linux-kernel - Re: [PATCH v2 1/5] x86: clk: Add config option to enable 48MHz fixed fch clk

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Message-ID: <163417468443.936110.1163914591071839489@swboyd.mtv.corp.google.com>
Date:   Wed, 13 Oct 2021 18:24:44 -0700
From:   Stephen Boyd <sboyd@...nel.org>
To:     Ajit Kumar Pandey <AjitKumar.Pandey@....com>,
        linux-clk@...r.kernel.org
Cc:     Vijendar.Mukunda@....com, Basavaraj.Hiregoudar@....com,
        Sunil-kumar.Dommati@....com, Alexander.Deucher@....com,
        Ajit Kumar Pandey <AjitKumar.Pandey@....com>,
        Michael Turquette <mturquette@...libre.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/5] x86: clk: Add config option to enable 48MHz fixed fch clk

Quoting Ajit Kumar Pandey (2021-10-12 03:36:08)
> At present 48MHz clk support is only enabled for RV architecture
> using "is-rv" device property initialized from boot loader. This
> limit 48MHz fixed clock gate support to RV platform unless we add
> similar device property in boot loader for other architecture.
> 
> Add Kernel config option to enable 48MHz fixed clk gate registration
> with clock framework. This enahanced flexibility to enable 48MHz fch
> clock support on any platforms by simply enabling kernel config. Also
> replace RV with FIXED as generic naming convention across platforms.

What do we do if I enable CLK_FIXED_FCH in Kconfig but don't populate
the 48MHz clk? It's always present so this isn't actually a problem?
Why does the bootloader set an 'is-rv' property at all?