Re: [PATCH v2 00/25] mtd: nand: refactor the NAND subsystem (part 1)

From: Brian Norris
Date: Tue Dec 08 2015 - 19:36:34 EST

Hi,

On Tue, Dec 01, 2015 at 12:02:57PM +0100, Boris Brezillon wrote:
> Hello,
>
> This huge series aims at clarifying the relationship between the mtd and
> nand_chip structures and hiding NAND framework internals to NAND
> controller drivers.
>
> The first part of the series provide an mtd_to_nand() helper to hide the
> way mtd and nand_chip are linked together.
>
> The second part of the series embeds the mtd structure into the nand_chip
> one so that NAND controller drivers don't have to bother allocating the
> MTD device and linking it with the NAND chip.
>
> The last part of the series hides accesses to the chip->priv field behind
> two helper functions.
>
> This allows removal of some of the boilerplate code done in all NAND
> controller drivers, but most importantly, it unifies a bit the way NAND
> chip structures are instantiated (even though we still have two different
> kinds of drivers: those embedding the nand_chip struct into their private
> nand chip representation, and those allocating two different structures
> and linking them together with the chip->priv field).
>
> As said in the title, this refactoring is only the first step. I plan to
> rework the NAND controller / NAND chip separation for pretty much the same
> reasons: clarifying the separation between the two concepts, and getting
> rid of more boilerplate code in NAND controller drivers.
>
> Stay tuned ;-).
>
> Best Regards,
>
> Boris
>
> Changes since v1:
> - dropped already applied patches
> - fixed some typos
> - manually fixed some modifications omitted by the coccinelle scripts
> - manually reworked modifactions done by coccinelle scripts to improve
> readability and fix coding style issues
>
> Boris Brezillon (25):
> ARM: nand: make use of mtd_to_nand() where appropriate

I've sent this (+ the introduction of mtd_to_nand()) in a pull request
to arm-soc, as well as to l2-mtd.git.

> blackfin: nand: make use of mtd_to_nand() where appropriate
> cris: nand: make use of mtd_to_nand() where appropriate
> mips: nand: make use of mtd_to_nand() where appropriate

I've based these on v4.4-rc1 and brought them into l2-mtd.git, in case
any arch/{blackfin,cris,mips}/ people want to pull them in too.

> sh: nand: make use of mtd_to_nand() where appropriate
> mtd: nand: make use of mtd_to_nand() in NAND core code
> mtd: nand: make use of mtd_to_nand() in NAND drivers
> staging: mt29f_spinand: make use of mtd_to_nand()
> mtd: nand: embed an mtd_info structure into nand_chip
> mtd: nand: add nand_to_mtd() helper

Pulled the rest up to here into l2-mtd.git.

> coccinelle: nand: detect and correct drivers embedding an mtd_info
> object

I believe Julia had comments on this. That probably would go through the
kbuild tree in the end anyway (?).

> mtd: nand: use the mtd instance embedded in struct nand_chip

There's still at least one problem in this patch (commented on the
patch). It touches a lot of drivers, so any extra review would be great.

> mtd: nand: update the documentation to reflect framework changes
> staging: mt29f_spinand: use the mtd instance embedded in struct
> nand_chip
> cris: nand: use the mtd instance embedded in struct nand_chip
> mtd: nand: update mtd_to_nand()
> mtd: nand: remove useless mtd->priv = chip assignments
> cris: nand: remove useless mtd->priv = chip assignments
> staging: mt29f_spinand: remove useless mtd->priv = chip assignment
> mtd: nand: simplify nand_dt_init() usage
> mtd: nand: kill the chip->flash_node field
> mtd: nand: add helpers to access ->priv
> ARM: make use of nand_set/get_controller_data() helpers
> mtd: nand: make use of nand_set/get_controller_data() helpers
> staging: mt29f_spinand: make use of nand_set/get_controller_data()
> helpers

All the rest look good to me. I'll wait until I get a good copy of patch
12 before taking them.

Brian

> Documentation/DocBook/mtdnand.tmpl | 31 +++---
> arch/arm/mach-ep93xx/snappercl15.c | 4 +-
> arch/arm/mach-ep93xx/ts72xx.c | 4 +-
> arch/arm/mach-imx/mach-qong.c | 2 +-
> arch/arm/mach-ixp4xx/ixdp425-setup.c | 6 +-
> arch/arm/mach-omap1/board-nand.c | 2 +-
> arch/arm/mach-orion5x/ts78xx-setup.c | 6 +-
> arch/arm/mach-pxa/balloon3.c | 2 +-
> arch/arm/mach-pxa/em-x270.c | 2 +-
> arch/arm/mach-pxa/palmtx.c | 2 +-
> arch/blackfin/mach-bf537/boards/stamp.c | 2 +-
> arch/blackfin/mach-bf561/boards/acvilon.c | 2 +-
> arch/cris/arch-v32/drivers/mach-a3/nandflash.c | 8 +-
> arch/cris/arch-v32/drivers/mach-fs/nandflash.c | 8 +-
> arch/mips/alchemy/devboards/db1200.c | 2 +-
> arch/mips/alchemy/devboards/db1300.c | 2 +-
> arch/mips/alchemy/devboards/db1550.c | 2 +-
> arch/mips/pnx833x/common/platform.c | 2 +-
> arch/mips/rb532/devices.c | 2 +-
> arch/sh/boards/mach-migor/setup.c | 2 +-
> drivers/mtd/nand/ams-delta.c | 26 ++---
> drivers/mtd/nand/atmel_nand.c | 118 ++++++++++----------
> drivers/mtd/nand/au1550nd.c | 40 +++----
> drivers/mtd/nand/bcm47xxnflash/bcm47xxnflash.h | 1 -
> drivers/mtd/nand/bcm47xxnflash/main.c | 9 +-
> drivers/mtd/nand/bcm47xxnflash/ops_bcm4706.c | 34 +++---
> drivers/mtd/nand/bf5xx_nand.c | 25 ++---
> drivers/mtd/nand/brcmnand/brcmnand.c | 54 +++++----
> drivers/mtd/nand/cafe_nand.c | 51 +++++----
> drivers/mtd/nand/cmx270_nand.c | 20 ++--
> drivers/mtd/nand/cs553x_nand.c | 30 +++--
> drivers/mtd/nand/davinci_nand.c | 37 ++++---
> drivers/mtd/nand/denali.c | 67 ++++++-----
> drivers/mtd/nand/denali.h | 1 -
> drivers/mtd/nand/diskonchip.c | 148 ++++++++++++-------------
> drivers/mtd/nand/docg4.c | 91 ++++++++-------
> drivers/mtd/nand/fsl_elbc_nand.c | 61 +++++-----
> drivers/mtd/nand/fsl_ifc_nand.c | 71 ++++++------
> drivers/mtd/nand/fsl_upm.c | 31 +++---
> drivers/mtd/nand/fsmc_nand.c | 69 ++++++------
> drivers/mtd/nand/gpio.c | 19 ++--
> drivers/mtd/nand/gpmi-nand/gpmi-lib.c | 2 +-
> drivers/mtd/nand/gpmi-nand/gpmi-nand.c | 67 ++++++-----
> drivers/mtd/nand/gpmi-nand/gpmi-nand.h | 1 -
> drivers/mtd/nand/hisi504_nand.c | 48 ++++----
> drivers/mtd/nand/jz4740_nand.c | 14 +--
> drivers/mtd/nand/lpc32xx_mlc.c | 32 +++---
> drivers/mtd/nand/lpc32xx_slc.c | 42 ++++---
> drivers/mtd/nand/mpc5121_nfc.c | 52 +++++----
> drivers/mtd/nand/mxc_nand.c | 76 +++++++------
> drivers/mtd/nand/nand_base.c | 102 +++++++++--------
> drivers/mtd/nand/nand_bbt.c | 32 +++---
> drivers/mtd/nand/nand_bch.c | 4 +-
> drivers/mtd/nand/nand_ecc.c | 4 +-
> drivers/mtd/nand/nandsim.c | 35 +++---
> drivers/mtd/nand/ndfc.c | 53 ++++-----
> drivers/mtd/nand/nuc900_nand.c | 25 ++---
> drivers/mtd/nand/omap2.c | 109 ++++++++++--------
> drivers/mtd/nand/orion_nand.c | 13 +--
> drivers/mtd/nand/pasemi_nand.c | 21 ++--
> drivers/mtd/nand/plat_nand.c | 16 +--
> drivers/mtd/nand/pxa3xx_nand.c | 70 ++++++------
> drivers/mtd/nand/r852.c | 41 +++----
> drivers/mtd/nand/r852.h | 1 -
> drivers/mtd/nand/s3c2410.c | 32 +++---
> drivers/mtd/nand/sh_flctl.c | 9 +-
> drivers/mtd/nand/sharpsl.c | 23 ++--
> drivers/mtd/nand/sm_common.c | 2 +-
> drivers/mtd/nand/socrates_nand.c | 24 ++--
> drivers/mtd/nand/sunxi_nand.c | 40 ++++---
> drivers/mtd/nand/tmio_nand.c | 13 ++-
> drivers/mtd/nand/txx9ndfmc.c | 25 ++---
> drivers/mtd/nand/vf610_nfc.c | 9 +-
> drivers/mtd/nand/xway_nand.c | 4 +-
> drivers/staging/mt29f_spinand/mt29f_spinand.c | 19 ++--
> include/linux/mtd/nand.h | 26 ++++-
> include/linux/mtd/sh_flctl.h | 3 +-
> scripts/coccinelle/api/nand-priv-no-mtd.cocci | 91 +++++++++++++++
> 78 files changed, 1179 insertions(+), 1097 deletions(-)
> create mode 100644 scripts/coccinelle/api/nand-priv-no-mtd.cocci
>
> --
> 2.1.4
>
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