linux-kernel - Re: [PATCH v3 05/11] media: adv748x: add support for HDMI audio

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Date:   Fri, 20 Mar 2020 18:09:31 -0700
From:   Stephen Boyd <sboyd@...nel.org>
To:     Alex Riesen <alexander.riesen@...itec.com>,
        Kieran Bingham <kieran.bingham@...asonboard.com>
Cc:     Geert Uytterhoeven <geert@...ux-m68k.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>,
        devel@...verdev.osuosl.org, linux-media@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-renesas-soc@...r.kernel.org,
        linux-clk <linux-clk@...r.kernel.org>
Subject: Re: [PATCH v3 05/11] media: adv748x: add support for HDMI audio

Quoting Alex Riesen (2020-03-20 09:12:00)
> diff --git a/drivers/media/i2c/adv748x/adv748x-dai.c b/drivers/media/i2c/adv748x/adv748x-dai.c
> new file mode 100644
> index 000000000000..6fce7d000423
> --- /dev/null
> +++ b/drivers/media/i2c/adv748x/adv748x-dai.c
> @@ -0,0 +1,265 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Driver for Analog Devices ADV748X HDMI receiver with AFE
> + * The implementation of DAI.
> + */
> +
> +#include "adv748x.h"
> +
> +#include <linux/clk.h>

Is this include used? Please try to make a clk provider or a clk
consumer and not both unless necessary.

> +#include <linux/clk-provider.h>
> +#include <sound/pcm_params.h>
> +
> +#define state_of(soc_dai) \
> +       adv748x_dai_to_state(container_of((soc_dai)->driver, \
> +                                         struct adv748x_dai, \
> +                                         drv))
> +
> +static const char ADV748X_DAI_NAME[] = "adv748x-i2s";
> +
[...]
> +       .set_sysclk = adv748x_dai_set_sysclk,
> +       .set_fmt = adv748x_dai_set_fmt,
> +       .startup = adv748x_dai_startup,
> +       .hw_params = adv748x_dai_hw_params,
> +       .mute_stream = adv748x_dai_mute_stream,
> +       .shutdown = adv748x_dai_shutdown,
> +};
> +
> +static int adv748x_of_xlate_dai_name(struct snd_soc_component *component,
> +                                     struct of_phandle_args *args,
> +                                     const char **dai_name)
> +{
> +       if (dai_name)
> +               *dai_name = ADV748X_DAI_NAME;
> +       return 0;
> +}
> +
> +static const struct snd_soc_component_driver adv748x_codec = {
> +       .of_xlate_dai_name = adv748x_of_xlate_dai_name,
> +};
> +
> +int adv748x_dai_init(struct adv748x_dai *dai)
> +{
> +       int ret;
> +       struct adv748x_state *state = adv748x_dai_to_state(dai);
> +
> +       dai->mclk_name = kasprintf(GFP_KERNEL, "%s.%s-i2s-mclk",
> +                                  state->dev->driver->name,
> +                                  dev_name(state->dev));
> +       if (!dai->mclk_name) {
> +               ret = -ENOMEM;
> +               adv_err(state, "No memory for MCLK\n");
> +               goto fail;
> +       }
> +       dai->mclk = clk_register_fixed_rate(state->dev,

Please register with clk_hw_register_fixed_rate() instead.

> +                                           dai->mclk_name,
> +                                           NULL /* parent_name */,
> +                                           0 /* flags */,
> +                                           12288000 /* rate */);

Not sure these comments are useful.

> +       if (IS_ERR_OR_NULL(dai->mclk)) {
> +               ret = PTR_ERR(dai->mclk);
> +               adv_err(state, "Failed to register MCLK (%d)\n", ret);
> +               goto fail;
> +       }
> +       ret = of_clk_add_provider(state->dev->of_node, of_clk_src_simple_get,
> +                                 dai->mclk);
> +       if (ret < 0) {
> +               adv_err(state, "Failed to add MCLK provider (%d)\n", ret);
> +               goto unreg_mclk;
> +       }
> +       dai->drv.name = ADV748X_DAI_NAME;
> +       dai->drv.ops = &adv748x_dai_ops;
> +       dai->drv.capture = (struct snd_soc_pcm_stream){

Can this be const?

> +               .stream_name    = "Capture",
> +               .channels_min   = 8,
> +               .channels_max   = 8,
> +               .rates = SNDRV_PCM_RATE_48000,
> +               .formats = SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_U24_LE,
> +       };
> +
> +       ret = devm_snd_soc_register_component(state->dev, &adv748x_codec,
> +                                             &dai->drv, 1);
> +       if (ret < 0) {
> +               adv_err(state, "Failed to register the codec (%d)\n", ret);
> +               goto cleanup_mclk;
> +       }
> +       return 0;
> +
> +cleanup_mclk:
> +       of_clk_del_provider(state->dev->of_node);
> +unreg_mclk:
> +       clk_unregister_fixed_rate(dai->mclk);
> +fail:
> +       return ret;
> +}
> +
> +void adv748x_dai_cleanup(struct adv748x_dai *dai)
> +{
> +       struct adv748x_state *state = adv748x_dai_to_state(dai);
> +
> +       of_clk_del_provider(state->dev->of_node);
> +       clk_unregister_fixed_rate(dai->mclk);
> +       kfree(dai->mclk_name);
> +}
> +

Please drop extra newline at end of file.