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

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Date:   Thu, 02 Aug 2018 23:35:54 +0530
From:   Balakrishna Godavarthi <bgodavar@...eaurora.org>
To:     Matthias Kaehlcke <mka@...omium.org>
Cc:     marcel@...tmann.org, johan.hedberg@...il.com,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-bluetooth@...r.kernel.org, thierry.escande@...aro.org,
        rtatiya@...eaurora.org, hemantg@...eaurora.org,
        linux-arm-msm@...r.kernel.org
Subject: Re: [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@...eaurora.org>
>>> Reviewed-by: Rob Herring <robh@...nel.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.