[U-Boot] [PATCH v3 3/8] imx: Easy enabling of SION per-pin using MUX_MODE_SION helper macro

[Stefano Babic]

On 16/12/2013 23:44, Otavio Salvador wrote:
> 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 at advansee.com>, Fabio
> Estevam <fabio.estevam at freescale.com> and Eric Bénard
> <eric at eukrea.com> for helping to properly trace this down.
> 
> Signed-off-by: Otavio Salvador <otavio at ossystems.com.br>
> ---

Applied to u-boot-imx, thanks !

Best regards,
Stefano Babic



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