linux-kernel - Re: [PATCH 18/20] clocksource / acpi: Add macro CLOCKSOURCE_ACPI

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Date:	Wed, 22 Jan 2014 09:26:50 +0100
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Hanjun Guo <hanjun.guo@...aro.org>
Cc:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Grant Likely <grant.likely@...aro.org>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Olof Johansson <olof@...om.net>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Rob Herring <robh@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Arnd Bergmann <arnd@...db.de>,
	Patch Tracking <patches@...aro.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linaro-kernel <linaro-kernel@...ts.linaro.org>,
	"linaro-acpi@...ts.linaro.org" <linaro-acpi@...ts.linaro.org>,
	Charles Garcia-Tobin <Charles.Garcia-Tobin@....com>,
	Amit Daniel Kachhap <amit.daniel@...sung.com>
Subject: Re: [PATCH 18/20] clocksource / acpi: Add macro CLOCKSOURCE_ACPI_DECLARE

On Fri, Jan 17, 2014 at 1:25 PM, Hanjun Guo <hanjun.guo@...aro.org> wrote:

> From: Amit Daniel Kachhap <amit.daniel@...sung.com>
>
> This macro does the same job as CLOCKSOURCE_OF_DECLARE. The device
> name from the ACPI timer table is matched with all the registered
> timer controllers and matching initialisation routine is invoked.
>
> Signed-off-by: Amit Daniel Kachhap <amit.daniel@...sung.com>
> Signed-off-by: Hanjun Guo <hanjun.guo@...aro.org>

Actually I have a fat patch renaming CLOCKSOURCE_OF_DECLARE()
to TIMER_OF_DECLARE() and I think this macro, if needed, should
be named TIMER_ACPI_DECLARE().

The reason is that "clocksource" is a Linux-internal name and this
macro pertains to the hardware name in respective system
description type.

> +#ifdef CONFIG_ACPI
> +#define CLOCKSOURCE_ACPI_DECLARE(name, compat, fn)                     \
> +       static const struct acpi_device_id __clksrc_acpi_table_##name   \
> +               __used __section(__clksrc_acpi_table)                   \
> +                = { .id = compat,                              \
> +                    .driver_data = (kernel_ulong_t)fn }
> +#else
> +#define CLOCKSOURCE_ACPI_DECLARE(name, compat, fn)
> +#endif

This hammers down the world to compile one binary for ACPI
and one binary for device tree. Maybe that's fine, I don't know.

Yours,
Linus Walleij
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