Re: [PATCHv5 2/3] ARM: imx: Add gpio-keys to plat-mxc

From: Uwe Kleine-König
Date: Fri Oct 22 2010 - 15:42:23 EST

Hello Dinh,

On Fri, Oct 22, 2010 at 11:58:16AM -0700, Nguyen Dinh-R00091 wrote:
> >-----Original Message-----
> >From: Uwe Kleine-König [mailto:u.kleine-koenig@xxxxxxxxxxxxxx]
> >Sent: Friday, October 22, 2010 1:28 PM
> >To: Nguyen Dinh-R00091
> >Cc: linux-kernel@xxxxxxxxxxxxxxx; linux-arm-kernel@xxxxxxxxxxxxxxxxxxx; linux@xxxxxxxxxxxxxxxx;
> >s.hauer@xxxxxxxxxxxxxx; valentin.longchamp@xxxxxxx; daniel@xxxxxxxx; grant.likely@xxxxxxxxxxxx;
> >bryan.wu@xxxxxxxxxxxxx; amit.kucheria@xxxxxxxxxxxxx
> >Subject: Re: [PATCHv5 2/3] ARM: imx: Add gpio-keys to plat-mxc
> >
> >On Fri, Oct 22, 2010 at 11:56:14AM -0500, Dinh.Nguyen@xxxxxxxxxxxxx wrote:
> >> From: Dinh Nguyen <Dinh.Nguyen@xxxxxxxxxxxxx>
> >>
> >> Add imx_add_gpio_keys function to add gpio-keys in plat-mxc
> >>
> >> This patch is based on Sascha Hauer's imx/linux-2.6 for-rmk tree.
> >(This information isn't interesting once the patch is in git, so it can
> >better go after the tripple-dash below.)
> >
> >> Signed-off-by: Dinh Nguyen <Dinh.Nguyen@xxxxxxxxxxxxx>
> >Patch 1 depends on this one, so you should swap their order.
> >
> >> ---
> >> arch/arm/plat-mxc/devices/Kconfig | 4 +++
> >> arch/arm/plat-mxc/devices/Makefile | 1 +
> >> arch/arm/plat-mxc/devices/platform-gpio_keys.c | 27 +++++++++++++++++++++++
> >> arch/arm/plat-mxc/include/mach/devices-common.h | 4 +++
> >> arch/arm/plat-mxc/include/mach/iomux-mx51.h | 2 +-
> >> 5 files changed, 37 insertions(+), 1 deletions(-)
> >> create mode 100644 arch/arm/plat-mxc/devices/platform-gpio_keys.c
> >>
> >> diff --git a/arch/arm/plat-mxc/devices/Kconfig b/arch/arm/plat-mxc/devices/Kconfig
> >> index 4047994..f4772e7 100644
> >> --- a/arch/arm/plat-mxc/devices/Kconfig
> >> +++ b/arch/arm/plat-mxc/devices/Kconfig
> >> @@ -9,6 +9,10 @@ config IMX_HAVE_PLATFORM_FLEXCAN
> >> select HAVE_CAN_FLEXCAN
> >> bool
> >>
> >> +config IMX_HAVE_PLATFORM_GPIO_KEYS
> >> + bool
> >> + default y if ARCH_MX51
> >> +
> >> config IMX_HAVE_PLATFORM_IMX_I2C
> >> bool
> >>
> >> diff --git a/arch/arm/plat-mxc/devices/Makefile b/arch/arm/plat-mxc/devices/Makefile
> >> index 0a3c1f0..45aefeb 100644
> >> --- a/arch/arm/plat-mxc/devices/Makefile
> >> +++ b/arch/arm/plat-mxc/devices/Makefile
> >> @@ -1,6 +1,7 @@
> >> obj-$(CONFIG_IMX_HAVE_PLATFORM_ESDHC) += platform-esdhc.o
> >> obj-$(CONFIG_IMX_HAVE_PLATFORM_FEC) += platform-fec.o
> >> obj-$(CONFIG_IMX_HAVE_PLATFORM_FLEXCAN) += platform-flexcan.o
> >> +obj-$(CONFIG_IMX_HAVE_PLATFORM_GPIO_KEYS) += platform-gpio_keys.o
> >> obj-y += platform-imx-dma.o
> >> obj-$(CONFIG_IMX_HAVE_PLATFORM_IMX_I2C) += platform-imx-i2c.o
> >> obj-$(CONFIG_IMX_HAVE_PLATFORM_IMX_SSI) += platform-imx-ssi.o
> >> diff --git a/arch/arm/plat-mxc/devices/platform-gpio_keys.c b/arch/arm/plat-mxc/devices/platform-
> >gpio_keys.c
> >> new file mode 100644
> >> index 0000000..1c53a53
> >> --- /dev/null
> >> +++ b/arch/arm/plat-mxc/devices/platform-gpio_keys.c
> >> @@ -0,0 +1,27 @@
> >> +/*
> >> + * Copyright (C) 2010 Freescale Semiconductor, Inc. All Rights Reserved.
> >> + *
> >> + * This program is free software; you can redistribute it and/or
> >> + * modify it under the terms of the GNU General Public License
> >> + * as published by the Free Software Foundation; either version 2
> >> + * of the License, or (at your option) any later version.
> >> + * This program is distributed in the hope that it will be useful,
> >> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> >> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> >> + * GNU General Public License for more details.
> >> + *
> >> + * You should have received a copy of the GNU General Public License
> >> + * along with this program; if not, write to the Free Software
> >> + * Foundation, Inc., 51 Franklin Street, Fifth Floor,
> >> + * Boston, MA 02110-1301, USA.
> >> + */
> >> +#include <asm/sizes.h>
> >> +#include <mach/hardware.h>
> >> +#include <mach/devices-common.h>
> >> +
> >> +struct platform_device *__init imx_add_gpio_keys(
> >> + const struct gpio_keys_platform_data *pdata)
> >> +{
> >> + return imx_add_platform_device("gpio-keys", -1, NULL,
> >> + 0, pdata, sizeof(*pdata));
> >> +}
> >> diff --git a/arch/arm/plat-mxc/include/mach/devices-common.h b/arch/arm/plat-
> >mxc/include/mach/devices-common.h
> >> index 86d7575..8c6896f 100644
> >> --- a/arch/arm/plat-mxc/include/mach/devices-common.h
> >> +++ b/arch/arm/plat-mxc/include/mach/devices-common.h
> >> @@ -29,6 +29,10 @@ struct platform_device *__init imx_add_flexcan(int id,
> >> resource_size_t irq,
> >> const struct flexcan_platform_data *pdata);
> >>
> >> +#include <linux/gpio_keys.h>
> >> +struct platform_device *__init imx_add_gpio_keys(
> >> + const struct gpio_keys_platform_data *pdata);
> >> +
> >> #include <mach/i2c.h>
> >> struct imx_imx_i2c_data {
> >> int id;
> >> diff --git a/arch/arm/plat-mxc/include/mach/iomux-mx51.h b/arch/arm/plat-mxc/include/mach/iomux-
> >mx51.h
> >> index e46b1c2..7ae27e8 100644
> >> --- a/arch/arm/plat-mxc/include/mach/iomux-mx51.h
> >> +++ b/arch/arm/plat-mxc/include/mach/iomux-mx51.h
> >> @@ -114,7 +114,7 @@ typedef enum iomux_config {
> >> #define MX51_PAD_EIM_A24__GPIO_2_18 IOMUX_PAD(0x450, 0x0bc, 1, 0x0, 0, NO_PAD_CTRL)
> >> #define MX51_PAD_EIM_A25__GPIO_2_19 IOMUX_PAD(0x454, 0x0c0, 1, 0x0, 0, NO_PAD_CTRL)
> >> #define MX51_PAD_EIM_A26__GPIO_2_20 IOMUX_PAD(0x458, 0x0c4, 1, 0x0, 0, NO_PAD_CTRL)
> >> -#define MX51_PAD_EIM_A27__GPIO_2_21 IOMUX_PAD(0x45c, 0x0c8, 1, 0x0, 0, NO_PAD_CTRL)
> >> +#define MX51_PAD_EIM_A27__GPIO_2_21 IOMUX_PAD(0x45c, 0x0c8, 1, 0x0, 0,
> >MX51_GPIO_PAD_CTRL | PAD_CTL_PUS_100K_UP)
> >I share the concerns of Arnaud. MX51_GPIO_PAD_CTRL looks OK,
> >PAD_CTL_PUS_100K_UP does not.
>
> How do you suggest I define this pin for Babbage board only? Do I add to iomux-mx51.h
> #define MX51_BABBAGE_PAD_EIM_A27__GPIO_2_21 IOMUX_PAD(0x45c, 0x0c8, 1, 0x0, 0,MX51_GPIO_PAD_CTRL | PAD_CTL_PUS_100K_UP) ?
>
> Or do I define the pin in the board file with a 100K_UP? Like how eukrea_mbimxsd-baseboard.c did for MBIMXSD_GPIO_3_31?
I'd suggest something local to your machine file. Unfortunately I don't
see an easy way to reuse the generic MX51_PAD_EIM_A27__GPIO_2_21 to
define your local symbol. So I think something like you wrote above
should be fine.

Too bad that

#define MX51_BABBAGE_PAD_EIM_A27__GPIO_2_21 (MX51_PAD_EIM_A27__GPIO_2_21 | PAD_CTL_PUS_100K_UP)

doesn't work.

Best regards
Uwe

--
Pengutronix e.K. | Uwe Kleine-König |
Industrial Linux Solutions | http://www.pengutronix.de/ |
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