linux-kernel - Re: [PATCH 0/4] Start getting rid of pdata callbacks with gpio_find_by_chip

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Date:	Fri, 02 Mar 2012 14:36:54 +0530
From:	Rajendra Nayak <rnayak@...com>
To:	Tony Lindgren <tony@...mide.com>
CC:	linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org,
	linux-mmc@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 0/4] Start getting rid of pdata callbacks with gpio_find_by_chip_name()

Hi Tony,

On Friday 02 March 2012 12:25 AM, Tony Lindgren wrote:
> Hi all,
>
> This series adds gpio_find_by_name() that allows finding
> GPIOs on specific gpio_chips. As the GPIO numbers can be
> dynamic, it's hard to find the GPIO numbers from drivers
> using them directly.
>
> So far we've dealt with this using platform specific callbacks,
> but that is messy. This series removes the needs for these
> callbacks for omap hsmmc driver. Further callbacks can be
> removed people are OK with adding gpio_find_by_name().
>
> This series is based on the omap fixes-non-critical that's
> needed for the arch/arm/mach-omap2 parts of this series.

I tested these on my beagle/panda/omap4sdp and they seem to
work fine, also fixing the broken panda card detect (due to
missing card_detect_irq in the board file). There are still
issues however when I build twl4030-gpio as a module, which I
already commented on, and the fact that the init sequence now
works by luck :)
The other issue also is that the multiple insmod/rmmod test
suggested by Russell still fails, since the second time around
the gpio_requests in the board callback fail because they are
not freed when you do a module unload/unbind.
That would need this patch from me to add the .teardown
hooks
http://marc.info/?l=linux-omap&m=133007767831297&w=2

regards,
Rajendra

>
> Regards,
>
> Tony
>
> ---
>
> Tony Lindgren (4):
>        gpiolib: Add gpiochip_find_by_name() and gpio_find_by_chip_name()
>        mmc: omap_hsmmc: Use gpio_find_by_chip_name() for omap_hsmmc_gpio_init()
>        mmc: omap_hsmmc: Use GPIO offset for external GPIO chips
>        mmc: omap_hsmmc: Simplify init for twl6030 MMC card detect
>
>
>   arch/arm/mach-omap2/board-3430sdp.c          |   13 +-
>   arch/arm/mach-omap2/board-4430sdp.c          |   45 --------
>   arch/arm/mach-omap2/board-cm-t35.c           |    8 -
>   arch/arm/mach-omap2/board-devkit8000.c       |    7 -
>   arch/arm/mach-omap2/board-igep0020.c         |    8 -
>   arch/arm/mach-omap2/board-omap3beagle.c      |    9 +-
>   arch/arm/mach-omap2/board-omap3evm.c         |    8 -
>   arch/arm/mach-omap2/board-omap3pandora.c     |   13 +-
>   arch/arm/mach-omap2/board-omap3stalker.c     |    8 -
>   arch/arm/mach-omap2/board-omap3touchbook.c   |    7 -
>   arch/arm/mach-omap2/board-omap4panda.c       |   52 ----------
>   arch/arm/mach-omap2/board-zoom-peripherals.c |    7 -
>   arch/arm/mach-omap2/hsmmc.c                  |    3 +
>   arch/arm/mach-omap2/hsmmc.h                  |    5 +
>   arch/arm/plat-omap/include/plat/mmc.h        |    3 +
>   drivers/gpio/gpio-twl4030.c                  |    2
>   drivers/gpio/gpiolib.c                       |   47 +++++++++
>   drivers/mfd/twl6030-irq.c                    |   33 +++---
>   drivers/mmc/host/omap_hsmmc.c                |  140 +++++++++++++++++++-------
>   include/asm-generic/gpio.h                   |    3 -
>   20 files changed, 204 insertions(+), 217 deletions(-)
>

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