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u-boot/arch/arm/include/asm/imx-common
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Otavio Salvador 7773fd1969 imx: Easy enabling of SION per-pin using MUX_MODE_SION helper macro 
The macro allows easy setting in per-pin, as for example:

,----
| imx_iomux_v3_setup_pad(MX6_PAD_NANDF_D1__GPIO_2_1 | MUX_MODE_SION);
`----

The IOMUX_CONFIG_SION allows for reading PAD value from PSR register.

The following quote from the datasheet:

,----
| ...
| 28.4.2.2 GPIO Write Mode
| The programming sequence for driving output signals should be as follows:
| 1. Configure IOMUX to select GPIO mode (Via IOMUXC), also enable SION if need
| to read loopback pad value through PSR
| 2. Configure GPIO direction register to output (GPIO_GDIR[GDIR] set to 1b).
| 3. Write value to data register (GPIO_DR).
| ...
`----

This fixes the gpio_get_value to properly work when a GPIO is set for
output and has no conflicts.

Thanks for Benoît Thébaudeau <benoit.thebaudeau@advansee.com>, Fabio
Estevam <fabio.estevam@freescale.com> and Eric Bénard
<eric@eukrea.com> for helping to properly trace this down.

Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
Acked-by: Stefano Babic <sbabic@denx.de>
2014-01-03 15:44:05 +01:00
..
boot_mode.h Add GPL-2.0+ SPDX-License-Identifier to source files 2013-07-24 09:44:38 -04:00
dma.h dma: apbh: Add special circular mode for LCD 2013-08-09 21:48:34 +02:00
gpio.h Add GPL-2.0+ SPDX-License-Identifier to source files 2013-07-24 09:44:38 -04:00
imximage.cfg Add GPL-2.0+ SPDX-License-Identifier to source files 2013-07-24 09:44:38 -04:00
iomux-v3.h imx: Easy enabling of SION per-pin using MUX_MODE_SION helper macro 2014-01-03 15:44:05 +01:00
mx5_video.h Add GPL-2.0+ SPDX-License-Identifier to source files 2013-07-24 09:44:38 -04:00
mxc_i2c.h Add GPL-2.0+ SPDX-License-Identifier to source files 2013-07-24 09:44:38 -04:00
regs-apbh.h Add GPL-2.0+ SPDX-License-Identifier to source files 2013-07-24 09:44:38 -04:00
regs-bch.h Add GPL-2.0+ SPDX-License-Identifier to source files 2013-07-24 09:44:38 -04:00
regs-common.h Add GPL-2.0+ SPDX-License-Identifier to source files 2013-07-24 09:44:38 -04:00
regs-gpmi.h Add GPL-2.0+ SPDX-License-Identifier to source files 2013-07-24 09:44:38 -04:00
sata.h nitrogen6x: Move setup_sata to common part 2013-12-17 18:12:14 +01:00