linux-kernel - Re: [PATCH v2 00/12] arm64: Kconfig: Update ARCH

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Message-ID: <8729f109-93c1-24dc-f7d9-9c83d7ac24dc@canonical.com>
Date:   Thu, 30 Sep 2021 14:15:03 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
To:     Tomasz Figa <tomasz.figa@...il.com>,
        Lee Jones <lee.jones@...aro.org>
Cc:     Will McVicker <willmcvicker@...gle.com>,
        Russell King <linux@...linux.org.uk>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Sylwester Nawrocki <s.nawrocki@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Alessandro Zummo <a.zummo@...ertech.it>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        John Stultz <john.stultz@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Saravana Kannan <saravanak@...gle.com>,
        "Cc: Android Kernel" <kernel-team@...roid.com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-samsung-soc <linux-samsung-soc@...r.kernel.org>,
        linux-clk <linux-clk@...r.kernel.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        linux-rtc@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
        Olof Johansson <olof@...om.net>
Subject: Re: [PATCH v2 00/12] arm64: Kconfig: Update ARCH_EXYNOS select
 configs

On 30/09/2021 14:10, Tomasz Figa wrote:
> 2021年9月30日(木) 20:51 Lee Jones <lee.jones@...aro.org>:
>>
>> On Thu, 30 Sep 2021, Tomasz Figa wrote:
>>
>>
>> Is that the same as exporting symbols to framework APIs?
>>
>> Since this is already a method GKI uses to allow external modules to
>> interact with the core kernel/frameworks.  However, it's not possible
>> to upstream these without an upstream user for each one.
> 
> Not necessary the core frameworks, could also be changing the ways the
> existing drivers register to allow additional drivers to extend the
> functionality rather than completely overwrite them. 

Yes, the first user could be within the kernel after modifying some of
the drivers.

> It's really hard
> to tell what the right way would be without knowing the exact things
> they find missing in the upstream drivers. As for upstream users, this
> is exactly the point - upstream is a bidirectional effort, one takes
> from it and should contribute things back.
> 
> Generally, the subsystems being mentioned here are so basic (clock,
> pinctrl, rtc), that I really can't imagine what kind of rocket science
> one might want to hide for competitive reasons... If it's for an
> entire SoC, I wonder why Intel and AMD don't have similar concerns and
> contribute support for their newest hardware far before the release.

Lee used the argument of not-disclosing-edge-hw but I also don't see
much of it in the case of few drivers needed to be overridden. Just
bunch of registers for the same stuff we have sine 8 years. Rather the
vendor does not want to commit effort towards upstreaming these...


Best regards,
Krzysztof