ARM: at91: add atmel tcb capabilities

Some atmel socs have extra tcb capabilities that allow using a generic
clock source or enabling a quadrature decoder.
Signed-off-by: Kamel Bouhara <kamel.bouhara@bootlin.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/20200710230813.1005150-5-alexandre.belloni@bootlin.com

include/soc/at91/atmel_tcb.h

@@ -36,9 +36,14 @@ struct clk;
 /**
  * struct atmel_tcb_config - SoC data for a Timer/Counter Block
  * @counter_width: size in bits of a timer counter register
+ * @has_gclk: boolean indicating if a timer counter has a generic clock
+ * @has_qdec: boolean indicating if a timer counter has a quadrature
+ * decoder.
  */
 struct atmel_tcb_config {
 	size_t	counter_width;
+	bool    has_gclk;
+	bool    has_qdec;
 };
 
 /**