[U-Boot] [PATCH 2/4] mtd: vf610_nfc: add Freescale NFC controller configs to Kconfig

[Stefan Agner <stefan@agner.ch>]

On 2015-04-03 22:46, Scott Wood wrote:
> On Fri, 2015-04-03 at 22:42 +0200, Stefan Agner wrote:
>> On 2015-04-03 22:30, Scott Wood wrote:
>> > On Fri, 2015-04-03 at 20:40 +0200, Stefan Agner wrote:
>> >> This commit allows users to enable/disable the Freescale NFC
>> >> controller found in systems like Vybrid (VF610), MPC5125, MCF54418
>> >> or Kinetis K70 via Kconfig with more detailed help docs.
>> >>
>> >> Signed-off-by: Stefan Agner <stefan@agner.ch>
>> >> ---
>> >>  configs/vf610twr_defconfig |  2 ++
>> >>  drivers/mtd/nand/Kconfig   | 15 +++++++++++++++
>> >>  include/configs/vf610twr.h |  3 ---
>> >>  3 files changed, 17 insertions(+), 3 deletions(-)
>> >>
>> >> diff --git a/configs/vf610twr_defconfig b/configs/vf610twr_defconfig
>> >> index 7de374a..5e0ac9f 100644
>> >> --- a/configs/vf610twr_defconfig
>> >> +++ b/configs/vf610twr_defconfig
>> >> @@ -1,3 +1,5 @@
>> >>  CONFIG_SYS_EXTRA_OPTIONS="IMX_CONFIG=board/freescale/vf610twr/imximage.cfg,ENV_IS_IN_MMC"
>> >>  CONFIG_ARM=y
>> >>  CONFIG_TARGET_VF610TWR=y
>> >> +CONFIG_NAND_VF610_NFC=y
>> >> +CONFIG_SYS_NAND_BUSWIDTH_16BIT=y
>> >> diff --git a/drivers/mtd/nand/Kconfig b/drivers/mtd/nand/Kconfig
>> >> index 72825c3..8056c06 100644
>> >> --- a/drivers/mtd/nand/Kconfig
>> >> +++ b/drivers/mtd/nand/Kconfig
>> >> @@ -32,6 +32,21 @@ config NAND_DENALI_SPARE_AREA_SKIP_BYTES
>> >>  	  of OOB area before last ECC sector data starts.  This is potentially
>> >>  	  used to preserve the bad block marker in the OOB area.
>> >>
>> >> +config NAND_VF610_NFC
>> >> +	bool "Support for Freescale NFC for VF610/MPC5125"
>> >> +	select SYS_NAND_SELF_INIT
>> >> +	help
>> >> +	  Enables support for NAND Flash Controller on some Freescale
>> >> +	  processors like the VF610, MPC5125, MCF54418 or Kinetis K70.
>> >> +	  The driver supports a maximum 2k page size. The driver
>> >> +	  currently does not support hardware ECC.
>> >> +
>> >> +config SYS_NAND_BUSWIDTH_16BIT
>> >> +	bool "Use 16-bit NAND interface"
>> >> +	depends on NAND_VF610_NFC
>> >> +	help
>> >> +	  Use 16-bit wide NAND flash interface.
>> >
>> > Why does a generic-sounding config name depend on VF610?  Especially
>> > when README already lists three other drivers as using this option...
>>
>> That option is _not_ meant as being VF610 specific.
>>
>> Since we have the ability to specify dependencies with Kconfig, I think
>> it is nice to have options only available if a driver supports it, hence
>> the depends. So far the VF610 NAND driver is the only one which is in
>> Kconfig and supports it... I would expect that when another driver which
>> supports that option gets migrated, depends will be extended
>> accordingly.
>>
>> However, I just realized that the option end up between Vybrid specific
>> configs because of Patch 3. I will move the option at the very bottom in
>> next revision.
> 
> Could you also add a comment mentioning the other drivers that use it,
> which aren't yet kconfiged?  And then remove the old text from the
> README.

By comment, you mean a Kconfig comment at that option, so the next
stumbles upon it? So I can keep that single depends NAND_VF610_NFC for
now?

Removing CONFIG_SYS_NAND_BUSWIDTH_16BIT from doc/README.nand right? But
with that, the options for the other drivers would be "undocumented" for
the time being... 

--
Stefan