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

[Balakrishna Godavarthi]

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.