linux-kernel - Re: [PATCH 5/5] i2c: tegra: Do not configure DMA if not supported

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Message-ID: <ty3ctkatywnq6ukrcgkqrzstch2k5qymjfgntnyi23riapytkg@7vzjyszmq3ml>
Date: Thu, 9 Jan 2025 11:33:06 +0100
From: Thierry Reding <thierry.reding@...il.com>
To: Kartik Rajput <kkartik@...dia.com>
Cc: akhilrajeev@...dia.com, andi.shyti@...nel.org, robh@...nel.org, 
	krzk+dt@...nel.org, conor+dt@...nel.org, jonathanh@...dia.com, ldewangan@...dia.com, 
	digetx@...il.com, linux-i2c@...r.kernel.org, devicetree@...r.kernel.org, 
	linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/5] i2c: tegra: Do not configure DMA if not supported

On Wed, Jan 08, 2025 at 04:36:20PM +0530, Kartik Rajput wrote:
> On Tegra264, not all I2C controllers support DMA, this causes failures
> when function tegra_i2c_init_dma() is called.

What exactly does it mean when you say "not all I2C controllers support
DMA"? Do they not have the necessary interface to the GPC DMA or are
there not sufficient DMA channels to support all I2C controllers?

Thierry

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