From: Sameer Pujar <spujar@nvidia.com>
To: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Cc: robh@kernel.org, alsa-devel@alsa-project.org,
devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
jonathanh@nvidia.com, sharadg@nvidia.com, broonie@kernel.org,
thierry.reding@gmail.com, linux-tegra@vger.kernel.org
Subject: Re: [PATCH 1/3] ASoC: simple-card-utils: Fix device module clock
Date: Sun, 14 Feb 2021 23:26:36 +0530 [thread overview]
Message-ID: <93c9d656-8379-b463-e724-e48ce486c17d@nvidia.com> (raw)
In-Reply-To: <87im6y5fv8.wl-kuninori.morimoto.gx@renesas.com>
Hi Morimoto-san,
On 2/12/2021 5:14 AM, Kuninori Morimoto wrote:
>> diff --git a/sound/soc/generic/simple-card-utils.c b/sound/soc/generic/simple-card-utils.c
>> index bc0b62e..0754d70 100644
>> --- a/sound/soc/generic/simple-card-utils.c
>> +++ b/sound/soc/generic/simple-card-utils.c
>> @@ -173,16 +173,15 @@ int asoc_simple_parse_clk(struct device *dev,
>> * or device's module clock.
>> */
>> clk = devm_get_clk_from_child(dev, node, NULL);
>> - if (!IS_ERR(clk)) {
>> - simple_dai->sysclk = clk_get_rate(clk);
>> + if (IS_ERR(clk))
>> + clk = devm_get_clk_from_child(dev, dlc->of_node, NULL);
>>
>> + if (!IS_ERR(clk)) {
>> simple_dai->clk = clk;
>> - } else if (!of_property_read_u32(node, "system-clock-frequency", &val)) {
>> + simple_dai->sysclk = clk_get_rate(clk);
>> + } else if (!of_property_read_u32(node, "system-clock-frequency",
>> + &val)) {
>> simple_dai->sysclk = val;
>> - } else {
>> - clk = devm_get_clk_from_child(dev, dlc->of_node, NULL);
>> - if (!IS_ERR(clk))
>> - simple_dai->sysclk = clk_get_rate(clk);
>> }
> The comment is indicating that that the clock parsing order,
> but this patch exchanges it.
> This comment also should be updated, I think.
>
> /*
> * Parse dai->sysclk come from "clocks = <&xxx>"
> * (if system has common clock)
> * or "system-clock-frequency = <xxx>"
> * or device's module clock.
> */
Yes, this can be rephrased now.
> asoc_simple_set_clk_rate() will be called if it has simple_dai->clk.
> CPU or Codec component clock rate will be exchanged by this patch, I think.
> I'm not sure the effect of this patch to existing boards.
If CPU or Codec node does not specifiy "mclk-fs" factor,
asoc_simple_set_clk_rate() won't be called. So I don't think there would
be any effect w.r.t clock rate. With this patch clocks would get
enabled/disabled.
>
> And also, this patch has too many unneeded exchange,
> thus it was difficult to read for me.
> I think it can be simply like this ?
> It is understandable what it want to do.
I think the patch does exactly the same thing as what you are suggesting
below. Am I missing anything?
>
> diff --git a/sound/soc/generic/simple-card-utils.c b/sound/soc/generic/simple-card-utils.c
> index 8c423afb9d2e..d441890de4dc 100644
> --- a/sound/soc/generic/simple-card-utils.c
> +++ b/sound/soc/generic/simple-card-utils.c
> @@ -168,16 +168,14 @@ int asoc_simple_parse_clk(struct device *dev,
> * or device's module clock.
> */
> clk = devm_get_clk_from_child(dev, node, NULL);
> + if (IS_ERR(clk))
> + clk = devm_get_clk_from_child(dev, dlc->of_node, NULL);
> +
> if (!IS_ERR(clk)) {
> simple_dai->sysclk = clk_get_rate(clk);
> -
> simple_dai->clk = clk;
> } else if (!of_property_read_u32(node, "system-clock-frequency", &val)) {
> simple_dai->sysclk = val;
> - } else {
> - clk = devm_get_clk_from_child(dev, dlc->of_node, NULL);
> - if (!IS_ERR(clk))
> - simple_dai->sysclk = clk_get_rate(clk);
> }
>
> if (of_property_read_bool(node, "system-clock-direction-out"))
next prev parent reply other threads:[~2021-02-14 17:57 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-10 6:43 [PATCH 0/3] Use clocks property in a device node Sameer Pujar
2021-02-10 6:43 ` [PATCH 1/3] ASoC: simple-card-utils: Fix device module clock Sameer Pujar
2021-02-11 23:44 ` Kuninori Morimoto
2021-02-14 17:56 ` Sameer Pujar [this message]
2021-02-14 23:25 ` Kuninori Morimoto
2021-03-09 14:41 ` Michael Walle
2021-03-09 16:27 ` Sameer Pujar
2021-03-09 22:30 ` Michael Walle
2021-03-10 14:50 ` Sameer Pujar
2021-03-10 18:14 ` Michael Walle
2021-03-10 19:19 ` Sameer Pujar
2021-03-11 10:27 ` Michael Walle
2021-03-11 11:05 ` Sameer Pujar
2021-03-11 11:16 ` Michael Walle
2021-03-11 14:29 ` Sameer Pujar
2021-03-11 15:43 ` Michael Walle
2021-03-11 16:41 ` Mark Brown
2021-03-11 16:15 ` Mark Brown
2021-03-11 22:11 ` Michael Walle
2021-03-12 11:35 ` Mark Brown
2021-03-12 12:01 ` Michael Walle
2021-03-12 12:04 ` Mark Brown
2021-03-12 12:30 ` Michael Walle
2021-03-12 13:46 ` Mark Brown
2021-03-15 12:05 ` Michael Walle
2021-03-15 15:19 ` Sameer Pujar
2021-03-15 15:33 ` Michael Walle
2021-03-15 15:57 ` Sameer Pujar
2021-03-15 15:39 ` Mark Brown
2021-03-15 17:10 ` Sameer Pujar
2021-03-15 17:13 ` Michael Walle
2021-03-11 16:00 ` Mark Brown
2021-03-11 21:34 ` Michael Walle
2021-02-10 6:43 ` [PATCH 2/3] Revert "ASoC: audio-graph-card: Add clocks property to endpoint node" Sameer Pujar
2021-02-11 13:00 ` Mark Brown
2021-02-10 6:43 ` [PATCH 3/3] arm64: tegra: Move clocks from RT5658 endpoint to device node Sameer Pujar
2021-02-11 15:38 ` [PATCH 0/3] Use clocks property in a " Mark Brown
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