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

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Date:	Fri, 5 Feb 2016 12:14:08 +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

Hi,

On Thu, Feb 04, 2016 at 09:56:02PM +0100, Krzysztof Adamski wrote:
> 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...
> 
> Seems like a good idea but is it possible to remove those binding in
> separate patch?

Yeah, you can (and should) do that as a separate patch, that can be
part of the next iteration of this set.

> I mean, wouldn't that, in theory, break ABI? Are such
> patches accepted?

It would, but it doesn't matter.

Maxime

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

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