[U-Boot] [PATCH v6 00/76] mtd: Add SPI-NOR core support

[Jagan Teki]

Hi Simon,

On 18 February 2016 at 01:38, Jagan Teki <jteki at openedev.com> wrote:
> Hi Simon,
>
> On 18 February 2016 at 00:30, Simon Glass <sjg at chromium.org> wrote:
>> Hi Jagan,
>>
>> On 14 February 2016 at 13:46, Jagan Teki <jteki at openedev.com> wrote:
>>> Compared to previous patch series this series adds spi-nor
>>> core with spi-nor controller drivers are of "mtd uclass"
>>>
>>> This is whole series for all spi-nor related changes, and while
>>> series tested on spansion spi-nor chip.
>>>
>>> Know issue:
>>> - arch/x86/lib/mrccache.c uses dm_spi_flash_ops, this need to fix.
>>>
>>> Why this framework:
>>>
>>> Some of the SPI device drivers at drivers/spi not a real
>>> spi controllers, Unlike normal/generic SPI controllers they
>>> operates only with SPI-NOR flash devices. these were technically
>>> termed as SPI-NOR controllers, Ex: drivers/spi/fsl_qspi.c
>>>
>>> The problem with these were resides at drivers/spi is entire
>>> SPI layer becomes SPI-NOR flash oriented which is absolutely
>>> a wrong indication where SPI layer getting effected more with
>>> flash operations - So this SPI-NOR core will resolve this issue
>>> by separating all SPI-NOR flash operations from spi layer and
>>> creats a generic layer called SPI-NOR core which can be used to
>>> interact SPI-NOR to SPI driver interface layer and the SPI-NOR
>>> controller driver. The idea is taken from Linux spi-nor framework.
>>>
>>> Before SPI-NOR:
>>>
>>> -----------------------
>>>         cmd/sf.c
>>> -----------------------
>>>         spi_flash.c
>>> -----------------------
>>>         sf_probe.c
>>> -----------------------
>>>         spi-uclass
>>> -----------------------
>>>         spi drivers
>>> -----------------------
>>>         SPI NOR chip
>>> -----------------------
>>>
>>> After SPI-NOR:
>>>
>>> ------------------------------
>>>         cmd/sf.c
>>> ------------------------------
>>>         spi-nor.c
>>> -------------------------------
>>> m25p80.c        spi nor drivers
>>> -------------------------------
>>> spi-uclass      SPI NOR chip
>>> -------------------------------
>>> spi drivers
>>> -------------------------------
>>> SPI NOR chip
>>> -------------------------------
>>>
>>> SPI-NOR with MTD:
>>>
>>> ------------------------------
>>>         cmd/sf.c
>>> ------------------------------
>>>         MTD core
>>> ------------------------------
>>>         spi-nor.c
>>> -------------------------------
>>> m25p80.c        spi nor drivers
>>> -------------------------------
>>> spi-uclass      SPI NOR chip
>>> -------------------------------
>>> spi drivers
>>> -------------------------------
>>> SPI NOR chip
>>> -------------------------------
>>>
>>> drivers/mtd/spi-nor/spi-nor.c: spi-nor core
>>> drivers/mtd/spi-nor/m25p80.c: mtd uclass driver
>>> which is an interface layer b/w spi-nor core drivers/spi
>>> drivers/mtd/spi-nor/fsl_qspi.c: spi-nor controller driver(mtd uclass)
>>>
>>> Changes for v6:
>>> - Fixed git bisectable issues, with buildman.
>>> - Fixed spi-nor compilation issues
>>> - newly designed changes.
>>>
>>> Changes for v5:
>>> - newly designed changes
>>>
>>> Testing:
>>> $ git clone git://git.denx.de/u-boot-spi.git
>>> $ cd u-boot-spi
>>> $ git checkout -b spi-nor origin/spi-nor
>>
>> I see quite a large rodata increase at this commit. Is it necessary?
>>
>> 67: configs: Use CONFIG_SPI_NOR_MISC
>>        arm: (for 1/1 boards)  all +2434.0  bss +56.0  rodata +1994.0
>> text +384.0
>>
>> There are also bisectability problems (build errors for some commits)
>> - e.g. chromebook_jerry.
>
> Yes, this I missed defining SPI_NOR config will update that.

u-boot-spi/spi-nor updated, let me know if you find any build issues.

-- 
Jagan.