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 23:42:38 +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 23:40, Matthias Kaehlcke wrote:
> On Thu, Aug 02, 2018 at 11:35:54PM +0530, Balakrishna Godavarthi wrote:
>> 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?
> 
> 
> Looks good to me.
> 
> Optionally you could remove the 'Bluetooth wcn3990' part in the
> regulator description, it is a bit redundant since it's already said
> that these are properties for the 'Bluetooth wcn3990' compatible
> string.


Ok. will update the same.

-- 
Regards
Balakrishna.