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([2600:8803:e7e4:1d00:d2f:9b08:7c22:3090]) by smtp.gmail.com with ESMTPSA id 46e09a7af769-734f6b3ab44sm133562a34.43.2025.05.15.15.46.17 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 15 May 2025 15:46:18 -0700 (PDT) Message-ID: <4d3b02c6-0cca-45c8-827d-3ab1dac401af@baylibre.com> Date: Thu, 15 May 2025 17:46:17 -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 v8 08/11] iio: adc: ad7768-1: add support for Synchronization over SPI To: Jonathan Santos , linux-iio@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-gpio@vger.kernel.org Cc: andy@kernel.org, nuno.sa@analog.com, Michael.Hennerich@analog.com, marcelo.schmitt@analog.com, jic23@kernel.org, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, marcelo.schmitt1@gmail.com, linus.walleij@linaro.org, brgl@bgdev.pl, lgirdwood@gmail.com, broonie@kernel.org, jonath4nns@gmail.com References: <59f45c9af16fa68f2a479f824129f5a9f2cd0997.1747175187.git.Jonathan.Santos@analog.com> Content-Language: en-US From: David Lechner In-Reply-To: <59f45c9af16fa68f2a479f824129f5a9f2cd0997.1747175187.git.Jonathan.Santos@analog.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 5/15/25 4:13 PM, Jonathan Santos wrote: > The synchronization method using GPIO requires the generated pulse to be > truly synchronous with the base MCLK signal. When it is not possible to > do that in hardware, the datasheet recommends using synchronization over > SPI, where the generated pulse is already synchronous with MCLK. This > requires the SYNC_OUT pin to be connected to the SYNC_IN pin. > > Use trigger-sources property to enable device synchronization over SPI > and multi-device synchronization while replacing sync-in-gpios property. > > Signed-off-by: Jonathan Santos > --- Reviewed-by: David Lechner