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SubjectRe: [PATCH v7 2/4] soc: qcom: Add AOSS QMP driver
On 5/1/2019 10:07 AM, Bjorn Andersson wrote:
> The Always On Subsystem (AOSS) Qualcomm Messaging Protocol (QMP) driver
> is used to communicate with the AOSS for certain side-channel requests,
> that are not available through the RPMh interface.
> The communication is a very simple synchronous mechanism of messages
> being written in message RAM and a doorbell in the AOSS is rung. As the
> AOSS has processed the message length is cleared and an interrupt is
> fired by the AOSS as acknowledgment.
> The driver exposes the QDSS clock as a clock and the low-power state
> associated with the remoteprocs in the system as a set of power-domains.
> Signed-off-by: Bjorn Andersson <>
> ---
> Changes since v6:
> - Squash the pd into the same driver as the communication, to simplify
> the interaction.
> - Representing the QDSS clocks as a clock/power domain turns out to
> cascade into a request to make all Coresight drivers have a secondary
> compatible to replace the required bus clock with a required power
> domain. So in v7 this is exposed as a clock instead.
> - Some error checking updates, as reported by Doug.

Thanks for the patch Bjorn.
Tested the QDSS functionality on SDM845 based Cheza board with this
change and it works just fine.

Tested-by: Sai Prakash Ranjan <>

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