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Message-ID: <117dc1503ecd07448cc2e0b036b34a49f5e8c38e.camel@pengutronix.de>
Subject: Re: [RFC PATCH 6/8] net: pcs: add driver for MediaTek USXGMII PCS
From:   Philipp Zabel <p.zabel@pengutronix.de>
To:     Daniel Golle <daniel@makrotopia.org>,
        "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>, 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
Date:   Mon, 27 Nov 2023 14:25:12 +0100
In-Reply-To: <b9f787f3e4aa36e148d7595495af60db53f74417.1699565880.git.daniel@makrotopia.org>
References: <cover.1699565880.git.daniel@makrotopia.org>
         <b9f787f3e4aa36e148d7595495af60db53f74417.1699565880.git.daniel@makrotopia.org>
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On Do, 2023-11-09 at 21:51 +0000, Daniel Golle wrote:
> Add driver for USXGMII PCS found in the MediaTek MT7988 SoC and supporting
> USXGMII, 10GBase-R and 5GBase-R interface modes. In order to support
> Cisco SGMII, 1000Base-X and 2500Base-X via the also present LynxI PCS
> create a wrapped PCS taking care of the components shared between the
> new USXGMII PCS and the legacy LynxI PCS.
> 
> Signed-off-by: Daniel Golle <daniel@makrotopia.org>
> ---
[...]
> diff --git a/drivers/net/pcs/pcs-mtk-usxgmii.c b/drivers/net/pcs/pcs-mtk-usxgmii.c
> new file mode 100644
> index 0000000000000..b3ca66c9df2a9
> --- /dev/null
> +++ b/drivers/net/pcs/pcs-mtk-usxgmii.c
> @@ -0,0 +1,688 @@
[...]
> +static int mtk_sgmii_wrapper_init(struct mtk_usxgmii_pcs *mpcs)
> +{
> +	struct device_node *r = mpcs->dev->of_node, *np;
[...]
> +	rstc = of_reset_control_get_shared(r, "sgmii");
> +

Superfluous whitespace.

> +	if (IS_ERR(rstc))
> +		return PTR_ERR(rstc);

Here you correctly check rstc for errors ...

[...]
> +	wp->reset = rstc;
[...]
> +
> +	if (IS_ERR(wp->reset))
> +		return PTR_ERR(wp->reset);

And here you check it again. The second check can be dropped.


regards
Philipp