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List:       linux-sound
Subject:    Re: [alsa-devel] [PATCH] ASoC: wm8731: let codec to manage clock by itself
From:       Bo Shen <voice.shen () atmel ! com>
Date:       2015-03-02 2:00:19
Message-ID: 54F3C433.3000400 () atmel ! com
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On 02/16/2015 08:58 PM, Manuel Lauss wrote:
> On Mon, Feb 16, 2015 at 11:31 AM, Charles Keepax
> <ckeepax@opensource.wolfsonmicro.com> wrote:
>> On Thu, Feb 12, 2015 at 04:23:06PM +0800, Bo Shen wrote:
>>> Hi All,
>>>
>>> On 02/05/2015 03:35 PM, Bo Shen wrote:
>>>> Let the wm8731 codec to manage clock by itself.
>>>>
>>>> Signed-off-by: Bo Shen <voice.shen@atmel.com>
>>>> ---
>>>>
>>>>    sound/soc/codecs/wm8731.c | 28 ++++++++++++++++++++++++++++
>>>>    1 file changed, 28 insertions(+)
>>>
>>> Any comments for this patch (aka ping?)
>>
>> I preferred the idea of having the clock as optional and from the
>> discussion on the last patch it didn't look too tricky to
>
> me too

OK, I will keep the clock as optional.

>> achieve. OTOH I think the Atmel system is the only one that uses
>> both this CODEC and common clock so it doesn't look like this
>> would cause any problems, but might be nice for this not to be
>> one more thing for someone to fix up when moving a system to
>> common clock.
>
> Not quite, there's one MIPS platform I maintain which needs a patch
> like the one below (tested):

Do I need to seed the following patch together or you send it?

> diff --git a/arch/mips/alchemy/devboards/db1200.c
> b/arch/mips/alchemy/devboards/db1200.c
> index 8c13675..aa01ab2 100644
> --- a/arch/mips/alchemy/devboards/db1200.c
> +++ b/arch/mips/alchemy/devboards/db1200.c
> @@ -19,6 +19,8 @@
>    */
>
>   #include <linux/clk.h>
> +#include <linux/clkdev.h>
> +#include <linux/clk-provider.h>
>   #include <linux/dma-mapping.h>
>   #include <linux/gpio.h>
>   #include <linux/i2c.h>
> @@ -862,6 +864,12 @@ int __init db1200_dev_setup(void)
>       irq_set_status_flags(DB1200_PC1_INSERT_INT, IRQ_NOAUTOEN);
>       irq_set_status_flags(DB1200_PC1_EJECT_INT, IRQ_NOAUTOEN);
>
> +    /* register the 12MHz crystal for the WM8731 I2S codec */
> +    c = clk_register_fixed_rate(NULL, "wm8731xtal", NULL,
> +                    CLK_IS_ROOT, 12000000);
> +    if (!IS_ERR(c))
> +        clk_register_clkdev(c, "mclk", "0-001b");
> +
>       i2c_register_board_info(0, db1200_i2c_devs,
>                   ARRAY_SIZE(db1200_i2c_devs));
>       spi_register_board_info(db1200_spi_devs,
> diff --git a/arch/mips/alchemy/devboards/db1300.c
> b/arch/mips/alchemy/devboards/db1300.c
> index 1c64fdb..1aa01c8 100644
> --- a/arch/mips/alchemy/devboards/db1300.c
> +++ b/arch/mips/alchemy/devboards/db1300.c
> @@ -5,6 +5,8 @@
>    */
>
>   #include <linux/clk.h>
> +#include <linux/clkdev.h>
> +#include <linux/clk-provider.h>
>   #include <linux/dma-mapping.h>
>   #include <linux/gpio.h>
>   #include <linux/gpio_keys.h>
> @@ -799,6 +801,12 @@ int __init db1300_dev_setup(void)
>       if (platform_driver_register(&db1300_wm97xx_driver))
>           pr_warn("DB1300: failed to init touch pen irq support!\n");
>
> +    /* register the 12MHz crystal for the WM8731 I2S codec */
> +    c = clk_register_fixed_rate(NULL, "wm8731xtal", NULL,
> +                    CLK_IS_ROOT, 12000000);
> +    if (!IS_ERR(c))
> +        clk_register_clkdev(c, "mclk", "0-001b");
> +
>       /* Audio PSC clock is supplied by codecs (PSC1, 2) */
>       __raw_writel(PSC_SEL_CLK_SERCLK,
>           (void __iomem *)KSEG1ADDR(AU1300_PSC1_PHYS_ADDR) + PSC_SEL_OFFSET);
>

Best Regards,
Bo Shen
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