linux-kernel - Re: [PATCH v2 2/2] dt-bindings: trivial-devices: Add qca,qca4024

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Date: Thu, 15 Feb 2024 23:01:00 +0100
From: frut3k7 <frut3k7@...il.com>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc: Rob Herring <robh+dt@...nel.org>, Robert Marko <robimarko@...il.com>, 
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>, 
	Mark Brown <broonie@...nel.org>, Guenter Roeck <linux@...ck-us.net>, 
	Peter Yin <peteryin.openbmc@...il.com>, 
	Patrick Rudolph <patrick.rudolph@...ements.com>, Michal Simek <michal.simek@....com>, 
	Marek Vasut <marex@...x.de>, Luca Ceresoli <luca.ceresoli@...tlin.com>, 
	Bjorn Helgaas <bhelgaas@...gle.com>, Lukas Wunner <lukas@...ner.de>, Fabio Estevam <festevam@...x.de>, 
	Alexander Stein <alexander.stein@...tq-group.com>, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-spi@...r.kernel.org
Subject: Re: [PATCH v2 2/2] dt-bindings: trivial-devices: Add qca,qca4024

The device I use has the QCA4024 chip connected via the spi controller:
        blsp1_spi4: spi@...8000 {
            compatible = "qcom,spi-qup-v2.2.1";
            #address-cells = <1>;
            #size-cells = <0>;
            reg = <0x78b8000 0x600>;
            interrupts = <GIC_SPI 98 IRQ_TYPE_LEVEL_HIGH>;
            clocks = <&gcc GCC_BLSP1_QUP4_SPI_APPS_CLK>,
                 <&gcc GCC_BLSP1_AHB_CLK>;
            clock-names = "core", "iface";
            dmas = <&blsp_dma 18>, <&blsp_dma 19>;
            dma-names = "tx", "rx";
            status = "disabled";
        };

and apart from setting the frequency and gpio there is nothing else:
        &blsp1_spi4 {
            status = "okay";

            pinctrl-0 = <&spi_3_pins &quartz_pins>;
            pinctrl-names = "default";

            /* Qualcomm QCA4024 IoT */
            iot@3 {
                compatible = "qca,qca4024";
                reg = <0>;
                spi-max-frequency = <24000000>;
            };
        };

        &tlmm {
            spi_3_pins: spi-3-state {
                spi-pins {
                    pins = "gpio50", "gpio52", "gpio53";
                    function = "blsp3_spi";
                    drive-strength = <8>;
                    bias-disable;
                };

                cs-pins {
                    pins = "gpio22";
                    function = "blsp3_spi2";
                    drive-strength = <8>;
                    bias-disable;
                };
            };

            quartz_pins: quartz-state {
                interrupt-pins {
                    pins = "gpio48";
                    function = "gpio";
                    bias-disable;
                    input;
                };

                reset-pins {
                    pins = "gpio21";
                    function = "gpio";
                    bias-disable;
                    output-high;
                };
            };
        };

On Thu, Feb 8, 2024 at 8:32 AM Krzysztof Kozlowski
<krzysztof.kozlowski@...aro.org> wrote:
>
> On 07/02/2024 23:45, Paweł Owoc wrote:
> > Add Qualcomm QCA4024 to trivial devices.
> >
> > Signed-off-by: Paweł Owoc <frut3k7@...il.com>
> > ---
> >  Documentation/devicetree/bindings/trivial-devices.yaml | 2 ++
> >  1 file changed, 2 insertions(+)
> >
> > diff --git a/Documentation/devicetree/bindings/trivial-devices.yaml b/Documentation/devicetree/bindings/trivial-devices.yaml
> > index 79dcd92c4a43..c6362e981920 100644
> > --- a/Documentation/devicetree/bindings/trivial-devices.yaml
> > +++ b/Documentation/devicetree/bindings/trivial-devices.yaml
> > @@ -309,6 +309,8 @@ properties:
> >            - plx,pex8648
> >              # Pulsedlight LIDAR range-finding sensor
> >            - pulsedlight,lidar-lite-v2
> > +            # Qualcomm QCA4024 Multi-mode Bluetooth and 802.15.4 SoC
> > +          - qca,qca4024
>
>
> As I wrote, Bluetooth chip is not a trivial device. This one
> particular exposes several interfaces to the host, needs a clock and
> power supply.
>
> Best regards,
> Krzysztof
>