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From: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
To: "Sam Protsenko" <semen.protsenko@linaro.org>,
	"Paweł Chmiel" <pawel.mikolaj.chmiel@gmail.com>
Cc: Sylwester Nawrocki <s.nawrocki@samsung.com>,
	Chanwoo Choi <cw00.choi@samsung.com>,
	Linus Walleij <linus.walleij@linaro.org>,
	Tomasz Figa <tomasz.figa@gmail.com>,
	Rob Herring <robh+dt@kernel.org>, Stephen Boyd <sboyd@kernel.org>,
	Michael Turquette <mturquette@baylibre.com>,
	Jiri Slaby <jirislaby@kernel.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Charles Keepax <ckeepax@opensource.wolfsonmicro.com>,
	Ryu Euiyoul <ryu.real@samsung.com>,
	Tom Gall <tom.gall@linaro.org>,
	Sumit Semwal <sumit.semwal@linaro.org>,
	John Stultz <john.stultz@linaro.org>,
	Amit Pundir <amit.pundir@linaro.org>,
	devicetree <devicetree@vger.kernel.org>,
	linux-arm Mailing List <linux-arm-kernel@lists.infradead.org>,
	linux-clk <linux-clk@vger.kernel.org>,
	"open list:GPIO SUBSYSTEM" <linux-gpio@vger.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Linux Samsung SOC <linux-samsung-soc@vger.kernel.org>,
	"open list:SERIAL DRIVERS" <linux-serial@vger.kernel.org>
Subject: Re: [PATCH 12/12] arm64: dts: exynos: Add Exynos850 SoC support
Date: Fri, 6 Aug 2021 14:32:00 +0200	[thread overview]
Message-ID: <b753796c-2ce6-4166-7c20-289e950237ad@canonical.com> (raw)
In-Reply-To: <CAPLW+4n_JKj5xeBHXONcv__vyAFvx3fhXoxJa17NTHK1RSJFJw@mail.gmail.com>

On 06/08/2021 14:07, Sam Protsenko wrote:
> On Fri, 6 Aug 2021 at 10:49, Krzysztof Kozlowski
> <krzysztof.kozlowski@canonical.com> wrote:
>>
>> On 06/08/2021 01:06, Sam Protsenko wrote:
>>> On Sat, 31 Jul 2021 at 12:03, Krzysztof Kozlowski
>>> <krzysztof.kozlowski@canonical.com> wrote:
>>>
>>>>>
>>>>> This patch adds minimal SoC support. Particular board device tree files
>>>>> can include exynos850.dtsi file to get SoC related nodes, and then
>>>>> reference those nodes further as needed.
>>>>>
>>>>> Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
>>>>> ---
>>>>>  .../boot/dts/exynos/exynos850-pinctrl.dtsi    | 782 ++++++++++++++++++
>>>>>  arch/arm64/boot/dts/exynos/exynos850-usi.dtsi |  30 +
>>>>>  arch/arm64/boot/dts/exynos/exynos850.dtsi     | 245 ++++++
>>>>
>>>> Not buildable. Missing Makefile, missing DTS. Please submit with initial
>>>> DTS, otherwise no one is able to verify it even compiles.
>>>>
>>>
>>> This device is not available for purchase yet. I'll send the patch for
>>> board dts once it's announced. I can do all the testing for now, if
>>> you have any specific requests. Would it be possible for us to review
>>> and apply only SoC support for now? Will send v2 soon...
>>
>> What you propose is equal to adding a driver (C source code) without
>> ability to compile it. What's the point of having it in the kernel? It's
>> unverifiable, unbuildable and unusable.
>>
> 
> Yes, I understand. That's adding code with no users, and it's not a
> good practice.
> 
>> We can review the DTSI however merging has to be with a DTS. Usually the
>> SoC vendor adds first an evalkit (e.g. SMDK board). Maybe you have one
>> for Exynos850? Otherwise if you cannot disclose the actual board, the
>> DTSI will have to wait. You can submit drivers, though.
>>
> 
> Sure, let's go this way. I'll send v2 soon. Improving patches and
> having Reviewed-by tag for those would good enough for me at this
> point. I'll continue to prepare another Exynos850 related patches
> until the actual board is announced, like proper clock driver, reset,
> MMC, etc. Is it ok if I send those for a review too (so I can fix all
> issues ahead)?

Sure, prepare all necessary drivers earlier. I suspect clocks will be a
real pain because of significant changes modeled in vendor kernel. I
remember Paweł Chmiel (+Cc) was doing something for these:
https://github.com/PabloPL/linux/tree/exynos7420

I mentioned before - you should also modify the chipid driver. Check
also other drivers in drivers/soc/samsung, although some are needed only
for suspend&resume.

BTW, Paweł,
How is your Exynos7420 progress? :)

> And should I maybe add RFC tag for those?

No need. Drivers can be merged before DTS users.

Best regards,
Krzysztof

WARNING: multiple messages have this Message-ID
From: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
To: "Sam Protsenko" <semen.protsenko@linaro.org>,
	"Paweł Chmiel" <pawel.mikolaj.chmiel@gmail.com>
Cc: Sylwester Nawrocki <s.nawrocki@samsung.com>,
	Chanwoo Choi <cw00.choi@samsung.com>,
	Linus Walleij <linus.walleij@linaro.org>,
	Tomasz Figa <tomasz.figa@gmail.com>,
	Rob Herring <robh+dt@kernel.org>, Stephen Boyd <sboyd@kernel.org>,
	Michael Turquette <mturquette@baylibre.com>,
	Jiri Slaby <jirislaby@kernel.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Charles Keepax <ckeepax@opensource.wolfsonmicro.com>,
	Ryu Euiyoul <ryu.real@samsung.com>,
	Tom Gall <tom.gall@linaro.org>,
	Sumit Semwal <sumit.semwal@linaro.org>,
	John Stultz <john.stultz@linaro.org>,
	Amit Pundir <amit.pundir@linaro.org>,
	devicetree <devicetree@vger.kernel.org>,
	linux-arm Mailing List <linux-arm-kernel@lists.infradead.org>,
	linux-clk <linux-clk@vger.kernel.org>,
	"open list:GPIO SUBSYSTEM" <linux-gpio@vger.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Linux Samsung SOC <linux-samsung-soc@vger.kernel.org>,
	"open list:SERIAL DRIVERS" <linux-serial@vger.kernel.org>
Subject: Re: [PATCH 12/12] arm64: dts: exynos: Add Exynos850 SoC support
Date: Fri, 6 Aug 2021 14:32:00 +0200	[thread overview]
Message-ID: <b753796c-2ce6-4166-7c20-289e950237ad@canonical.com> (raw)
In-Reply-To: <CAPLW+4n_JKj5xeBHXONcv__vyAFvx3fhXoxJa17NTHK1RSJFJw@mail.gmail.com>

On 06/08/2021 14:07, Sam Protsenko wrote:
> On Fri, 6 Aug 2021 at 10:49, Krzysztof Kozlowski
> <krzysztof.kozlowski@canonical.com> wrote:
>>
>> On 06/08/2021 01:06, Sam Protsenko wrote:
>>> On Sat, 31 Jul 2021 at 12:03, Krzysztof Kozlowski
>>> <krzysztof.kozlowski@canonical.com> wrote:
>>>
>>>>>
>>>>> This patch adds minimal SoC support. Particular board device tree files
>>>>> can include exynos850.dtsi file to get SoC related nodes, and then
>>>>> reference those nodes further as needed.
>>>>>
>>>>> Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
>>>>> ---
>>>>>  .../boot/dts/exynos/exynos850-pinctrl.dtsi    | 782 ++++++++++++++++++
>>>>>  arch/arm64/boot/dts/exynos/exynos850-usi.dtsi |  30 +
>>>>>  arch/arm64/boot/dts/exynos/exynos850.dtsi     | 245 ++++++
>>>>
>>>> Not buildable. Missing Makefile, missing DTS. Please submit with initial
>>>> DTS, otherwise no one is able to verify it even compiles.
>>>>
>>>
>>> This device is not available for purchase yet. I'll send the patch for
>>> board dts once it's announced. I can do all the testing for now, if
>>> you have any specific requests. Would it be possible for us to review
>>> and apply only SoC support for now? Will send v2 soon...
>>
>> What you propose is equal to adding a driver (C source code) without
>> ability to compile it. What's the point of having it in the kernel? It's
>> unverifiable, unbuildable and unusable.
>>
> 
> Yes, I understand. That's adding code with no users, and it's not a
> good practice.
> 
>> We can review the DTSI however merging has to be with a DTS. Usually the
>> SoC vendor adds first an evalkit (e.g. SMDK board). Maybe you have one
>> for Exynos850? Otherwise if you cannot disclose the actual board, the
>> DTSI will have to wait. You can submit drivers, though.
>>
> 
> Sure, let's go this way. I'll send v2 soon. Improving patches and
> having Reviewed-by tag for those would good enough for me at this
> point. I'll continue to prepare another Exynos850 related patches
> until the actual board is announced, like proper clock driver, reset,
> MMC, etc. Is it ok if I send those for a review too (so I can fix all
> issues ahead)?

Sure, prepare all necessary drivers earlier. I suspect clocks will be a
real pain because of significant changes modeled in vendor kernel. I
remember Paweł Chmiel (+Cc) was doing something for these:
https://github.com/PabloPL/linux/tree/exynos7420

I mentioned before - you should also modify the chipid driver. Check
also other drivers in drivers/soc/samsung, although some are needed only
for suspend&resume.

BTW, Paweł,
How is your Exynos7420 progress? :)

> And should I maybe add RFC tag for those?

No need. Drivers can be merged before DTS users.

Best regards,
Krzysztof

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

  reply	other threads:[~2021-08-06 12:32 UTC|newest]

Thread overview: 132+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-30 14:49 [PATCH 00/12] Add minimal support for Exynos850 SoC Sam Protsenko
2021-07-30 14:49 ` Sam Protsenko
2021-07-30 14:49 ` [PATCH 01/12] pinctrl: samsung: Fix pinctrl bank pin count Sam Protsenko
2021-07-30 14:49   ` Sam Protsenko
2021-07-30 14:49 ` [PATCH 02/12] pinctrl: samsung: Add Exynos850 SoC specific data Sam Protsenko
2021-07-30 14:49   ` Sam Protsenko
2021-07-30 15:22   ` Krzysztof Kozlowski
2021-07-30 15:22     ` Krzysztof Kozlowski
2021-08-02 19:24     ` Sam Protsenko
2021-08-02 19:24       ` Sam Protsenko
2021-07-30 14:49 ` [PATCH 03/12] dt-bindings: pinctrl: samsung: Add Exynos850 doc Sam Protsenko
2021-07-30 14:49   ` Sam Protsenko
2021-07-30 15:24   ` Krzysztof Kozlowski
2021-07-30 15:24     ` Krzysztof Kozlowski
2021-07-30 19:31     ` Sam Protsenko
2021-07-30 19:31       ` Sam Protsenko
2021-07-30 14:49 ` [PATCH 04/12] tty: serial: samsung: Init USI to keep clocks running Sam Protsenko
2021-07-30 14:49   ` Sam Protsenko
2021-07-30 16:31   ` Krzysztof Kozlowski
2021-07-30 16:31     ` Krzysztof Kozlowski
2021-08-02 23:06     ` Sam Protsenko
2021-08-02 23:06       ` Sam Protsenko
2021-08-03  7:37       ` Krzysztof Kozlowski
2021-08-03  7:37         ` Krzysztof Kozlowski
2021-08-03 11:41         ` Sam Protsenko
2021-08-03 11:41           ` Sam Protsenko
2021-07-30 14:49 ` [PATCH 05/12] tty: serial: samsung: Fix driver data macros style Sam Protsenko
2021-07-30 14:49   ` Sam Protsenko
2021-07-30 16:34   ` Krzysztof Kozlowski
2021-07-30 16:34     ` Krzysztof Kozlowski
2021-07-30 14:49 ` [PATCH 06/12] tty: serial: samsung: Add Exynos850 SoC data Sam Protsenko
2021-07-30 14:49   ` Sam Protsenko
2021-07-30 15:05   ` Andy Shevchenko
2021-07-30 15:05     ` Andy Shevchenko
2021-07-30 16:05   ` Krzysztof Kozlowski
2021-07-30 16:05     ` Krzysztof Kozlowski
2021-07-30 23:10     ` Sam Protsenko
2021-07-30 23:10       ` Sam Protsenko
2021-07-31  7:12       ` Krzysztof Kozlowski
2021-07-31  7:12         ` Krzysztof Kozlowski
2021-07-30 14:49 ` [PATCH 07/12] dt-bindings: serial: samsung: Add Exynos850 doc Sam Protsenko
2021-07-30 14:49   ` Sam Protsenko
2021-07-30 16:35   ` Krzysztof Kozlowski
2021-07-30 16:35     ` Krzysztof Kozlowski
2021-07-30 19:04     ` Sam Protsenko
2021-07-30 19:04       ` Sam Protsenko
2021-07-30 14:49 ` [PATCH 08/12] MAINTAINERS: Cover Samsung clock YAML bindings Sam Protsenko
2021-07-30 14:49   ` Sam Protsenko
2021-07-30 15:06   ` Andy Shevchenko
2021-07-30 15:06     ` Andy Shevchenko
2021-07-30 15:25     ` Krzysztof Kozlowski
2021-07-30 15:25       ` Krzysztof Kozlowski
2021-07-30 17:32       ` Sam Protsenko
2021-07-30 17:32         ` Sam Protsenko
2021-07-30 14:49 ` [PATCH 09/12] dt-bindings: clock: Add bindings for Exynos850 clock controller Sam Protsenko
2021-07-30 14:49   ` Sam Protsenko
2021-07-30 15:43   ` Krzysztof Kozlowski
2021-07-30 15:43     ` Krzysztof Kozlowski
2021-08-03 11:55     ` Sam Protsenko
2021-08-03 11:55       ` Sam Protsenko
2021-07-30 22:28   ` Rob Herring
2021-07-30 22:28     ` Rob Herring
2021-07-30 14:49 ` [PATCH 10/12] clk: samsung: Add Exynos850 clock driver stub Sam Protsenko
2021-07-30 14:49   ` Sam Protsenko
2021-07-30 15:11   ` Andy Shevchenko
2021-07-30 15:11     ` Andy Shevchenko
2021-07-30 17:24     ` Sam Protsenko
2021-07-30 17:24       ` Sam Protsenko
2021-07-30 14:49 ` [PATCH 11/12] dt-bindings: interrupt-controller: Add IRQ constants for Exynos850 Sam Protsenko
2021-07-30 14:49   ` Sam Protsenko
2021-07-31  8:45   ` Krzysztof Kozlowski
2021-07-31  8:45     ` Krzysztof Kozlowski
2021-08-03 12:58     ` Sam Protsenko
2021-08-03 12:58       ` Sam Protsenko
2021-07-30 14:49 ` [PATCH 12/12] arm64: dts: exynos: Add Exynos850 SoC support Sam Protsenko
2021-07-30 14:49   ` Sam Protsenko
2021-07-30 16:50   ` Marc Zyngier
2021-07-30 16:50     ` Marc Zyngier
2021-08-04 14:39     ` Sam Protsenko
2021-08-04 14:39       ` Sam Protsenko
2021-08-04 15:01       ` Marc Zyngier
2021-08-04 15:01         ` Marc Zyngier
2021-08-04 18:37         ` Sam Protsenko
2021-08-04 18:37           ` Sam Protsenko
2021-08-05  7:39           ` Marc Zyngier
2021-08-05  7:39             ` Marc Zyngier
2021-08-05 15:30             ` Sam Protsenko
2021-08-05 15:30               ` Sam Protsenko
2021-08-05 15:50               ` Marc Zyngier
2021-08-05 15:50                 ` Marc Zyngier
2021-08-04 18:36       ` Krzysztof Kozlowski
2021-08-04 18:36         ` Krzysztof Kozlowski
2021-08-04 21:30         ` Sam Protsenko
2021-08-04 21:30           ` Sam Protsenko
2021-08-05  7:17           ` Krzysztof Kozlowski
2021-08-05  7:17             ` Krzysztof Kozlowski
2021-08-05  7:30             ` Marc Zyngier
2021-08-05  7:30               ` Marc Zyngier
2021-08-05  7:35               ` Krzysztof Kozlowski
2021-08-05  7:35                 ` Krzysztof Kozlowski
2021-07-31  9:03   ` Krzysztof Kozlowski
2021-07-31  9:03     ` Krzysztof Kozlowski
2021-08-05 23:06     ` Sam Protsenko
2021-08-05 23:06       ` Sam Protsenko
2021-08-06  7:48       ` Krzysztof Kozlowski
2021-08-06  7:48         ` Krzysztof Kozlowski
2021-08-06 12:07         ` Sam Protsenko
2021-08-06 12:07           ` Sam Protsenko
2021-08-06 12:32           ` Krzysztof Kozlowski [this message]
2021-08-06 12:32             ` Krzysztof Kozlowski
2021-08-06 12:48             ` Krzysztof Kozlowski
2021-08-06 12:48               ` Krzysztof Kozlowski
2021-08-06 16:57               ` Sam Protsenko
2021-08-06 16:57                 ` Sam Protsenko
2021-08-06 20:32             ` Paweł Chmiel
2021-08-06 20:32               ` Paweł Chmiel
2021-09-06 15:16               ` Sam Protsenko
2021-09-06 15:16                 ` Sam Protsenko
2021-07-30 15:18 ` [PATCH 00/12] Add minimal support for Exynos850 SoC Krzysztof Kozlowski
2021-07-30 15:18   ` Krzysztof Kozlowski
2021-07-30 17:21   ` Krzysztof Kozlowski
2021-07-30 17:21     ` Krzysztof Kozlowski
2021-07-30 19:02     ` Sam Protsenko
2021-07-30 19:02       ` Sam Protsenko
2021-07-31  7:29       ` Krzysztof Kozlowski
2021-07-31  7:29         ` Krzysztof Kozlowski
2021-07-31  8:12         ` Krzysztof Kozlowski
2021-07-31  8:12           ` Krzysztof Kozlowski
2021-08-02 23:27           ` Sam Protsenko
2021-08-02 23:27             ` Sam Protsenko
2021-08-03  7:41             ` Krzysztof Kozlowski
2021-08-03  7:41               ` Krzysztof Kozlowski

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