linux-kernel - Re: [PATCH v3 1/2] dt-bindings: pinctrl: mediatek: add support for mt8196

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Message-ID: <bec17d1e215a11daa1fdede78c8070c8e1763c72.camel@mediatek.com>
Date: Mon, 20 Jan 2025 09:17:43 +0000
From: Cathy Xu (许华婷) <ot_cathy.xu@...iatek.com>
To: "krzk@...nel.org" <krzk@...nel.org>
CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mediatek@...ts.infradead.org" <linux-mediatek@...ts.infradead.org>,
	Lei Xue (薛磊) <Lei.Xue@...iatek.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Wenbin Mei (梅文彬) <Wenbin.Mei@...iatek.com>,
	"linus.walleij@...aro.org" <linus.walleij@...aro.org>,
	Guodong Liu (刘国栋) <Guodong.Liu@...iatek.com>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	"conor+dt@...nel.org" <conor+dt@...nel.org>, "robh@...nel.org"
	<robh@...nel.org>, "sean.wang@...nel.org" <sean.wang@...nel.org>,
	"linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>, "matthias.bgg@...il.com"
	<matthias.bgg@...il.com>, "krzk+dt@...nel.org" <krzk+dt@...nel.org>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
Subject: Re: [PATCH v3 1/2] dt-bindings: pinctrl: mediatek: add support for
 mt8196

On Thu, 2025-01-16 at 11:20 +0100, Krzysztof Kozlowski wrote:
> External email : Please do not click links or open attachments until
> you have verified the sender or the content.
> 
> 
> On 16/01/2025 09:18, Cathy Xu (许华婷) wrote:
> > On Thu, 2025-01-16 at 08:28 +0100, Krzysztof Kozlowski wrote:
> > > External email : Please do not click links or open attachments
> > > until
> > > you have verified the sender or the content.
> > > 
> > > 
> > > On 16/01/2025 03:20, Cathy Xu (许华婷) wrote:
> > > > > > +          bias-pull-down:
> > > > > > +            oneOf:
> > > > > > +              - type: boolean
> > > > > > +              - enum: [100, 101, 102, 103]
> > > > > > +                description: mt8196 pull down PUPD/R0/R1
> > > > > > type
> > > > > > define value.
> > > > > > +              - enum: [200, 201, 202, 203, 204, 205, 206,
> > > > > > 207]
> > > > > > +                description: mt8196 pull down RSEL type
> > > > > > define
> > > > > > value.
> > > > > 
> > > > > Not much improved.
> > > > 
> > > >   I have removed the content related to 'resistance value', we
> > > > use
> > > > 'RSEL' instead of 'resistance value'.
> > > 
> > > So the value in Ohms was removed? I assume above do not have
> > > known
> > > value
> > > in Ohms?
> > 
> >   Yes, value in Ohns was removed, no code have knowm value.
> 
> Does the hardware have known value in Ohms?

  What do you mean by 'hardware'? When writing to the rsel register,
the value written is 0-7.

> 
> 
> > 
> > > 
> > > > 
> > > > > 
> > > > > 
> > > > > > +            description: |
> > > > > > +              For pull down type is normal, it doesn't
> > > > > > need
> > > > > > add
> > > > > > RSEL & R1R0.
> > > > > > +              For pull down type is PUPD/R0/R1 type, it
> > > > > > can
> > > > > > add
> > > > > > R1R0 define to
> > > > > > +              set different resistance. It can support
> > > > > > "MTK_PUPD_SET_R1R0_00" &
> > > > > > +              "MTK_PUPD_SET_R1R0_01" &
> > > > > > "MTK_PUPD_SET_R1R0_10"
> > > > > > &
> > > > > > +              "MTK_PUPD_SET_R1R0_11" define in mt8196.
> > > > > > +              For pull down type is PD/RSEL, it can add
> > > > > > RSEL
> > > > > > define to set
> > > > > > +              different resistance. It can support
> > > > > > +              "MTK_PULL_SET_RSEL_000" &
> > > > > > "MTK_PULL_SET_RSEL_001" &
> > > > > > +              "MTK_PULL_SET_RSEL_010" &
> > > > > > "MTK_PULL_SET_RSEL_011" &
> > > > > > +              "MTK_PULL_SET_RSEL_100" &
> > > > > > "MTK_PULL_SET_RSEL_101" &
> > > > > > +              "MTK_PULL_SET_RSEL_110" &
> > > > > > "MTK_PULL_SET_RSEL_111"
> > > > > > define in
> > > > > > +              mt8196.
> > > > > > diff --git a/include/dt-bindings/pinctrl/mt8196-pinfunc.h
> > > > > > b/include/dt-bindings/pinctrl/mt8196-pinfunc.h
> > > > > > new file mode 100644
> > > > > > index 000000000000..bf0c8374407c
> > > > > > --- /dev/null
> > > > > > +++ b/include/dt-bindings/pinctrl/mt8196-pinfunc.h
> > > > > > @@ -0,0 +1,1572 @@
> > > > > > +/* SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> > > > > > */
> > > > > > +/*
> > > > > > + * Copyright (C) 2025 Mediatek Inc.
> > > > > > + * Author: Guodong Liu <Guodong.Liu@...iatek.com>
> > > > > > + */
> > > > > > +
> > > > > > +#ifndef __MT8196_PINFUNC_H
> > > > > > +#define __MT8196_PINFUNC_H
> > > > > > +
> > > > > > +#include <dt-bindings/pinctrl/mt65xx.h>
> > > > > > +
> > > > > > +#define PINMUX_GPIO0__FUNC_GPIO0 (MTK_PIN_NO(0) | 0)
> > > > > > +#define PINMUX_GPIO0__FUNC_DMIC1_CLK (MTK_PIN_NO(0) | 1)
> > > > > > +#define PINMUX_GPIO0__FUNC_SPI3_A_MO (MTK_PIN_NO(0) | 3)
> > > > > > +#define PINMUX_GPIO0__FUNC_FMI2S_B_LRCK (MTK_PIN_NO(0) |
> > > > > > 4)
> > > > > > +#define PINMUX_GPIO0__FUNC_SCP_DMIC1_CLK (MTK_PIN_NO(0) |
> > > > > > 5)
> > > > > > +#define PINMUX_GPIO0__FUNC_TP_GPIO14_AO (MTK_PIN_NO(0) |
> > > > > > 6)
> > > > > 
> > > > > I do not see how you resolved my comment from v1. In v2 I
> > > > > reminded
> > > > > about
> > > > > it, so you responded that yopu will change something, but I
> > > > > do
> > > > > not
> > > > > see
> > > > > any changes.
> > > > > 
> > > > > So explain: how did you resolve my comment?
> > > > > 
> > > > > These two examples where you claim you will change something,
> > > > > but
> > > > > send
> > > > > the same. I skipped the rest of the patch.
> > > > 
> > > >   Thank you for your patient response, here is my explanation
> > > > for
> > > > you
> > > > question:
> > > > 
> > > >   In v1, I undertand that you meant I didn't sent a real
> > > > binding,
> > > > and
> > > 
> > > 
> > > The comment is under specific lines, so I said these defines are
> > > not
> > > a
> > > real binding. You sent them again, but they are still not
> > > bindings,
> > > because they are not used in the driver. Maybe the usage is
> > > convoluted,
> > > so which part of implementation are these connecting with DTS?
> > > IOW,
> > > which part of driver relies on the binding?
> > 
> >   I got you. This binding define many macros, which will be used
> > for
> > 'pinmux' setting in the DTS. The usage like this:
> > 
> >   adsp_uart_pins: adsp-uart-pins {
> >                 pins-tx-rx {
> >                         pinmux =
> > <PINMUX_GPIO35__FUNC_O_ADSP_UTXD0>,
> >                                  <PINMUX_GPIO36__FUNC_I1_ADSP_URXD0
> > >;
> >                 };
> >         };
> 
> 
> That's DTS, not driver, so not a binding. Drop the header from
> bindings.

  Sorry, I don't quite understand the relationship between binding and
driver. Driver will parse this macro to get gpio number and function.

> 
> 
> Best regards,
> Krzysztof