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 11:30:24 +0200
From:	Richard Genoud <richard.genoud@...il.com>
To:	Bo Shen <voice.shen@...el.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

2013/7/10 Bo Shen <voice.shen@...el.com>:
> Hi Richard,
Hi !

> 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---
ooopps ! I forgot to do some cleaning in those after the file rework. Thanks !

>
>> +#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.
yes.

>> +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---
yes, I removed that for the older machine driver, without thinking that much.
It's better hardcorded like that.


Thanks for your comments !
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