[PATCH 8/9] ARM: rockchip: pass device tree to TF-A

[Michael Tretter <m.tretter@pengutronix.de>]

The upstream OP-TEE expects a device tree to be able to initialize the
dynamic shared memory. Therefore, barebox should pass a device tree that
contains memory nodes through the TF-A to OP-TEE.

Unfortunately, the downstream TF-A fails to start if barebox passes its
device tree and it is not possible to detect if the loaded TF-A is able
to handle the device tree. Add a config option to pass the device tree
if it is possible.

Signed-off-by: Michael Tretter <m.tretter@pengutronix.de>
---
 arch/arm/mach-rockchip/Kconfig | 13 +++++++++++++
 arch/arm/mach-rockchip/atf.c   | 15 ++++-----------
 pbl/Kconfig                    |  1 +
 3 files changed, 18 insertions(+), 11 deletions(-)

diff --git a/arch/arm/mach-rockchip/Kconfig b/arch/arm/mach-rockchip/Kconfig
index 98dfd11c182b9fee6e3c958653ad4fa8a7d98d84..257c13bcf4846e805a7803105c71edeff92c534d 100644
--- a/arch/arm/mach-rockchip/Kconfig
+++ b/arch/arm/mach-rockchip/Kconfig
@@ -141,6 +141,19 @@ config ARCH_ROCKCHIP_ATF
 	  useful for debugging early startup, but for all other cases,
 	  say y here.
 
+config ARCH_ROCKCHIP_ATF_PASS_FDT
+	bool "Pass device tree to TF-A"
+	depends on ARCH_ROCKCHIP_ATF
+	help
+	  Enable this option if you are using an upstream OP-TEE that uses the
+	  device tree to initialize dynamic shared memory, which is passed
+	  through the upstream TF-A.
+
+	  Disable the option if you are using a downstream TF-A since it
+	  doesn't always cope with device trees. Supposedly this happens if the
+	  device tree is too large, for example if CONFIG_OF_OVERLAY_LIVE is
+	  enabled.
+
 config ARCH_ROCKCHIP_OPTEE
 	bool "Build rockchip OP-TEE binary into barebox"
 	depends on ARCH_ROCKCHIP_ATF
diff --git a/arch/arm/mach-rockchip/atf.c b/arch/arm/mach-rockchip/atf.c
index cfa6df043b34c0f36919048237c7ecf33dfe0724..12cf13717b6972c2eafc5a044ae8d0b4de029c32 100644
--- a/arch/arm/mach-rockchip/atf.c
+++ b/arch/arm/mach-rockchip/atf.c
@@ -186,18 +186,11 @@ void __noreturn rk3588_barebox_entry(void *fdt)
 		rk3588_lowlevel_init();
 		rockchip_store_bootrom_iram(IOMEM(RK3588_IRAM_BASE));
 
-		/*
-		 * The downstream TF-A doesn't cope with our device tree when
-		 * CONFIG_OF_OVERLAY_LIVE is enabled, supposedly because it is
-		 * too big for some reason. Otherwise it doesn't have any visible
-		 * effect if we pass a device tree or not, except that the TF-A
-		 * fills in the ethernet MAC address into the device tree.
-		 * The upstream TF-A doesn't use the device tree at all.
-		 *
-		 * Pass NULL for now until we have a good reason to pass a real
-		 * device tree.
-		 */
+#ifdef CONFIG_ARCH_ROCKCHIP_ATF_PASS_FDT
+		rk3588_atf_load_bl31(fdt);
+#else
 		rk3588_atf_load_bl31(NULL);
+#endif
 		/* not reached when CONFIG_ARCH_ROCKCHIP_ATF */
 	}
 
diff --git a/pbl/Kconfig b/pbl/Kconfig
index 489b2001a855d62e11a2159311332b0e67f3a754..3dfc7de3e80da12a6313e84175275070274b9a5d 100644
--- a/pbl/Kconfig
+++ b/pbl/Kconfig
@@ -63,6 +63,7 @@ config PBL_CLOCKSOURCE
 config PBL_FDT_MIN_SIZE
 	hex
 	default 0x0
+	default 0x60000 if ARCH_ROCKCHIP_ATF_PASS_FDT
 	prompt "Minimum size of the FDT blob"
 	help
 	  The TF-A or OP-TEE may modify the FDT or add nodes to the FDT. This

-- 
2.39.5