Subject: Re: [RFC PATCH v2 3/8] net: pcs: pcs-mtk-lynxi: add platform driver for MT7988

From: Maxime Chevallier <[email-masked]>
Date: Wed, 6 Dec 2023 10:38:26 +0100

Hello Daniel,

My two cents below :

On Wed, 6 Dec 2023 01:44:17 +0000
Daniel Golle <[email-masked]> wrote:

> Introduce a proper platform MFD driver for the LynxI (H)SGMII PCS which
> is going to initially be used for the MT7988 SoC.
> 
> Signed-off-by: Daniel Golle <[email-masked]>

 [ ... ]

> +static int mtk_pcs_lynxi_enable(struct phylink_pcs *pcs)
> +{
> +	struct mtk_pcs_lynxi *mpcs = pcs_to_mtk_pcs_lynxi(pcs);
> +
> +	if (mpcs->sgmii_tx && mpcs->sgmii_rx) {
> +		clk_prepare_enable(mpcs->sgmii_rx);
> +		clk_prepare_enable(mpcs->sgmii_tx);

You can use the clk_bulk_prepare_enable() here

> +	}
> +
> +	return 0;
> +}
> +
>  static void mtk_pcs_lynxi_disable(struct phylink_pcs *pcs)
>  {
>  	struct mtk_pcs_lynxi *mpcs = pcs_to_mtk_pcs_lynxi(pcs);
>  
> +	regmap_set_bits(mpcs->regmap, SGMSYS_QPHY_PWR_STATE_CTRL, SGMII_PHYA_PWD);
> +
> +	if (mpcs->sgmii_tx && mpcs->sgmii_rx) {
> +		clk_disable_unprepare(mpcs->sgmii_tx);
> +		clk_disable_unprepare(mpcs->sgmii_rx);

and clk_bulk_disable_unprepare() here

 [...]

> +static int mtk_pcs_lynxi_probe(struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct device_node *np = dev->of_node;
> +	struct mtk_pcs_lynxi *mpcs;
> +	struct phylink_pcs *pcs;
> +	struct regmap *regmap;
> +	u32 flags = 0;
> +
> +	mpcs = devm_kzalloc(dev, sizeof(*mpcs), GFP_KERNEL);
> +	if (!mpcs)
> +		return -ENOMEM;
> +
> +	regmap = syscon_node_to_regmap(np->parent);
> +	if (IS_ERR(regmap))
> +		return PTR_ERR(regmap);
> +
> +	if (of_property_read_bool(np->parent, "mediatek,pnswap"))
> +		flags |= MTK_SGMII_FLAG_PN_SWAP;
> +
> +	mpcs->rstc = of_reset_control_get_shared(np->parent, NULL);
> +	if (IS_ERR(mpcs->rstc))
> +		return PTR_ERR(mpcs->rstc);
> +
> +	reset_control_deassert(mpcs->rstc);
> +	mpcs->sgmii_sel = devm_clk_get_enabled(dev, "sgmii_sel");
> +	if (IS_ERR(mpcs->sgmii_sel))
> +		return PTR_ERR(mpcs->sgmii_sel);
> +
> +	mpcs->sgmii_rx = devm_clk_get(dev, "sgmii_rx");
> +	if (IS_ERR(mpcs->sgmii_rx))
> +		return PTR_ERR(mpcs->sgmii_rx);
> +
> +	mpcs->sgmii_tx = devm_clk_get(dev, "sgmii_tx");
> +	if (IS_ERR(mpcs->sgmii_tx))
> +		return PTR_ERR(mpcs->sgmii_tx);

and clk bulk operations here as well ?

Maxime