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([2600:8803:e7e4:1d00:c7d5:61e1:68d6:dd54]) by smtp.gmail.com with ESMTPSA id 5614622812f47-42c7b843b74sm1634782b6e.16.2025.07.29.11.51.48 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 29 Jul 2025 11:51:49 -0700 (PDT) Message-ID: Date: Tue, 29 Jul 2025 13:51:48 -0500 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 1/2] iio: magnetometer: add support for Infineon TLV493D 3D Magentic sensor To: Dixit Parmar Cc: Jonathan Cameron , =?UTF-8?Q?Nuno_S=C3=A1?= , Andy Shevchenko , Rob Herring , Krzysztof Kozlowski , Conor Dooley , linux-kernel@vger.kernel.org, linux-iio@vger.kernel.org, devicetree@vger.kernel.org References: <20250726-tlv493d-sensor-v6_16-rc5-v1-0-deac027e6f32@gmail.com> <20250726-tlv493d-sensor-v6_16-rc5-v1-1-deac027e6f32@gmail.com> <141967ee-22f4-4b15-a8da-e8cef25828b4@baylibre.com> Content-Language: en-US From: David Lechner In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit On 7/28/25 10:26 PM, Dixit Parmar wrote: ... >>> + case IIO_CHAN_INFO_SCALE: >>> + switch (chan->type) { >>> + case IIO_MAGN: >>> + /* >>> + * Magnetic field scale: 0.0098 mTesla (i.e. 9.8 µT) >>> + * Expressed as fractional: 98/10 = 9.8 µT. >>> + */ >>> + *val = 98; >>> + *val2 = 10; >> We use SI units, so this needs to be gauss, not tesela. >> > Sure, Is there any documentation/reference this details are mentioned? >>> + return IIO_VAL_FRACTIONAL; Most of the sysfs attribute documentation is in Documentation/ABI/testing/sysfs-bus-iio. Specifically for this case, it says: What: /sys/bus/iio/devices/iio:deviceX/in_magn_x_raw What: /sys/bus/iio/devices/iio:deviceX/in_magn_y_raw What: /sys/bus/iio/devices/iio:deviceX/in_magn_z_raw KernelVersion: 2.6.35 Contact: linux-iio@vger.kernel.org Description: Magnetic field along axis x, y or z (may be arbitrarily assigned). Data converted by application of offset then scale to Gauss.