I'm working on ALSA ASoC support for a codec chip on my mpc5200 based target hardware. How should the codec be represented in the device tree?
Under ASoC the device drivers for the codec chips are platform independent. In the current ASoC model there are three device drivers: i2s (or spi, etc), the generic codec, and a platform specific 'fabric' driver. Some codecs are linked to both i2c and i2s. The fabric driver corresponds to the 'layout-id' in the Apple model. It tells how to configure the generic codec driver for the specific configuration needed by the actual platform hardware. For development purposes I'm using an Efika as a target platform. It is easy enough to load the i2s driver using the device tree. I can add entries to the i2s node to trigger loading of the generic sta9766 codec driver. How do I trigger loading the Efika specific fabric driver? My target hardware has a codec that is linked to both i2s and i2c. How should it be represented? Apple has three entries. One for i2s, one for the codec, and one for soundchip. What is the soundchip entry, does it correspond to real hardware? /proc/device-tree/[EMAIL PROTECTED]/[EMAIL PROTECTED]/[EMAIL PROTECTED]/[EMAIL PROTECTED]: name "i2s-a" device_type "soundbus" compatible "i2sbus" built-in reg 00010000 00001000 00008000 00000100 00008100 00000100 interrupts 0000001e 00000001 00000001 00000000 00000002 00000000 interrupt-parent ff981a38 platform-headphone-mute ff9828a0 platform-amp-mute ff9829f8 platform-hw-reset ff982b48 platform-linein-detect ff982c98 platform-headphone-detect ff982e58 platform-get-enable ff97c3b0 platform-enable ff97c3b0 platform-disable ff97c3b0 platform-get-clock-enable ff97c3b0 platform-clock-enable ff97c3b0 platform-clock-disable ff97c3b0 platform-get-sw-reset ff97c3b0 platform-clear-sw-reset ff97c3b0 platform-sw-reset ff97c3b0 platform-get-cell-enable ff97c3b0 platform-cell-enable ff97c3b0 platform-cell-disable ff97c3b0 linux,phandle ff985b88 /proc/device-tree/[EMAIL PROTECTED]/[EMAIL PROTECTED]/[EMAIL PROTECTED]/[EMAIL PROTECTED]/sound: name "sound" device_type "soundchip" compatible "AOAbase" built-in layout-id 00000046 (70) object-model-version 00000002 vendor-id 0000106b (4203) platform-tas-codec-ref ff98cba8 linux,phandle ff985d48 /proc/device-tree/[EMAIL PROTECTED]/[EMAIL PROTECTED]/[EMAIL PROTECTED]/[EMAIL PROTECTED]/[EMAIL PROTECTED]: name "codec" device_type "codec" compatible "tas3004" "codec" "" reg 0000006a (106) built-in platform-do-tas-codec-ref ff985d48 08000000 00000027 linux,phandle ff98cba8 -- Jon Smirl [EMAIL PROTECTED] _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev