linux-kernel - Re: [PATCH 1/2] ASoC: SOF: imx: Add code to manage DSP related clocks

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Date:   Thu, 2 Sep 2021 16:35:56 +0300
From:   Péter Ujfalusi <peter.ujfalusi@...ux.intel.com>
To:     Daniel Baluta <daniel.baluta@....nxp.com>, broonie@...nel.org,
        pierre-louis.bossart@...ux.intel.com, lgirdwood@...il.com,
        robh+dt@...nel.org, devicetree@...r.kernel.org
Cc:     Daniel Baluta <daniel.baluta@....com>, alsa-devel@...a-project.org,
        kai.vehmanen@...ux.intel.com, shawnguo@...nel.org,
        ranjani.sridharan@...ux.intel.com, linux-kernel@...r.kernel.org,
        linux-imx@....com, kernel@...gutronix.de, s-anna@...com,
        festevam@...il.com
Subject: Re: [PATCH 1/2] ASoC: SOF: imx: Add code to manage DSP related clocks

Hi Daniel,

On 02/09/2021 15:32, Daniel Baluta wrote:
> From: Daniel Baluta <daniel.baluta@....com>
> 
> There are two types of clocks:
> 	* DSP IP clocks
> 	* DAI clocks
> 
> This clocks are necessary in order to power up DSP and DAIs.
> 
> We choose to enable DAI clocks here because of the way i.MX8/i.MX8X
> design handles resources (including clocks).
> 
> All clocks are managed by a separate core (named SCU) which communicates
> with Linux managed ARM core via a well known API.
> 
> We parse and enable the clocks in probe function and disable them in
> remove function.
> 
> Future patches will introduce Power Management support so that we
> disable clocks while DSP is not used or system enters power save.

Unfortunately this patch does not apply to next.

I might be a bit too cautius, but I would also add "&& COMMON_CLK" for 
the COMPILE_TEST in Kconfig or select it from where it is appropriate?

> Signed-off-by: Daniel Baluta <daniel.baluta@....com>
> ---
>   sound/soc/sof/imx/imx-common.c | 77 ++++++++++++++++++++++++++++++++++
>   sound/soc/sof/imx/imx-common.h | 16 +++++++
>   sound/soc/sof/imx/imx8.c       | 32 ++++++++++++++
>   sound/soc/sof/imx/imx8m.c      | 33 +++++++++++++++
>   4 files changed, 158 insertions(+)
> 
> diff --git a/sound/soc/sof/imx/imx8m.c b/sound/soc/sof/imx/imx8m.c
> index 30624fafc632..482c25ab15ce 100644
> --- a/sound/soc/sof/imx/imx8m.c
> +++ b/sound/soc/sof/imx/imx8m.c
> @@ -23,6 +23,20 @@
>   #define MBOX_OFFSET	0x800000
>   #define MBOX_SIZE	0x1000
>   
> +#define IMX8M_DSP_CLK_NUM	3
> +static const char *imx8m_dsp_clks_names[IMX8M_DSP_CLK_NUM] = {

static const char *imx8m_dsp_clks_names[]

+ ARRAY_SIZE(imx8m_dsp_clks_names) instead IMX8M_DSP_CLK_NUM ?


-- 
Péter