Linux-SPI Archive on lore.kernel.org
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From: Tomas Melin <tomas.melin@vaisala.com>
To: Clark Wang <xiaoning.wang@nxp.com>,
	broonie@kernel.org, shawnguo@kernel.org, s.hauer@pengutronix.de,
	festevam@gmail.com
Cc: kernel@pengutronix.de, linux-imx@nxp.com,
	linux-spi@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH] spi: imx: add 16/32 bits per word support for slave mode
Date: Mon, 24 May 2021 11:25:28 +0300
Message-ID: <961ec8d9-d96e-2dce-f2d0-b10299e10afb@vaisala.com> (raw)
In-Reply-To: <20210408103347.244313-1-xiaoning.wang@nxp.com>

Hi,

On 4/8/21 1:33 PM, Clark Wang wrote:
> Enable 16/32 bits per word support for spi-imx slave mode.
> It only support 8 bits per word in slave mode before.
>
> Signed-off-by: Clark Wang <xiaoning.wang@nxp.com>
> Reviewed-by: Haibo Chen <haibo.chen@nxp.com>
> ---
>   drivers/spi/spi-imx.c | 13 +++++++++++--
>   1 file changed, 11 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/spi/spi-imx.c b/drivers/spi/spi-imx.c
> index 4fe767acaca7..24ba7ab1b05d 100644
> --- a/drivers/spi/spi-imx.c
> +++ b/drivers/spi/spi-imx.c
> @@ -386,7 +386,12 @@ static void spi_imx_buf_tx_swap(struct spi_imx_data *spi_imx)
>   
>   static void mx53_ecspi_rx_slave(struct spi_imx_data *spi_imx)
>   {
> -	u32 val = be32_to_cpu(readl(spi_imx->base + MXC_CSPIRXDATA));
> +	u32 val = readl(spi_imx->base + MXC_CSPIRXDATA);
> +
> +	if (spi_imx->bits_per_word <= 8)
> +		val = be32_to_cpu(val);
> +	else if (spi_imx->bits_per_word <= 16)
> +		val = (val << 16) | (val >> 16);

Would it be good to use available

     spi_imx_buf_rx_u32

     spi_imx_buf_rx_u16

     spi_imx_buf_rx_u8

helpers here?

thanks,

Tomas


>   
>   	if (spi_imx->rx_buf) {
>   		int n_bytes = spi_imx->slave_burst % sizeof(val);
> @@ -415,7 +420,11 @@ static void mx53_ecspi_tx_slave(struct spi_imx_data *spi_imx)
>   	if (spi_imx->tx_buf) {
>   		memcpy(((u8 *)&val) + sizeof(val) - n_bytes,
>   		       spi_imx->tx_buf, n_bytes);
> -		val = cpu_to_be32(val);
> +		if (spi_imx->bits_per_word <= 8)
> +			val = cpu_to_be32(val);
> +		else if (spi_imx->bits_per_word <= 16)
> +			val = (val << 16) | (val >> 16);
> +
>   		spi_imx->tx_buf += n_bytes;
>   	}
>   

      parent reply index

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-08 10:33 Clark Wang
2021-04-08 10:33 ` [PATCH] spi: imx: add a check for speed_hz before calculating the clock Clark Wang
2021-04-08 13:43   ` Mark Brown
2021-04-08 14:05   ` Mark Brown
2021-04-09 16:22   ` Mark Brown
2021-05-24  8:25 ` Tomas Melin [this message]

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