linux-kernel - Re: [PATCH v2] spi: dw: support 4-16 bits per word

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Date:   Fri, 17 Aug 2018 16:32:31 +0000
From:   Trent Piepho <tpiepho@...inj.com>
To:     "linux-spi@...r.kernel.org" <linux-spi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "simon.k.r.goldschmidt@...il.com" <simon.k.r.goldschmidt@...il.com>,
        "andy.shevchenko@...il.com" <andy.shevchenko@...il.com>,
        "broonie@...nel.org" <broonie@...nel.org>
Subject: Re: [PATCH v2] spi: dw: support 4-16 bits per word

On Fri, 2018-08-17 at 09:01 +0200, Simon Goldschmidt wrote:
> The spi-dw driver currently only supports 8 or 16 bits per word.
> 
> Since the hardware supports 4-16 bits per word, adapt the driver
> to also support this.
> 
> 

> @@ -307,15 +307,13 @@ static int dw_spi_transfer_one(struct spi_controller *master,
> +
> +	if ((transfer->bits_per_word < 4) || (transfer->bits_per_word > 16))
>  		return -EINVAL;
> -	}

You don't need this check as the spi core validates the transfer
against master->bits_per_word_mask.

>  	master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_LOOP;
> -	master->bits_per_word_mask = SPI_BPW_MASK(8) | SPI_BPW_MASK(16);
> +	master->bits_per_word_mask =  SPI_BPW_RANGE_MASK(4, 16);
>  	master->bus_num = dws->bus_num;
>