linux-kernel - Re: [PATCH v7 2/2] iio: light: Add support for TI OPT4060 color sensor

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Message-ID: <efa8fd22-ca67-4cb1-a8b0-41c86ba58153@kernel.org>
Date: Tue, 26 Nov 2024 15:16:08 +0100
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Per-Daniel Olsson <perdaniel.olsson@...s.com>,
 Jonathan Cameron <jic23@...nel.org>, Lars-Peter Clausen <lars@...afoo.de>,
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>,
 Javier Carrasco <javier.carrasco.cruz@...il.com>
Cc: linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
 devicetree@...r.kernel.org, rickard.andersson@...s.com, kernel@...s.com
Subject: Re: [PATCH v7 2/2] iio: light: Add support for TI OPT4060 color
 sensor

On 26/11/2024 15:00, Per-Daniel Olsson wrote:
> +
> +The driver supports scaled values for red, green and blue. The raw values are
> +scaled so that for a particular test light source, typically white, the
> +measurement intensity is the same across the different color channels. This is
> +calculated in the following way:
> +
> +R = RED_RAW x 2.4
> +G = GREEN_RAW x 1.0
> +B = BLUE_RAW x 1.3
> +
> +The values are accessed from:
> +/sys/bus/iio/devices/iio:deviceX/in_intensity_red_scale
> +/sys/bus/iio/devices/iio:deviceX/in_intensity_green_scale
> +/sys/bus/iio/devices/iio:deviceX/in_intensity_blue_scale
> +
> +The data sheet suggests using the scaled values to normalize the scaled R, G
> +and B values. This is useful to get a value for the ratio between colors
> +independent of light intensity. A userspace appliction can do this in the
> +following way:
> +
> +R_NORMALIZED = R / (R + G + B)
> +G_NORMALIZED = G / (R + G + B)
> +B_NORMALIZED = B / (R + G + B)
> +
> +See section 8.4.5.2 in the data sheet for additional details.
> \ No newline at end of file


You still have patch warnings.

Best regards,
Krzysztof