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From: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
To: Sam Protsenko <semen.protsenko@linaro.org>
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 00/12] Add minimal support for Exynos850 SoC
Date: Sat, 31 Jul 2021 10:12:47 +0200	[thread overview]
Message-ID: <2dacc205-04ce-c206-a393-50ba0d5aa1a7@canonical.com> (raw)
In-Reply-To: <13f166bb-7103-25d5-35a6-8ec53a1f1817@canonical.com>

On 31/07/2021 09:29, Krzysztof Kozlowski wrote:
> On 30/07/2021 21:02, Sam Protsenko wrote:
>> Hi Krzysztof,
>>
>> On Fri, 30 Jul 2021 at 20:21, Krzysztof Kozlowski
>> <krzysztof.kozlowski@canonical.com> wrote:
>>>
>>> On 30/07/2021 17:18, Krzysztof Kozlowski wrote:
>>>> On 30/07/2021 16:49, Sam Protsenko wrote:
>>>>> This patch series adds initial platform support for Samsung Exynos850
>>>>> SoC [1]. With this patchset it's possible to run the kernel with BusyBox
>>>>> rootfs as a RAM disk. More advanced platform support (like MMC driver
>>>>> additions) will be added later. The idea is to keep the first submission
>>>>> minimal to ease the review, and then build up on top of that.
>>>>>
>>>>> [1] https://www.samsung.com/semiconductor/minisite/exynos/products/mobileprocessor/exynos-850/
>>>>>
>>>>
>>>> Great work!
>>>>
>>
>> Thanks, Krzysztof! And thank you for reviewing the whole series.
>>
>>>> What's the SoC revision number (should be accessible via
>>>> /sys/bus/soc/devices/soc0/)? Recent wrap in numbering of Exynos chips
>>>> might bring confusion...
>>
>> # cat /sys/devices/soc0/revision
>> 0
> 
> soc_id but you're right it won't be set for unknown SoCs. You need to
> extend drivers/soc/samsung/exynos-chipid.c to parse new values (E3830000
> for product ID) and maybe new register offsets (previous offset is 0x0,
> for 3830 is 0x10 I think). Also revision mask might change.
> 
>>> Judging by vendor's sources it is quite confusing. It looks mostly like
>>> Exynos3830 but in few other cases it uses Exynos9 compatibles (Exynos9,
>>> Exynos9820). Only in few places there is Exynos850. Marketing department
>>> made it so confusing...  The revision embedded in SoC would be very
>>> interesting.
>>>
>>
>> As I understand, this SoC is called Exynos850 everywhere now.
>> Exynos3830 is its old name, not used anymore. As you noticed from
>> patch #2, it shares some definitions with Exynos9 SoC, so I guess some
>> software is similar for both architectures. Not sure about hardware
>> though, never worked with Exynos9 CPUs. Anyway, I asked Samsung
>> representatives about naming, and it seems like we should stick to
>> "Exynos850" name, even in code.
> 
> 
> Since the chip identifies itself as E3830000, I would prefer naming
> matching real product ID instead of what is pushed by marketing or sales
> representatives. The marketing names don't have to follow any
> engineering rules, they can be changed and renamed. Sales follows rather
> money and corporate rules, not consistency for upstream project.

On the other hand we have already two exceptions for naming
inconsistency - Exynos3250 identifies itself as 3472 (which is confusing
because 3250 is two core and there is a separate quad-core
Exyons3472...) and Exynos5800 is actually marketing name for a revision
of Exynos5422. Maybe indeed will be easier to go with the branded name
850...


Best regards,
Krzysztof

WARNING: multiple messages have this Message-ID
From: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
To: Sam Protsenko <semen.protsenko@linaro.org>
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 00/12] Add minimal support for Exynos850 SoC
Date: Sat, 31 Jul 2021 10:12:47 +0200	[thread overview]
Message-ID: <2dacc205-04ce-c206-a393-50ba0d5aa1a7@canonical.com> (raw)
In-Reply-To: <13f166bb-7103-25d5-35a6-8ec53a1f1817@canonical.com>

On 31/07/2021 09:29, Krzysztof Kozlowski wrote:
> On 30/07/2021 21:02, Sam Protsenko wrote:
>> Hi Krzysztof,
>>
>> On Fri, 30 Jul 2021 at 20:21, Krzysztof Kozlowski
>> <krzysztof.kozlowski@canonical.com> wrote:
>>>
>>> On 30/07/2021 17:18, Krzysztof Kozlowski wrote:
>>>> On 30/07/2021 16:49, Sam Protsenko wrote:
>>>>> This patch series adds initial platform support for Samsung Exynos850
>>>>> SoC [1]. With this patchset it's possible to run the kernel with BusyBox
>>>>> rootfs as a RAM disk. More advanced platform support (like MMC driver
>>>>> additions) will be added later. The idea is to keep the first submission
>>>>> minimal to ease the review, and then build up on top of that.
>>>>>
>>>>> [1] https://www.samsung.com/semiconductor/minisite/exynos/products/mobileprocessor/exynos-850/
>>>>>
>>>>
>>>> Great work!
>>>>
>>
>> Thanks, Krzysztof! And thank you for reviewing the whole series.
>>
>>>> What's the SoC revision number (should be accessible via
>>>> /sys/bus/soc/devices/soc0/)? Recent wrap in numbering of Exynos chips
>>>> might bring confusion...
>>
>> # cat /sys/devices/soc0/revision
>> 0
> 
> soc_id but you're right it won't be set for unknown SoCs. You need to
> extend drivers/soc/samsung/exynos-chipid.c to parse new values (E3830000
> for product ID) and maybe new register offsets (previous offset is 0x0,
> for 3830 is 0x10 I think). Also revision mask might change.
> 
>>> Judging by vendor's sources it is quite confusing. It looks mostly like
>>> Exynos3830 but in few other cases it uses Exynos9 compatibles (Exynos9,
>>> Exynos9820). Only in few places there is Exynos850. Marketing department
>>> made it so confusing...  The revision embedded in SoC would be very
>>> interesting.
>>>
>>
>> As I understand, this SoC is called Exynos850 everywhere now.
>> Exynos3830 is its old name, not used anymore. As you noticed from
>> patch #2, it shares some definitions with Exynos9 SoC, so I guess some
>> software is similar for both architectures. Not sure about hardware
>> though, never worked with Exynos9 CPUs. Anyway, I asked Samsung
>> representatives about naming, and it seems like we should stick to
>> "Exynos850" name, even in code.
> 
> 
> Since the chip identifies itself as E3830000, I would prefer naming
> matching real product ID instead of what is pushed by marketing or sales
> representatives. The marketing names don't have to follow any
> engineering rules, they can be changed and renamed. Sales follows rather
> money and corporate rules, not consistency for upstream project.

On the other hand we have already two exceptions for naming
inconsistency - Exynos3250 identifies itself as 3472 (which is confusing
because 3250 is two core and there is a separate quad-core
Exyons3472...) and Exynos5800 is actually marketing name for a revision
of Exynos5422. Maybe indeed will be easier to go with the branded name
850...


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:[~2021-07-31  8:12 UTC|newest]

Thread overview: 132+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-30 14:49 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
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 [this message]
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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