1 files changed, 40 insertions, 0 deletions
diff --git a/drivers/dma/of_fixups.c b/drivers/dma/of_fixups.c
new file mode 100644
index 0000000000..668313bbfb
--- /dev/null
+++ b/drivers/dma/of_fixups.c
@@ -0,0 +1,40 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <of.h>
+#include <of_address.h>
+#include <driver.h>
+
+static int of_dma_coherent_fixup(struct device_node *root, void *data)
+{
+	struct device_node *soc;
+	enum dev_dma_coherence coherency = (enum dev_dma_coherence)(uintptr_t)data;
+
+	soc = of_find_node_by_path_from(root, "/soc");
+	if (!soc)
+		return -ENOENT;
+
+	of_property_write_bool(soc, "dma-noncoherent", coherency == DEV_DMA_NON_COHERENT);
+	of_property_write_bool(soc, "dma-coherent", coherency == DEV_DMA_COHERENT);
+
+	return 0;
+}
+
+static int of_dma_coherent_fixup_register(void)
+{
+	struct device_node *soc;
+	enum dev_dma_coherence soc_dma_coherency;
+
+	soc = of_find_node_by_path("/soc");
+	if (!soc)
+		return -ENOENT;
+
+	if (of_property_read_bool(soc, "dma-coherent"))
+		soc_dma_coherency = DEV_DMA_COHERENT;
+	else if (of_property_read_bool(soc, "dma-noncoherent"))
+		soc_dma_coherency = DEV_DMA_NON_COHERENT;
+	else
+		soc_dma_coherency = DEV_DMA_COHERENCE_DEFAULT;
+
+	return of_register_fixup(of_dma_coherent_fixup, (void *)(uintptr_t)soc_dma_coherency);
+}
+coredevice_initcall(of_dma_coherent_fixup_register);