Re: [PATCH 1/2] counter: Add support for Quadrature x4 with swapped inputs

[William Breathitt Gray <vilhelm.gray@gmail.com>]

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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@kernel.org>
> Signed-off-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>

Acked-by: William Breathitt Gray <vilhelm.gray@gmail.com>

> ---
>  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@vger.kernel.org
> 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
> 

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