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Date:   Mon, 12 Jun 2023 15:40:42 -0500
From:   Andrew Halaney <ahalaney@redhat.com>
To:     Bartosz Golaszewski <brgl@bgdev.pl>
Cc:     Vinod Koul <vkoul@kernel.org>,
        Bhupesh Sharma <bhupesh.sharma@linaro.org>,
        Andy Gross <agross@kernel.org>,
        Bjorn Andersson <andersson@kernel.org>,
        Konrad Dybcio <konrad.dybcio@linaro.org>,
        "David S . Miller" <davem@davemloft.net>,
        Eric Dumazet <edumazet@google.com>,
        Jakub Kicinski <kuba@kernel.org>,
        Paolo Abeni <pabeni@redhat.com>,
        Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Conor Dooley <conor+dt@kernel.org>,
        Kishon Vijay Abraham I <kishon@kernel.org>,
        Giuseppe Cavallaro <peppe.cavallaro@st.com>,
        Alexandre Torgue <alexandre.torgue@foss.st.com>,
        Jose Abreu <joabreu@synopsys.com>, netdev@vger.kernel.org,
        linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-phy@lists.infradead.org,
        linux-arm-kernel@lists.infradead.org,
        linux-stm32@st-md-mailman.stormreply.com,
        Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Subject: Re: [PATCH 13/26] net: stmmac: dwmac-qcom-ethqos: make the rgmii
 clock optional
Message-ID: <20230612204042.litbbv23zdb3u5k7@halaney-x13s>
References: <20230612092355.87937-1-brgl@bgdev.pl>
 <20230612092355.87937-14-brgl@bgdev.pl>
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On Mon, Jun 12, 2023 at 11:23:42AM +0200, Bartosz Golaszewski wrote:
> From: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
> 
> On sa8775p there's no RGMII clock so make it optional in the driver.
> 
> Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
> ---
>  drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
> index 3438b6229351..252dca400071 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
> @@ -663,7 +663,7 @@ static int qcom_ethqos_probe(struct platform_device *pdev)
>  	ethqos->rgmii_config_loopback_en = data->rgmii_config_loopback_en;
>  	ethqos->has_emac3 = data->has_emac3;
>  
> -	ethqos->rgmii_clk = devm_clk_get(dev, "rgmii");
> +	ethqos->rgmii_clk = devm_clk_get_optional(dev, "rgmii");

This makes it optional for older platforms too, but as far as I know on
those platforms it is mandatory.

This can be enforced in dt-binding checks, but should we also enforce
that in the driver still? Honestly I feel like yes, but there's probably
some precedent maintainers follow on this front that I don't know of.


>  	if (IS_ERR(ethqos->rgmii_clk)) {
>  		ret = PTR_ERR(ethqos->rgmii_clk);
>  		goto out_config_dt;
> -- 
> 2.39.2
>