linux-kernel - Re: [PATCH] spi: microchip-core: fix passing zero to PTR

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Message-ID: <YqnVVizga14qNxkt@sirena.org.uk>
Date:   Wed, 15 Jun 2022 13:49:26 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Conor.Dooley@...rochip.com
Cc:     Daire.McNamara@...rochip.com, Lewis.Hanly@...rochip.com,
        linux-riscv@...ts.infradead.org, linux-spi@...r.kernel.org,
        linux-kernel@...r.kernel.org, dan.carpenter@...cle.com
Subject: Re: [PATCH] spi: microchip-core: fix passing zero to PTR_ERR warning

On Wed, Jun 15, 2022 at 12:42:27PM +0000, Conor.Dooley@...rochip.com wrote:
> On 15/06/2022 13:37, Mark Brown wrote:

> >> But if spi->clk is NULL, this will return 0 from the probe
> >> rather than returning an error?
> >> If that's not what you meant, lmk

> > Oh, hang on - what error conditions can clk_get() return 0 in?  The
> > documentation doesn't mention any...

> If !CONFIG_HAVE_CLK, (without which it won't boot on the coreplex)
> but I don't think I can be sure that CONFIG_HAVE_CLK will /always/
> be enabled for other uses of the FPGA.

That's not an error, that's returning NULL as a dummy clock.  The
expectation is that the driver will proceed as though it has a clock.

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