linux-kernel - Re: [PATCH 2/3] spi: of: allow instantiating slaves without a driver

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Date:	Sun, 26 Jun 2016 12:58:15 +0100
From:	Mark Brown <broonie@...nel.org>
To:	Michal Suchanek <hramrach@...il.com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Ingo Molnar <mingo@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Kees Cook <keescook@...omium.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Dan Williams <dan.j.williams@...el.com>,
	Tejun Heo <tj@...nel.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Davidlohr Bueso <dave@...olabs.net>,
	Andrey Ryabinin <aryabinin@...tuozzo.com>,
	Nikolay Aleksandrov <nikolay@...ulusnetworks.com>,
	Dmitry Vyukov <dvyukov@...gle.com>,
	Adrien Schildknecht <adrien+dev@...ischi.me>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-spi <linux-spi@...r.kernel.org>
Subject: Re: [PATCH 2/3] spi: of: allow instantiating slaves without a driver

On Sun, Jun 26, 2016 at 01:35:46PM +0200, Michal Suchanek wrote:
> On 26 June 2016 at 13:21, Mark Brown <broonie@...nel.org> wrote:

> > You can just add the entire slave node in the overlay, it's not clear
> > that this buys us anything useful

> You have to target the master node and specify the CS in the overlay
> if you create the whole node. If you target the slave node you have
> the CS specified in the board devicetree and the overlay can apply to
> multiple boards without change.

No, there's a lot more to having overlays to board-neutral connectors...

> > and this needs to be joined up with the work going on to allow
> > expansion connector overlays to be loaded in the first place.

> The overlays work equally well before and after this patch. I don't
> see any problem with them other than part of the infrastructure
> missing in mainline kernel.

...you're missing all this stuff here - currently the active work on
this is being done by Patelis.  It's not at all clear to me that
referring to a slave rather than a master would be any easier in a board
neutral overlay.

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