linux-kernel - Re: [PATCH v2 2/9] pinctrl: renesas: rzg2l: Clean up and refactor OEN read/write functions

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Date: Tue, 25 Jun 2024 20:56:24 +0100
From: Paul Barker <paul.barker.ct@...renesas.com>
To: Geert Uytterhoeven <geert@...ux-m68k.org>
Cc: Magnus Damm <magnus.damm@...il.com>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Linus Walleij <linus.walleij@...aro.org>,
 Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
 linux-renesas-soc@...r.kernel.org, devicetree@...r.kernel.org,
 linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/9] pinctrl: renesas: rzg2l: Clean up and refactor OEN
 read/write functions

On 17/06/2024 13:02, Geert Uytterhoeven wrote:
> Hi Paul,
> 
> On Tue, Jun 11, 2024 at 1:33 PM Paul Barker
> <paul.barker.ct@...renesas.com> wrote:
>> -static u8 rzg3s_pin_to_oen_bit(u32 offset, u8 pin, u8 max_port)
>> +static u32 rzg3s_read_oen(struct rzg2l_pinctrl *pctrl, u32 caps, unsigned int _pin)
>>  {
>> -       if (pin)
>> -               pin *= 2;
>> +       u32 port = RZG2L_PIN_ID_TO_PORT(_pin);
>> +       u8 pin = RZG2L_PIN_ID_TO_PIN(_pin);
> 
> It's OK to use RZG2L_PIN_ID_TO_PIN() unconditionally, as RZ/G3S does
> not have any dedicated pins with the OEN capability, right?

I thought about this a bit and came to the conclusion that no, it's not
ok.

For RZ/G2L, only mux'd pins have OEN capability (Ethernet TXC/TX_CLK
only).

For RZ/G3S, OEN capability also exists on XSPI/OCTA pins which are
dedicated pins. We don't currently support OEN for these pins in the
driver, but we should put a check in place now to be safe. I've done
this in v3 which I'm about to send...

Thanks,

-- 
Paul Barker
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