exynos5250: Add a pinmux function to set up i2s bus 0

This bus is hooked up on snow and, as it's the only bus hooked up on some
other boards, having it available in firmware to test is handy.

Change-Id: Icb48b9af4a67d382bd6fbce1e4c6a320d811d365
Signed-off-by: Gabe Black <gabeblack@google.com>
Reviewed-on: https://gerrit.chromium.org/gerrit/64877
Reviewed-by: Ronald G. Minnich <rminnich@chromium.org>
Commit-Queue: Stefan Reinauer <reinauer@google.com>
Tested-by: Stefan Reinauer <reinauer@google.com>
Reviewed-on: http://review.coreboot.org/4438
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>

src/cpu/samsung/exynos5250/pinmux.c

@@ -244,6 +244,16 @@ void exynos_pinmux_dphpd(void)
 	gpio_set_pull(GPIO_X07, GPIO_PULL_NONE);
 }
 
+void exynos_pinmux_i2s0(void)
+{
+	int i;
+
+	for (i = 0; i < 5; i++) {
+		gpio_cfg_pin(GPIO_Z0 + i, GPIO_FUNC(0x02));
+		gpio_set_pull(GPIO_Z0 + i, GPIO_PULL_NONE);
+	}
+}
+
 void exynos_pinmux_i2s1(void)
 {
 	int i;

src/cpu/samsung/exynos5250/pinmux.h

@@ -52,6 +52,7 @@ void exynos_pinmux_i2c7(void);
 
 void exynos_pinmux_dphpd(void);
 
+void exynos_pinmux_i2s0(void);
 void exynos_pinmux_i2s1(void);
 
 #endif