Re: [PATCH v6 3/9] spi: Add a driver for the Freescale/NXP QuadSPI controller

[Schrempf Frieder]

Hi Yogesh,

On 29.11.18 12:38, Yogesh Narayan Gaur wrote:
> Hi Frieder,
> 
>> -----Original Message-----
>> From: Schrempf Frieder [mailto:frieder.schrempf@xxxxxxxxxx]
>> Sent: Wednesday, November 28, 2018 1:58 PM
>> To: linux-mtd@xxxxxxxxxxxxxxxxxxx; boris.brezillon@xxxxxxxxxxx; linux-
>> spi@xxxxxxxxxxxxxxx; Marek Vasut <marek.vasut@xxxxxxxxx>; Mark Brown
>> <broonie@xxxxxxxxxx>; Han Xu <han.xu@xxxxxxx>
>> Cc: dwmw2@xxxxxxxxxxxxx; computersforpeace@xxxxxxxxx; richard@xxxxxx;
>> miquel.raynal@xxxxxxxxxxx; David Wolfe <david.wolfe@xxxxxxx>; Fabio
>> Estevam <fabio.estevam@xxxxxxx>; Prabhakar Kushwaha
>> <prabhakar.kushwaha@xxxxxxx>; Yogesh Narayan Gaur
>> <yogeshnarayan.gaur@xxxxxxx>; shawnguo@xxxxxxxxxx; linux-
>> kernel@xxxxxxxxxxxxxxx
>> Subject: Re: [PATCH v6 3/9] spi: Add a driver for the Freescale/NXP QuadSPI
>> controller
>>
>> On 27.11.18 11:24, Schrempf Frieder wrote:
>>> This driver is derived from the SPI NOR driver at
>>> mtd/spi-nor/fsl-quadspi.c. It uses the new SPI memory interface of the
>>> SPI framework to issue flash memory operations to up to four connected
>>> flash chips (2 buses with 2 CS each).
>>>
>>> The controller does not support generic SPI messages.
>>>
>>> This patch also disables the build of the "old" driver and reuses its
>>> Kconfig option CONFIG_SPI_FSL_QUADSPI to replace it.
>>>
>>> Signed-off-by: Frieder Schrempf <frieder.schrempf@xxxxxxxxxx>
>>> ---
>>>    drivers/mtd/spi-nor/Kconfig  |   9 -
>>>    drivers/mtd/spi-nor/Makefile |   1 -
>>>    drivers/spi/Kconfig          |  11 +
>>>    drivers/spi/Makefile         |   1 +
>>>    drivers/spi/spi-fsl-qspi.c   | 967
>> ++++++++++++++++++++++++++++++++++++++
>>>    5 files changed, 979 insertions(+), 10 deletions(-)
>>>
>>> diff --git a/drivers/mtd/spi-nor/Kconfig b/drivers/mtd/spi-nor/Kconfig
>>> index 6cc9c92..d1ca307 100644
>>> --- a/drivers/mtd/spi-nor/Kconfig
>>> +++ b/drivers/mtd/spi-nor/Kconfig
>>> @@ -59,15 +59,6 @@ config SPI_CADENCE_QUADSPI
>>>    	  device with a Cadence QSPI controller and want to access the
>>>    	  Flash as an MTD device.
>>>
>>> -config SPI_FSL_QUADSPI
>>> -	tristate "Freescale Quad SPI controller"
>>> -	depends on ARCH_MXC || SOC_LS1021A || ARCH_LAYERSCAPE ||
>> COMPILE_TEST
>>> -	depends on HAS_IOMEM
>>> -	help
>>> -	  This enables support for the Quad SPI controller in master mode.
>>> -	  This controller does not support generic SPI. It only supports
>>> -	  SPI NOR.
>>> -
>>>    config SPI_HISI_SFC
>>>    	tristate "Hisilicon SPI-NOR Flash Controller(SFC)"
>>>    	depends on ARCH_HISI || COMPILE_TEST diff --git
>>> a/drivers/mtd/spi-nor/Makefile b/drivers/mtd/spi-nor/Makefile index
>>> f4c61d2..3f160c2e3 100644
>>> --- a/drivers/mtd/spi-nor/Makefile
>>> +++ b/drivers/mtd/spi-nor/Makefile
>>> @@ -3,7 +3,6 @@ obj-$(CONFIG_MTD_SPI_NOR)	+= spi-nor.o
>>>    obj-$(CONFIG_SPI_ASPEED_SMC)	+= aspeed-smc.o
>>>    obj-$(CONFIG_SPI_ATMEL_QUADSPI)	+= atmel-quadspi.o
>>>    obj-$(CONFIG_SPI_CADENCE_QUADSPI)	+= cadence-quadspi.o
>>> -obj-$(CONFIG_SPI_FSL_QUADSPI)	+= fsl-quadspi.o
>>>    obj-$(CONFIG_SPI_HISI_SFC)	+= hisi-sfc.o
>>>    obj-$(CONFIG_MTD_MT81xx_NOR)    += mtk-quadspi.o
>>>    obj-$(CONFIG_SPI_NXP_SPIFI)	+= nxp-spifi.o
>>> diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig index
>>> 7d3a5c9..8c84186 100644
>>> --- a/drivers/spi/Kconfig
>>> +++ b/drivers/spi/Kconfig
>>> @@ -259,6 +259,17 @@ config SPI_FSL_LPSPI
>>>    	help
>>>    	  This enables Freescale i.MX LPSPI controllers in master mode.
>>>
>>> +config SPI_FSL_QUADSPI
>>> +	tristate "Freescale QSPI controller"
>>> +	depends on ARCH_MXC || SOC_LS1021A || ARCH_LAYERSCAPE ||
>> COMPILE_TEST
>>> +	depends on HAS_IOMEM
>>> +	help
>>> +	  This enables support for the Quad SPI controller in master mode.
>>> +	  Up to four flash chips can be connected on two buses with two
>>> +	  chipselects each.
>>> +	  This controller does not support generic SPI messages. It only
>>> +	  supports the high-level SPI memory interface.
>>> +
> [...]
>>> +static void fsl_qspi_select_mem(struct fsl_qspi *q, struct spi_device *spi)
>>> +{
>>> +	unsigned long rate = spi->max_speed_hz;
>>> +	int ret, i;
>>> +	u32 map_addr;
>>
>> Forgot to drop some unused vars here. I will remove them in the next
>> version.
>>
> 
> Yes, below are the build warnings messages coming for this version of the patch.
> 
> 	drivers/spi/spi-fsl-qspi.c: In function âfsl_qspi_select_memâ:
> 	drivers/spi/spi-fsl-qspi.c:500:6: warning: unused variable âmap_addrâ [-Wunused-variable]
> 	  u32 map_addr;
> 	      ^
> 	drivers/spi/spi-fsl-qspi.c:499:11: warning: unused variable âiâ [-Wunused-variable]
> 	  int ret, i;
> 
>>> +
>>> +	if (q->selected == spi->chip_select)
> [...]
> 
> Verified this patch series on LayerScape-2.x architecture boards.
> LS1088ardb, is having two connected flash slave devices on CS0 and CS1.
> 
> Verified with simple Read/Write/Erase operations along with JFFS2 mounting and booting from flash MTD partition for both slave devices.

Thank you for testing! Does this mean I can add your Tested-by tag?
If you have done a review of any of the patches in this set, please also 
add a Reviewed-by tag.

Thanks,
Frieder