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Date:   Wed, 6 Dec 2023 10:38:26 +0100
From:   Maxime Chevallier <maxime.chevallier@bootlin.com>
To:     Daniel Golle <daniel@makrotopia.org>
Cc:     "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>,
        Chunfeng Yun <chunfeng.yun@mediatek.com>,
        Vinod Koul <vkoul@kernel.org>,
        Kishon Vijay Abraham I <kishon@kernel.org>,
        Felix Fietkau <nbd@nbd.name>, John Crispin <john@phrozen.org>,
        Sean Wang <sean.wang@mediatek.com>,
        Mark Lee <Mark-MC.Lee@mediatek.com>,
        Lorenzo Bianconi <lorenzo@kernel.org>,
        Matthias Brugger <matthias.bgg@gmail.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@collabora.com>,
        Andrew Lunn <andrew@lunn.ch>,
        Heiner Kallweit <hkallweit1@gmail.com>,
        Russell King <linux@armlinux.org.uk>,
        Alexander Couzens <lynxis@fe80.eu>,
        Qingfang Deng <dqfext@gmail.com>,
        SkyLake Huang <SkyLake.Huang@mediatek.com>,
        Philipp Zabel <p.zabel@pengutronix.de>, netdev@vger.kernel.org,
        devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org,
        linux-mediatek@lists.infradead.org, linux-phy@lists.infradead.org
Subject: Re: [RFC PATCH v2 3/8] net: pcs: pcs-mtk-lynxi: add platform driver
 for MT7988
Message-ID: <20231206103826.4e396513@device.home>
In-Reply-To: <68bb81ac6bf99393c8de256f42e5715626590af8.1701826319.git.daniel@makrotopia.org>
References: <cover.1701826319.git.daniel@makrotopia.org>
        <68bb81ac6bf99393c8de256f42e5715626590af8.1701826319.git.daniel@makrotopia.org>
Organization: Bootlin
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Precedence: bulk

Hello Daniel,

My two cents below :

On Wed, 6 Dec 2023 01:44:17 +0000
Daniel Golle <daniel@makrotopia.org> 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 <daniel@makrotopia.org>

 [ ... ]

> +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