[PATCH v4 4/5] dt-bindings: counter: microchip-tcb-capture counter
From: Kamel Bouhara <kamel.bouhara@bootlin.com>
Date: 2020-05-11 14:05:34
Also in:
linux-devicetree, linux-iio, linux-input
Subsystem:
microchip soc drivers, open firmware and flattened device tree bindings, the rest · Maintainers:
Conor Dooley, Rob Herring, Krzysztof Kozlowski, Linus Torvalds
Describe the devicetree binding for the Microchip TCB module. Each counter blocks exposes three independent counters. However, when configured in quadrature decoder, both channel <0> and <1> are required for speed/position and rotation capture (yet only the position is captured). Signed-off-by: Kamel Bouhara <kamel.bouhara@bootlin.com> --- .../soc/microchip/atmel,at91rm9200-tcb.yaml | 29 +++++++++++++++++-- 1 file changed, 26 insertions(+), 3 deletions(-)
diff --git a/Documentation/devicetree/bindings/soc/microchip/atmel,at91rm9200-tcb.yaml b/Documentation/devicetree/bindings/soc/microchip/atmel,at91rm9200-tcb.yaml
index 38403760f64d..0bd7b14a1552 100644
--- a/Documentation/devicetree/bindings/soc/microchip/atmel,at91rm9200-tcb.yaml
+++ b/Documentation/devicetree/bindings/soc/microchip/atmel,at91rm9200-tcb.yaml@@ -52,14 +52,20 @@ properties: patternProperties: "^timer@[0-2]$": - description: The timer block channels that are used as timers. + description: The timer block channels that are used as timers or counters. type: object properties: compatible: - const: atmel,tcb-timer + items: + - enum: + - atmel,tcb-timer + - microchip,tcb-capture reg: description: - List of channels to use for this particular timer. + List of channels to use for this particular timer. In Microchip TCB capture + mode channels are registered as a counter devices, for the qdec mode TCB0's + channel <0> and <1> are required. + minItems: 1 maxItems: 3
@@ -148,3 +154,20 @@ examples: reg = <1>; }; }; +examples: + - | + /* TCB Capture with qdec mode: */ + tcb0: timer@fff7c000 { + compatible = "atmel,at91rm9200-tcb", "simple-mfd", "syscon"; + #address-cells = <1>; + #size-cells = <0>; + reg = <0xfff7c000 0x100>; + interrupts = <18 4>; + clocks = <&tcb0_clk>, <&clk32k>; + clock-names = "t0_clk", "slow_clk"; + + timer@0 { + compatible = "atmel,tcb-capture"; + reg = <0>, <1>; + }; + };
--
2.25.0
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