

What is builtin_platform_driver(of_fixed_clk_driver)?