linux-kernel - Re: [PATCH 1/1] spi: imx: support to set watermark level via DTS

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Date:   Thu, 5 Jan 2017 17:58:54 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Jiada Wang <jiada_wang@...tor.com>
Cc:     robh+dt@...nel.org, mark.rutland@....com,
        linux-spi@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] spi: imx: support to set watermark level via DTS

On Thu, Jan 05, 2017 at 03:10:15PM +0900, Jiada Wang wrote:

> Previously watermark level is configured to fifosize/2,
> DMA mode can be used only when transfer length can be divided
> by 'watermark level * bpw', which makes DMA mode not practical.

> This patch adds new DTS property 'dma-wml', user can configure
> DMA watermark level, by specify 'dma-wml' in corresponding ecspi
> node.

Doesn't this just move the problem around a bit - can we not have the
driver figure out a more sensible watermark for each transfer rather
than fixing one in the DT?

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