SFI: add support for v0.81 spec

There are 2 major changes from v0.81 to v0.7:
1. Consolidating the SPIB/I2CB tables into a new DEVS table,
   which is more expandable and can support other bus types
   than spi/i2c.
2. Creating a new GPIO table, which list all the GPIO pins
   used in the platform.

However, to avoid breaking current platforms who use SFI v0.7
version firmware, the definitions for SPIB/I2CB will still
be kept for a while

Signed-off-by: Feng Tang <feng.tang@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

drivers/sfi/sfi_core.c

@@ -390,7 +390,7 @@ void __init sfi_init(void)
 	if (sfi_disabled)
 		return;
 
-	pr_info("Simple Firmware Interface v0.7 http://simplefirmware.org\n");
+	pr_info("Simple Firmware Interface v0.81 http://simplefirmware.org\n");
 
 	if (sfi_find_syst() || sfi_parse_syst() || sfi_platform_init())
 		disable_sfi();

include/linux/sfi.h

@@ -73,6 +73,8 @@
 #define SFI_SIG_SPIB		"SPIB"
 #define SFI_SIG_I2CB		"I2CB"
 #define SFI_SIG_GPEM		"GPEM"
+#define SFI_SIG_DEVS		"DEVS"
+#define SFI_SIG_GPIO		"GPIO"
 
 #define SFI_SIGNATURE_SIZE	4
 #define SFI_OEM_ID_SIZE		6
@@ -145,6 +147,27 @@ struct sfi_rtc_table_entry {
 	u32	irq;
 } __packed;
 
+struct sfi_device_table_entry {
+	u8	type;		/* bus type, I2C, SPI or ...*/
+#define SFI_DEV_TYPE_SPI	0
+#define SFI_DEV_TYPE_I2C	1
+#define SFI_DEV_TYPE_UART	2
+#define SFI_DEV_TYPE_HSI	3
+#define SFI_DEV_TYPE_IPC	4
+
+	u8	host_num;	/* attached to host 0, 1...*/
+	u16	addr;
+	u8	irq;
+	u32	max_freq;
+	char	name[16];
+} __packed;
+
+struct sfi_gpio_table_entry {
+	char	controller_name[16];
+	u16	pin_no;
+	char	pin_name[16];
+} __packed;
+
 struct sfi_spi_table_entry {
 	u16	host_num;	/* attached to host 0, 1...*/
 	u16	cs;		/* chip select */
@@ -166,7 +189,6 @@ struct sfi_gpe_table_entry {
 	u16	phys_id;	/* physical GPE id */
 } __packed;
 
-
 typedef int (*sfi_table_handler) (struct sfi_table_header *table);
 
 #ifdef CONFIG_SFI