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Subject: Re: [PATCH v4 05/15] pinctrl: add a pincontrol driver for BCM6328
From:   =?utf-8?Q?=C3=81lvaro_Fern=C3=A1ndez_Rojas?= <noltari@gmail.com>
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Date:   Thu, 4 Mar 2021 16:33:03 +0100
Cc:     Linus Walleij <linus.walleij@linaro.org>,
        Rob Herring <robh+dt@kernel.org>,
        Michael Walle <michael@walle.cc>,
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        Florian Fainelli <f.fainelli@gmail.com>,
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        Necip Fazil Yildiran <fazilyildiran@gmail.com>,
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To:     Andy Shevchenko <andy.shevchenko@gmail.com>
Precedence: bulk

Hi Andy,

> El 4 mar 2021, a las 16:25, Andy Shevchenko =
<andy.shevchenko@gmail.com> escribi=C3=B3:
>=20
> On Thu, Mar 4, 2021 at 2:25 PM =C3=81lvaro Fern=C3=A1ndez Rojas =
<noltari@gmail.com> wrote:
>>> El 4 mar 2021, a las 13:12, Andy Shevchenko =
<andy.shevchenko@gmail.com> escribi=C3=B3:
>>> On Thu, Mar 4, 2021 at 1:13 PM =C3=81lvaro Fern=C3=A1ndez Rojas =
<noltari@gmail.com> wrote:
>>>>> El 4 mar 2021, a las 11:49, Andy Shevchenko =
<andy.shevchenko@gmail.com> escribi=C3=B3:
>>>>> On Thu, Mar 4, 2021 at 10:57 AM =C3=81lvaro Fern=C3=A1ndez Rojas
>>>>> <noltari@gmail.com> wrote:
>=20
> ...
>=20
>>>>>> +               BCM6328_MUX_LO_REG,
>>>>>> +               BCM6328_MUX_HI_REG,
>>>>>=20
>>>>>> +               BCM6328_MUX_OTHER_REG
>>>>>=20
>>>>> When it's not terminator add a comma, otherwise remove a comma.
>>>=20
>>>> =E2=80=A6 so you want me to add a comma or not?
>>>=20
>>> Hmm... you tell me! If this is a list which covers all possible =
cases
>>> _and_ the last one is the kinda maximum value (aka terminator), then
>>> comma is not needed, otherwise add it (to me feels like the latter
>>> should be done here).
>>=20
>> Well=E2=80=A6 Then it shouldn=E2=80=99t be needed, since this is a =
list which covers all possible cases and the last one is a terminator.
>=20
> Honestly the name suggests otherwise. And looking into the code there
> is no guarantee you won't split that _OTHER_ area to something with
> new compatible hardware.

Every BCM63XX device has its own specific pin controllers.
It seems that on every new SoC created by Broadcom they decided that the =
previous pin controller approach was a bad decision or something xD.
Therefore I don=E2=80=99t think there will be such =E2=80=9Cnew =
compatible hardware=E2=80=9D...

> Renaming to BCM6328_MUX_MAX_REG will clear that this is terminator,
> but it means its value shouldn't be used except as to understand the
> amount of supported registers of this enumerator.

No, I don=E2=80=99t think this is a good idea.
Please, take a look at:
=
https://github.com/jameshilliard/gfiber-gflt100/blob/b292e8c271addbda62104=
bece90e3c8018714194/shared/opensource/include/bcm963xx/6328_map_part.h#L41=
0-L441
As you can see, BCM6328_MUX_LO_REG and BCM6328_MUX_HI_REG are used for =
specific GPIOs, but BCM6328_MUX_OTHER_REG is used for pins which lack a =
direct GPIO assignment.

>=20
>=20
> --=20
> With Best Regards,
> Andy Shevchenko

Best regards,
=C3=81lvaro.=