linux-kernel - Re: [PATCH 4/9] clk: sunxi-ng: mux: Add support for mux tables

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Date:	Wed, 27 Jul 2016 09:18:27 +0200
From:	Jean-Francois Moine <moinejf@...e.fr>
To:	Maxime Ripard <maxime.ripard@...e-electrons.com>
Cc:	Chen-Yu Tsai <wens@...e.org>,
	Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...eaurora.org>,
	Rob Herring <robh+dt@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	devicetree@...r.kernel.org, dev@...ux-sunxi.org,
	linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 4/9] clk: sunxi-ng: mux: Add support for mux tables

On Wed, 27 Jul 2016 08:59:34 +0200
Maxime Ripard <maxime.ripard@...e-electrons.com> wrote:

> On Tue, Jul 26, 2016 at 07:43:06PM +0200, Jean-Francois Moine wrote:
> > On Tue, 26 Jul 2016 15:04:26 +0800
> > Chen-Yu Tsai <wens@...e.org> wrote:
> > 
> > > Some clock muxes have holes, i.e. invalid or unconnected inputs,
> > > between parent mux values.
> > > 
> > > Add support for specifying a mux table to map clock parents to
> > > mux values.
> > 
> > Putting empty strings in the holes should work. No?
> > Ex:
> > 
> > static const char * const csi_mclk_parents[] =
> > 	{ "pll-video0", "pll-video1", "", "", "", "osc24M" };
> 
> Not really. The clock would be declared as orphan, while it's really
> not.
> 
> Parenting functions would also not work as expected,
> clk_hw_get_parent_by_index being the obvious example, in that case
> returning the empty string for an invalid parent, while it should
> really return NULL.

I don't see why the clock should be orphan.
Then, when a parent is "", clk_hw_get_parent_by_index() returns NULL.

-- 
Ken ar c'hentañ	|	      ** Breizh ha Linux atav! **
Jef		|		http://moinejf.free.fr/