linux-kernel - Re: [PATCH 14/26] net: stmmac: dwmac-qcom-ethqos: add optional phyaux clock

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Message-ID: <20230612204252.kb57m72ehazt4bco@halaney-x13s>
Date:   Mon, 12 Jun 2023 15:42:52 -0500
From:   Andrew Halaney <ahalaney@...hat.com>
To:     Bartosz Golaszewski <brgl@...ev.pl>
Cc:     Vinod Koul <vkoul@...nel.org>,
        Bhupesh Sharma <bhupesh.sharma@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Kishon Vijay Abraham I <kishon@...nel.org>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Jose Abreu <joabreu@...opsys.com>, netdev@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-phy@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-stm32@...md-mailman.stormreply.com,
        Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: Re: [PATCH 14/26] net: stmmac: dwmac-qcom-ethqos: add optional
 phyaux clock

On Mon, Jun 12, 2023 at 11:23:43AM +0200, Bartosz Golaszewski wrote:
> From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
> 
> On sa8775p we don't use the RGMII clock but have an additional PHYAUX
> clock so add support for it to the driver.
> 
> Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
> ---
>  .../ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c   | 15 +++++++++++++++
>  1 file changed, 15 insertions(+)
> 
> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
> index 252dca400071..2f6b9b419601 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
> @@ -94,6 +94,7 @@ struct qcom_ethqos {
>  
>  	unsigned int rgmii_clk_rate;
>  	struct clk *rgmii_clk;
> +	struct clk *phyaux_clk;
>  	struct phy *serdes_phy;
>  	unsigned int speed;
>  
> @@ -604,6 +605,13 @@ static int ethqos_clks_config(void *priv, bool enabled)
>  			return ret;
>  		}
>  
> +		ret = clk_prepare_enable(ethqos->phyaux_clk);
> +		if (ret) {
> +			clk_disable_unprepare(ethqos->rgmii_clk);
> +			dev_err(&ethqos->pdev->dev, "phyaux enable failed\n");
> +			return ret;
> +		}
> +
>  		/* Enable functional clock to prevent DMA reset to timeout due
>  		 * to lacking PHY clock after the hardware block has been power
>  		 * cycled. The actual configuration will be adjusted once
> @@ -611,6 +619,7 @@ static int ethqos_clks_config(void *priv, bool enabled)
>  		 */
>  		ethqos_set_func_clk_en(ethqos);
>  	} else {
> +		clk_disable_unprepare(ethqos->phyaux_clk);
>  		clk_disable_unprepare(ethqos->rgmii_clk);
>  	}
>  
> @@ -669,6 +678,12 @@ static int qcom_ethqos_probe(struct platform_device *pdev)
>  		goto out_config_dt;
>  	}
>  
> +	ethqos->phyaux_clk = devm_clk_get_optional(dev, "phyaux");
> +	if (IS_ERR(ethqos->phyaux_clk)) {
> +		ret = PTR_ERR(ethqos->phyaux_clk);
> +		goto out_config_dt;
> +	}
> +

Similar comment to the prior patch about whether or not this should be
optional (or selected via platform compatible and required),
otherwise looks good.

>  	ret = ethqos_clks_config(ethqos, true);
>  	if (ret)
>  		goto out_config_dt;
> -- 
> 2.39.2
>