1 files changed, 11 insertions, 1 deletions

diff --git a/arch/arm/plat-mxc/include/mach/esdhc.h b/arch/arm/plat-mxc/include/mach/esdhc.h
index a48a9aaa56b1..86003f411755 100644
--- a/arch/arm/plat-mxc/include/mach/esdhc.h
+++ b/arch/arm/plat-mxc/include/mach/esdhc.h
@@ -10,7 +10,17 @@
 #ifndef __ASM_ARCH_IMX_ESDHC_H
 #define __ASM_ARCH_IMX_ESDHC_H
 
+/**
+ * struct esdhc_platform_data - optional platform data for esdhc on i.MX
+ *
+ * strongly recommended for i.MX25/35, not needed for other variants
+ *
+ * @wp_gpio:    gpio for write_protect (-EINVAL if unused)
+ * @cd_gpio:    gpio for card_detect interrupt (-EINVAL if unused)
+ */
+
 struct esdhc_platform_data {
-        unsigned int wp_gpio;   /* write protect pin */
+        unsigned int wp_gpio;
+        unsigned int cd_gpio;
 };
 #endif /* __ASM_ARCH_IMX_ESDHC_H */