linux-kernel - Re: [PATCH v5 2/8] iio: core: add fixed point parsing with 64-bit parts

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Message-ID: <3rtccxcqpxkwq54jjbl7l6rq3xm3ibsnlh5s7hiymo4okir7dg@ky43houswpjg>
Date: Fri, 23 Jan 2026 16:14:33 +0000
From: Rodrigo Alencar <455.rodrigo.alencar@...il.com>
To: rodrigo.alencar@...log.com, linux-kernel@...r.kernel.org, 
	linux-iio@...r.kernel.org, devicetree@...r.kernel.org, linux-doc@...r.kernel.org
Cc: Jonathan Cameron <jic23@...nel.org>, 
	David Lechner <dlechner@...libre.com>, Andy Shevchenko <andy@...nel.org>, 
	Lars-Peter Clausen <lars@...afoo.de>, Michael Hennerich <Michael.Hennerich@...log.com>, 
	Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
	Conor Dooley <conor+dt@...nel.org>, Jonathan Corbet <corbet@....net>
Subject: Re: [PATCH v5 2/8] iio: core: add fixed point parsing with 64-bit
 parts

On 26/01/23 03:53PM, Rodrigo Alencar via B4 Relay wrote:
> From: Rodrigo Alencar <rodrigo.alencar@...log.com>
> 
> Add iio_str_to_fixpoint64() function that leverages simple_strtoull()
> to parse numbers from a string.
> A helper function __iio_str_to_fixpoint64() replaces
> __iio_str_to_fixpoint() implementation, extending its usage for
> 64-bit fixed-point parsing.
> 
> Signed-off-by: Rodrigo Alencar <rodrigo.alencar@...log.com>

...
> +static int __iio_str_to_fixpoint64(const char *str, u64 fract_mult,
> +				   s64 *integer, s64 *fract, bool scale_db)
> +{
> +	u64 i = 0, f = 0;
> +	char *end;
> +	int digit_count, precision = ffs(fract_mult);

I've just noted that I should have used ffs64() here. 

kind regards,

Rodrigo Alencar