Re: [alsa-devel] [RESEND PATCH v4 1/4] dt-bindings: soundwire: add slave bindings

On 8/22/19 6:37 PM, Srinivas Kandagatla wrote:

This patch adds bindings for Soundwire Slave devices that includes how SoundWire enumeration address and Link ID are used to represented in SoundWire slave device tree nodes.

Signed-off-by: Srinivas Kandagatla srinivas.kandagatla@linaro.org

.../soundwire/soundwire-controller.yaml | 75 +++++++++++++++++++ 1 file changed, 75 insertions(+) create mode 100644 Documentation/devicetree/bindings/soundwire/soundwire-controller.yaml

diff --git a/Documentation/devicetree/bindings/soundwire/soundwire-controller.yaml b/Documentation/devicetree/bindings/soundwire/soundwire-controller.yaml new file mode 100644 index 000000000000..91aa6c6d6266 --- /dev/null +++ b/Documentation/devicetree/bindings/soundwire/soundwire-controller.yaml @@ -0,0 +1,75 @@ +# SPDX-License-Identifier: GPL-2.0 +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/soundwire/soundwire-controller.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml#

+title: SoundWire Controller Generic Binding

+maintainers:

• • Srinivas Kandagatla srinivas.kandagatla@linaro.org

+description: |

• SoundWire busses can be described with a node for the SoundWire controller
• device and a set of child nodes for each SoundWire slave on the bus.

+properties:

• $nodename:
• pattern: "^soundwire(@.*|-[0-9a-f])*$"
• "#address-cells":
• const: 2
• "#size-cells":
• const: 0

+patternProperties:

• "^.*@[0-9a-f]+$":
• type: object
• properties:

•  compatible:
  

•  pattern: "^sdw[0-9][0-9a-f]{4}[0-9a-f]{4}[0-9a-f]{2}$"
  

So is this a 64-bit value, as in the MIPI spec, or is this part of the _ADR description? I also don't get why the first item in in base10?

•  description:
  

•  Is the textual representation of SoundWire Enumeration
  

•  address. compatible string should contain SoundWire Version ID,
  

•  Manufacturer ID, Part ID and Class ID in order and shall be in
  

•  lower-case hexadecimal with leading zeroes.
  

•  Valid sizes of these fields are
  

•  Version ID is 1 nibble, number '0x1' represents SoundWire 1.0
  

•  and '0x2' represents SoundWire 1.1 and so on.
  

•  MFD is 4 nibbles
  

•  PID is 4 nibbles
  

•  CID is 2 nibbles
  

•  More Information on detail of encoding of these fields can be
  

•  found in MIPI Alliance DisCo & SoundWire 1.0 Specifications.
  

•  reg:
  

•    maxItems: 1
  

•    description:
  

•      Instance ID and Link ID of SoundWire Device Address.
  

• required:

•  - compatible
  

•  - reg
  

+examples:

• • |
• soundwire@c2d0000 {

•    #address-cells = <2>;
  

•    #size-cells = <0>;
  

•    compatible = "qcom,soundwire-v1.5.0";
  

•    reg = <0x0c2d0000 0x2000>;
  

•    speaker@1 {
  

•        compatible = "sdw10217201000";
  

•        reg = <1 0>;
  

•    };
  

•    speaker@2 {
  

•        compatible = "sdw10217201000";
  

•        reg = <2 0>;
  

•    };
  

• };

+...