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| author | Otavio Salvador <otavio@ossystems.com.br> | 2013-12-16 20:44:00 -0200 |
|---|---|---|
| committer | Stefano Babic <sbabic@denx.de> | 2014-01-03 15:44:05 +0100 |
| commit | 7773fd196918826ebaab769e63a4775607f5256c (patch) | |
| tree | f805601ab56da9bab1477d9bdf64766f9e509beb /arch | |
| parent | 02229827804980e3cce48bf4fce43699046bcf7e (diff) | |
| download | u-boot-imx-7773fd196918826ebaab769e63a4775607f5256c.zip u-boot-imx-7773fd196918826ebaab769e63a4775607f5256c.tar.gz u-boot-imx-7773fd196918826ebaab769e63a4775607f5256c.tar.bz2 | |
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>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/include/asm/imx-common/iomux-v3.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/arm/include/asm/imx-common/iomux-v3.h b/arch/arm/include/asm/imx-common/iomux-v3.h index dc2b3ef..dec11a1 100644 --- a/arch/arm/include/asm/imx-common/iomux-v3.h +++ b/arch/arm/include/asm/imx-common/iomux-v3.h @@ -63,6 +63,8 @@ typedef u64 iomux_v3_cfg_t; #define MUX_SEL_INPUT_SHIFT 59 #define MUX_SEL_INPUT_MASK ((iomux_v3_cfg_t)0xf << MUX_SEL_INPUT_SHIFT) +#define MUX_MODE_SION ((iomux_v3_cfg_t)IOMUX_CONFIG_SION << \ + MUX_MODE_SHIFT) #define MUX_PAD_CTRL(x) ((iomux_v3_cfg_t)(x) << MUX_PAD_CTRL_SHIFT) #define IOMUX_PAD(pad_ctrl_ofs, mux_ctrl_ofs, mux_mode, sel_input_ofs, \ |