On Wed, May 11, 2016 at 9:34 AM, Neil Armstrong [off-list ref] wrote:

Add pinctrl and gpio control support to Oxford Semiconductor OXNAS SoC Family.
This version supports the ARM926EJ-S based OX810SE SoC with 34 IO pins.

Signed-off-by: Neil Armstrong <redacted>

I tried implementing a .get_direction() callback for the Oxnas GPIO
(this is good to have, for debugfs and for the new userspace ABI).

However:

+/* GPIO Registers */
+#define INPUT_VALUE    0x00
+#define IRQ_PENDING    0x0c
+#define OUTPUT_SET     0x14
+#define OUTPUT_CLEAR   0x18
+#define OUTPUT_EN_SET  0x1c
+#define OUTPUT_EN_CLEAR        0x20
+#define RE_IRQ_ENABLE  0x28
+#define FE_IRQ_ENABLE  0x2c

No pure OUTPUT_EN register to read the direction from?
Or is it one of the undocumented ones?

Could you take a stab at implementing .get_direction() and
send a patch?

Yours,
Linus Walleij