linux-kernel - Re: [PATCH v8 08/11] iio: adc: ad7768-1: add support for Synchronization over SPI

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Message-ID: <4d3b02c6-0cca-45c8-827d-3ab1dac401af@baylibre.com>
Date: Thu, 15 May 2025 17:46:17 -0500
From: David Lechner <dlechner@...libre.com>
To: Jonathan Santos <Jonathan.Santos@...log.com>, linux-iio@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-gpio@...r.kernel.org
Cc: andy@...nel.org, nuno.sa@...log.com, Michael.Hennerich@...log.com,
 marcelo.schmitt@...log.com, jic23@...nel.org, robh@...nel.org,
 krzk+dt@...nel.org, conor+dt@...nel.org, marcelo.schmitt1@...il.com,
 linus.walleij@...aro.org, brgl@...ev.pl, lgirdwood@...il.com,
 broonie@...nel.org, jonath4nns@...il.com
Subject: Re: [PATCH v8 08/11] iio: adc: ad7768-1: add support for
 Synchronization over SPI

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 <Jonathan.Santos@...log.com>
> ---
Reviewed-by: David Lechner <dlechner@...libre.com>