Re: [PATCH 00/11] make struct of_device_id.data const

[Rob Herring <robherring2-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

On 07/13/2012 07:32 AM, y@pengutronix.de wrote:
> From: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
> 
> Hello,
> 
> this series' goal is to make struct of_device_id.data const.
> Conceptually a driver must not modify the data contained there so making
> it const is the right thing.
> 
> This change might introduce warnings because drivers don't use const to
> access the data pointed to by of_device_id.data. In most cases the fix
> is to add some consts.
> 
> This series (apart from adding this const in patch 10) fixes all drivers
> covered by all arm defconfigs (based on v3.5-rc6).
> 

What about other arches?

Rob

> There is one exception though:
> drivers/regulator/twl-regulator.c (build in omap2plus_defconfig) now
> issues:
> 
> 	drivers/regulator/twl-regulator.c: In function 'twlreg_probe':
> 	drivers/regulator/twl-regulator.c:1181: warning: assignment discards qualifiers from pointer target type
> 	drivers/regulator/twl-regulator.c:1190: warning: assignment discards qualifiers from pointer target type
> 
> that is because this driver really modifies his .of_match_table in the
> precence of a traditionally probed device.
> I didn't check deeply, but probably the easiest fix is to remove
> traditional platform support. Don't know if omap is ready for that
> though.
> 
> And also patch 11 adds some more consts that are possible now after
> patch 10.
> 
> This series is available in my git tree at:
> 
> 	git://git.pengutronix.de/git/ukl/linux.git ofdeviceiddata
> 
> Best regards
> Uwe
> 
> Uwe Kleine-König (11):
>   spi/imx: make spi_imx_data.devtype_data member point to const data
>   serial/imx: make imx_port.devdata member point to const data
>   ARM: cache-l2x0: add a const qualifier
>   misc/atmel_tc: make atmel_tc.tcb_config member point to const data
>   gpio/gpio-omap.c: add a const qualifier
>   i2c/i2c-omap: add a const qualifier
>   dmaengine: at_hdmac: add a few const qualifiers
>   spi/spi-omap2-mcspi: add a const qualifier
>   mmc/omap_hsmmc: add a const qualifier
>   of: add const to struct of_device_id.data
>   gpio/gpio-omap: make platformdata used as of_device_id.data const
> 
>  arch/arm/mm/cache-l2x0.c        |    2 +-
>  drivers/dma/at_hdmac.c          |    4 ++--
>  drivers/gpio/gpio-omap.c        |    8 ++++----
>  drivers/i2c/busses/i2c-omap.c   |    3 ++-
>  drivers/mmc/host/omap_hsmmc.c   |    2 +-
>  drivers/spi/spi-imx.c           |    2 +-
>  drivers/spi/spi-omap2-mcspi.c   |    2 +-
>  drivers/tty/serial/imx.c        |    2 +-
>  include/linux/atmel_tc.h        |    2 +-
>  include/linux/mod_devicetable.h |    2 +-
>  10 files changed, 15 insertions(+), 14 deletions(-)
> 

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