On Tue, Jan 16, 2018 at 10:25:58PM -0800, Bjorn Andersson wrote:
> On Fri 12 Jan 17:05 PST 2018, Karthikeyan Ramasubramanian wrote:
>
> > Add device tree binding support for the QCOM GENI SE driver.
> >
> > Signed-off-by: Karthikeyan Ramasubramanian <kramasub@xxxxxxxxxxxxxx>
>
> Better describe the entire GENI, with it's functions in the same
> binding.
>
> > ---
> > .../devicetree/bindings/soc/qcom/qcom,geni-se.txt | 34 ++++++++++++++++++++++
> > 1 file changed, 34 insertions(+)
> > create mode 100644 Documentation/devicetree/bindings/soc/qcom/qcom,geni-se.txt
> >
> > diff --git a/Documentation/devicetree/bindings/soc/qcom/qcom,geni-se.txt b/Documentation/devicetree/bindings/soc/qcom/qcom,geni-se.txt
> > new file mode 100644
> > index 0000000..66f8a16
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/soc/qcom/qcom,geni-se.txt
> > @@ -0,0 +1,34 @@
> > +Qualcomm Technologies, Inc. GENI Serial Engine QUP Wrapper Controller
> > +
> > +Generic Interface (GENI) based Qualcomm Universal Peripheral (QUP) wrapper
> > +is a programmable module for supporting a wide range of serial interfaces
> > +like UART, SPI, I2C, I3C, etc. A single QUP module can provide upto 8 Serial
> > +Interfaces, using its internal Serial Engines. The GENI Serial Engine QUP
> > +Wrapper controller is modeled as a node with zero or more child nodes each
> > +representing a serial engine.
> > +
> > +Required properties:
> > +- compatible: Must be "qcom,geni-se-qup".
> > +- reg: Must contain QUP register address and length.
> > +- clock-names: Must contain "m-ahb" and "s-ahb".
> > +- clocks: AHB clocks needed by the device.
> > +
> > +Required properties if child node exists:
> > +- #address-cells: Must be 1
> > +- #size-cells: Must be 1
>
> But on a 64-bit system, shouldn't these be 2?
No, depends on the bus and ranges. It annoys me to no end that folks
needlessly use 2 cells when the perpheral address space and/or module
sizes don't exceed 4G.
>
> > +- ranges: Must be present
And ideally with a value, but that's beyond the scope of the binding.
> > +
> > +Properties for children:
> > +
> > +A GENI based QUP wrapper controller node can contain 0 or more child nodes
> > +representing serial devices. These serial devices can be a QCOM UART, I2C
> > +controller, spi controller, or some combination of aforementioned devices.
> > +
> > +Example:
> > + qup0: qcom,geniqup0@8c0000 {
>
> I don't see a reason for this to be referenced, so skip the label. And
> don't use qcom, in the node name; "geni" would be perfectly fine?
>
> > + compatible = "qcom,geni-se-qup";
> > + reg = <0x8c0000 0x6000>;
> > + clock-names = "m-ahb", "s-ahb";
> > + clocks = <&clock_gcc GCC_QUPV3_WRAP_0_M_AHB_CLK>,
> > + <&clock_gcc GCC_QUPV3_WRAP_0_S_AHB_CLK>;
> > + }
>
> Regards,
> Bjorn
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