linux-kernel - Re: [PATCH 0/2] TCB: Add DMA support to read the capture register AB

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Message-ID: <b9b9aea9-e02d-4d5f-9f07-ef1c54e46b89@baylibre.com>
Date: Thu, 29 May 2025 10:26:44 -0500
From: David Lechner <dlechner@...libre.com>
To: Dharma Balasubiramani <dharma.b@...rochip.com>,
 Kamel Bouhara <kamel.bouhara@...tlin.com>,
 William Breathitt Gray <wbg@...nel.org>,
 Nicolas Ferre <nicolas.ferre@...rochip.com>,
 Alexandre Belloni <alexandre.belloni@...tlin.com>,
 Claudiu Beznea <claudiu.beznea@...on.dev>
Cc: linux-arm-kernel@...ts.infradead.org, linux-iio@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/2] TCB: Add DMA support to read the capture register AB

Please include the counter: prefix in the subject of the cover letter
as well. It makes it easier to see at a glance what this series might
be about.

On 5/28/25 1:13 AM, Dharma Balasubiramani wrote:
> This patch series adds support to enable the DMA support for TCB.
> 
> When DMA is used, the Register AB (TC_RAB) address must be configured as
> source address of the transfer. TC_RAB provides the next unread value from
> TC_RA and TC_RB. It may be read by the DMA after a request has been
> triggered upon loading TC_RA or TC_RB.

Can you please explain what problem this series is solving and why we
need this change?