linux-kernel - [PATCH v6 10/15] MIPS: ingenic: Detect machtype from SoC compatible string

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Date:   Fri,  5 Jan 2018 19:25:08 +0100
From:   Paul Cercueil <paul@...pouillou.net>
To:     Ralf Baechle <ralf@...ux-mips.org>
Cc:     Maarten ter Huurne <maarten@...ewalker.org>,
        Paul Burton <paul.burton@...s.com>,
        linux-kernel@...r.kernel.org, linux-mips@...ux-mips.org,
        Paul Cercueil <paul@...pouillou.net>
Subject: [PATCH v6 10/15] MIPS: ingenic: Detect machtype from SoC compatible string

Previously, the mips_machtype variable was always initialized
to MACH_INGENIC_JZ4740 even if running on different SoCs.

Signed-off-by: Paul Cercueil <paul@...pouillou.net>
---
 arch/mips/jz4740/prom.c  |  1 -
 arch/mips/jz4740/setup.c | 26 ++++++++++++++++++++++----
 2 files changed, 22 insertions(+), 5 deletions(-)

 v2: No change
 v3: No change
 v4: No change
 v5: Use SPDX license identifier
 v6: Init mips_machtype from DT compatible string instead of using
     MIPS_MACHINE

diff --git a/arch/mips/jz4740/prom.c b/arch/mips/jz4740/prom.c
index a62dd8e6ecf9..eb9f2f97bedb 100644
--- a/arch/mips/jz4740/prom.c
+++ b/arch/mips/jz4740/prom.c
@@ -25,7 +25,6 @@
 
 void __init prom_init(void)
 {
-	mips_machtype = MACH_INGENIC_JZ4740;
 	fw_init_cmdline();
 }
 
diff --git a/arch/mips/jz4740/setup.c b/arch/mips/jz4740/setup.c
index 6d0152321819..cd89536fbba1 100644
--- a/arch/mips/jz4740/setup.c
+++ b/arch/mips/jz4740/setup.c
@@ -53,16 +53,30 @@ static void __init jz4740_detect_mem(void)
 	add_memory_region(0, size, BOOT_MEM_RAM);
 }
 
+static unsigned long __init get_board_mach_type(const void *fdt)
+{
+	if (!fdt_node_check_compatible(fdt, 0, "ingenic,jz4780"))
+		return MACH_INGENIC_JZ4780;
+	if (!fdt_node_check_compatible(fdt, 0, "ingenic,jz4770"))
+		return MACH_INGENIC_JZ4770;
+
+	return MACH_INGENIC_JZ4740;
+}
+
 void __init plat_mem_setup(void)
 {
 	int offset;
 
+	if (!early_init_dt_scan(__dtb_start))
+		return;
+
 	jz4740_reset_init();
-	__dt_setup_arch(__dtb_start);
 
 	offset = fdt_path_offset(__dtb_start, "/memory");
 	if (offset < 0)
 		jz4740_detect_mem();
+
+	mips_machtype = get_board_mach_type(__dtb_start);
 }
 
 void __init device_tree_init(void)
@@ -75,10 +89,14 @@ void __init device_tree_init(void)
 
 const char *get_system_type(void)
 {
-	if (IS_ENABLED(CONFIG_MACH_JZ4780))
+	switch (mips_machtype) {
+	case MACH_INGENIC_JZ4780:
 		return "JZ4780";
-
-	return "JZ4740";
+	case MACH_INGENIC_JZ4770:
+		return "JZ4770";
+	default:
+		return "JZ4740";
+	}
 }
 
 void __init arch_init_irq(void)
-- 
2.11.0