| Message ID | 20190108084132.10214-3-ben.whitten@gmail.com |
|---|---|
| State | Not Applicable |
| Delegated to: | David Miller |
| Headers | show |
| Series | [lora-next,1/4] dt-bindings: lora: sx130x: add basic documentation | expand |
Am 08.01.19 um 09:41 schrieb Ben Whitten: > The sx125x consumes a 32MHz clock and if it is coupled with a sx130x > concentrator may also provide a gated version of this 32MHz for the > concentrator. "SX125x", "SX130x", "32 MHz" > > In the example we connect to output 0 of "txco" clock source. The radio > also provides a single clock output, hence "#clock-cells = <0>", named > "clk32m" for consumption by the sx130x concentrator. No, as pointed out before, output 0 with #clock-cells = <0> is wrong! Either it's 1 and then you can use a single-cell index, or it's 0, in which case that's the next (invalid) clock. > > Signed-off-by: Ben Whitten <ben.whitten@gmail.com> > --- > .../{ => net}/lora/semtech,sx125x.yaml | 27 +++++++++++++++++++ > 1 file changed, 27 insertions(+) > rename Documentation/devicetree/bindings/{ => net}/lora/semtech,sx125x.yaml (67%) > > diff --git a/Documentation/devicetree/bindings/lora/semtech,sx125x.yaml b/Documentation/devicetree/bindings/net/lora/semtech,sx125x.yaml > similarity index 67% > rename from Documentation/devicetree/bindings/lora/semtech,sx125x.yaml > rename to Documentation/devicetree/bindings/net/lora/semtech,sx125x.yaml In wrong patch? > index 5eadec860b70..c2fb4ac06341 100644 > --- a/Documentation/devicetree/bindings/lora/semtech,sx125x.yaml > +++ b/Documentation/devicetree/bindings/net/lora/semtech,sx125x.yaml > @@ -33,13 +33,40 @@ properties: > description: The frequency of the SPI communication to the radio, > in Hz. Maximum SPI frequency is 10MHz. > > + clocks: > + maxItems: 1 > + description: 32MHz clock provider > + > + clock-names: > + items: > + - const: txco The name TCXO and 32 MHz appear to come from the SX1301 manual's reference example? In the SX1257 manual I see XTA/XTB connected to an XTAL, and CLK_IN. Both CLK_IN and CLK_OUT are documented as 36 MHz (page 8). In table 2-4 (page 11) however FXOSC is 32 to 36 MHz, typically 36 MHz; FCLK_IN also has a range of 32 to 36 MHz there. So I guess we should be having two named clocks here and be more permissive in the description? While getting into the hairy details of clock names, we should also prepare optional properties for supply voltages, in case they come from some PMIC that needs a regulator drifer. By my count there's 7 inputs: VBAT1/2/3, VR_PA, VR_ANA1/2, VR_DIG. Do we need a named -supply property for each? > + > + clock-output-names: > + items: > + - const: clk32m > + description: 32MHz output clock name > + > + '#clock-cells': > + const: 0 > + > required: > - compatible > - reg > > examples: > - | > + tcxo: dummy32m { > + compatible = "fixed-clock"; > + clock-frequency = <32000000>; > + clock-output-names = "tcxo"; > + #clock-cells = <0>; > + }; > + > radio0: lora@0 { > compatible = "semtech,sx1257"; > reg = <0>; > + clocks = <&tcxo 0>; just <&tcxo> > + clock-names = "tcxo"; > + clock-output-names = "clk32m"; > + #clock-cells = <0>; > }; > Regards, Andreas
diff --git a/Documentation/devicetree/bindings/lora/semtech,sx125x.yaml b/Documentation/devicetree/bindings/net/lora/semtech,sx125x.yaml similarity index 67% rename from Documentation/devicetree/bindings/lora/semtech,sx125x.yaml rename to Documentation/devicetree/bindings/net/lora/semtech,sx125x.yaml index 5eadec860b70..c2fb4ac06341 100644 --- a/Documentation/devicetree/bindings/lora/semtech,sx125x.yaml +++ b/Documentation/devicetree/bindings/net/lora/semtech,sx125x.yaml @@ -33,13 +33,40 @@ properties: description: The frequency of the SPI communication to the radio, in Hz. Maximum SPI frequency is 10MHz. + clocks: + maxItems: 1 + description: 32MHz clock provider + + clock-names: + items: + - const: txco + + clock-output-names: + items: + - const: clk32m + description: 32MHz output clock name + + '#clock-cells': + const: 0 + required: - compatible - reg examples: - | + tcxo: dummy32m { + compatible = "fixed-clock"; + clock-frequency = <32000000>; + clock-output-names = "tcxo"; + #clock-cells = <0>; + }; + radio0: lora@0 { compatible = "semtech,sx1257"; reg = <0>; + clocks = <&tcxo 0>; + clock-names = "tcxo"; + clock-output-names = "clk32m"; + #clock-cells = <0>; };
The sx125x consumes a 32MHz clock and if it is coupled with a sx130x concentrator may also provide a gated version of this 32MHz for the concentrator. In the example we connect to output 0 of "txco" clock source. The radio also provides a single clock output, hence "#clock-cells = <0>", named "clk32m" for consumption by the sx130x concentrator. Signed-off-by: Ben Whitten <ben.whitten@gmail.com> --- .../{ => net}/lora/semtech,sx125x.yaml | 27 +++++++++++++++++++ 1 file changed, 27 insertions(+) rename Documentation/devicetree/bindings/{ => net}/lora/semtech,sx125x.yaml (67%)