linux-kernel - Re: [PATCHv4 1/5] clk: mvebu: support for 98DX3236 SoC

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Date:   Fri, 20 Jan 2017 16:48:19 -0800
From:   Stephen Boyd <sboyd@...eaurora.org>
To:     Chris Packham <chris.packham@...iedtelesis.co.nz>
Cc:     linux-arm-kernel@...ts.infradead.org,
        Michael Turquette <mturquette@...libre.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>, linux-clk@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCHv4 1/5] clk: mvebu: support for 98DX3236 SoC

On 01/13, Chris Packham wrote:
> @@ -158,6 +170,14 @@ static const struct coreclk_soc_desc axp_coreclks = {
>  	.num_ratios = ARRAY_SIZE(axp_coreclk_ratios),
>  };
>  
> +static const struct coreclk_soc_desc mv98dx3236_coreclks = {
> +	.get_tclk_freq = mv98dx3236_get_tclk_freq,
> +	.get_cpu_freq = mv98dx3236_get_cpu_freq,
> +	.get_clk_ratio = NULL,
> +	.ratios = NULL,
> +	.num_ratios = 0,

Are these intentionally initialized to 0 explicitly? Otherwise we
could leave them out and it's all the same.

> +};
> +
>  /*
>   * Clock Gating Control
>   */
[..]
> @@ -243,5 +245,30 @@ static void __init of_cpu_clk_setup(struct device_node *node)
>  	iounmap(clock_complex_base);
>  }
>  
> +/* Use this function to call the generic setup with the correct
> + * clock operation
> + */
> +static void __init of_cpu_clk_setup(struct device_node *node)
> +{
> +	_of_cpu_clk_setup(node, &cpu_ops);
> +}
> +
>  CLK_OF_DECLARE(armada_xp_cpu_clock, "marvell,armada-xp-cpu-clock",
>  					 of_cpu_clk_setup);
> +
> +/* Define the clock and operations for the mv98dx3236 - it cannot perform
> + * any operations.
> + */
> +static const struct clk_ops mv98dx3236_cpu_ops = {
> +	.recalc_rate = NULL,
> +	.round_rate = NULL,
> +	.set_rate = NULL,

But clk_set_rate() works silently? Why not just register a clk
provider that returns a NULL pointer? Then there isn't any
structure to maintain?

-- 
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