linux-kernel - Re: [PATCH v2 24/28] pinctrl: Add support for the Lantic PEF2256 pinmux

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Date:   Mon, 7 Aug 2023 15:05:15 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Herve Codina <herve.codina@...tlin.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, Andrew Lunn <andrew@...n.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>, Lee Jones <lee@...nel.org>,
        Qiang Zhao <qiang.zhao@....com>, Li Yang <leoyang.li@....com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Shengjiu Wang <shengjiu.wang@...il.com>,
        Xiubo Li <Xiubo.Lee@...il.com>,
        Fabio Estevam <festevam@...il.com>,
        Nicolin Chen <nicoleotsuka@...il.com>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Randy Dunlap <rdunlap@...radead.org>, netdev@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, alsa-devel@...a-project.org,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH v2 24/28] pinctrl: Add support for the Lantic PEF2256 pinmux

Hi Herve,

thanks for your patch!

First: is this patch something we could merge separately? I don't see
any dependency on the other patches.

On Wed, Jul 26, 2023 at 5:04 PM Herve Codina <herve.codina@...tlin.com> wrote:

> The Lantiq PEF2256 is a framer and line interface component designed to
> fulfill all required interfacing between an analog E1/T1/J1 line and the
> digital PCM system highway/H.100 bus.
>
> This pinmux support handles the pin muxing part (pins RP(A..D) and pins
> XP(A..D)) of the PEF2256.
>
> Signed-off-by: Herve Codina <herve.codina@...tlin.com>

So it is a bridge chip? Please use that terminology since Linux
DRM often talks about bridges.

> +++ b/drivers/pinctrl/pinctrl-pef2256-regs.h
(...)
> +#include "linux/bitfield.h"

Really? I don't think there is such a file there.

Do you mean <linux/bitfield.h> and does this even compile?

> diff --git a/drivers/pinctrl/pinctrl-pef2256.c b/drivers/pinctrl/pinctrl-pef2256.c
(...)
> +struct pef2256_pinctrl {
> +       struct device *dev;
> +       struct regmap *regmap;
> +       enum pef2256_version version;
> +       struct {
> +               struct pinctrl_desc pctrl_desc;
> +               const struct pef2256_function_desc *functions;
> +               unsigned int nfunctions;
> +       } pinctrl;

Uh anonymous struct... can't you just define the struct separately
with a name? Or fold it into struct pef2256_pinctrl without the
additional struct? Thanks.

Otherwise it looks neat!

Yours,
Linus Walleij