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

[Yogesh Narayan Gaur]

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.

Thanks.

--
Regards
Yogesh Gaur