[PATCH] ARM: stm32: Fix livetree conversion on STM32MP15xx DHSOM

[Marek Vasut]

Unlike fdt_node_check_compatible() which returns 0 if node is compatible,
ofnode_device_is_compatible() return true which is non-zero if node is
compatible. The intention of the code is to exit from the function in
case the node is not compatible with "micrel,ks8851-mll". Add the missing
invert into the conditional to reinstate original behavior.

This exposes a follow up problem caused by conversion to DM based FMC2 EBI
driver, where the FMC2 EBI is not configured when accessed by this code.
Probe the KS8851 MAC, which also configures the FMC2 EBI as a dependency,
so that the KS8851 MAC CCR register can be accessed over the FMC2 EBI bus
and checked for EEPROM present bit.

Fixes: 5a605b7c8615 ("board: dhelectronics: stm32mp1: convert to livetree")
Signed-off-by: Marek Vasut <marex at denx.de>
---
Cc: Patrice Chotard <patrice.chotard at foss.st.com>
Cc: Patrick Delaunay <patrick.delaunay at foss.st.com>
Cc: Simon Glass <sjg at chromium.org>
Cc: Tom Rini <trini at konsulko.com>
Cc: u-boot at dh-electronics.com
Cc: u-boot at lists.denx.de
Cc: uboot-stm32 at st-md-mailman.stormreply.com
---
 board/dhelectronics/dh_stm32mp1/board.c | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/board/dhelectronics/dh_stm32mp1/board.c b/board/dhelectronics/dh_stm32mp1/board.c
index ebd45f9053f..4f4f537fee5 100644
--- a/board/dhelectronics/dh_stm32mp1/board.c
+++ b/board/dhelectronics/dh_stm32mp1/board.c
@@ -76,14 +76,25 @@
 
 static bool dh_stm32_mac_is_in_ks8851(void)
 {
-	ofnode node;
+	struct udevice *udev;
 	u32 reg, cider, ccr;
+	char path[256];
+	ofnode node;
+	int ret;
 
 	node = ofnode_path("ethernet1");
 	if (!ofnode_valid(node))
 		return false;
 
-	if (ofnode_device_is_compatible(node, "micrel,ks8851-mll"))
+	ret = ofnode_get_path(node, path, sizeof(path));
+	if (ret)
+		return false;
+
+	ret = uclass_get_device_by_of_path(UCLASS_ETH, path, &udev);
+	if (ret)
+		return false;
+
+	if (!ofnode_device_is_compatible(node, "micrel,ks8851-mll"))
 		return false;
 
 	/*
-- 
2.43.0