linux-kernel - Re: Ang: Re: [PATCH 0/2] Setting GPIOs simultaneously

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Date:	Tue, 4 Aug 2009 18:22:50 +0400
From:	Anton Vorontsov <avorontsov@...mvista.com>
To:	Joakim Tjernlund <joakim.tjernlund@...nsmode.se>
Cc:	dbrownell@...rs.sourceforge.net, linux-kernel@...r.kernel.org,
	linuxppc-dev@...abs.org
Subject: Re: Ang: Re: [PATCH 0/2] Setting GPIOs simultaneously

On Tue, Aug 04, 2009 at 03:38:40PM +0200, Joakim Tjernlund wrote:
> Anton Vorontsov <avorontsov@...mvista.com> wrote on 15/07/2009 00:09:31:
> >
> > On Tue, Jul 14, 2009 at 11:20:13PM +0200, Joakim Tjernlund wrote:
> > [...]
> > > >But any users of the legacy bindings should be in-tree.
> > >
> > > ehh, it was working until you made it OF only. Why do call the native
> > > way legacy?  It is the method all non OF arch uses.
> >
> > It's legacy because there are no in-tree users anymore. Nowadays
> > we're trying to pass all needed information via OF, and we're
> > trying to avoid ugly platform-dependant hacks. Your SPI scheme
> > can be easily described via OF, but sure, it's hard to implement
> > it with the current SPI/OF subsystem.
> 
> Sorry for the long delay, I have been on vaction and been busy with other stuff.
> 
> Tell me, how does this new OF SPI device scheme work out if you want
> to use the bitbanged SPI driver?

spi-controller {
	...
	compatible = "generic-bitbang-spi";
	gpios = <GPIO_CLK GPIO_MOSI GPIO_MISO>;
	spi,chip-select-machines = <&gpio_csm &board_csm>;

	gpio_csm: chip-select-machine {
		#address-cells = <1>;
		#size-cells = <0>;
		compatible = "generic-gpio-csm";
		gpios = <GPIO_CS1 GPIO_CS2>;

		touchscreen@0 {
			reg = <0>; /* using GPIO CS1 */
		};

		eeprom@1 {
			reg = <1>; /* using GPIO CS2 */
		};
	};
};

localbus {
	...
	board_csm: chip-select-machine {
		#address-cells = <1>;
		#size-cells = <0>;
		compatibe = "board-specific-csm";

		light-sensor@0 {
			reg = <0>; /* using board-specific "CS3" */
		};

		battery@1 {
			reg = <1>; /* using board-specific "CS4" */
		};
	};
};

-- 
Anton Vorontsov
email: cbouatmailru@...il.com
irc://irc.freenode.net/bd2
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