Re: [PATCHv9 1/3] Runtime Interpreted Power Sequences
From: Grant Likely <hidden>
Date: 2012-11-26 16:42:14
Also in:
linux-arm-kernel, linux-fbdev, linux-pm, linux-tegra, lkml
From: Grant Likely <hidden>
Date: 2012-11-26 16:42:14
Also in:
linux-arm-kernel, linux-fbdev, linux-pm, linux-tegra, lkml
On Thu, 22 Nov 2012 22:40:21 +0100, Thierry Reding [off-list ref] wrote:
On Thu, Nov 22, 2012 at 01:39:41PM +0000, Grant Likely wrote: [...]quoted
I do think that each sequence should be contained within a single property, but I'm open to other suggestions.IIRC a very early prototype did implement something like that. However because of the resource issues this had to be string based, so that the sequences looked somewhat like (Alex, correct me if I'm wrong): power-on = <"REGULATOR", "power", 1, "GPIO", "enable", 1>; Instead we could possibly have something like: power-on = <0 ® 1, 1 &gpio 42 0 1>;
Yes, that would work, although I still think it would be a good idea to split the used resources off into the gpios/pwms/regs/etc properties.
Where the first cell in each entry defines the type (0 = regulator, 1 = GPIO) and the rest would be a regular OF specifier for the given type of resource along with some defined parameter such as enable/disable, voltage, delay in ms, ... I don't know if that sounds any better. It looks sort of cryptic but it is more "in the spirit of" DT, right Grant?
It is still kind of a ham-handed approach, but it does fit better with existing conventions than the hierarchy of nodes does. g.