[U-Boot] [PATCH v2 1/2] spi: nxp_fspi: new driver for the FlexSPI controller

[Michael Walle <michael@walle.cc>]

Hi Priyanka, Hi Jagan, Hi Vingesh,

Am 2019-11-29 08:49, schrieb Michael Walle:
> Am 2019-11-29 06:03, schrieb Priyanka Jain:
>>> -----Original Message-----
>>> From: U-Boot <u-boot-bounces@lists.denx.de> On Behalf Of Michael 
>>> Walle
>>> Sent: Saturday, November 2, 2019 11:56 PM
>>> To: u-boot at lists.denx.de
>>> Subject: [U-Boot] [PATCH v2 1/2] spi: nxp_fspi: new driver for the 
>>> FlexSPI
>>> controller
>>> 
>>> This is a port of the kernel's spi-nxp-fspi driver. It uses the new 
>>> spi-mem
>>> interface and does not expose the more generic spi-xfer interface. 
>>> The source
>>> was taken from the v5.3-rc3 tag.
>>> 
>>> The port was straightforward:
>>> - remove the interrupt handling and the completion by busy polling 
>>> the
>>>   controller
>>> - remove locks
>>> - move the setup of the memory windows into claim_bus()
>>> - move the setup of the speed into set_speed()
>>> - port the device tree bindings from the original fspi_probe() to
>>>   ofdata_to_platdata()
>>> 
>>> There were only some style change fixes, no change in any logic. For 
>>> example,
>>> there are busy loops where the return code is not handled correctly, 
>>> eg. only
>>> prints a warning with WARN_ON(). This port intentionally left most 
>>> functions
>>> unchanged to ease future bugfixes.
>>> 
>>> This was tested on a custom LS1028A board. Because the LS1028A 
>>> doesn't
>>> have proper clock framework support, changing the clock speed was not
>>> tested. This also means that it is not possible to change the SPI 
>>> speed on
>>> LS1028A for now (neither is it possible in the linux driver).
>>> 
>>> Signed-off-by: Michael Walle <michael@walle.cc>
>>> Reviewed-by: Jagan Teki <jagan@amarulasolutions.com>
>>> ---
>>> changes since v1:
>>> - fixed typo, thanks Jagan
>>> 
>>> drivers/spi/Kconfig    |   7 +
>>> drivers/spi/Makefile   |   1 +
>>> drivers/spi/nxp_fspi.c | 997 
>>> +++++++++++++++++++++++++++++++++++++++++
>>> 3 files changed, 1005 insertions(+)
>>> create mode 100644 drivers/spi/nxp_fspi.c
>>> 
>>> diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig index
>>> 7be867d5b6..ad20309df8 100644
>>> --- a/drivers/spi/Kconfig
>>> +++ b/drivers/spi/Kconfig
>>> @@ -192,6 +192,13 @@ config MVEBU_A3700_SPI
>>> 	  used to access the SPI NOR flash on platforms embedding this
>>> 	  Marvell IP core.
>>> 
>>> +config NXP_FSPI
>>> +	bool "NXP FlexSPI driver"
>>> +	depends on SPI_MEM
>>> +	help
>>> +	  Enable the NXP FlexSPI (FSPI) driver. This driver can be used to
>>> +	  access the SPI NOR flash on platforms embedding this NXP IP core.
>>> +
>>> config PIC32_SPI
>>> 	bool "Microchip PIC32 SPI driver"
>>> 	depends on MACH_PIC32
>>> diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile index
>>> ae4f2958f8..52462e19a3 100644
>>> --- a/drivers/spi/Makefile
>>> +++ b/drivers/spi/Makefile
>>> @@ -43,6 +43,7 @@ obj-$(CONFIG_MSCC_BB_SPI) += mscc_bb_spi.o
>>> obj-$(CONFIG_MVEBU_A3700_SPI) += mvebu_a3700_spi.o
>>> obj-$(CONFIG_MXC_SPI) += mxc_spi.o
>>> obj-$(CONFIG_MXS_SPI) += mxs_spi.o
>>> +obj-$(CONFIG_NXP_FSPI) += nxp_fspi.o
>>> obj-$(CONFIG_ATCSPI200_SPI) += atcspi200_spi.o
>>> obj-$(CONFIG_OMAP3_SPI) += omap3_spi.o
>>> obj-$(CONFIG_PIC32_SPI) += pic32_spi.o
>>> diff --git a/drivers/spi/nxp_fspi.c b/drivers/spi/nxp_fspi.c new file 
>>> mode
>>> 100644 index 0000000000..b808418eb6
>>> --- /dev/null
>>> +++ b/drivers/spi/nxp_fspi.c
>>> @@ -0,0 +1,997 @@
>>> +// SPDX-License-Identifier: GPL-2.0+
>>> +/*
>>> + * NXP FlexSPI(FSPI) controller driver.
>>> + *
>>> + * Copyright (c) 2019 Michael Walle <michael@walle.cc>
>> The file is ported from Linux.
>> Any particular reason of adding copyright?
> 
> so what? the "original" copyright is mentioned. It is certainly not
> the case that there wasn't any changes. I get the feeling that you
> just want to have "your" NXP copyright here. If any, there should be
> the copyright of the original spi-nxp-qspi.c driver, which is not NXP.
> But instead NXP - lets say borrowed - much of its code for "their"
> spi-nxp-fspi.c and _dropped_ all former copyrights.
> 
> 
>> Can you change this to Author/Ported-by?
> Nope.

ping. there was already tested-by's and reviewd-by's.

> 
> -michael
> 
>>> + *
>>> + * This driver was originally ported from the linux kernel v5.4-rc3,
>>> +which had
>>> + * the following notes:
>>> + *
>> <snip>

btw the original copyright is here after the snip. FWIW i can move that
one also to the top. but I certainly won't drop mine.

-michael