linux-kernel - [PATCH 1/3] dt-bindings: memory: mediatek: Add support of unmanaged iommu domain

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Message-Id: <20230130102722.133271-2-abailon@baylibre.com>
Date:   Mon, 30 Jan 2023 11:27:20 +0100
From:   Alexandre Bailon <abailon@...libre.com>
To:     yong.wu@...iatek.com, joro@...tes.org, will@...nel.org
Cc:     robin.murphy@....com, matthias.bgg@...il.com,
        krzysztof.kozlowski@...aro.org, robh+dt@...nel.org,
        iommu@...ts.linux.dev, linux-mediatek@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, Alexandre Bailon <abailon@...libre.com>
Subject: [PATCH 1/3] dt-bindings: memory: mediatek: Add support of unmanaged iommu domain

Currently, the only way to have an unmanaged domain for a device
is having a dedicated iova region or bank.
This adds a new bit to MTK_M4U_ID that allows defining devices
that needs unmanaged iommu domain.

Signed-off-by: Alexandre Bailon <abailon@...libre.com>
---
 include/dt-bindings/memory/mtk-memory-port.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/include/dt-bindings/memory/mtk-memory-port.h b/include/dt-bindings/memory/mtk-memory-port.h
index 2f68a0511a257..86896c776691a 100644
--- a/include/dt-bindings/memory/mtk-memory-port.h
+++ b/include/dt-bindings/memory/mtk-memory-port.h
@@ -7,11 +7,14 @@
 #define __DT_BINDINGS_MEMORY_MTK_MEMORY_PORT_H_
 
 #define MTK_LARB_NR_MAX			32
+#define MTK_UNMANAGED_DEVICE            (1 << 31)
 
 #define MTK_M4U_ID(larb, port)		(((larb) << 5) | (port))
 #define MTK_M4U_TO_LARB(id)		(((id) >> 5) & 0x1f)
 #define MTK_M4U_TO_PORT(id)		((id) & 0x1f)
+#define MTK_M4U_UNMANAGED(id)		((id) & MTK_UNMANAGED_DEVICE)
 
 #define MTK_IFAIOMMU_PERI_ID(port)	MTK_M4U_ID(0, port)
+#define MTK_M4U_UNMANAGED_ID(larb, port) (MTK_M4U_ID(larb, port) | MTK_UNMANAGED_DEVICE)
 
 #endif
-- 
2.38.2