[PATCHv4 3/3] spi: Convert CONFIG_DM_SPI* to CONFIG_$(SPL_TPL_)DM_SPI*

[Tom Rini <trini@konsulko.com>]

On Wed, Jun 03, 2020 at 12:10:30AM +0530, Jagan Teki wrote:
> On Tue, Jun 2, 2020 at 11:57 PM Tom Rini <trini@konsulko.com> wrote:
> >
> > On Tue, Jun 02, 2020 at 06:59:21PM +0530, Jagan Teki wrote:
> > > On Tue, Jun 2, 2020 at 6:47 PM Zhiqiang Hou <Zhiqiang.Hou@nxp.com> wrote:
> > > >
> > > > From: Lukasz Majewski <lukma@denx.de>
> > > >
> > > > This change allows more fine tuning of driver model based SPI support in
> > > > SPL and TPL. It is now possible to explicitly enable/disable the DM_SPI
> > > > support in SPL and TPL via Kconfig option.
> > > >
> > > > Before this change it was necessary to use:
> > > >     /* SPI Flash Configs */
> > > >     #if defined(CONFIG_SPL_BUILD)
> > > >     #undef CONFIG_DM_SPI
> > > >     #undef CONFIG_DM_SPI_FLASH
> > > >     #undef CONFIG_SPI_FLASH_MTD
> > > >     #endif
> > > >
> > > > in the ./include/configs/<board>.h, which is error prone and shall be
> > > > avoided when we strive to switch to Kconfig.
> > > >
> > > > The goal of this patch:
> > > >
> > > > Provide distinction for DM_SPI support in both U-Boot proper and SPL (TPL).
> > > > Valid use case is when U-Boot proper wants to use DM_SPI, but SPL must
> > > > still support non DM driver.
> > > >
> > > > Another use case is the conversion of non DM/DTS SPI driver to support
> > > > DM/DTS. When such driver needs to work in both SPL and U-Boot proper, the
> > > > distinction is needed in Kconfig (also if SPL version of the driver
> > > > supports OF_PLATDATA).
> > > >
> > > > In the end of the day one would have to support following use cases (in
> > > > single driver file - e.g. mxs_spi.c):
> > > >
> > > > - U-Boot proper driver supporting DT/DTS
> > > > - U-Boot proper driver without DT/DTS support (deprecated)
> > > > - SPL driver without DT/DTS support
> > > > - SPL (and TPL) driver with DT/DTS (when the SoC has enough resources to
> > > >   run full blown DT/DTS)
> > > > - SPL driver with DT/DTS and SPL_OF_PLATDATA (when one have constrained
> > > >   environment with no fitImage and OF_LIBFDT support).
> > > >
> > > > Some boards do require SPI support (with DM) in SPL (TPL) and some only
> > > > have DM_SPI{_FLASH} defined to allow compiling SPL.
> > > >
> > > > This patch converts #ifdef CONFIG_DM_SPI* to #if CONFIG_IS_ENABLED(DM_SPI)
> > > > and provides corresponding defines in Kconfig.
> > > >
> > > > Signed-off-by: Lukasz Majewski <lukma@denx.de>
> > > > Tested-by: Adam Ford <aford173@gmail.com> #da850-evm
> > > > Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
> > > > ---
> > > > V4:
> > > >  - Rebase the patch and remove SPL_DM_SPI from target ls1046 boards.
> > > >
> > > >  arch/arm/Kconfig                            | 11 +++++++++++
> > > >  board/l+g/vinco/vinco.c                     |  4 ++--
> > > >  cmd/sf.c                                    |  4 ++--
> > > >  cmd/spi.c                                   |  6 +++---
> > > >  common/spl/Kconfig                          | 20 ++++++++++++++++++++
> > > >  configs/am57xx_evm_defconfig                |  2 ++
> > > >  configs/am57xx_hs_evm_defconfig             |  2 ++
> > > >  configs/am57xx_hs_evm_usb_defconfig         |  2 ++
> > > >  configs/axm_defconfig                       |  2 ++
> > > >  configs/chromebook_link64_defconfig         |  2 ++
> > > >  configs/chromebook_samus_tpl_defconfig      |  4 ++++
> > > >  configs/dra7xx_evm_defconfig                |  2 ++
> > > >  configs/dra7xx_hs_evm_defconfig             |  2 ++
> > > >  configs/dra7xx_hs_evm_usb_defconfig         |  2 ++
> > > >  configs/j721e_evm_a72_defconfig             |  2 ++
> > > >  configs/j721e_evm_r5_defconfig              |  2 ++
> > > >  configs/ls1021aiot_qspi_defconfig           |  2 ++
> > > >  configs/ls1021aiot_sdcard_defconfig         |  2 ++
> > > >  configs/ls1021aqds_qspi_defconfig           |  1 +
> > > >  configs/ls1021aqds_sdcard_qspi_defconfig    |  1 +
> > > >  configs/ls1021atwr_qspi_defconfig           |  1 +
> > > >  configs/sama5d2_xplained_spiflash_defconfig |  2 ++
> > > >  configs/sama5d3xek_spiflash_defconfig       |  7 ++++---
> > > >  configs/sama5d4_xplained_spiflash_defconfig |  2 ++
> > > >  configs/sama5d4ek_spiflash_defconfig        |  2 ++
> > > >  configs/stm32mp15_basic_defconfig           |  2 ++
> > > >  configs/taurus_defconfig                    |  2 ++
> > > >  drivers/mtd/spi/Makefile                    |  4 ++--
> > > >  drivers/mtd/spi/sf_probe.c                  |  2 +-
> > > >  drivers/net/fm/fm.c                         |  4 ++--
> > > >  drivers/spi/Makefile                        |  2 +-
> > > >  drivers/spi/atmel_spi.c                     |  4 ++--
> > > >  drivers/spi/davinci_spi.c                   |  6 +++---
> > > >  drivers/spi/fsl_dspi.c                      |  5 +++--
> > > >  drivers/spi/kirkwood_spi.c                  |  2 +-
> > > >  drivers/spi/mxc_spi.c                       |  6 +++---
> > > >  drivers/spi/omap3_spi.c                     |  4 ++--
> > >
> > > nondm code on most of the driver will remove in the next version, So I
> > > didn't see any usecase of this conversion here.
> >
> > I think this is still the right direction to go in.  non-DM for SPL is
> > allowed and this is part of the logical steps needed for moving forward
> > with "now pull non-DM driver into own file for SPL" until the efforts to
> > make DM smaller still are ready.  So this series is on my list to test
> > and confirm doesn't change binary size on.
> 
> Sorry, I can't do a similar task over the years, I'm saying about
> nondm part of drivers which doesn't have any footprint issues? You may
> be true for nondm part which has SPL size issues like mxc_spi,
> sh_qspi, rest are fine to move. I'd remove those that part at max for
> next MW.

It comes down to where are we at with everything again?  I'm not saying
you have to be the one to split the code out.  But from what I recall of
the thread last week, for mxc_spi we get back to "i.MX6 is having
problems with size for DM+SPL".  So we can't just "OK, no more i.MX6
support".  Full U-Boot needs to be, and I believe is, converted.

So I guess the next question I have really is for Hou Zhiqiang and is,
do you need this series as part of fixing / converting the eSPI driver
and getting NXP platforms converted?  Thanks!

-- 
Tom
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