linux-kernel - RE: [PATCH 15/23] arm64: dts: fsd: Add initial pinctrl support

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Date:   Tue, 18 Jan 2022 20:28:37 +0530
From:   "Alim Akhtar" <alim.akhtar@...sung.com>
To:     "'Krzysztof Kozlowski'" <krzysztof.kozlowski@...onical.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Cc:     <soc@...nel.org>, <linux-clk@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <olof@...om.net>,
        <linus.walleij@...aro.org>, <catalin.marinas@....com>,
        <robh+dt@...nel.org>, <s.nawrocki@...sung.com>,
        <linux-samsung-soc@...r.kernel.org>, <pankaj.dubey@...sung.com>,
        <linux-fsd@...la.com>,
        "'Shashank Prashar'" <s.prashar@...sung.com>,
        "'Aswani Reddy'" <aswani.reddy@...sung.com>
Subject: RE: [PATCH 15/23] arm64: dts: fsd: Add initial pinctrl support



>-----Original Message-----
>From: Krzysztof Kozlowski [mailto:krzysztof.kozlowski@...onical.com]
>Sent: Monday, January 17, 2022 7:20 PM
>To: Alim Akhtar <alim.akhtar@...sung.com>; linux-arm-
>kernel@...ts.infradead.org; linux-kernel@...r.kernel.org
>Cc: soc@...nel.org; linux-clk@...r.kernel.org; devicetree@...r.kernel.org;
>olof@...om.net; linus.walleij@...aro.org; catalin.marinas@....com;
>robh+dt@...nel.org; s.nawrocki@...sung.com; linux-samsung-
>soc@...r.kernel.org; pankaj.dubey@...sung.com; linux-fsd@...la.com;
>'Shashank Prashar' <s.prashar@...sung.com>; 'Aswani Reddy'
><aswani.reddy@...sung.com>
>Subject: Re: [PATCH 15/23] arm64: dts: fsd: Add initial pinctrl support
>
>On 17/01/2022 14:44, Alim Akhtar wrote:
>> Hi Krzysztof
>>
>>> -----Original Message-----
>>> From: Krzysztof Kozlowski [mailto:krzysztof.kozlowski@...onical.com]
>>> Sent: Thursday, January 13, 2022 6:50 PM
>>> To: Alim Akhtar <alim.akhtar@...sung.com>; linux-arm-
>>> kernel@...ts.infradead.org; linux-kernel@...r.kernel.org
>>> Cc: soc@...nel.org; linux-clk@...r.kernel.org;
>>> devicetree@...r.kernel.org; olof@...om.net; linus.walleij@...aro.org;
>>> catalin.marinas@....com;
>>> robh+dt@...nel.org; s.nawrocki@...sung.com; linux-samsung-
>>> soc@...r.kernel.org; pankaj.dubey@...sung.com; linux-fsd@...la.com;
>>> Shashank Prashar <s.prashar@...sung.com>; Aswani Reddy
>>> <aswani.reddy@...sung.com>
>>> Subject: Re: [PATCH 15/23] arm64: dts: fsd: Add initial pinctrl
>>> support
>>>
>>> On 13/01/2022 13:11, Alim Akhtar wrote:
>>>> Add initial pin configuration nodes for FSD SoC.
>>>>
>>>> Cc: linux-fsd@...la.com
>>>> Signed-off-by: Shashank Prashar <s.prashar@...sung.com>
>>>> Signed-off-by: Aswani Reddy <aswani.reddy@...sung.com>
>>>> Signed-off-by: Alim Akhtar <alim.akhtar@...sung.com>
>>>> ---
>>>>  arch/arm64/boot/dts/tesla/fsd-pinctrl.dtsi | 338
>>> +++++++++++++++++++++
>>>>  arch/arm64/boot/dts/tesla/fsd.dtsi         |  22 ++
>>>>  2 files changed, 360 insertions(+)
>>>>  create mode 100644 arch/arm64/boot/dts/tesla/fsd-pinctrl.dtsi
>>>>
>>>> diff --git a/arch/arm64/boot/dts/tesla/fsd-pinctrl.dtsi
>>>> b/arch/arm64/boot/dts/tesla/fsd-pinctrl.dtsi
>>>> new file mode 100644
>>>> index 000000000000..ec8d944af636
>>>> --- /dev/null
>>>> +++ b/arch/arm64/boot/dts/tesla/fsd-pinctrl.dtsi
>>>> @@ -0,0 +1,338 @@
>>>> +// SPDX-License-Identifier: GPL-2.0
>>>> +/*
>>>> + * Tesla Full Self-Driving SoC device tree source
>>>> + *
>>>> + * Copyright (c) 2017-2021 Samsung Electronics Co., Ltd.
>>>> + *		https://www.samsung.com
>>>> + * Copyright (c) 2017-2021 Tesla, Inc.
>>>> + *		https://www.tesla.com
>>>> + */
>>>> +
>>>> +#include <dt-bindings/pinctrl/samsung.h>
>>>> +
>>>> +&pinctrl_fsys0 {
>>>> +
>>>
>>> No need for empty line.
>>>
>> Noted
>>
>>>> +	gpf0: gpf0 {
>>>
>>> FYI:
>>> It's ok now, but the nodes will have to be renamed to "xxx-gpio-bank"
>later.
>>>
>> Have rebased my v2 on your pinmux schema update, so these and below
>comments are addressed.
>> Thanks
>>
>
>OK, but have in mind that -gpio-bank suffix is not needed now. This depends
>on support in the pinctrl driver, which will be applied after the merge window
>to different tree or branches than DTS is going to.
>Therefore if I apply your DTS with "-gpio-bank" to my next/dt64, the kernel
>won't find GPIo banks and won't properly boot. The linux-next will be fine,
>just my next/dt64 won't be.
>
Thanks, got it, for now let me send v2 on linux-next (as of today).
As required I will rebase to your next/dt64 and send again.
Which also means that my v2 will not be based on your new pinmux schema.
Probably we will move to that after the merge window.

>If you're fine with it - use "-gpio-bank" suffix. If you prefer my
>next/dt64 to have a fully working Tesla SoC DTS, then stick to old node naming
>and let's replace it later.
>
>Best regards,
>Krzysztof