linux-kernel - Re: [PATCH linux-next v3 6/7] ASoC: rsnd: add avb clocks

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Date:   Wed, 5 Dec 2018 08:58:44 +0000
From:   Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
To:     Jiada Wang <jiada_wang@...tor.com>
CC:     "lgirdwood@...il.com" <lgirdwood@...il.com>,
        "broonie@...nel.org" <broonie@...nel.org>,
        "perex@...ex.cz" <perex@...ex.cz>,
        "tiwai@...e.com" <tiwai@...e.com>,
        "vladimir_zapolskiy@...tor.com" <vladimir_zapolskiy@...tor.com>,
        "alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH linux-next v3 6/7] ASoC: rsnd: add avb clocks


Hi Jiada

> There are AVB Counter Clocks in ADG, each clock has 12bits integral
> and 8 bits fractional dividers which operates with S0D1ϕ clock.
> 
> This patch registers 8 AVB Counter Clocks when clock-cells of
> rcar_sound node is 2,
> 
> Signed-off-by: Jiada Wang <jiada_wang@...tor.com>
> ---


> +static void clk_avb_div_write(struct rsnd_adg *adg, u32 data, unsigned int idx)
(snip)
> +static u32 clk_avb_div_read(struct rsnd_adg *adg, unsigned int idx)

As I mentioned before, I think we can avoid confusable parameter by

	static void clk_avb_div_write(struct clk_avb *avb, u32 data)
	static u32 clk_avb_div_read(struct clk_avb)	

	div = clk_avb_div_read(avb);
	clk_avb_div_write(avb, val | div);

> +static struct clk *clk_register_avb(struct device *dev, struct rsnd_adg *adg,
> +				    unsigned int id, spinlock_t *lock)
> +{
> +	struct clk_init_data init;
> +	struct clk_avb *avb;
> +	struct clk *clk;
> +	char name[8];
> +	const char *parent_name;
> +
> +	if (IS_ERR(adg->clkadg))
> +		return ERR_PTR(-ENODEV);

I think adg->clkadg will never hit to IS_ERR().
It will have NULL or correct pointer.

	clk = devm_clk_get(dev, "adg");
	if (!IS_ERR(clk))
		adg->clkadg = clk;

And this "adg" clock is strange.
see below

> +	avb = devm_kzalloc(dev, sizeof(*avb), GFP_KERNEL);
> +	if (!avb)
> +		return ERR_PTR(-ENOMEM);
> +
> +	parent_name = __clk_get_name(adg->clkadg);

This parent_name is very strange to me.
AVB parent clk is "AUDIO_CLK_A/B/C/I" (= clk_a/b/c/i in this driver)
or "AUDIO_CLK_OUT_A/B/C/D" (= audio_clkout/1/2/3 in this driver).
And we don't have "adg" clock.
Please double check it.

Best regards
---
Kuninori Morimoto