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SubjectRE: [PATCH v6 3/9] spi: Add a driver for the Freescale/NXP QuadSPI controller
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> -----Original Message-----
> From: Schrempf Frieder <frieder.schrempf@kontron.de>
> Sent: Thursday, November 29, 2018 5:54 AM
> To: Yogesh Narayan Gaur <yogeshnarayan.gaur@nxp.com>; linux-
> mtd@lists.infradead.org; boris.brezillon@bootlin.com; linux-
> spi@vger.kernel.org; Marek Vasut <marek.vasut@gmail.com>; Mark Brown
> <broonie@kernel.org>; Han Xu <han.xu@nxp.com>
> Cc: dwmw2@infradead.org; computersforpeace@gmail.com;
> richard@nod.at; miquel.raynal@bootlin.com; David Wolfe
> <david.wolfe@nxp.com>; Fabio Estevam <fabio.estevam@nxp.com>;
> Prabhakar Kushwaha <prabhakar.kushwaha@nxp.com>;
> shawnguo@kernel.org; linux-kernel@vger.kernel.org
> Subject: Re: [PATCH v6 3/9] spi: Add a driver for the Freescale/NXP QuadSPI
> controller
>
> Hi Yogesh,
>
> On 29.11.18 12:38, Yogesh Narayan Gaur wrote:
> > Hi Frieder,
> >
> >> -----Original Message-----
> >> From: Schrempf Frieder [mailto:frieder.schrempf@kontron.de]
> >> Sent: Wednesday, November 28, 2018 1:58 PM
> >> To: linux-mtd@lists.infradead.org; boris.brezillon@bootlin.com;
> >> linux- spi@vger.kernel.org; Marek Vasut <marek.vasut@gmail.com>;
> Mark
> >> Brown <broonie@kernel.org>; Han Xu <han.xu@nxp.com>
> >> Cc: dwmw2@infradead.org; computersforpeace@gmail.com;
> richard@nod.at;
> >> miquel.raynal@bootlin.com; David Wolfe <david.wolfe@nxp.com>; Fabio
> >> Estevam <fabio.estevam@nxp.com>; Prabhakar Kushwaha
> >> <prabhakar.kushwaha@nxp.com>; Yogesh Narayan Gaur
> >> <yogeshnarayan.gaur@nxp.com>; shawnguo@kernel.org; linux-
> >> kernel@vger.kernel.org
> >> 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@kontron.de>
> >>> ---
> >>> 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 ‘fsl_qspi_select_mem’:
> > drivers/spi/spi-fsl-qspi.c:500:6: warning: unused variable ‘map_addr’
> [-Wunused-variable]
> > u32 map_addr;
> > ^
> > drivers/spi/spi-fsl-qspi.c:499:11: warning: unused variable ‘i’ [-
> 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.

Hi Schrempf, I am reviewing and testing on some i.MX platforms, please hold on for a while for the result.

>
> Thanks,
> Frieder
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