linux-kernel - Re: [PATCH v4 0/3] Add AMBA bus probing support to ACPI

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Date:	Sun, 03 Jan 2016 01:39:22 +0100
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Aleksey Makarov <aleksey.makarov@...aro.org>
Cc:	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-serial@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Graeme Gregory <graeme.gregory@...aro.org>,
	Russell King <linux@....linux.org.uk>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Shannon Zhao <shannon.zhao@...aro.org>,
	Andy Shevchenko <andy.shevchenko@...il.com>,
	Vladimir Zapolskiy <vz@...ia.com>
Subject: Re: [PATCH v4 0/3] Add AMBA bus probing support to ACPI

On Wednesday, December 23, 2015 05:19:39 PM Aleksey Makarov wrote:
> As discussed when Shannon Zhao sent a patch to add platform_device support
> to pl061 driver. Russel and other maintainers prefered that ACPI learned
> how to create AMBA devices rather than converting/adding platform_device
> support to AMBA drivers.
> 
> http://comments.gmane.org/gmane.linux.ports.arm.kernel/431364
> 
> 1) Adds basic AMBA device probing support to ACPI, it uses a whitelist of
> device IDs as the number of AMBA devices is limited. Currently the two ids
> present are those used in QEMU for arm64.
> 
> 2) Adds the plumbing into ACPI probe sequence.
> 
> 3) From ACPI pl011 is only defined (SBSA document) to be in SBSA mode which has
> reduced functionality. There may be a better method to do this that I have
> overlooked.
> 
> v4:
> - A memory leak has been fixed (Vladimir Zapolskiy)
> - ACPI_COMPANION() -> has_acpi_companion() (Andy Shevchenko)
> - pr_err() -> dev_err() (Andy Shevchenko)
> - The call to amba_register_dummy_clk() has been moved to to acpi_amba_init()
>   (Vladimir Zapolskiy)
> - Return value has been fixed (Vladimir Zapolskiy)
> 
> v3:
> https://lkml.kernel.org/g/1450716100-13688-1-git-send-email-aleksey.makarov@linaro.org
> - Compilation without CONFIG_ARM_AMBA has been fixed
> 
> v2:
> https://lkml.kernel.org/g/1450709399-7246-1-git-send-email-aleksey.makarov@linaro.org
> - A new ACPI scan handler for AMBA devices has been implemented
> - The order of `if` branches in amba-pl011.c has been changed
> - A couple of `static`s have been added
> - The compilation of the acpi_amba.c unit has made conditional
> - A comment on SBSA UART has been added
> 
> v1:
> https://lkml.kernel.org/g/1443609530-21524-1-git-send-email-graeme.gregory@linaro.org
> 
> Graeme Gregory (3):
>   ACPI: amba bus probing support
>   ACPI: scan add in amba probing
>   serial: amba-pl011: add ACPI support to AMBA probe

The ACPI part looks OK to me, but I'd really like to know whether or not the
ARM maintainers like this series too.

Thanks,
Rafael

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