linux-kernel - Re: [PATCH linux-next v4 2/4] spi: imx: add selection for iMX53 and iMX6 controller

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Date:   Mon, 12 Jun 2017 10:53:45 -0500
From:   Rob Herring <robh@...nel.org>
To:     Jiada Wang <jiada_wang@...tor.com>
Cc:     broonie@...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 linux-next v4 2/4] spi: imx: add selection for iMX53 and
 iMX6 controller

On Thu, Jun 08, 2017 at 02:16:01PM +0900, Jiada Wang wrote:
> 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                              | 26 ++++++++++++++++++++--
>  2 files changed, 25 insertions(+), 2 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/spi/fsl-imx-cspi.txt b/Documentation/devicetree/bindings/spi/fsl-imx-cspi.txt
> index 31b5b21..5bf1396 100644
> --- a/Documentation/devicetree/bindings/spi/fsl-imx-cspi.txt
> +++ b/Documentation/devicetree/bindings/spi/fsl-imx-cspi.txt
> @@ -9,6 +9,7 @@ Required properties:
>    - "fsl,imx31-cspi" for SPI compatible with the one integrated on i.MX31
>    - "fsl,imx35-cspi" for SPI compatible with the one integrated on i.MX35
>    - "fsl,imx51-ecspi" for SPI compatible with the one integrated on i.MX51
> +  - "fsl,imx53-ecspi" for SPI compatible with the one integrated on i.MX53 and later Soc
>  - reg : Offset and length of the register set for the device
>  - interrupts : Should contain CSPI/eCSPI interrupt
>  - cs-gpios : Specifies the gpio pins to be used for chipselects.
> diff --git a/drivers/spi/spi-imx.c b/drivers/spi/spi-imx.c
> index 4469121..8e6f339 100644
> --- a/drivers/spi/spi-imx.c
> +++ b/drivers/spi/spi-imx.c
> @@ -63,7 +63,8 @@ enum spi_imx_devtype {
>  	IMX27_CSPI,
>  	IMX31_CSPI,
>  	IMX35_CSPI,	/* CSPI on all i.mx except above */
> -	IMX51_ECSPI,	/* ECSPI on i.mx51 and later */
> +	IMX51_ECSPI,	/* ECSPI on i.mx51 */
> +	IMX53_ECSPI,	/* ECSPI on i.mx53 and later */

Looks like i.MX51 and i.MX53 are the same. While the DT should have 
different compatibles (with fallbacks), the driver should map them to 
the same type until there's some difference found.

Rob