netdev - Re: [RFC PATCH 6/8] net: pcs: add driver for MediaTek USXGMII PCS

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Date: Mon, 27 Nov 2023 14:25:12 +0100
From: Philipp Zabel <p.zabel@...gutronix.de>
To: Daniel Golle <daniel@...rotopia.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>,
 Chunfeng Yun <chunfeng.yun@...iatek.com>, Vinod Koul <vkoul@...nel.org>, 
 Kishon Vijay Abraham I <kishon@...nel.org>, Felix Fietkau <nbd@....name>,
 John Crispin <john@...ozen.org>,  Sean Wang <sean.wang@...iatek.com>, Mark
 Lee <Mark-MC.Lee@...iatek.com>, Lorenzo Bianconi <lorenzo@...nel.org>,
 Matthias Brugger <matthias.bgg@...il.com>,  AngeloGioacchino Del Regno
 <angelogioacchino.delregno@...labora.com>, Andrew Lunn <andrew@...n.ch>,
 Heiner Kallweit <hkallweit1@...il.com>,  Russell King
 <linux@...linux.org.uk>, Alexander Couzens <lynxis@...0.eu>,
 netdev@...r.kernel.org,  devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org,  linux-arm-kernel@...ts.infradead.org,
 linux-mediatek@...ts.infradead.org,  linux-phy@...ts.infradead.org
Subject: Re: [RFC PATCH 6/8] net: pcs: add driver for MediaTek USXGMII PCS

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@...rotopia.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