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

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Message-ID: <OFF188389D.68E638A2-ONC12575F2.00568C5B-C12575F2.0057FC95@transmode.se>
Date:	Mon, 13 Jul 2009 18:01:02 +0200
From:	Joakim Tjernlund <joakim.tjernlund@...nsmode.se>
To:	avorontsov@...mvista.com
Cc:	David Brownell <dbrownell@...rs.sourceforge.net>,
	linux-kernel@...r.kernel.org, linuxppc-dev@...abs.org
Subject: Re: [PATCH 0/2] Setting GPIOs simultaneously


Anton Vorontsov <avorontsov@...mvista.com> wrote on 13/07/2009 17:19:11:
>
> Hi all,
>
> I've been sitting on these patches for some time, but now it appears
> that the set_sync() feature is needed elsewhere. So here are the
> patches.
>
> Joakim, I think this is what you need.

Yes, it sure looks so :) I will have to look closer later as
I will be traveling the next few days.

Question though, have you considered using a bitmask instead of
an array:
static void qe_gpio_set_sync(struct gpio_chip *gc, unsigned int num,
	 		      unsigned int gpio_mask, unsigned int vals)
If you want to set bit 0, 3 and 8 you would set positions 0, 3 and 8 in gpio_mask
to ones. Similarly in vals, set bit positions 0, 3 and 8 to requested value.

While being at it, the reason for me needing this is that the spi_mpc83xx driver
was recently converted to a OF only driver so I have no way of defining my own
CS function anymore. While OF is good I don't feel that OF drivers should block the native
method, OF should be a layer on top of the native methods.

 Jocke

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