of_dma_get_max_cpu_address(9)

💖 of_dma_get_max_cpu_address(9) 💖

okay so this is the Kernel API Manual page for of_dma_get_max_cpu_address(9) — yes bestie, we're in kernel-land and it's giving device-tree energy 🌳✨

🌸 NAME 🌸

of_dma_get_max_cpu_address — gets the highest CPU address suitable for DMA.

🎀 SYNOPSIS 🎀

phys_addr_t of_dma_get_max_cpu_address (struct device_node *np );

🦋 ARGUMENTS 🦋

• np — the node to start searching from, or NULL to start from the root.

✨ DESCRIPTION ✨

So here's the vibe: this function gets the highest CPU physical address that is addressable by all DMA masters in the sub-tree pointed to by np — or the whole tree if NULL is passed. 🌈

If no DMA constrained device is found, it returns PHYS_ADDR_MAX. That's the whole story, no cap. 💅

👑 SEE ALSO 👑

• Kernel file ./drivers/of/address.c
• of_translate_dma_region(9)
• of_property_read_reg(9)
• of_dma_get_range(9)
• of_dma_is_coherent(9)
• of_mmio_is_nonposted(9)
• of_address_to_resource(9)
• of_iomap(9)

and that's the page, bestie 🫶 source/version: ./drivers/of, dated October 2026, manual tag of_dma_get_max_cpu_address(9) — periodt. 💖