linux-kernel - Re: [PATCH v1 2/2] spi: pxa2xx: Make num_chipselect 8-bit in the struct pxa2xx_spi

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Message-Id: <64cde1d1-1d4f-484a-940f-536c1279287e@app.fastmail.com>
Date: Thu, 07 Mar 2024 17:37:17 +0100
From: "Arnd Bergmann" <arnd@...db.de>
To: "Andy Shevchenko" <andriy.shevchenko@...ux.intel.com>,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
 linux-spi@...r.kernel.org
Cc: "Daniel Mack" <daniel@...que.org>,
 "Haojian Zhuang" <haojian.zhuang@...il.com>,
 "Robert Jarzmik" <robert.jarzmik@...e.fr>,
 "Russell King" <linux@...linux.org.uk>, "Mark Brown" <broonie@...nel.org>
Subject: Re: [PATCH v1 2/2] spi: pxa2xx: Make num_chipselect 8-bit in the struct
 pxa2xx_spi_controller

On Thu, Mar 7, 2024, at 17:07, Andy Shevchenko wrote:
> There is no use for whole 16-bit for the number of chip select pins.
> Drop it to 8 bits.
>
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

Acked-by: Arnd Bergmann <arnd@...db.de>

> ---
>  include/linux/spi/pxa2xx_spi.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/include/linux/spi/pxa2xx_spi.h b/include/linux/spi/pxa2xx_spi.h
> index 56aba2f737b1..e5a4a045fb67 100644
> --- a/include/linux/spi/pxa2xx_spi.h
> +++ b/include/linux/spi/pxa2xx_spi.h
> @@ -17,7 +17,7 @@ struct dma_chan;
>   * (resides in device.platform_data).
>   */
>  struct pxa2xx_spi_controller {
> -	u16 num_chipselect;
> +	u8 num_chipselect;
>  	u8 enable_dma;
>  	u8 dma_burst_size;
>  	bool is_target;

I wonder if we could just move the entire header to drivers/spi/.
The spitz board only fills the num_chipselect field anyway,
and that could be derived from the GPIO lookups instead.

      Arnd