On 22/02/18 10:03, Srinivas Kandagatla wrote:
Also the versions of each service are independent to each other.
Not sure I follow the last statement. Meaning firmware updates change
the services?
Sorry for not being clear, so the services like AFE, ASM, ADM have
different version numbers for a given SoC/firmware.
Not 100% sure if firmware updates would change the service version
number, even if it does, it can be queried dynamically on new B family
SoCs, and on older A Family SoCs I have not seen the firmware updates in
last 4 years.
I don't see any versioning of services here.
Yes, Plan is that it will be part of the compatible string in cases
where version query is not supported on older QCOM A family SoCs.
On B Family SoCs we can query the version dynamically.
apr {
compatible = "qcom,apr-v2";
qcom,smd-channels = "apr_audio_svc";
qcom,apr-dest-domain-id = <APR_DOMAIN_ADSP>;
apr-services {
q6core {
qcom,apr-svc-name = "CORE";
qcom,apr-svc-id = <APR_SVC_ADSP_CORE>;
compatible = "qcom,q6core";
};
q6afe: q6afe {
compatible = "qcom,q6afe";
qcom,apr-svc-name = "AFE";
qcom,apr-svc-id = <APR_SVC_AFE>;
#sound-dai-cells = <1>;
};
q6asm: q6asm {
compatible = "qcom,q6asm";
qcom,apr-svc-name = "ASM";
qcom,apr-svc-id = <APR_SVC_ASM>;
#sound-dai-cells = <1>;
};
q6adm: q6adm {, "external-sleep"
compatible = "qcom,q6adm";
qcom,apr-svc-name = "ADM";
qcom,apr-svc-id = <APR_SVC_ADM>;
#sound-dai-cells = <0>;
};
All these DAI nodes could be a single node and the cell value be the
svc-id?
So we will have 2 cell values, one representing the apr service and
other the dai.
No, DAI's here are both backends and frontends, and some of the services
like core, USM are not DAI's
Are you also saying that we should have a single driver entity for
all these
services?
DT nodes do not equate driver entities. A driver can instantiate other
drivers.
Am I saying a single DT node for this? Yes, perhaps.
Yes, I will give that a go.
I did try your suggestion of making audio services into a single node
and it ended up more messy and non scalable.
Mainly because q6afe node has more than one interface type of backend
dais (child nodes).
Each of this backend dai may need board specific setting ex: MI2S case
where board could wire up specific tx and rx lines from 4 possible lines
for that board. Also other type of dais also have some interface
specific properties.
MI2S example:
apr {
...
q6afe: q6afe {
compatible = "qcom,q6afe";
qcom,apr-svc-name = "AFE";
qcom,apr-svc-id = <APR_SVC_AFE>;
pinctrl-0 = <&ext_sec_tlmm_lines_act>;
pinctrl-names = "default";
#sound-dai-cells = <1>;
mi2s_prim_rx_dai@34{
reg = <34>;
rx-lines = <0>;
...
};
mi2s_prim_tx_dai@35{
reg = <35>;
tx-lines = <1 2>
...
};
...
};
};
Here is block diagram to give a quick overview of the components
+---------+ +---------+ +---------+
| q6asm | |q6routing| | q6afe |
| fedai | <------> | mixers | <-----> | bedai |
+---------+ +---------+ +---------+
^ ^ ^
| | |
| +------------------+----------------+ |
| | | | |
v v v v v
+---------+ +---------+ +---------+
| q6ASM | | q6ADM | | q6AFE |
+---------+ +---------+ +---------+
^ ^ ^ ^
| | | CPU Side |
------+---------------------+-------------------+--------
| | |
|APR |APR |APR
| | |
| +------------------+----------------+ |
| | | | |
+-----+--+-----------------------------------+--+-------
| | | | | QDSP Side |
v v v v v v
+---------+ +---------+ +---------+
| ASM | <------> | ADM | <-----> | AFE |
+---------+ +---------+ +---------+
^
|
+-------------------+
|
---------------------------+--------------------------
| Audio I/O |
v v
+--------------------------------------------------+
| Audio devices |
| CODEC | HDMI-TX | PCM | SLIMBUS | I2S |MI2S |...|
| |
+--------------------------------------------------+
thanks,
srini
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