GPIO setting

[Sascha Hauer]

On Mon, Mar 17, 2014 at 03:43:36PM +0200, Ivor Kruger wrote:
> Thanks for the reply. So I take it I need to edit the mux.c file in the
> PCM049(which is the one I use) board directory. I changed the lines as
> below:
> 
> {I2C4_SDA, (PTU | IEN | M0)},					/* i2c4_sda */
> 	{MCSPI1_CLK, (M3)},					/* gpio134 */
> 	{MCSPI1_SOMI, (M3)},					/* gpio135 */
> 	{MCSPI1_SIMO, (M3)},					/* gpio136 */
> 	{MCSPI1_CS0, (M3)},					/* gpio137 */
> 	{MCSPI1_CS1, (M3)},					/* gpio138 */
> 	{MCSPI1_CS2, (M3)},				/* gpio139 */
> 	{MCSPI1_CS3, (M3)},					/* gpio140 */
> 	{UART3_CTS_RCTX, (PTU | IEN | M0)},				/* uart3_tx */
> 
> This still did not allow me to change pin conditions. So in the board.c
> file for the PCM049, I also added these lines to force the config of the
> pins:
> 
>  omap_add_display(&pcm049_fb_data);
> 	gpio_direction_output(135, 1);
> 	gpio_direction_output(136, 1);
> 	gpio_direction_output(137, 1);
> 	gpio_direction_output(138, 1);
> 	gpio_direction_output(139, 1);
> 	gpio_direction_output(140, 1);
> 
> 
> If I then do the gpiolib command inbarebox, the pins are indicated as gpio
> as below:
> 
> gpio  133:     false
> gpio  134:     false
> gpio  135:      true  gpio
> gpio  136:      true  gpio
> gpio  137:      true  gpio
> gpio  138:      true  gpio
> gpio  139:      true  gpio
> gpio  140:      true  gpio
> gpio  141:     false
> gpio  142:     false
> gpio  143:     false
> 
> BUT using the commands:
> 
> gpio_direction_output 135 0
> 
> And 
> 
> gpio_direction_output 135 1
> 
> Still does not change the pin condition.
> 
> Is there something else I still need to do?

Generally that's all you have to do: Configure pinmux and use gpio
functions. I'm not very familiar with OMAPs. How does the translation
from MCSPI1_SOMI to gpio135 work? Are you sure the gpio number is
correct? Is gpio generally M3 and what do the other flags lie IEN and
PTU do? I have no idea what goes wrong here, but that would be the next
places I would look at.

Sascha

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