linux-kernel - Re: [PATCH v5 2/5] clk: shmobile: div6: Make clock-output-names optional

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Date:	Fri, 30 Oct 2015 15:47:25 +0200
From:	Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:	Geert Uytterhoeven <geert+renesas@...der.be>
Cc:	Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...eaurora.org>,
	Magnus Damm <damm+renesas@...nsource.se>,
	Simon Horman <horms+renesas@...ge.net.au>,
	linux-clk@...r.kernel.org, linux-sh@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 2/5] clk: shmobile: div6: Make clock-output-names optional

Hi Geert,

Thank you for the patch.

On Thursday 29 October 2015 12:21:01 Geert Uytterhoeven wrote:
> Renesas DIV6 clocks provide a single clock output.  Hence make the
> "clock-output-names" DT property optional instead of mandatory. In case
> the DT property is omitted the DT node name will be used.
> 
> Rename the variable "name" to "clk_name" to make the code more similar
> with fixed-factor-clock.c, and to avoid a conflict with a nested local
> variable while we're at it.
> 
> Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
> ---
> v5:
>   - Integrated in this series as a dependency.

The patch looks sane, by why is it a dependency ?

> ---
>  .../devicetree/bindings/clock/renesas,cpg-div6-clocks.txt   |  4 ++++
>  drivers/clk/shmobile/clk-div6.c                             | 13
>  +++----------
>  2 files changed, 7 insertions(+), 10 deletions(-)
> 
> diff --git
> a/Documentation/devicetree/bindings/clock/renesas,cpg-div6-clocks.txt
> b/Documentation/devicetree/bindings/clock/renesas,cpg-div6-clocks.txt index
> 5ddb68418655d569..86008ad354cf4bbd 100644
> --- a/Documentation/devicetree/bindings/clock/renesas,cpg-div6-clocks.txt
> +++ b/Documentation/devicetree/bindings/clock/renesas,cpg-div6-clocks.txt
> @@ -20,6 +20,10 @@ Required Properties:
>      clocks must be specified.  For clocks with multiple parents, invalid
>      settings must be specified as "<0>".
>    - #clock-cells: Must be 0
> +
> +
> +Optional Properties:
> +
>    - clock-output-names: The name of the clock as a free-form string
> 
> 
> diff --git a/drivers/clk/shmobile/clk-div6.c
> b/drivers/clk/shmobile/clk-div6.c index 036a692c72195db9..c89566a918290246
> 100644
> --- a/drivers/clk/shmobile/clk-div6.c
> +++ b/drivers/clk/shmobile/clk-div6.c
> @@ -178,10 +178,9 @@ static void __init cpg_div6_clock_init(struct
> device_node *np) const char **parent_names;
>  	struct clk_init_data init;
>  	struct div6_clock *clock;
> -	const char *name;
> +	const char *clk_name = np->name;
>  	struct clk *clk;
>  	unsigned int i;
> -	int ret;
> 
>  	clock = kzalloc(sizeof(*clock), GFP_KERNEL);
>  	if (!clock)
> @@ -215,13 +214,7 @@ static void __init cpg_div6_clock_init(struct
> device_node *np) clock->div = (clk_readl(clock->reg) & CPG_DIV6_DIV_MASK) +
> 1;
> 
>  	/* Parse the DT properties. */
> -	ret = of_property_read_string(np, "clock-output-names", &name);
> -	if (ret < 0) {
> -		pr_err("%s: failed to get %s DIV6 clock output name\n",
> -		       __func__, np->name);
> -		goto error;
> -	}
> -
> +	of_property_read_string(np, "clock-output-names", &clk_name);
> 
>  	for (i = 0, valid_parents = 0; i < num_parents; i++) {
>  		const char *name = of_clk_get_parent_name(np, i);
> @@ -255,7 +248,7 @@ static void __init cpg_div6_clock_init(struct
> device_node *np) }
> 
>  	/* Register the clock. */
> -	init.name = name;
> +	init.name = clk_name;
>  	init.ops = &cpg_div6_clock_ops;
>  	init.flags = CLK_IS_BASIC;
>  	init.parent_names = parent_names;

-- 
Regards,

Laurent Pinchart

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