feat(board/rdedmunds): add support for rdedmunds variant

Add initial support for RD-Edmunds platform. This platform is considered
as a variant of RD-N2 platform with only major change being the CPU
which is Demeter instead of Neoverse-N2.

Signed-off-by: Tony K Nadackal <tony.nadackal@arm.com>
Change-Id: I939d9eac652fa9e76ad002ee5e6107aa79baa013

plat/arm/board/rdn2/platform.mk

@@ -30,7 +30,8 @@ RDN2_BASE		=	plat/arm/board/rdn2
 
 PLAT_INCLUDES		+=	-I${RDN2_BASE}/include/
 
-SGI_CPU_SOURCES		:=	lib/cpus/aarch64/neoverse_n2.S
+SGI_CPU_SOURCES		:=	lib/cpus/aarch64/neoverse_n2.S \
+				lib/cpus/aarch64/neoverse_demeter.S
 
 PLAT_BL_COMMON_SOURCES	+=	${CSS_ENT_BASE}/sgi_plat_v2.c
 

plat/arm/css/sgi/include/sgi_variant.h

@@ -23,6 +23,10 @@
 /* SID Version values for RD-N2 variants */
 #define RD_N2_CFG1_SID_VER_PART_NUM		0x07B6
 
+/* SID Version values for RD-Edmunds */
+#define RD_EDMUNDS_SID_VER_PART_NUM		0x07F2
+#define RD_EDMUNDS_CONFIG_ID			0x1
+
 /* Structure containing SGI platform variant information */
 typedef struct sgi_platform_info {
 	unsigned int platform_id;	/* Part Number of the platform */

plat/arm/css/sgi/sgi_bl31_setup.c

@@ -76,6 +76,7 @@ scmi_channel_plat_info_t *plat_css_get_scmi_info(int channel_id)
 	if (sgi_plat_info.platform_id == RD_N1E1_EDGE_SID_VER_PART_NUM ||
 		sgi_plat_info.platform_id == RD_V1_SID_VER_PART_NUM ||
 		sgi_plat_info.platform_id == RD_N2_SID_VER_PART_NUM ||
+		sgi_plat_info.platform_id == RD_EDMUNDS_SID_VER_PART_NUM ||
 		sgi_plat_info.platform_id == RD_N2_CFG1_SID_VER_PART_NUM) {
 		if (channel_id >= ARRAY_SIZE(plat_rd_scmi_info))
 			panic();