linux-kernel - Re: [PATCH v3 14/36] mtd: st_spi_fsm: Add device-tree binding documentation

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Date:	Tue, 3 Dec 2013 12:31:28 +0000
From:	Lee Jones <lee.jones@...aro.org>
To:	Linus Walleij <linus.walleij@...aro.org>
Cc:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	David Woodhouse <dwmw2@...radead.org>,
	"linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
	angus.clark@...com,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH v3 14/36] mtd: st_spi_fsm: Add device-tree binding
 documentation

On Tue, 03 Dec 2013, Linus Walleij wrote:

> On Tue, Dec 3, 2013 at 12:31 PM, Lee Jones <lee.jones@...aro.org> wrote:
> > On Tue, 03 Dec 2013, Linus Walleij wrote:
> 
> >> So it can be in <linux/mfd/my-sysconfig-regs.h> as
> >> a
> >>
> >> #define MY_SYSCON_V1_BOOT_DEV_REG 0x958
> >> #define MY_SYSCON_V1_BOOT_DEV_SPI 0x1a
> >>
> >> The kernel should know which SoC is in use and
> >> act apropriately right?
> >
> > And this have lots of machine_is() calls everywhere?
> 
> No need for Mr. Everywhere to know about the SoC.
> 
> There are other ways to achieve this. arch/arm/mach-foo
> always knows which ASIC it is running on, and it can do
> various things:
> 
> - Add device tree fragments/overlays (OK high-tech, but
>   we're getting to this, inevitably)
> 
> - Selectively add AUXDATA, which is absolutely OK if
>   we can do autoprobing of hardware IMO.

I prefer our solution TBH.

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog
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