Re: [PATCH] EDB93xx: Add support for CS4271 CODEC on EDB93xx boards

[Mika Westerberg <mika.westerberg@iki.fi>]

On Wed, Feb 02, 2011 at 02:40:53AM +0300, Alexander Sverdlin wrote:
> From: Alexander Sverdlin <subaparts@yandex.ru>
> 
> Add support for CS4271 SPI-connected CODEC on EDB93xx boards.
> Major rework based on code provided by H Hartley Sweeten <hsweeten@visionengravers.com>.
> Tested on EDB9302, others (EDB9301, EDB9302A, EDB9307A, EDB0315A) should work.

One minor comment, see below.

>         
> Signed-off-by: Alexander Sverdlin <subaparts@yandex.ru>
> ---
>  arch/arm/mach-ep93xx/edb93xx.c |  117 ++++++++++++++++++++++++++++++++++++++++
>  1 files changed, 117 insertions(+), 0 deletions(-)
> 
> diff --git a/arch/arm/mach-ep93xx/edb93xx.c b/arch/arm/mach-ep93xx/edb93xx.c
> index 4b04316..f20be96 100644
> --- a/arch/arm/mach-ep93xx/edb93xx.c
> +++ b/arch/arm/mach-ep93xx/edb93xx.c
> @@ -30,12 +30,22 @@
>  #include <linux/gpio.h>
>  #include <linux/i2c.h>
>  #include <linux/i2c-gpio.h>
> +#include <linux/spi/spi.h>
> +#include <linux/delay.h>
> +#include <mach/ep93xx_spi.h>
>  
>  #include <mach/hardware.h>
>  
>  #include <asm/mach-types.h>
>  #include <asm/mach/arch.h>
>  
> +#include <sound/cs4271.h>
> +
> +#define edb93xx_has_audio() (machine_is_edb9301() ||	\
> +			     machine_is_edb9302() ||	\
> +			     machine_is_edb9302a() ||	\
> +			     machine_is_edb9307a() ||	\
> +			     machine_is_edb9315a())
>  
>  static void __init edb93xx_register_flash(void)
>  {
> @@ -93,6 +103,111 @@ static void __init edb93xx_register_i2c(void)
>  
>  
>  /*************************************************************************
> + * EDB93xx SPI peripheral handling
> + *************************************************************************/
> +static int edb93xx_cs4271_hw_setup(struct spi_device *spi)
> +{
> +	int gpio_nreset;
> +	int err;
> +
> +	if (machine_is_edb9301() || machine_is_edb9302()) {
> +		gpio_nreset = EP93XX_GPIO_LINE_EGPIO1;
> +	} else if (machine_is_edb9302a() || machine_is_edb9307a()) {
> +		ep93xx_devcfg_set_bits(EP93XX_SYSCON_DEVCFG_HONIDE);
> +		gpio_nreset = EP93XX_GPIO_LINE_DD2;
> +	} else if (machine_is_edb9315a()) {
> +		gpio_nreset = EP93XX_GPIO_LINE_EGPIO14;
> +	} else {
> +		return -EINVAL;
> +	}
> +
> +	err = gpio_request(gpio_nreset, spi->modalias);
> +	if (err)
> +		return err;
> +	err = gpio_request(EP93XX_GPIO_LINE_EGPIO6, spi->modalias);
> +	if (err)

Should you call gpio_free() for gpio_nreset here?

Regards,
MW

> +		return err;
> +
> +	gpio_direction_output(EP93XX_GPIO_LINE_EGPIO6, 1);
> +
> +	/* Reset codec */
> +	gpio_direction_output(gpio_nreset, 0);
> +	udelay(1);
> +	gpio_set_value(gpio_nreset, 1);
> +	/* Give the codec time to wake up */
> +	udelay(1);
> +
> +	return 0;
> +}