drivers/video: use strings to specify the Freescale DIU monitor port

Instead of using ill-defined numbers (0, 1, and 2) for the monitor port, allow
the user to specify the port by name ("dvi", "lvds", or "dlvds").  This works
on the kernel command line, the module command-line, and the sysfs "monitor"
device.

Note that changing the monitor port does not currently work on the P1022DS,
because the code that talks to the PIXIS FPGA is broken.

Signed-off-by: Timur Tabi <timur@freescale.com>
Acked-by: Anatolij Gustschin <agust@denx.de>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

arch/powerpc/sysdev/fsl_soc.h

@@ -22,15 +22,24 @@ struct device_node;
 extern void fsl_rstcr_restart(char *cmd);
 
 #if defined(CONFIG_FB_FSL_DIU) || defined(CONFIG_FB_FSL_DIU_MODULE)
+
+/* The different ports that the DIU can be connected to */
+enum fsl_diu_monitor_port {
+	FSL_DIU_PORT_DVI,	/* DVI */
+	FSL_DIU_PORT_LVDS,	/* Single-link LVDS */
+	FSL_DIU_PORT_DLVDS	/* Dual-link LVDS */
+};
+
 struct platform_diu_data_ops {
-	unsigned int (*get_pixel_format) (unsigned int bits_per_pixel,
-		int monitor_port);
-	void (*set_gamma_table) (int monitor_port, char *gamma_table_base);
-	void (*set_monitor_port) (int monitor_port);
-	void (*set_pixel_clock) (unsigned int pixclock);
-	ssize_t (*show_monitor_port) (int monitor_port, char *buf);
-	int (*set_sysfs_monitor_port) (int val);
-	void (*release_bootmem) (void);
+	u32 (*get_pixel_format)(enum fsl_diu_monitor_port port,
+		unsigned int bpp);
+	void (*set_gamma_table)(enum fsl_diu_monitor_port port,
+		char *gamma_table_base);
+	void (*set_monitor_port)(enum fsl_diu_monitor_port port);
+	void (*set_pixel_clock)(unsigned int pixclock);
+	enum fsl_diu_monitor_port (*valid_monitor_port)
+		(enum fsl_diu_monitor_port port);
+	void (*release_bootmem)(void);
 };
 
 extern struct platform_diu_data_ops diu_ops;