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 <[e-mail]>
Signed-off-by: Alexandre Belloni <[e-mail]>
Signed-off-by: Daniel Lezcano <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

include/soc/at91/atmel_tcb.h

···
 /**
  * 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;
 };
 
 /**