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    SubjectRe: [Patch V7 02/10] ASoC: qcom: Document LPASS CPU bindings
    On Thu, Mar 05, 2015 at 12:52:30PM -0600, Kumar Gala wrote:
    >
    > On Mar 3, 2015, at 6:21 PM, Kenneth Westfield <kwestfie@codeaurora.org> wrote:
    >
    > > +++ b/Documentation/devicetree/bindings/sound/qcom,lpass-cpu.txt
    > > @@ -0,0 +1,49 @@
    > > +* Qualcomm Technologies LPASS CPU DAI
    > > +
    > > +Required subnodes:
    > > +
    > > +- qcom,adsp : Audio DSP sub-node
    > > +
    > > +Optional Audio DSP subnode properties:
    > > +
    > > +- status : "disabled" indicates the adsp is not available.
    > > +
    >
    > What is the intent of this subnode?
    >

    From the cover letter:
    Even though the ipq806x LPASS does not contain an audio DSP, other SOCs
    do have one. For those SOCs, the audio DSP typically controls the
    hardware blocks in the LPASS. Hence, different CPU DAI driver(s) would
    need to be used in order to facilitate audio with the DSP. As such, the
    LPASS DT contains an adsp subnode, which is disabled for this SOC. The
    same subnode should be enabled and populated for other SOCs that do
    contain an audio DSP. Not using the audio DSP would require different
    CPU DAI driver(s), in addition to possible bootloader and/or firmware
    changes.

    This was the result of a request from Mark. See here:
    http://thread.gmane.org/gmane.linux.drivers.devicetree/109331/focus=11633

    --
    Kenneth Westfield
    Qualcomm Innovation Center, Inc.
    The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
    a Linux Foundation Collaborative Project


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