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SubjectRe: [PATCH v12 1/7] dt-bindings: net: bluetooth: Add device tree bindings for QTI chip wcn3990
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@codeaurora.org>
>>> Reviewed-by: Rob Herring <robh@kernel.org>
>>> ---
>>> .../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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