linux-kernel - Re: [PATCH v6 4/5] spi: dw: Add DMA address widths capability check

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Message-ID: <ZD5IVvoMO/an5h0A@smile.fi.intel.com>
Date:   Tue, 18 Apr 2023 10:35:50 +0300
From:   Andy Shevchenko <andriy.shevchenko@...el.com>
To:     Joy Chakraborty <joychakr@...gle.com>
Cc:     Serge Semin <fancer.lancer@...il.com>,
        Mark Brown <broonie@...nel.org>, linux-spi@...r.kernel.org,
        linux-kernel@...r.kernel.org, manugautam@...gle.com,
        rohitner@...gle.com
Subject: Re: [PATCH v6 4/5] spi: dw: Add DMA address widths capability check

On Fri, Apr 14, 2023 at 12:05:19PM +0000, Joy Chakraborty wrote:
> Store address width capabilities of DMA controller during init and check
> the same per transfer to make sure the bits/word requirement can be met.
> 
> Current DW DMA driver requires both tx and rx channel to be configured
> and functional hence a subset of both tx and rx channel address width
> capability is checked with the width requirement(n_bytes) for a
> transfer.

...

> +	/*
> +	 * Assuming both channels belong to the same DMA controller hence the
> +	 * address width capabilities most likely would be the same.

I would add something to explain the side of these address width, like

	 * Assuming both channels belong to the same DMA controller hence
	 * the peripheral side address width capabilities most likely would
	 * be the same.

> +	 */

-- 
With Best Regards,
Andy Shevchenko