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[82.56.170.15]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3912bfba8a9sm15597038f8f.9.2025.03.10.10.41.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 10 Mar 2025 10:41:11 -0700 (PDT) From: Angelo Dureghello X-Google-Original-From: Angelo Dureghello Date: Mon, 10 Mar 2025 18:39:53 +0100 Subject: [PATCH v4 2/2] doc: iio: ad7380: describe offload support Precedence: bulk X-Mailing-List: linux-iio@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20250310-wip-bl-spi-offload-ad7380-v4-2-b184b37b7c72@baylibre.com> References: <20250310-wip-bl-spi-offload-ad7380-v4-0-b184b37b7c72@baylibre.com> In-Reply-To: <20250310-wip-bl-spi-offload-ad7380-v4-0-b184b37b7c72@baylibre.com> To: Jonathan Cameron , Lars-Peter Clausen , Michael Hennerich , =?utf-8?q?Nuno_S=C3=A1?= , David Lechner , Jonathan Corbet Cc: linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, Angelo Dureghello X-Mailer: b4 0.14.2 From: Angelo Dureghello Add a section to the ad7380 documentation describing how to use the driver with SPI offloading. Signed-off-by: Angelo Dureghello --- Documentation/iio/ad7380.rst | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/Documentation/iio/ad7380.rst b/Documentation/iio/ad7380.rst index 35232a0e3ad730c19b5201b74280bdb6deaa9667..24a92a1c4371db6b59ef47edf06cee860641ebbf 100644 --- a/Documentation/iio/ad7380.rst +++ b/Documentation/iio/ad7380.rst @@ -178,6 +178,24 @@ Unimplemented features - Power down mode - CRC indication +SPI offload support +=================== + +To be able to achieve the maximum sample rate, the driver can be used with the +`AXI SPI Engine`_ to provide SPI offload support. + +.. _AXI SPI Engine: http://analogdevicesinc.github.io/hdl/projects/pulsar_adc/index.html + +When SPI offload is being used, some attributes will be different. + +* ``trigger`` directory is removed. +* ``in_voltage0_sampling_frequency`` attribute is added for setting the sample + rate. +* ``in_voltage0_sampling_frequency_available`` attribute is added for querying + the max sample rate. +* ``timestamp`` channel is removed. +* Buffer data format may be different compared to when offload is not used, + e.g. the ``in_voltage0_type`` attribute. Device buffers ==============