fsl_esdhc: Add device tree fixups

This patch implements fdt_fixup_esdhc() function that is used to fixup
the device tree.

The function adds status = "disabled" propery if esdhc pins muxed away,
otherwise it fixups clock-frequency for esdhc nodes.

Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Acked-by: Kim Phillips <kim.phillips@freescale.com>

drivers/mmc/fsl_esdhc.c

@@ -28,11 +28,13 @@
 #include <config.h>
 #include <common.h>
 #include <command.h>
+#include <hwconfig.h>
 #include <mmc.h>
 #include <part.h>
 #include <malloc.h>
 #include <mmc.h>
 #include <fsl_esdhc.h>
+#include <fdt_support.h>
 #include <asm/io.h>
 
 
@@ -346,3 +348,20 @@ int fsl_esdhc_mmc_init(bd_t *bis)
 {
 	return esdhc_initialize(bis);
 }
+
+void fdt_fixup_esdhc(void *blob, bd_t *bd)
+{
+	const char *compat = "fsl,esdhc";
+	const char *status = "okay";
+
+	if (!hwconfig("esdhc")) {
+		status = "disabled";
+		goto out;
+	}
+
+	do_fixup_by_compat_u32(blob, compat, "clock-frequency",
+			       gd->sdhc_clk, 1);
+out:
+	do_fixup_by_compat(blob, compat, "status", status,
+			   strlen(status) + 1, 1);
+}

include/fsl_esdhc.h

@@ -26,6 +26,8 @@
 #ifndef  __FSL_ESDHC_H__
 #define	__FSL_ESDHC_H__
 
+#include <asm/errno.h>
+
 /* FSL eSDHC-specific constants */
 #define SYSCTL			0x0002e02c
 #define SYSCTL_INITA		0x08000000
@@ -140,6 +142,12 @@
 #define ESDHC_HOSTCAPBLT_DMAS	0x00400000
 #define ESDHC_HOSTCAPBLT_HSS	0x00200000
 
+#ifdef CONFIG_FSL_ESDHC
 int fsl_esdhc_mmc_init(bd_t *bis);
+void fdt_fixup_esdhc(void *blob, bd_t *bd);
+#else
+static inline int fsl_esdhc_mmc_init(bd_t *bis) { return -ENOSYS; }
+static inline void fdt_fixup_esdhc(void *blob, bd_t *bd) {}
+#endif /* CONFIG_FSL_ESDHC */
 
 #endif  /* __FSL_ESDHC_H__ */