linux-kernel - Re: [PATCH v1 2/2] spi: stm32-qspi: Refactor dual flash mode enable check in ->setup()

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Date:   Wed, 31 Aug 2022 10:03:48 +0200
From:   Patrice CHOTARD <patrice.chotard@...s.st.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Mark Brown <broonie@...nel.org>, <linux-spi@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
CC:     Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>
Subject: Re: [PATCH v1 2/2] spi: stm32-qspi: Refactor dual flash mode enable
 check in ->setup()

HI Andy

On 8/30/22 20:28, Andy Shevchenko wrote:
> gpiod_count() either returns positive number of the CS or negative
> error code. In the stm32_qspi_setup() we check that configuration
> has enough CS for the dual flash mode and SPI mode is not changing
> over the lines of the code. Taking all above into considertion,
> refactor dual flash mode enable check by dropping unneeded CS check
> and reusing local mode variable.
> 
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> ---
>  drivers/spi/spi-stm32-qspi.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/spi/spi-stm32-qspi.c b/drivers/spi/spi-stm32-qspi.c
> index 5858f5f9c758..9131660c1afb 100644
> --- a/drivers/spi/spi-stm32-qspi.c
> +++ b/drivers/spi/spi-stm32-qspi.c
> @@ -680,8 +680,7 @@ static int stm32_qspi_setup(struct spi_device *spi)
>  	 * Dual flash mode is only enable in case SPI_TX_OCTAL and SPI_TX_OCTAL
>  	 * are both set in spi->mode and "cs-gpios" properties is found in DT
>  	 */
> -	if (((spi->mode & (SPI_TX_OCTAL | SPI_RX_OCTAL)) == (SPI_TX_OCTAL | SPI_RX_OCTAL)) &&
> -	    gpiod_count(qspi->dev, "cs")) {
> +	if (mode == (SPI_TX_OCTAL | SPI_RX_OCTAL)) {
>  		qspi->cr_reg |= CR_DFM;
>  		dev_dbg(qspi->dev, "Dual flash mode enable");
>  	}

Reviewed-by: Patrice Chotard <patrice.chotard@...s.st.com>

Thanks
Patrice