linux-kernel - Re: [PATCH v2 0/4] spi: dw: Auto-detect number of native CS

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Date: Thu, 22 Feb 2024 19:52:30 +0200
From: Andy Shevchenko <andy.shevchenko@...il.com>
To: Serge Semin <fancer.lancer@...il.com>
Cc: Mark Brown <broonie@...nel.org>, 
	Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>, 
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>, Andy Shevchenko <andy@...nel.org>, 
	linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 0/4] spi: dw: Auto-detect number of native CS

On Thu, Feb 22, 2024 at 7:28 PM Serge Semin <fancer.lancer@...il.com> wrote:
>
> The main goal of the short series is to provide a procedure implementing
> the auto-detection of the number of native Chip-Select signals supported
> by the controller. The suggested algorithm is straightforward. It relies
> on the fact that the SER register writable flags reflects the actual
> number of available native chip-select signals. So the DW APB/AHB SSI
> driver now tests the SER register for having the writable bits,
> calculates the number of CS signals based on the number of set flags and
> then initializes the num_cs private data field based on that, which then
> will be passed to the SPI-core subsystem indicating the number of
> supported hardware chip-selects. The implemented procedure will be useful
> for the DW SSI device nodes not having the explicitly set "num-cs"
> property. In case if the property is specified it will be utilized instead
> of the auto-detection procedure.
>
> Besides of that a small cleanup patch is introduced in the head of the
> series. It converts the driver to using the BITS_TO_BYTES() macro instead
> of the hard-coded DIV_ROUND_UP()-based calculation of the number of
> bytes-per-transfer-word.
>
> Link: https://lore.kernel.org/linux-spi/20240215180102.13887-1-fancer.lancer@gmail.com
> Changelog v2:
> - Add a new patch:
>   [PATCH v2 3/4] spi: dw: Convert dw_spi::num_cs to u32
> - Fix some spelling notes (@Andy).

For all untagged,
Reviewed-by: Andy Shevchenko <andy@...nel.org>
Thank you!

-- 
With Best Regards,
Andy Shevchenko