2011/6/2 Grant Likely [off-list ref]:

On Wed, Jun 1, 2011 at 1:07 AM, Barry Song [off-list ref] wrote:

quoted

2011/5/28 John Bonesio [off-list ref]:

quoted

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-s3s/WqlpOiPyB63q8FvJNQ@public.gmane.org>
---

 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@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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