[PATCH 8/8] ARM: imx6: Adapt device tree selection in DH board file

[Philip Oberfichtner <pro@denx.de>]

Before this commit device tree selection could rely solely on
differentiating the iMX6 processor variant Q and DL. After adding two new
carrier boards, the DRC02 and the picoITX, the interchangeability of SoMs
makes this approach infeasible.

It is now required to specify the carrier board (dhcom-drc02,
dhcom-picoitx or dhcom-pdk2) at compile time using
CONFIG_DEFAULT_DEVICETREE. The SoM is determined at runtime as before.

Signed-off-by: Philip Oberfichtner <pro@denx.de>
---

 board/dhelectronics/dh_imx6/dh_imx6.c | 22 ++++++++++++++--------
 1 file changed, 14 insertions(+), 8 deletions(-)

diff --git a/board/dhelectronics/dh_imx6/dh_imx6.c b/board/dhelectronics/dh_imx6/dh_imx6.c
index 6059f96e80..c63fc1dd8a 100644
--- a/board/dhelectronics/dh_imx6/dh_imx6.c
+++ b/board/dhelectronics/dh_imx6/dh_imx6.c
@@ -227,14 +227,20 @@ int checkboard(void)
 #ifdef CONFIG_MULTI_DTB_FIT
 int board_fit_config_name_match(const char *name)
 {
-	if (is_mx6dq()) {
-		if (!strcmp(name, "imx6q-dhcom-pdk2"))
-			return 0;
-	} else if (is_mx6sdl()) {
-		if (!strcmp(name, "imx6dl-dhcom-pdk2"))
-			return 0;
-	}
+	/* Determine carrier board at compile time and SoM at runtime */
+	const size_t size = 32;
+	char *car, *som, dt[size];
+
+	car = strchr(CONFIG_DEFAULT_DEVICE_TREE, '-'); /* i.e. -dhcom-drc02 */
+
+	som = is_mx6dq()   ? "imx6q"  :
+	      is_mx6dl()   ? "imx6dl" :
+	      is_mx6solo() ? "imx6s"  : NULL;
+
+	if (!(car && som))
+		return -1;
 
-	return -1;
+	snprintf(dt, size, "%s%s", som, car);
+	return strcmp(name, dt);
 }
 #endif
-- 
2.34.1