[RFC 1/2] ARM:Tegra: Device Tree Support: Initialize the audio card from the device tree.

[Barry Song]

2011/6/2 Grant Likely <grant.likely at secretlab.ca>:
> On Wed, Jun 1, 2011 at 1:07 AM, Barry Song <21cnbao at gmail.com> wrote:
>> 2011/5/28 John Bonesio <bones at secretlab.ca>:
>>> This patch makes it so the top level audio card is initialized from the device
>>> tree. This is just the first step getting the audio complex of devices
>>> iniialized from device tree nodes.
>>>
>>> Signed-off-by: John Bonesio<bones at secretlab.ca>
>>> ---
>>>
>>>  arch/arm/boot/dts/tegra-harmony.dts |    4 +++
>>>  arch/arm/mach-tegra/board-dt.c      |    3 ++
>>>  sound/soc/tegra/harmony.c           |   45 ++++++++++++++++++++++++++++++++---
>>>  3 files changed, 48 insertions(+), 4 deletions(-)
>>>
>>> diff --git a/arch/arm/boot/dts/tegra-harmony.dts b/arch/arm/boot/dts/tegra-harmony.dts
>>> index 05521a5..217a7f0 100644
>>> --- a/arch/arm/boot/dts/tegra-harmony.dts
>>> +++ b/arch/arm/boot/dts/tegra-harmony.dts
>>> @@ -53,6 +53,10 @@
>>>                clock-frequency = <400000>;
>>>        };
>>>
>>> +       harmony_audio: audio_card {
>>> +               compatible = "nvidia,harmony-audio";
>>> +       };
>>> +
>>>        serial at 70006300 {
>>>                status = "ok";
>>>                clock-frequency = < 216000000 >;
>>> diff --git a/arch/arm/mach-tegra/board-dt.c b/arch/arm/mach-tegra/board-dt.c
>>> index c498e84..a569ad9 100644
>>> --- a/arch/arm/mach-tegra/board-dt.c
>>> +++ b/arch/arm/mach-tegra/board-dt.c
>>> @@ -56,6 +56,9 @@ static struct platform_device *tegra250_devices[] __initdata = {
>>>        &tegra_i2c_device2,
>>>        &tegra_i2c_device3,
>>>        &tegra_i2c_device4,
>>> +       &tegra_i2s_device1,
>>> +       &tegra_das_device,
>>> +       &tegra_pcm_device,
>>
>> i am thinking whether platform_device should be created by
>> of_platform_device_create after scanning device tree, but not by
>> hard-code? looks like the two patches are only trying to let device
>> tree deliver gpio to drivers?
>
> Can you please restate your question?  I don't think I understand what
> you are trying to ask.

i mean we don't need to have this platform device registerred by the
old way here. we may get it by matching information in dts and delete
all platform_device and related codes in arch/arm. For example:
dts:
        amba {
                compatible = "simple-bus";
                #address-cells = <1>;
                #size-cells = <1>;
                ranges;

                harmony_audio: audio_card {
                       compatible = "nvidia,harmony-audio";
                       .....
                };
                ....
                ....
       }
then in arch/arm board file, let the platform device registerred automatically:

static struct of_device_id cell_bus_ids[] __initdata = {
        { .compatible = "simple-bus", },
        {},
};

static int __init cell_publish_devices(void)
{
        of_platform_bus_probe(NULL, cell_bus_ids, NULL);

        return 0;
}


>
> g.
>
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