Re: [PATCH v12 1/7] dt-bindings: net: bluetooth: Add device tree bindings for QTI chip wcn3990

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Hi Matthias,

On 2018-08-02 23:24, Balakrishna Godavarthi wrote:
Hi Matthias,

On 2018-08-02 22:50, Matthias Kaehlcke wrote:
On Thu, Aug 02, 2018 at 06:55:12PM +0530, Balakrishna Godavarthi wrote:
This patch enables regulators for the Qualcomm Bluetooth wcn3990
controller.

Signed-off-by: Balakrishna Godavarthi <bgodavar@xxxxxxxxxxxxxx>
Reviewed-by: Rob Herring <robh@xxxxxxxxxx>
---
.../bindings/net/qualcomm-bluetooth.txt | 26 +++++++++++++++++--
 1 file changed, 24 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/net/qualcomm-bluetooth.txt b/Documentation/devicetree/bindings/net/qualcomm-bluetooth.txt
index 0ea18a53cc29..2175174415ee 100644
--- a/Documentation/devicetree/bindings/net/qualcomm-bluetooth.txt
+++ b/Documentation/devicetree/bindings/net/qualcomm-bluetooth.txt
@@ -10,12 +10,22 @@ device the slave device is attached to.
 Required properties:
  - compatible: should contain one of the following:
    * "qcom,qca6174-bt"
+   * "qcom,wcn3990-bt"
+
+Optional properties for compatible string qcom,qca6174-bt:

-Optional properties:
  - enable-gpios: gpio specifier used to enable chip
  - clocks: clock provided to the controller (SUSCLK_32KHZ)

-Example:
+Optional properties for compatible string qcom,wcn3990-bt:
+
+ - vddio-supply: Bluetooth wcn3990 VDD_IO supply regulator handle.
+ - vddxo-supply: Bluetooth wcn3990 VDD_XO supply regulator handle.
+ - vddrf-supply: Bluetooth wcn3990 VDD_RF supply regulator handle.
+ - vddch0-supply: Bluetooth wcn3990 VDD_CH0 supply regulator handle.

Are these really optional? If I understand correctly the driver
expects the regulators to be there. Even if it could do with only some
regulators specified the devm_regulator_bulk_get() call would fail if
not all requested regulators are available.

yes they are required along with compatible string "qcom,wcn3990-bt".
i have taken reference wrt compatible string "qcom,qca6174-bt".
In which clocks and enable-gpios are required for driver to work, but
it was written as optional in doc.

below snippet from hci_qca.c for qcom,qca6174-bt.

 if (IS_ERR(qcadev->bt_en)) {
       dev_err(&serdev->dev, "failed to acquire enable gpio\n");
       return PTR_ERR(qcadev->bt_en);
    }

  qcadev->susclk = devm_clk_get(&serdev->dev, NULL);
  if (IS_ERR(qcadev->susclk)) {
      dev_err(&serdev->dev, "failed to acquire clk\n");
       return PTR_ERR(qcadev->susclk);
     }

technically it is not correct then i will update as below

Required properties for compatible string qcom,wcn3990-bt:

 - vddio-supply: Bluetooth wcn3990 VDD_IO supply regulator handle.
 - vddxo-supply: Bluetooth wcn3990 VDD_XO supply regulator handle.
 - vddrf-supply: Bluetooth wcn3990 VDD_RF supply regulator handle.
 - vddch0-supply: Bluetooth wcn3990 VDD_CH0 supply regulator handle.

Optional properties for compatible string qcom,wcn3990-bt:

- max-speed: see Documentation/devicetree/bindings/serial/slave-device.txt

are they above ok?

--
Regards
Balakrishna.
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