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Date: Tue, 6 Sep 2022 00:52:48 +0900
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Subject: Re: [PATCH 5/6] gpio: Add new gpio-macsmc driver for Apple Macs
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To: "Russell King (Oracle)" <linux@armlinux.org.uk>,
 Andy Shevchenko <andy.shevchenko@gmail.com>
Cc: Arnd Bergmann <arnd@arndb.de>, Lee Jones <lee@kernel.org>,
 Linus Walleij <linus.walleij@linaro.org>,
 Alyssa Rosenzweig <alyssa@rosenzweig.io>, asahi@lists.linux.dev,
 Bartosz Golaszewski <brgl@bgdev.pl>,
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 "open list:GPIO SUBSYSTEM" <linux-gpio@vger.kernel.org>,
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From: Hector Martin <marcan@marcan.st>
In-Reply-To: <YxYBJcRGCOlcSZH8@shell.armlinux.org.uk>
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On 05/09/2022 23.01, Russell King (Oracle) wrote:
> On Mon, Sep 05, 2022 at 04:16:27PM +0300, Andy Shevchenko wrote:
>> P.S. Do you have a platform to test all these?
> 
> Yes, but that doesn't mean I can do testing sufficient to ensure that
> the modifications are correct. As I understand things, the SMC is not
> limited to just aarch64 hardware.

FWIW, the RTKit backend is limited to aarch64 hardware, and that's also
why I kept all the endian-munging there. T2 and legacy x86 backends
(which don't exist yet, so whether things need changing for those
platforms is an open question anyway) would respectively do whatever
endian-munging is appropriate for them.

So at this point, only Apple Mx AArch64 SoCs matter, though I *tried* to
write the code in the way that I thought was most likely to cleanly
transfer over to other SMC platforms by just changing the backend code.

- Hector