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

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Date:   Mon, 17 Jan 2022 14:50:18 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
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.

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