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

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Date:   Mon, 3 Dec 2018 20:54:29 +0000
From:   Han Xu <han.xu@....com>
To:     Schrempf Frieder <frieder.schrempf@...tron.de>,
        Yogesh Narayan Gaur <yogeshnarayan.gaur@....com>,
        "linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
        "boris.brezillon@...tlin.com" <boris.brezillon@...tlin.com>,
        "linux-spi@...r.kernel.org" <linux-spi@...r.kernel.org>,
        Marek Vasut <marek.vasut@...il.com>,
        Mark Brown <broonie@...nel.org>
CC:     "dwmw2@...radead.org" <dwmw2@...radead.org>,
        "computersforpeace@...il.com" <computersforpeace@...il.com>,
        "richard@....at" <richard@....at>,
        "miquel.raynal@...tlin.com" <miquel.raynal@...tlin.com>,
        David Wolfe <david.wolfe@....com>,
        Fabio Estevam <fabio.estevam@....com>,
        Prabhakar Kushwaha <prabhakar.kushwaha@....com>,
        dl-linux-imx <linux-imx@....com>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v6 3/9] spi: Add a driver for the Freescale/NXP QuadSPI
 controller



> -----Original Message-----
> From: Schrempf Frieder <frieder.schrempf@...tron.de>
> Sent: Thursday, November 29, 2018 11:36 AM
> To: Han Xu <han.xu@....com>; Yogesh Narayan Gaur
> <yogeshnarayan.gaur@....com>; linux-mtd@...ts.infradead.org;
> boris.brezillon@...tlin.com; linux-spi@...r.kernel.org; Marek Vasut
> <marek.vasut@...il.com>; Mark Brown <broonie@...nel.org>
> Cc: dwmw2@...radead.org; computersforpeace@...il.com;
> richard@....at; miquel.raynal@...tlin.com; David Wolfe
> <david.wolfe@....com>; Fabio Estevam <fabio.estevam@....com>;
> Prabhakar Kushwaha <prabhakar.kushwaha@....com>;
> shawnguo@...nel.org; linux-kernel@...r.kernel.org
> Subject: Re: [PATCH v6 3/9] spi: Add a driver for the Freescale/NXP QuadSPI
> controller
> 
> Hi Han,
> 
> On 29.11.18 17:30, Han Xu wrote:
> >
> >
> >> -----Original Message-----
> >> From: Schrempf Frieder <frieder.schrempf@...tron.de>
> >> Sent: Thursday, November 29, 2018 5:54 AM
> >> To: Yogesh Narayan Gaur <yogeshnarayan.gaur@....com>; linux-
> >> mtd@...ts.infradead.org; boris.brezillon@...tlin.com; linux-
> >> spi@...r.kernel.org; Marek Vasut <marek.vasut@...il.com>; Mark
> Brown
> >> <broonie@...nel.org>; Han Xu <han.xu@....com>
> >> Cc: dwmw2@...radead.org; computersforpeace@...il.com;
> richard@....at;
> >> miquel.raynal@...tlin.com; David Wolfe <david.wolfe@....com>; Fabio
> >> Estevam <fabio.estevam@....com>; Prabhakar Kushwaha
> >> <prabhakar.kushwaha@....com>; shawnguo@...nel.org;
> >> linux-kernel@...r.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@...tron.de]
> >>>> Sent: Wednesday, November 28, 2018 1:58 PM
> >>>> To: linux-mtd@...ts.infradead.org; boris.brezillon@...tlin.com;
> >>>> linux- spi@...r.kernel.org; Marek Vasut <marek.vasut@...il.com>;
> >> Mark
> >>>> Brown <broonie@...nel.org>; Han Xu <han.xu@....com>
> >>>> Cc: dwmw2@...radead.org; computersforpeace@...il.com;
> >> richard@....at;
> >>>> miquel.raynal@...tlin.com; David Wolfe <david.wolfe@....com>;
> Fabio
> >>>> Estevam <fabio.estevam@....com>; Prabhakar Kushwaha
> >>>> <prabhakar.kushwaha@....com>; Yogesh Narayan Gaur
> >>>> <yogeshnarayan.gaur@....com>; shawnguo@...nel.org; linux-
> >>>> kernel@...r.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@...tron.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.
> 
> Okay, thanks! I'm looking forward to see the results.

Hi Schrempf, I am good with the patch set(with warning fix) and it works fine on i.MX platforms. I will add review and test tags for next version.

I have one questions about the DDR mode support, it there any further plans for DDR mode support rather than SDR only?

> 
> Regards,
> Frieder