linux-kernel - Re: [PATCH 1/6] clk: sunxi: Add DRAM gates support for sun4i-a10

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Message-ID: <20151207141508.GA21137@rob-hp-laptop>
Date:	Mon, 7 Dec 2015 08:15:08 -0600
From:	Rob Herring <robh@...nel.org>
To:	Chen-Yu Tsai <wens@...e.org>
Cc:	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Emilio Lopez <emilio@...pez.com.ar>,
	Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...eaurora.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>, linux-clk@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-sunxi@...glegroups.com
Subject: Re: [PATCH 1/6] clk: sunxi: Add DRAM gates support for sun4i-a10

On Sat, Dec 05, 2015 at 05:00:04PM +0800, Chen-Yu Tsai wrote:
> The A10/A20 share the same set of DRAM clock gates, which controls
> direct memory access for some peripherals.
> 
> On the A10, bit 15 controls the system's DRAM clock output (possibly
> to the DRAM chips), which we need to keep on.
> 
> On the A20 this has been moved to the DRAM controller, becoming a no-op.
> However it is still listed in the user manual, so add it anyway.
> 
> Signed-off-by: Chen-Yu Tsai <wens@...e.org>

Acked-by: Rob Herring <robh@...nel.org>

Perhaps someone should go and add all the compatible strings you need 
here. You don't have to have a user in the kernel. These oneline binding 
changes are getting old...

Rob

> ---
>  Documentation/devicetree/bindings/clock/sunxi.txt |  1 +
>  drivers/clk/sunxi/clk-simple-gates.c              | 12 ++++++++++++
>  2 files changed, 13 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/clock/sunxi.txt b/Documentation/devicetree/bindings/clock/sunxi.txt
> index 153ac72869e8..ef0b452806b1 100644
> --- a/Documentation/devicetree/bindings/clock/sunxi.txt
> +++ b/Documentation/devicetree/bindings/clock/sunxi.txt
> @@ -57,6 +57,7 @@ Required properties:
>  	"allwinner,sun6i-a31-apb2-gates-clk" - for the APB2 gates on A31
>  	"allwinner,sun8i-a23-apb2-gates-clk" - for the APB2 gates on A23
>  	"allwinner,sun9i-a80-apbs-gates-clk" - for the APBS gates on A80
> +	"allwinner,sun4i-a10-dram-gates-clk" - for the DRAM gates on A10
>  	"allwinner,sun5i-a13-mbus-clk" - for the MBUS clock on A13
>  	"allwinner,sun4i-a10-mmc-clk" - for the MMC clock
>  	"allwinner,sun9i-a80-mmc-clk" - for mmc module clocks on A80
> diff --git a/drivers/clk/sunxi/clk-simple-gates.c b/drivers/clk/sunxi/clk-simple-gates.c
> index c8acc0612c15..f4da52b5ca0e 100644
> --- a/drivers/clk/sunxi/clk-simple-gates.c
> +++ b/drivers/clk/sunxi/clk-simple-gates.c
> @@ -160,3 +160,15 @@ CLK_OF_DECLARE(sun5i_a13_ahb, "allwinner,sun5i-a13-ahb-gates-clk",
>  	       sun4i_a10_ahb_init);
>  CLK_OF_DECLARE(sun7i_a20_ahb, "allwinner,sun7i-a20-ahb-gates-clk",
>  	       sun4i_a10_ahb_init);
> +
> +static const int sun4i_a10_dram_critical_clocks[] __initconst = {
> +	15,	/* dram_output */
> +};
> +
> +static void __init sun4i_a10_dram_init(struct device_node *node)
> +{
> +	sunxi_simple_gates_setup(node, sun4i_a10_dram_critical_clocks,
> +				 ARRAY_SIZE(sun4i_a10_dram_critical_clocks));
> +}
> +CLK_OF_DECLARE(sun4i_a10_dram, "allwinner,sun4i-a10-dram-gates-clk",
> +	       sun4i_a10_dram_init);
> -- 
> 2.6.2
> 
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