linux-kernel - Re: [PATCH 03/26] phy: qcom: add the SGMII SerDes PHY driver

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Date:   Mon, 12 Jun 2023 11:45:42 +0200
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Bartosz Golaszewski <brgl@...ev.pl>, Vinod Koul <vkoul@...nel.org>,
        Bhupesh Sharma <bhupesh.sharma@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.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>
Cc:     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 03/26] phy: qcom: add the SGMII SerDes PHY driver



On 12.06.2023 11:23, Bartosz Golaszewski wrote:
> From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
> 
> Implement support for the SGMII/SerDes PHY present on various Qualcomm
> platforms.
> 
> Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
> ---
> +static const struct regmap_config qcom_dwmac_sgmii_phy_regmap_cfg = {
> +	.reg_bits		= 32,
> +	.val_bits		= 32,
> +	.reg_stride		= 4,
> +	.use_relaxed_mmio	= true,
> +	.disable_locking	= true,
The last two are rather brave, no?

Konrad
> +};
> +
> +static int qcom_dwmac_sgmii_phy_probe(struct platform_device *pdev)
> +{
> +	struct qcom_dwmac_sgmii_phy_data *data;
> +	struct device *dev = &pdev->dev;
> +	struct phy_provider *provider;
> +	struct clk *refclk;
> +	void __iomem *base;
> +	struct phy *phy;
> +
> +	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
> +	if (!data)
> +		return -ENOMEM;
> +
> +	base = devm_platform_ioremap_resource(pdev, 0);
> +	if (IS_ERR(base))
> +		return PTR_ERR(base);
> +
> +	data->regmap = devm_regmap_init_mmio(dev, base,
> +					     &qcom_dwmac_sgmii_phy_regmap_cfg);
> +	if (IS_ERR(data->regmap))
> +		return PTR_ERR(data->regmap);
> +
> +	phy = devm_phy_create(dev, NULL, &qcom_dwmac_sgmii_phy_ops);
> +	if (IS_ERR(phy))
> +		return PTR_ERR(phy);
> +
> +	refclk = devm_clk_get_enabled(dev, "sgmi_ref");
> +	if (IS_ERR(refclk))
> +		return PTR_ERR(refclk);
> +
> +	provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
> +	if (IS_ERR(provider))
> +		return PTR_ERR(provider);
> +
> +	phy_set_drvdata(phy, data);
> +	platform_set_drvdata(pdev, data);
> +
> +	return 0;
> +}
> +
> +static const struct of_device_id qcom_dwmac_sgmii_phy_of_match[] = {
> +	{ .compatible = "qcom,sa8775p-dwmac-sgmii-phy" },
> +	{ },
> +};
> +MODULE_DEVICE_TABLE(of, qcom_dwmac_sgmii_phy_of_match);
> +
> +static struct platform_driver qcom_dwmac_sgmii_phy_driver = {
> +	.probe	= qcom_dwmac_sgmii_phy_probe,
> +	.driver = {
> +		.name	= "qcom-dwmac-sgmii-phy",
> +		.of_match_table	= qcom_dwmac_sgmii_phy_of_match,
> +	}
> +};
> +
> +module_platform_driver(qcom_dwmac_sgmii_phy_driver);
> +
> +MODULE_DESCRIPTION("Qualcomm DWMAC SGMII PHY driver");
> +MODULE_LICENSE("GPL");