linux-kernel - Re: [PATCH 2/2] phy: freescale: Add i.MX8qm Mixel LVDS PHY support

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Date:   Sun, 19 Jun 2022 14:15:03 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Liu Ying <victor.liu@....com>, linux-phy@...ts.infradead.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Cc:     kishon@...com, vkoul@...nel.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, shawnguo@...nel.org,
        s.hauer@...gutronix.de, kernel@...gutronix.de, festevam@...il.com,
        linux-imx@....com
Subject: Re: [PATCH 2/2] phy: freescale: Add i.MX8qm Mixel LVDS PHY support

On 18/06/2022 11:22, Liu Ying wrote:
> This patch adds Freescale i.MX8qm LVDS PHY support.


Don't use "This patch".
https://elixir.bootlin.com/linux/v5.17.1/source/Documentation/process/submitting-patches.rst#L95

> The PHY IP is from Mixel, Inc.
> 
> Signed-off-by: Liu Ying <victor.liu@....com>



> +static int mixel_lvds_phy_probe(struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct phy_provider *phy_provider;
> +	struct mixel_lvds_phy_priv *priv;
> +	struct mixel_lvds_phy *lvds_phy;
> +	struct phy *phy;
> +	int i;
> +	int ret;
> +
> +	if (!dev->of_node)
> +		return -ENODEV;
> +
> +	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
> +	if (!priv)
> +		return -ENOMEM;
> +
> +	priv->regmap = syscon_node_to_regmap(dev->of_node->parent);
> +	if (IS_ERR(priv->regmap)) {
> +		ret = PTR_ERR(priv->regmap);
> +		dev_err_probe(dev, ret, "failed to get regmap\n");
> +		return ret;

All such calls are one-liners.

> +	}
> +
> +	priv->phy_ref_clk = devm_clk_get(dev, "phy_ref");
> +	if (IS_ERR(priv->phy_ref_clk)) {
> +		ret = PTR_ERR(priv->phy_ref_clk);
> +		dev_err_probe(dev, ret, "failed to get PHY reference clock\n");
> +		return ret;

Again, one line instead of three.

> +	}
> +
> +	mutex_init(&priv->lock);
> +
> +	dev_set_drvdata(dev, priv);
> +
> +	pm_runtime_enable(dev);
> +
> +	ret = mixel_lvds_phy_reset(dev);
> +	if (ret) {
> +		dev_err(dev, "failed to do POR reset: %d\n", ret);
> +		return ret;
> +	}
> +
> +	for (i = 0; i < PHY_NUM; i++) {
> +		lvds_phy = devm_kzalloc(dev, sizeof(*lvds_phy), GFP_KERNEL);
> +		if (!lvds_phy) {
> +			ret = -ENOMEM;
> +			goto err;
> +		}
> +
> +		phy = devm_phy_create(dev, NULL, &mixel_lvds_phy_ops);
> +		if (IS_ERR(phy)) {
> +			ret = PTR_ERR(phy);
> +			dev_err(dev, "failed to create PHY for channel%d: %d\n",
> +				i, ret);
> +			goto err;
> +		}
> +
> +		lvds_phy->phy = phy;
> +		lvds_phy->id = i;
> +		priv->phys[i] = lvds_phy;
> +
> +		phy_set_drvdata(phy, lvds_phy);
> +	}
> +
> +	phy_provider = devm_of_phy_provider_register(dev, mixel_lvds_phy_xlate);
> +	if (IS_ERR(phy_provider)) {
> +		ret = PTR_ERR(phy_provider);
> +		dev_err(dev, "failed to register PHY provider: %d\n", ret);
> +		goto err;
> +	}
> +
> +	return 0;
> +err:
> +	pm_runtime_disable(dev);
> +
> +	return ret;
> +}
> +
> +static int mixel_lvds_phy_remove(struct platform_device *pdev)
> +{
> +	pm_runtime_disable(&pdev->dev);
> +
> +	return 0;
> +}
> +
> +static int __maybe_unused mixel_lvds_phy_runtime_suspend(struct device *dev)
> +{
> +	struct mixel_lvds_phy_priv *priv = dev_get_drvdata(dev);
> +
> +	/* power down */
> +	mutex_lock(&priv->lock);
> +	regmap_write(priv->regmap, PHY_CTRL + REG_SET, PD);
> +	mutex_unlock(&priv->lock);
> +
> +	dev_dbg(dev, "runtime suspended\n");
> +
> +	return 0;
> +}
> +
> +static int __maybe_unused mixel_lvds_phy_runtime_resume(struct device *dev)
> +{
> +	struct mixel_lvds_phy_priv *priv = dev_get_drvdata(dev);
> +
> +	/* power up + control initialization */
> +	mutex_lock(&priv->lock);
> +	regmap_update_bits(priv->regmap, PHY_CTRL,
> +			   CTRL_INIT_MASK | PD, CTRL_INIT_VAL);
> +	mutex_unlock(&priv->lock);
> +
> +	dev_dbg(dev, "runtime resumed\n");

No such debug messages.


Best regards,
Krzysztof