linux-kernel - Re: [PATCH] PCI: fu740: fix finding gpios

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Message-ID: <20220204225308.GA225749@bhelgaas>
Date:   Fri, 4 Feb 2022 16:53:08 -0600
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Ben Dooks <ben.dooks@...ethink.co.uk>
Cc:     paul.walmsley@...ive.com, greentime.hu@...ive.com,
        lorenzo.pieralisi@....com, robh@...nel.org, kw@...ux.com,
        bhelgaas@...gle.com, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org
Subject: Re: [PATCH] PCI: fu740: fix finding gpios

Follow subject line convention (s/fix/Fix/, s/gpios/GPIOs/).

On Fri, Feb 04, 2022 at 05:38:21PM +0000, Ben Dooks wrote:
> The calls to devm_gpiod_get_optional() have the -gpios on
> the name. This means the pcie driver is not finding the
> necessary reset or power gpios to allow the pcie devices
> on the SiFive Unmatched boards.
> 
> Note, this was workng around 5.16 and may not have been
> broken? There is still an issue if uboot has not probed
> the pcie bus then there are no pcie devices shown when
> Linux is started.

Wrap to fill 75 columns
s/gpios/GPIOs/
s/pcie/PCIe/
s/workng/working/
s/to allow the pcie devices/to allow the PCIe devices <to something>?/

I can't tell what this is saying.  It used to work and something broke
it?  If so, we should have a "Fixes:" tag to identify the commit that
broke it.

Or it used to work and "may *not* have been broken"?  I'm confused.

Unclear how uboot is involved.

> Signed-off-by: Ben Dooks <ben.dooks@...ethink.co.uk>
> ---
>  drivers/pci/controller/dwc/pcie-fu740.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/pci/controller/dwc/pcie-fu740.c b/drivers/pci/controller/dwc/pcie-fu740.c
> index 00cde9a248b5..842b7202b96e 100644
> --- a/drivers/pci/controller/dwc/pcie-fu740.c
> +++ b/drivers/pci/controller/dwc/pcie-fu740.c
> @@ -259,11 +259,11 @@ static int fu740_pcie_probe(struct platform_device *pdev)
>  		return PTR_ERR(afp->mgmt_base);
>  
>  	/* Fetch GPIOs */
> -	afp->reset = devm_gpiod_get_optional(dev, "reset-gpios", GPIOD_OUT_LOW);
> +	afp->reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
>  	if (IS_ERR(afp->reset))
>  		return dev_err_probe(dev, PTR_ERR(afp->reset), "unable to get reset-gpios\n");
>  
> -	afp->pwren = devm_gpiod_get_optional(dev, "pwren-gpios", GPIOD_OUT_LOW);
> +	afp->pwren = devm_gpiod_get_optional(dev, "pwren", GPIOD_OUT_LOW);
>  	if (IS_ERR(afp->pwren))
>  		return dev_err_probe(dev, PTR_ERR(afp->pwren), "unable to get pwren-gpios\n");
>  
> -- 
> 2.34.1
>