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

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Message-ID: <612ee648-c217-e9b4-224c-87183e43d83d@mentor.com>
Date:   Wed, 5 Dec 2018 21:16:13 +0900
From:   Jiada Wang <jiada_wang@...tor.com>
To:     Kuninori Morimoto <kuninori.morimoto.gx@...esas.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 Morimoto-san

Thanks for your comments

On 2018/12/05 17:58, Kuninori Morimoto wrote:
> 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);
right, I forgot to update this, will address it in next version
>> +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.
right, will update this in next version
> 	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.
I have some local device-tree change, which expends 'adg' register range 
and add
"adg" clock to rcar_sound node which refer to newly added 'adg' clock 
(S0D1ϕ) in this patch-set

the change looks like the following

                         compatible =  "renesas,rcar_sound-r8a7795", 
"renesas,rcar_sound-gen3";
                         reg =   <0 0xec500000 0 0x1000>, /* SCU */
-                               <0 0xec5a0000 0 0x100>,  /* ADG */
+                               <0 0xec5a0000 0 0x140>,  /* ADG */
                                 <0 0xec540000 0 0x1000>, /* SSIU */
                                 <0 0xec541000 0 0x280>,  /* SSI */
                                 <0 0xec740000 0 0x200>;  /* Audio DMAC 
peri peri*/
                         reg-names = "scu", "adg", "ssiu", "ssi", "audmapp";

-                       clocks = <&cpg CPG_MOD 1005>,
+                       clocks = <&cpg CPG_MOD 922>, <&cpg CPG_MOD 1005>,
                                  <&cpg CPG_MOD 1006>, <&cpg CPG_MOD 1007>,
                                  <&cpg CPG_MOD 1008>, <&cpg CPG_MOD 1009>,
                                  <&cpg CPG_MOD 1010>, <&cpg CPG_MOD 1011>,
@@ -1856,7 +1856,7 @@
                                  <&audio_clk_a>, <&audio_clk_b>,
                                  <&audio_clk_c>,
                                  <&cpg CPG_CORE R8A7795_CLK_S0D4>;
-                       clock-names = "ssi-all",
+                       clock-names = "adg", "ssi-all",
                                       "ssi.9", "ssi.8", "ssi.7", "ssi.6",
                                       "ssi.5", "ssi.4", "ssi.3", "ssi.2",
                                       "ssi.1", "ssi.0",

Thanks,
Jiada

> Best regards
> ---
> Kuninori Morimoto