Re: [PATCH v7 2/8] dt-bindings: iio: dac: adi-axi-dac: add ad3552r axi variant

Angelo Dureghello
2024-10-24T09:29:45Z

Hi Conor,

On 22.10.2024 18:22, Conor Dooley wrote:
> On Mon, Oct 21, 2024 at 02:40:12PM +0200, Angelo Dureghello wrote:
> > From: Angelo Dureghello <adureghello@baylibre.com>
> >
> > Add a new compatible and related bindigns for the fpga-based
> > "ad3552r" AXI IP core, a variant of the generic AXI DAC IP.
> >
> > The AXI "ad3552r" IP is a very similar HDL (fpga) variant of the
> > generic AXI "DAC" IP, intended to control ad3552r and similar chips,
> > mainly to reach high speed transfer rates using a QSPI DDR
> > (dobule-data-rate) interface.
> >
> > The ad3552r device is defined as a child of the AXI DAC, that in
> > this case is acting as an SPI controller.
> >
> > Note, #io-backend is present because it is possible (in theory anyway)
> > to use a separate controller for the control path than that used
> > for the datapath.
> >
> > Signed-off-by: Angelo Dureghello <adureghello@baylibre.com>
> > ---
> > .../devicetree/bindings/iio/dac/adi,axi-dac.yaml | 69 +++++++++++++++++++++-
> > 1 file changed, 66 insertions(+), 3 deletions(-)
> >
> > diff --git a/Documentation/devicetree/bindings/iio/dac/adi,axi-dac.yaml b/Documentation/devicetree/bindings/iio/dac/adi,axi-dac.yaml
> > index a55e9bfc66d7..0aabb210f26d 100644
> > --- a/Documentation/devicetree/bindings/iio/dac/adi,axi-dac.yaml
> > +++ b/Documentation/devicetree/bindings/iio/dac/adi,axi-dac.yaml
> > @@ -19,11 +19,13 @@ description: |
> > memory via DMA into the DAC.
> >
> > https://wiki.analog.com/resources/fpga/docs/axi_dac_ip
> > + https://analogdevicesinc.github.io/hdl/library/axi_ad3552r/index.html
> >
> > properties:
> > compatible:
> > enum:
> > - adi,axi-dac-9.1.b
> > + - adi,axi-ad3552r
> >
> > reg:
> > maxItems: 1
> > @@ -36,7 +38,12 @@ properties:
> > - const: tx
> >
> > clocks:
> > - maxItems: 1
> > + minItems: 1
> > + maxItems: 2
> > +
> > + clock-names:
> > + minItems: 1
> > + maxItems: 2
> >
> > '#io-backend-cells':
> > const: 0
> > @@ -47,7 +54,31 @@ required:
> > - reg
> > - clocks
> >
> > -additionalProperties: false
> > +allOf:
> > + - if:
> > + properties:
> > + compatible:
> > + contains:
> > + const: adi,axi-ad3552r
> > + then:
> > + $ref: /schemas/spi/spi-controller.yaml#
> > + properties:
> > + clocks:
> > + minItems: 2
> > + maxItems: 2
>
> Is this maxItems required? It matches the outer maximum.
>
> > + clock-names:
> > + items:
> > + - const: s_axi_aclk
> > + - const: dac_clk
>
> The names are the same in both cases, you can move the definitions
> outside of the if/then/else stuff and only constrain it here.
>
thanks, could you maybe have a look if it's ok now ?
(maxItems not needed for a const list)

clocks:
minItems: 1
maxItems: 2

clock-names:
items:
- const: s_axi_aclk
- const: dac_clk
minItems: 1

'#io-backend-cells':
const: 0

required:
- compatible
- dmas
- reg
- clocks

allOf:
- if:
properties:
compatible:
contains:
const: adi,axi-ad3552r
then:
$ref: /schemas/spi/spi-controller.yaml#
properties:
clocks:
minItems: 2
clock-names:
minItems: 2
else:
properties:
clocks:
maxItems: 1
clock-names:
maxItems: 1

unevaluatedProperties: false

...

> > + else:
> > + properties:
> > + clocks:
> > + maxItems: 1
> > + clock-names:
> > + items:
> > + - const: s_axi_aclk
> > +
> > +unevaluatedProperties: false
> >
> > examples:
> > - |
> > @@ -57,6 +88,38 @@ examples:
> > dmas = <&tx_dma 0>;
> > dma-names = "tx";
> > #io-backend-cells = <0>;
> > - clocks = <&axi_clk>;
> > + clocks = <&clkc 15>;
> > + clock-names = "s_axi_aclk";
> > + };
> > +
> > + - |
> > + #include <dt-bindings/gpio/gpio.h>
> > + axi_dac: spi@44a70000 {
> > + compatible = "adi,axi-ad3552r";
> > + reg = <0x44a70000 0x1000>;
> > + dmas = <&dac_tx_dma 0>;
> > + dma-names = "tx";
> > + #io-backend-cells = <0>;
> > + clocks = <&clkc 15>, <&ref_clk>;
> > + clock-names = "s_axi_aclk", "dac_clk";
> > +
> > + #address-cells = <1>;
> > + #size-cells = <0>;
> > +
> > + dac@0 {
> > + compatible = "adi,ad3552r";
> > + reg = <0>;
> > + reset-gpios = <&gpio0 92 GPIO_ACTIVE_HIGH>;
> > + io-backends = <&axi_dac>;
> > + spi-max-frequency = <20000000>;
> > +
> > + #address-cells = <1>;
> > + #size-cells = <0>;
> > +
> > + channel@0 {
> > + reg = <0>;
> > + adi,output-range-microvolt = <(-10000000) (10000000)>;
> > + };
> > + };
> > };
> > ...
> >
> > --
> > 2.45.0.rc1
> >