MIPS: MTX-1: cleanup and comments

[sfrench/cifs-2.6.git] / arch / mips / alchemy / mtx-1 / board_setup.c

diff --git a/arch/mips/alchemy/mtx-1/board_setup.c b/arch/mips/alchemy/mtx-1/board_setup.c
index def1a75d756144227c82fc328a896aaf5a9c3f94..ff3697387b89c8aacc4ebea568a3402efcfc5127 100644 (file)
--- a/arch/mips/alchemy/mtx-1/board_setup.c
+++ b/arch/mips/alchemy/mtx-1/board_setup.c
@@ -108,14 +108,10 @@ void __init board_setup(void)
 int
 mtx1_pci_idsel(unsigned int devsel, int assert)
 {
-#define MTX_IDSEL_ONLY_0_AND_3 0
-#if MTX_IDSEL_ONLY_0_AND_3
-       if (devsel != 0 && devsel != 3) {
-               printk(KERN_ERR "*** not 0 or 3\n");
-               return 0;
-       }
-#endif
-
+       /* This function is only necessary to support a proprietary Cardbus
+        * adapter on the mtx-1 "singleboard" variant. It triggers a custom
+        * logic chip connected to EXT_IO3 (GPIO1) to suppress IDSEL signals.
+        */
        if (assert && devsel != 0)
                /* Suppress signal to Cardbus */
                alchemy_gpio_set_value(1, 0);   /* set EXT_IO3 OFF */