[PATCH v2 1/1] xilinx: zynqmp: Enable reset_cpu() in SPL

[lukas.funke-oss at weidmueller.com]

From: Lukas Funke <lukas.funke at weidmueller.com>

This commit enables SPL to reset the CPU via PMU-firmware. The usual
reset mechanism requires bl31 to be loaded which may not be the case in
SPL.

Signed-off-by: Lukas Funke <lukas.funke at weidmueller.com>
---

Changes in v2:
- Drop 2/2 since reworking ZYNQMP_FIRMWARE dependency is out-of-scope

 board/xilinx/zynqmp/zynqmp.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/board/xilinx/zynqmp/zynqmp.c b/board/xilinx/zynqmp/zynqmp.c
index f370fb7347a..a129b1dbbbc 100644
--- a/board/xilinx/zynqmp/zynqmp.c
+++ b/board/xilinx/zynqmp/zynqmp.c
@@ -40,6 +40,7 @@
 #include <linux/bitops.h>
 #include <linux/delay.h>
 #include <linux/sizes.h>
+#include <dt-bindings/reset/xlnx-zynqmp-resets.h>
 #include "../common/board.h"
 
 #include "pm_cfg_obj.h"
@@ -285,6 +286,14 @@ int dram_init(void)
 #if !CONFIG_IS_ENABLED(SYSRESET)
 void reset_cpu(void)
 {
+	if (!IS_ENABLED(CONFIG_ZYNQMP_FIRMWARE)) {
+		log_warning("reset failed: ZYNQMP_FIRMWARE disabled");
+		return;
+	}
+
+	xilinx_pm_request(PM_RESET_ASSERT,
+			  ZYNQMP_PM_RESET_START + ZYNQMP_RESET_SOFT,
+			  PM_RESET_ACTION_ASSERT, 0, 0, NULL);
 }
 #endif
 
-- 
2.30.2