linux-kernel - Re: [PATCH v4 1/7] sound: sam9x5_wm8731: machine driver for at91sam9x5 wm8731 boards

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Date:	Wed, 10 Jul 2013 14:11:48 +0800
From:	Bo Shen <voice.shen@...el.com>
To:	Richard Genoud <richard.genoud@...il.com>
CC:	Mark Brown <broonie@...nel.org>,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	Liam Girdwood <lgirdwood@...il.com>,
	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>,
	Lars-Peter Clausen <lars@...afoo.de>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <alsa-devel@...a-project.org>,
	<devicetree-discuss@...ts.ozlabs.org>
Subject: Re: [PATCH v4 1/7] sound: sam9x5_wm8731: machine driver for at91sam9x5
 wm8731 boards

Hi Richard,

On 7/9/2013 22:25, Richard Genoud wrote:
[snip]

> +#include <linux/module.h>
> +#include <linux/moduleparam.h>
> +#include <linux/kernel.h>
> +#include <linux/clk.h>
> +#include <linux/timer.h>
> +#include <linux/interrupt.h>
> +#include <linux/platform_device.h>
> +#include <linux/i2c.h>
> +
> +#include <linux/atmel-ssc.h>
> +
> +#include <sound/core.h>
> +#include <sound/pcm.h>
> +#include <sound/pcm_params.h>
> +#include <sound/soc.h>
> +
> +#include <asm/mach-types.h>
> +#include <mach/hardware.h>
> +#include <mach/gpio.h>
> +
> +#include "../codecs/wm8731.h"
> +#include "atmel-pcm.h"
> +#include "atmel_ssc_dai.h"

I think some of the header file include is not needed. I keep them as 
simple as following:
---8>---
#include <linux/clk.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/pinctrl/consumer.h>

#include <sound/soc.h>

#include "../codecs/wm8731.h"
#include "atmel_ssc_dai.h"
---<8---

> +#define MCLK_RATE 12288000
> +
> +#define DRV_NAME "sam9x5-snd-wm8731"
> +
> +/*
> + * Authorized rates are:
> + * Rate = MCLK_RATE / (n * 2)
> + * Where n is in [1..4095]
> + * (cf register SSC_CMR)
> + */
> +static unsigned int rates[] = {
> +	8000,
> +	16000,
> +	32000,
> +	48000,
> +	64000,
> +	96000,
> +};

This is decided by the codec, while not ssc when ssc in slave mode.

> +static struct snd_pcm_hw_constraint_list hw_rates = {
> +	.count = ARRAY_SIZE(rates),
> +	.list = rates,
> +};
> +

[snip]

> +
> +	at91sam9x5ek_dai.dai_fmt = snd_soc_of_parse_daifmt(np, "atmel,");

We can put this into at91sam9x5ek_dai directly, not need to parse it 
then. example as following:
---8>---
.dai_fmt = SND_SOC_DAIFMT_I2S
                 | SND_SOC_DAIFMT_NB_NF
                 | SND_SOC_DAIFMT_CBM_CFM,
---<8---

Best Regards,
Bo Shen

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