linux-kernel - Re: [PATCH v3 1/5] clk: sunxi: Add apb0 gates for H3

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Date:	Tue, 9 Feb 2016 18:10:40 +0100
From:	Maxime Ripard <maxime.ripard@...e-electrons.com>
To:	Krzysztof Adamski <k@...ko.eu>
Cc:	Jean-Francois Moine <moinejf@...e.fr>,
	inus Walleij <linus.walleij@...aro.org>,
	Chen-Yu Tsai <wens@...e.org>,
	Hans de Goede <hdegoede@...hat.com>,
	Lee Jones <lee@...nel.org>, Rob Herring <robh@...nel.org>,
	Jens Kuske <jenskuske@...il.com>,
	Fabian Frederick <fabf@...net.be>,
	Vishnu Patekar <vishnupatekar0510@...il.com>,
	linux-gpio@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, linux-sunxi@...glegroups.com
Subject: Re: [PATCH v3 1/5] clk: sunxi: Add apb0 gates for H3

On Fri, Feb 05, 2016 at 12:58:37PM +0100, Krzysztof Adamski wrote:
> On Fri, Feb 05, 2016 at 12:11:52PM +0100, Maxime Ripard wrote:
> >Hi,
> >
> >On Thu, Feb 04, 2016 at 03:47:52PM +0100, Jean-Francois Moine wrote:
> >>On Thu,  4 Feb 2016 00:33:46 +0100
> >>Krzysztof Adamski <k@...ko.eu> wrote:
> >>
> >>> This patch adds support for APB0 in H3. It seems to be compatible with
> >>> earlier SOCs. apb0 gates controls R_ block peripherals (R_PIO, R_IR,
> >>> etc).
> >>>
> >>> Signed-off-by: Krzysztof Adamski <k@...ko.eu>
> >>> ---
> >>>  Documentation/devicetree/bindings/clock/sunxi.txt | 1 +
> >>>  drivers/clk/sunxi/clk-simple-gates.c              | 2 ++
> >>>  2 files changed, 3 insertions(+)
> >>>
> >>> diff --git a/Documentation/devicetree/bindings/clock/sunxi.txt b/Documentation/devicetree/bindings/clock/sunxi.txt
> >>> index e59f57b..751c8b9f0 100644
> >>> --- a/Documentation/devicetree/bindings/clock/sunxi.txt
> >>> +++ b/Documentation/devicetree/bindings/clock/sunxi.txt
> >>> @@ -45,6 +45,7 @@ Required properties:
> >>>  	"allwinner,sun6i-a31-apb0-gates-clk" - for the APB0 gates on A31
> >>>  	"allwinner,sun7i-a20-apb0-gates-clk" - for the APB0 gates on A20
> >>>  	"allwinner,sun8i-a23-apb0-gates-clk" - for the APB0 gates on A23
> >>> +	"allwinner,sun8i-h3-apb0-gates-clk" - for the APB0 gates on H3
> >>>  	"allwinner,sun9i-a80-apb0-gates-clk" - for the APB0 gates on A80
> >>>  	"allwinner,sun4i-a10-apb1-clk" - for the APB1 clock
> >>>  	"allwinner,sun9i-a80-apb1-clk" - for the APB1 bus clock on A80
> >>> diff --git a/drivers/clk/sunxi/clk-simple-gates.c b/drivers/clk/sunxi/clk-simple-gates.c
> >>> index f4da52b..6753c87 100644
> >>> --- a/drivers/clk/sunxi/clk-simple-gates.c
> >>> +++ b/drivers/clk/sunxi/clk-simple-gates.c
> >>> @@ -130,6 +130,8 @@ CLK_OF_DECLARE(sun8i_a23_apb2, "allwinner,sun8i-a23-apb2-gates-clk",
> >>>  	       sunxi_simple_gates_init);
> >>>  CLK_OF_DECLARE(sun8i_a33_ahb1, "allwinner,sun8i-a33-ahb1-gates-clk",
> >>>  	       sunxi_simple_gates_init);
> >>> +CLK_OF_DECLARE(sun8i_h3_apb0, "allwinner,sun8i-h3-apb0-gates-clk",
> >>> +	       sunxi_simple_gates_init);
> >>>  CLK_OF_DECLARE(sun9i_a80_ahb0, "allwinner,sun9i-a80-ahb0-gates-clk",
> >>>  	       sunxi_simple_gates_init);
> >>>  CLK_OF_DECLARE(sun9i_a80_ahb1, "allwinner,sun9i-a80-ahb1-gates-clk",
> >>
> >>It seems that the other compatible strings are there for historical
> >>reasons. Why do you need a new one with such a specific name?
> >>
> >>It would have been more sensible to add a generic compatible string as
> >>"allwinner,apb-gates", letting the removal of the other strings for a
> >>later patch...
> >
> >Yeah, it's a good idea, and it's probably time that we move to that.
> >
> >However, I'd like to keep per-soc and per-clocks compatibles in the
> >DT, in case we need to protect a clock in the future. That doesn't
> >prevent to have two compatibles thoughe, the specific and the generic.
> >
> 
> So now I'm not sure what you mean. You suggest that I should keep using
> specific (sun8i_h3_apb0) or change to generic (apb-gates) in my patch?

Both.

To have something like that:

compatible = "allwinner,sun8i-h3-apb0-gates-clk", "allwinner,sun4i-a10-gates-clk";

sun4i-a10-gates-clk being the generic compatible that we would use,
and we can always match against the h3 specific compatible if we need
to have a different behaviour.

Maxime

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

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