ARM: dts: omap4-droid4: Configure uart1 pins

These are needed to use the n_gsm driver for TS 27.010 UART
multiplexing. Note that support for the OOB wake gpio is still
missing so the UART is not yet usable for n_gsm.

Signed-off-by: Tony Lindgren <tony@atomide.com>

diff --git a/arch/arm/boot/dts/omap4-droid4-xt894.dts b/arch/arm/boot/dts/omap4-droid4-xt894.dts
index 33fc6f9..bdf73cb 100644 (file)
--- a/arch/arm/boot/dts/omap4-droid4-xt894.dts
+++ b/arch/arm/boot/dts/omap4-droid4-xt894.dts
@@ -553,6 +553,28 @@
                >;
        };
 
+       /*
+        * Note that the v3.0.8 stock userspace dynamically remuxes uart1
+        * rts pin probably for PM purposes to PIN_INPUT_PULLUP | MUX_MODE7
+        * when not used. If needed, we can add rts pin remux later based
+        * on power measurements.
+        */
+       uart1_pins: pinmux_uart1_pins {
+               pinctrl-single,pins = <
+               /* 0x4a10013c mcspi1_cs2.uart1_cts ag23 */
+               OMAP4_IOPAD(0x13c, PIN_INPUT_PULLUP | MUX_MODE1)
+
+               /* 0x4a10013e mcspi1_cs3.uart1_rts ah23 */
+               OMAP4_IOPAD(0x13e, MUX_MODE1)
+
+               /* 0x4a100140 uart3_cts_rctx.uart1_tx f27 */
+               OMAP4_IOPAD(0x140, PIN_OUTPUT | MUX_MODE1)
+
+               /* 0x4a1001ca dpm_emu14.uart1_rx aa3 */
+               OMAP4_IOPAD(0x1ca, PIN_INPUT_PULLUP | MUX_MODE2)
+               >;
+       };
+
        /* uart3_tx_irtx and uart3_rx_irrx */
        uart3_pins: pinmux_uart3_pins {
                pinctrl-single,pins = <
@@ -622,6 +644,17 @@
        };
 };
 
+/*
+ * As uart1 is wired to mdm6600 with rts and cts, we can use the cts pin for
+ * uart1 wakeirq.
+ */
+&uart1 {
+       pinctrl-names = "default";
+       pinctrl-0 = <&uart1_pins>;
+       interrupts-extended = <&wakeupgen GIC_SPI 72 IRQ_TYPE_LEVEL_HIGH
+                              &omap4_pmx_core 0xfc>;
+};
+
 &uart3 {
        interrupts-extended = <&wakeupgen GIC_SPI 74 IRQ_TYPE_LEVEL_HIGH
                               &omap4_pmx_core 0x17c>;