linux-kernel - Re: [PATCH v2 linux-next 1/3] spi: imx: add selection for iMX53 and iMX6 controller

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Message-ID: <20170531100614.nl7mjtjamtpo7ltp@pengutronix.de>
Date:   Wed, 31 May 2017 12:06:14 +0200
From:   Sascha Hauer <s.hauer@...gutronix.de>
To:     jiada_wang@...tor.com
Cc:     broonie@...nel.org, robh+dt@...nel.org, mark.rutland@....com,
        shawnguo@...nel.org, kernel@...gutronix.de, fabio.estevam@....com,
        linux-spi@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 linux-next 1/3] spi: imx: add selection for iMX53 and
 iMX6 controller

On Wed, May 31, 2017 at 02:19:56AM -0700, jiada_wang@...tor.com wrote:
> From: Jiada Wang <jiada_wang@...tor.com>
> 
> ECSPI contorller for iMX53 and iMX6 has few hardware issues
> comparing to iMX51.
> The change add possibility to detect which controller is used
> to apply possible workaround and limitations.
> 
> Signed-off-by: Jiada Wang <jiada_wang@...tor.com>
> ---
>  .../devicetree/bindings/spi/fsl-imx-cspi.txt       |  1 +
>  drivers/spi/spi-imx.c                              | 46 ++++++++++++++++++++--

[...]

> +
>  static inline unsigned spi_imx_get_fifosize(struct spi_imx_data *d)
>  {
> -	return is_imx51_ecspi(d) ? 64 : 8;
> +	switch (d->devtype_data->devtype) {
> +	case IMX51_ECSPI:
> +	case IMX53_ECSPI:
> +		return 64;
> +	default:
> +		return 8;
> +	}
> +}
> +
> +static inline bool spi_imx_has_dmamode(struct spi_imx_data *d)
> +{
> +	switch (d->devtype_data->devtype) {
> +	case IMX35_CSPI:
> +	case IMX51_ECSPI:
> +	case IMX53_ECSPI:
> +		return true;
> +	default:
> +		return false;
> +	}
>  }

Please add the fifosize and DMA capability to struct spi_imx_devtype_data, this
struct was introduced to hold SoC specific informations.

Sascha

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