[U-Boot] [PATCH v2 08/22] ARM: uniphier: check DT to determine whether to use support card

[Masahiro Yamada]

If CONFIG_MICRO_SUPPORT_CARD is enabled, U-Boot tries to get access
to the devices on the support card, which may not actually exist.

Check the DT and search for the on-board devices run-time. If the
nodes are not found in DT, then disable the code.

Signed-off-by: Masahiro Yamada <yamada.masah...@socionext.com>
---

 arch/arm/mach-uniphier/micro-support-card.c | 33 +++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/arch/arm/mach-uniphier/micro-support-card.c 
b/arch/arm/mach-uniphier/micro-support-card.c
index 1be5685c6fbf..46879019fdaa 100644
--- a/arch/arm/mach-uniphier/micro-support-card.c
+++ b/arch/arm/mach-uniphier/micro-support-card.c
@@ -18,6 +18,25 @@
 #define MICRO_SUPPORT_CARD_RESET       ((MICRO_SUPPORT_CARD_BASE) + 0xd0034)
 #define MICRO_SUPPORT_CARD_REVISION    ((MICRO_SUPPORT_CARD_BASE) + 0xd00E0)
 
+static bool support_card_found;
+
+static void support_card_detect(void)
+{
+       DECLARE_GLOBAL_DATA_PTR;
+       const void *fdt = gd->fdt_blob;
+       int offset;
+
+       offset = fdt_node_offset_by_compatible(fdt, 0, "smsc,lan9118");
+       if (offset < 0)
+               return;
+
+       offset = fdt_node_offset_by_compatible(fdt, 0, "ns16550a");
+       if (offset < 0)
+               return;
+
+       support_card_found = true;
+}
+
 /*
  * 0: reset deassert, 1: reset
  *
@@ -51,6 +70,11 @@ static int support_card_show_revision(void)
 
 void support_card_init(void)
 {
+       support_card_detect();
+
+       if (!support_card_found)
+               return;
+
        support_card_reset();
        /*
         * After power on, we need to keep the LAN controller in reset state
@@ -67,6 +91,9 @@ void support_card_init(void)
 
 int board_eth_init(bd_t *bis)
 {
+       if (!support_card_found)
+               return 0;
+
        return smc911x_initialize(0, SMC911X_BASE);
 }
 #endif
@@ -161,6 +188,9 @@ static void detect_num_flash_banks(void)
 
 void support_card_late_init(void)
 {
+       if (!support_card_found)
+               return;
+
        detect_num_flash_banks();
 }
 
@@ -221,6 +251,9 @@ void led_puts(const char *s)
        int i;
        u32 val = 0;
 
+       if (!support_card_found)
+               return;
+
        if (!s)
                return;
 
-- 
2.17.1

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