ARC: [DeviceTree] Convert some Kconfig items to runtime values

* mem size now runtime configured (prev CONFIG_ARC_PLAT_SDRAM_SIZE)
* core cpu clk runtime configured (prev CONFIG_ARC_PLAT_CLK)

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Grant Likely <grant.likely@secretlab.ca>

1 files changed, 6 insertions, 3 deletions

diff --git a/arch/arc/mm/init.c b/arch/arc/mm/init.c
index 682cf5740483..caf797de23fc 100644
--- a/arch/arc/mm/init.c
+++ b/arch/arc/mm/init.c
@@ -25,7 +25,7 @@ char empty_zero_page[PAGE_SIZE] __aligned(PAGE_SIZE);
 EXPORT_SYMBOL(empty_zero_page);
 
 /* Default tot mem from .config */
-static unsigned long arc_mem_sz = CONFIG_ARC_PLAT_SDRAM_SIZE;
+static unsigned long arc_mem_sz = 0x20000000;  /* some default */
 
 /* User can over-ride above with "mem=nnn[KkMm]" in cmdline */
 static int __init setup_mem_sz(char *str)
@@ -41,7 +41,8 @@ early_param("mem", setup_mem_sz);
 
 void __init early_init_dt_add_memory_arch(u64 base, u64 size)
 {
-        pr_err("%s(%llx, %llx)\n", __func__, base, size);
+        arc_mem_sz = size & PAGE_MASK;
+        pr_info("Memory size set via devicetree %ldM\n", TO_MB(arc_mem_sz));
 }
 
 /*
@@ -62,7 +63,9 @@ void __init setup_arch_memory(void)
 
         /*
          * We do it here, so that memory is correctly instantiated
-         * even if "mem=xxx" cmline over-ride is not given
+         * even if "mem=xxx" cmline over-ride is given and/or
+         * DT has memory node. Each causes an update to @arc_mem_sz
+         * and we finally add memory one here
          */
         memblock_add(CONFIG_LINUX_LINK_BASE, arc_mem_sz);