linux-kernel - [PATCH v2 3/4] dt-bindings: ufs: mediatek,ufs: add MT8195 compatible and update clock nodes

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Message-ID: <20250722085721.2062657-3-macpaul.lin@mediatek.com>
Date: Tue, 22 Jul 2025 16:57:19 +0800
From: Macpaul Lin <macpaul.lin@...iatek.com>
To: Alim Akhtar <alim.akhtar@...sung.com>, Avri Altman <avri.altman@....com>,
	Bart Van Assche <bvanassche@....org>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>,
	Matthias Brugger <matthias.bgg@...il.com>, AngeloGioacchino Del Regno
	<angelogioacchino.delregno@...labora.com>, Peter Wang
	<peter.wang@...iatek.com>, Stanley Jhu <chu.stanley@...il.com>, "James E . J
 . Bottomley" <James.Bottomley@...senPartnership.com>, "Martin K . Petersen"
	<martin.petersen@...cle.com>, <linux-scsi@...r.kernel.org>,
	<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <linux-mediatek@...ts.infradead.org>
CC: Bear Wang <bear.wang@...iatek.com>, Pablo Sun <pablo.sun@...iatek.com>,
	Ramax Lo <ramax.lo@...iatek.com>, Macpaul Lin <macpaul.lin@...iatek.com>,
	Macpaul Lin <macpaul@...il.com>, MediaTek Chromebook Upstream
	<Project_Global_Chrome_Upstream_Group@...iatek.com>
Subject: [PATCH v2 3/4] dt-bindings: ufs: mediatek,ufs: add MT8195 compatible and update clock nodes

Add MT8195 UFSHCI compatible string.
Relax the schema to allow between one to eight clocks/clock-names
entries for all MediaTek UFS nodes. Legacy platforms may only need
a few clocks, whereas newer devices such as the MT8195 require
additional clock-gating domains. For MT8195 specifically, enforce
exactly eight clocks and clock-names entries to satisfy its hardware
requirements.

Signed-off-by: Macpaul Lin <macpaul.lin@...iatek.com>
---
 .../devicetree/bindings/ufs/mediatek,ufs.yaml | 42 ++++++++++++++++---
 1 file changed, 36 insertions(+), 6 deletions(-)

Changes for v2:
 - Remove duplicate minItems and maxItems as suggested in the review.
 - Add a description of how the MT8195 hardware differs from earlier
   platforms.

diff --git a/Documentation/devicetree/bindings/ufs/mediatek,ufs.yaml b/Documentation/devicetree/bindings/ufs/mediatek,ufs.yaml
index 20f341d25ebc..1dec54fb00f3 100644
--- a/Documentation/devicetree/bindings/ufs/mediatek,ufs.yaml
+++ b/Documentation/devicetree/bindings/ufs/mediatek,ufs.yaml
@@ -9,21 +9,20 @@ title: Mediatek Universal Flash Storage (UFS) Controller
 maintainers:
   - Stanley Chu <stanley.chu@...iatek.com>
 
-allOf:
-  - $ref: ufs-common.yaml
-
 properties:
   compatible:
     enum:
       - mediatek,mt8183-ufshci
       - mediatek,mt8192-ufshci
+      - mediatek,mt8195-ufshci
 
   clocks:
-    maxItems: 1
+    minItems: 1
+    maxItems: 8
 
   clock-names:
-    items:
-      - const: ufs
+    minItems: 1
+    maxItems: 8
 
   phys:
     maxItems: 1
@@ -47,6 +46,37 @@ required:
 
 unevaluatedProperties: false
 
+allOf:
+  - $ref: ufs-common.yaml
+
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - mediatek,mt8195-ufshci
+    then:
+      properties:
+        clocks:
+          minItems: 8
+        clock-names:
+          items:
+            - const: ufs
+            - const: ufs_aes
+            - const: ufs_tick
+            - const: unipro_sysclk
+            - const: unipro_tick
+            - const: unipro_mp_bclk
+            - const: ufs_tx_symbol
+            - const: ufs_mem_sub
+    else:
+      properties:
+        clocks:
+          maxItems: 1
+        clock-names:
+          items:
+            - const: ufs
+
 examples:
   - |
     #include <dt-bindings/clock/mt8183-clk.h>
-- 
2.45.2