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Date:   Sat, 2 Feb 2019 08:13:38 +0100
From:   Boris Brezillon <bbrezillon@kernel.org>
To:     <Tudor.Ambarus@microchip.com>
Cc:     <broonie@kernel.org>, <robh+dt@kernel.org>, <mark.rutland@arm.com>,
        <Nicolas.Ferre@microchip.com>, <alexandre.belloni@bootlin.com>,
        <Ludovic.Desroches@microchip.com>, <Cyrille.Pitchen@microchip.com>,
        <bugalski.piotr@gmail.com>, <linux-spi@vger.kernel.org>,
        <devicetree@vger.kernel.org>,
        <linux-arm-kernel@lists.infradead.org>,
        <linux-kernel@vger.kernel.org>, <linux-mtd@lists.infradead.org>
Subject: Re: [PATCH v3 08/13] spi: atmel-quadspi: drop unused and NOP
 transfer macros
Message-ID: <20190202081338.01056dce@bbrezillon>
In-Reply-To: <20190202040653.1217-9-tudor.ambarus@microchip.com>
References: <20190202040653.1217-1-tudor.ambarus@microchip.com>
        <20190202040653.1217-9-tudor.ambarus@microchip.com>
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On Sat, 2 Feb 2019 04:07:33 +0000
<Tudor.Ambarus@microchip.com> wrote:

> From: Tudor Ambarus <tudor.ambarus@microchip.com>
> 
> Remove NOP when setting read transfer type. Remove useless
> setting of write transfer type when
> op->data.dir == SPI_MEM_DATA_IN && !op->data.nbytes.
> 
> QSPI_IFR_TFRTYP_TRSFR_WRITE is specific just to sama5d2 qspi,
> rename it to QSPI_IFR_SAMA5D2_WRITE_TRSFR.
> 
> Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
> ---
> v3: new patch
> 
>  drivers/spi/atmel-quadspi.c | 12 +++---------
>  1 file changed, 3 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/spi/atmel-quadspi.c b/drivers/spi/atmel-quadspi.c
> index d26d4cd0e36b..bfa5f5e92d96 100644
> --- a/drivers/spi/atmel-quadspi.c
> +++ b/drivers/spi/atmel-quadspi.c
> @@ -113,11 +113,7 @@
>  #define QSPI_IFR_OPTL_4BIT              (2 << 8)
>  #define QSPI_IFR_OPTL_8BIT              (3 << 8)
>  #define QSPI_IFR_ADDRL                  BIT(10)
> -#define QSPI_IFR_TFRTYP_MASK            GENMASK(13, 12)
> -#define QSPI_IFR_TFRTYP_TRSFR_READ      (0 << 12)
> -#define QSPI_IFR_TFRTYP_TRSFR_READ_MEM  (1 << 12)
> -#define QSPI_IFR_TFRTYP_TRSFR_WRITE     (2 << 12)
> -#define QSPI_IFR_TFRTYP_TRSFR_WRITE_MEM (3 << 13)
> +#define QSPI_IFR_SAMA5D2_WRITE_TRSFR	BIT(13)

Can you define QSPI_IFR_TFRTYP_MEM (bit 12) even if it's not used yet?

>  #define QSPI_IFR_CRM                    BIT(14)
>  #define QSPI_IFR_NBDUM_MASK             GENMASK(20, 16)
>  #define QSPI_IFR_NBDUM(n)               (((n) << 16) & QSPI_IFR_NBDUM_MASK)
> @@ -273,10 +269,8 @@ static int atmel_qspi_exec_op(struct spi_mem *mem, const struct spi_mem_op *op)
>  	if (op->data.nbytes)
>  		ifr |= QSPI_IFR_DATAEN;
>  
> -	if (op->data.dir == SPI_MEM_DATA_IN && op->data.nbytes)
> -		ifr |= QSPI_IFR_TFRTYP_TRSFR_READ;
> -	else
> -		ifr |= QSPI_IFR_TFRTYP_TRSFR_WRITE;
> +	if (op->data.dir == SPI_MEM_DATA_OUT)
> +		ifr |= QSPI_IFR_SAMA5D2_WRITE_TRSFR;
>  
>  	/* Clear pending interrupts */
>  	(void)readl_relaxed(base + QSPI_SR);