[U-Boot] [PATCH] Davinci: Table driven pinmux configuration

[Nick Thompson <nick.thompson@gefanuc.com>]

Davinci: Table driven pinmux configuration

Add code to allow pinmux_config tables to be grouped and configured
as a single resource. This removes multiple calls to the pinmux
configuration code from board_init and allows pinmuxes to be
individually configured and added by data manipulation only.

All related #ifdefs can the be removed from board_init code and
since the compiler optimises away statics, #ifdefs can be reduced in
the data definitions as well.

Signed-off-by: Nick Thompson <nick.thompson@gefanuc.com>
---
Applies to u-boot-ti:

 board/davinci/common/misc.c |   31 +++++++++++++++++++++++++++++++
 board/davinci/common/misc.h |   13 +++++++++++++
 2 files changed, 44 insertions(+), 0 deletions(-)

diff --git a/board/davinci/common/misc.c b/board/davinci/common/misc.c
index 9fab76f..25ca326 100644
--- a/board/davinci/common/misc.c
+++ b/board/davinci/common/misc.c
@@ -155,3 +155,34 @@ int davinci_configure_pin_mux(const struct pinmux_config *pins,
 
 	return 0;
 }
+
+/*
+ * Configure multiple pinmux resources.
+ *
+ * Takes an pinmux_resource array of pinmux_config and pin counts:
+ *
+ * const struct pinmux_resource pinmuxes[] = {
+ *	PINMUX_ITEM(uart_pins),
+ *	PINMUX_ITEM(i2c_pins),
+ * };
+ *
+ * The number of items in the array must be passed (ARRAY_SIZE can provide
+ * this value conveniently).
+ *
+ * Each item entry is configured in the defined order. If configuration
+ * of any item fails, -1 is returned and none of the following items are
+ * configured. On success, 0 is returned.
+ */
+int davinci_configure_pin_mux_items(const struct pinmux_resource *item,
+				    const int n_items)
+{
+	int i;
+
+	for (i = 0; i < n_items; i++) {
+		if (davinci_configure_pin_mux(item[i].pins,
+					      item[i].n_pins) != 0)
+			return -1;
+	}
+
+	return 0;
+}
diff --git a/board/davinci/common/misc.h b/board/davinci/common/misc.h
index f6d8b1b..329c369 100644
--- a/board/davinci/common/misc.h
+++ b/board/davinci/common/misc.h
@@ -34,8 +34,21 @@ struct pinmux_config {
 	unsigned char	field;		/* field number */
 };
 
+/* pin table definition */
+struct pinmux_resource {
+	const struct pinmux_config	*pins;
+	const int 			n_pins;
+};
+
+#define PINMUX_ITEM(item) { \
+				.pins = item, \
+				.n_pins = ARRAY_SIZE(item) \
+			  }
+
 int dvevm_read_mac_address(uint8_t *buf);
 void dv_configure_mac_address(uint8_t *rom_enetaddr);
 int davinci_configure_pin_mux(const struct pinmux_config *pins, int n_pins);
+int davinci_configure_pin_mux_items(const struct pinmux_resource *item,
+				    int n_items);
 
 #endif /* __MISC_H */