linux-kernel - Re: [PATCH 1/3] net: stmmac: dwmac-qcom-ethqos: Return device_get_phy

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Date:   Thu, 29 Jun 2023 22:28:42 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Andrew Halaney <ahalaney@...hat.com>
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-stm32@...md-mailman.stormreply.com, netdev@...r.kernel.org,
        mcoquelin.stm32@...il.com, pabeni@...hat.com, kuba@...nel.org,
        edumazet@...gle.com, davem@...emloft.net, joabreu@...opsys.com,
        alexandre.torgue@...s.st.com, peppe.cavallaro@...com,
        bhupesh.sharma@...aro.org, vkoul@...nel.org,
        bartosz.golaszewski@...aro.org
Subject: Re: [PATCH 1/3] net: stmmac: dwmac-qcom-ethqos: Return
 device_get_phy_mode() errors properly

On Thu, Jun 29, 2023 at 02:14:16PM -0500, Andrew Halaney wrote:
> Other than -ENODEV, other errors resulted in -EINVAL being returned
> instead of the actual error.
> 
> Signed-off-by: Andrew Halaney <ahalaney@...hat.com>
> ---
>  drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
> index e62940414e54..3bf025e8e2bd 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
> @@ -721,6 +721,9 @@ static int qcom_ethqos_probe(struct platform_device *pdev)
>  		return -ENOMEM;
>  
>  	ethqos->phy_mode = device_get_phy_mode(dev);
> +	if (ethqos->phy_mode < 0)
> +		return dev_err_probe(dev, ethqos->phy_mode,
> +				     "Failed to get phy mode\n");

If this every used on anything other than device tree?

of_get_phy_mode() has a better API, there is a clear separation of the
return value indicating success/fail, and the interface mode found in
DT. You can then change phy_mode in struct qcom_ethqos to be
phy_interface_t.

	Andrew