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

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Date:   Tue, 13 Jun 2017 09:29:58 -0500
From:   Rob Herring <robh@...nel.org>
To:     Jiada Wang <jiada_wang@...tor.com>
Cc:     Mark Brown <broonie@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Shawn Guo <shawnguo@...nel.org>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        Fabio Estevam <fabio.estevam@....com>,
        "linux-spi@...r.kernel.org" <linux-spi@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.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 Tue, Jun 13, 2017 at 12:28 AM, Jiada Wang <jiada_wang@...tor.com> wrote:
> Hello Rob
>
>
> On 06/13/2017 12:53 AM, Rob Herring wrote:
>>
>> 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.
>>
> the difference between i.MX51 and i.MX53 is introduced in the
> 4th patch "spi: imx: Add support for SPI Slave mode" in this patch set

Okay, I missed that.

> do you think, I need to merge the two patches into one?

No, not necessary.

Acked-by: Rob Herring <robh@...nel.org>

Rob