gpio/nomadik: support low EMI mode

Low EMI (Electro-Magnetic Interference) mode means lower slew
rate on the signals. The Nomadik GPIO controller supports
this so create an interface to enable it.

Signed-off-by: Rabin Vincent <rabin.vincent@stericsson.com>
Reviewed-by: Srinidhi Kasagar <srinidhi.kasagar@stericsson.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

2 files changed, 7 insertions, 0 deletions

diff --git a/arch/arm/plat-nomadik/include/plat/gpio-nomadik.h b/arch/arm/plat-nomadik/include/plat/gpio-nomadik.h
index 9605bf227df9..3e8b7f16fb78 100644
--- a/arch/arm/plat-nomadik/include/plat/gpio-nomadik.h
+++ b/arch/arm/plat-nomadik/include/plat/gpio-nomadik.h
@@ -29,6 +29,7 @@
 #define NMK_GPIO_SLPC   0x1c
 #define NMK_GPIO_AFSLA  0x20
 #define NMK_GPIO_AFSLB  0x24
+#define NMK_GPIO_LOWEMI 0x28
 
 #define NMK_GPIO_RIMSC  0x40
 #define NMK_GPIO_FIMSC  0x44
diff --git a/arch/arm/plat-nomadik/include/plat/pincfg.h b/arch/arm/plat-nomadik/include/plat/pincfg.h
index 22cb97d2d8ad..da6b1e35e171 100644
--- a/arch/arm/plat-nomadik/include/plat/pincfg.h
+++ b/arch/arm/plat-nomadik/include/plat/pincfg.h
@@ -105,6 +105,12 @@ typedef unsigned long pin_cfg_t;
 #define PIN_SLPM_VAL_LOW        ((1 + 0) << PIN_SLPM_VAL_SHIFT)
 #define PIN_SLPM_VAL_HIGH       ((1 + 1) << PIN_SLPM_VAL_SHIFT)
 
+#define PIN_LOWEMI_SHIFT        25
+#define PIN_LOWEMI_MASK         (0x1 << PIN_LOWEMI_SHIFT)
+#define PIN_LOWEMI(x)           (((x) & PIN_LOWEMI_MASK) >> PIN_LOWEMI_SHIFT)
+#define PIN_LOWEMI_DISABLED     (0 << PIN_LOWEMI_SHIFT)
+#define PIN_LOWEMI_ENABLED      (1 << PIN_LOWEMI_SHIFT)
+
 /* Shortcuts.  Use these instead of separate DIR, PULL, and VAL.  */
 #define PIN_INPUT_PULLDOWN      (PIN_DIR_INPUT | PIN_PULL_DOWN)
 #define PIN_INPUT_PULLUP        (PIN_DIR_INPUT | PIN_PULL_UP)