On Thu, Apr 01, 2021 at 06:32:27PM +0300, Jarkko Nikula wrote:
> Some Quadrature Encoders can swap phase inputs A and B internally. This
> new function will allow drivers to configure input swap mode.
>
> This was implemented by Felipe Balbi while he was working at Intel.
>
> Signed-off-by: Felipe Balbi (Intel) <balbi@xxxxxxxxxx>
> Signed-off-by: Jarkko Nikula <jarkko.nikula@xxxxxxxxxxxxxxx>
Acked-by: William Breathitt Gray <vilhelm.gray@xxxxxxxxx>
> ---
> Documentation/ABI/testing/sysfs-bus-counter | 4 ++++
> drivers/counter/counter.c | 3 ++-
> include/linux/counter.h | 3 ++-
> 3 files changed, 8 insertions(+), 2 deletions(-)
>
> diff --git a/Documentation/ABI/testing/sysfs-bus-counter b/Documentation/ABI/testing/sysfs-bus-counter
> index 566bd99fe0a5..8f1e3de88c77 100644
> --- a/Documentation/ABI/testing/sysfs-bus-counter
> +++ b/Documentation/ABI/testing/sysfs-bus-counter
> @@ -146,6 +146,10 @@ Description:
> updates the respective count. Quadrature encoding
> determines the direction.
>
> + quadrature x4 swapped:
> + Same as quadrature x4, however Phase A and Phase B
> + signals are swapped.
> +
> What: /sys/bus/counter/devices/counterX/countY/name
> KernelVersion: 5.2
> Contact: linux-iio@xxxxxxxxxxxxxxx
> diff --git a/drivers/counter/counter.c b/drivers/counter/counter.c
> index 6a683d086008..11d357245b14 100644
> --- a/drivers/counter/counter.c
> +++ b/drivers/counter/counter.c
> @@ -752,7 +752,8 @@ static const char *const counter_count_function_str[] = {
> [COUNTER_COUNT_FUNCTION_QUADRATURE_X1_B] = "quadrature x1 b",
> [COUNTER_COUNT_FUNCTION_QUADRATURE_X2_A] = "quadrature x2 a",
> [COUNTER_COUNT_FUNCTION_QUADRATURE_X2_B] = "quadrature x2 b",
> - [COUNTER_COUNT_FUNCTION_QUADRATURE_X4] = "quadrature x4"
> + [COUNTER_COUNT_FUNCTION_QUADRATURE_X4] = "quadrature x4",
> + [COUNTER_COUNT_FUNCTION_QUADRATURE_X4_SWAPPED] = "quadrature x4 swapped"
> };
>
> static ssize_t counter_function_show(struct device *dev,
> diff --git a/include/linux/counter.h b/include/linux/counter.h
> index 9dbd5df4cd34..c3b4d263eb22 100644
> --- a/include/linux/counter.h
> +++ b/include/linux/counter.h
> @@ -170,7 +170,8 @@ enum counter_count_function {
> COUNTER_COUNT_FUNCTION_QUADRATURE_X1_B,
> COUNTER_COUNT_FUNCTION_QUADRATURE_X2_A,
> COUNTER_COUNT_FUNCTION_QUADRATURE_X2_B,
> - COUNTER_COUNT_FUNCTION_QUADRATURE_X4
> + COUNTER_COUNT_FUNCTION_QUADRATURE_X4,
> + COUNTER_COUNT_FUNCTION_QUADRATURE_X4_SWAPPED,
> };
>
> /**
> --
> 2.30.2
>
Attachment:
signature.asc
Description: PGP signature
