linux-kernel - Re: [PATCH v5] counter: Introduce the COUNTER_COMP

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Date: Fri, 1 Mar 2024 10:55:39 -0500
From: William Breathitt Gray <william.gray@...aro.org>
To: Fabrice Gasnier <fabrice.gasnier@...s.st.com>
Cc: syednwaris@...il.com, vigneshr@...com, jpanis@...libre.com,
	alexandre.torgue@...s.st.com, linux-iio@...r.kernel.org,
	linux-stm32@...md-mailman.stormreply.com,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5] counter: Introduce the COUNTER_COMP_FREQUENCY() macro

On Fri, Mar 01, 2024 at 11:25:05AM +0100, Fabrice Gasnier wrote:
> Now that there are two users for the "frequency" extension, introduce a
> new COUNTER_COMP_FREQUENCY() macro.
> This extension is intended to be a read-only signal attribute.
> 
> Suggested-by: William Breathitt Gray <william.gray@...aro.org>
> Signed-off-by: Fabrice Gasnier <fabrice.gasnier@...s.st.com>
> ---
> Changes in v5
> - "frequency" extension is read-only, so there's no need to provide
>   a write parameter.
> - patch sent separately from "counter: Add stm32 timer events support" [1]
> [1] https://lore.kernel.org/lkml/20240227173803.53906-2-fabrice.gasnier@foss.st.com/
> ---
>  include/linux/counter.h | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/include/linux/counter.h b/include/linux/counter.h
> index 702e9108bbb4..0ac36f815b7d 100644
> --- a/include/linux/counter.h
> +++ b/include/linux/counter.h
> @@ -602,6 +602,13 @@ struct counter_array {
>  #define COUNTER_COMP_FLOOR(_read, _write) \
>  	COUNTER_COMP_COUNT_U64("floor", _read, _write)
>  
> +#define COUNTER_COMP_FREQUENCY(_read) \
> +{ \
> +	.type = COUNTER_COMP_U64, \
> +	.name = "frequency", \
> +	.signal_u64_read = (_read), \
> +}
> +
>  #define COUNTER_COMP_POLARITY(_read, _write, _available) \
>  { \
>  	.type = COUNTER_COMP_SIGNAL_POLARITY, \
> -- 
> 2.25.1

Hi Fabrice,

Setting the structure members directly works, but why not use
COUNTER_COMP_SIGNAL_U64("frequency", _read, NULL) instead to keep the
code more succinct?

William Breathitt Gray

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