linux-kernel - Re: [PATCH v13 1/6] i2c: tegra: Do not configure DMA if not supported

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Message-ID: <tyhys3dozh4ij6gznrfr4b3qfpd3urtwdugz2ojsmshbrlhtqv@zzxyxkk4ce7v>
Date: Thu, 27 Nov 2025 10:29:45 +0100
From: Thierry Reding <thierry.reding@...il.com>
To: Akhil R <akhilrajeev@...dia.com>
Cc: andi.shyti@...nel.org, digetx@...il.com, jonathanh@...dia.com, 
	linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org, linux-tegra@...r.kernel.org, 
	wsa+renesas@...g-engineering.com, wsa@...nel.org, kkartik@...dia.com, ldewangan@...dia.com, 
	smangipudi@...dia.com
Subject: Re: [PATCH v13 1/6] i2c: tegra: Do not configure DMA if not supported

On Tue, Nov 18, 2025 at 07:36:15PM +0530, Akhil R wrote:
> From: Kartik Rajput <kkartik@...dia.com>
> 
> On Tegra264, not all I2C controllers have the necessary interface to
> GPC DMA, this causes failures when function tegra_i2c_init_dma()
> is called.
> 
> Ensure that "dmas" device-tree property is present before initializing
> DMA in function tegra_i2c_init_dma().
> 
> Signed-off-by: Kartik Rajput <kkartik@...dia.com>
> Reviewed-by: Jon Hunter <jonathanh@...dia.com>
> ---
> v4 -> v9:
>         * Moved the condition down to have all dma checks together.
> v2 -> v4:
>         * Add debug print if DMA is not supported by the I2C controller.
> v1 -> v2:
>         * Update commit message to clarify that some I2C controllers may
>           not have the necessary interface to GPC DMA.
> ---
>  drivers/i2c/busses/i2c-tegra.c | 5 +++++
>  1 file changed, 5 insertions(+)

Acked-by: Thierry Reding <treding@...dia.com>

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