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

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Message-ID: <20160727074020.GH6560@lukather>
Date:	Wed, 27 Jul 2016 09:40:20 +0200
From:	Maxime Ripard <maxime.ripard@...e-electrons.com>
To:	Jean-Francois Moine <moinejf@...e.fr>
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, Jul 27, 2016 at 09:18:27AM +0200, Jean-Francois Moine wrote:
> 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.

Why? It should return NULL when there's no parent, while you
explicitly registered a parent.

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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