linux-kernel - [PATCH v2] riscv: dts: spacemit: uart: remove sec

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Message-Id: <20250902-02-k1-uart-clock-v2-1-f146918d44f6@gentoo.org>
Date: Tue, 02 Sep 2025 20:26:58 +0800
From: Yixun Lan <dlan@...too.org>
To: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, 
 Paul Walmsley <paul.walmsley@...ive.com>, 
 Palmer Dabbelt <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>, 
 Alexandre Ghiti <alex@...ti.fr>
Cc: Alex Elder <elder@...cstar.com>, devicetree@...r.kernel.org, 
 linux-riscv@...ts.infradead.org, spacemit@...ts.linux.dev, 
 linux-kernel@...r.kernel.org, Yixun Lan <dlan@...too.org>
Subject: [PATCH v2] riscv: dts: spacemit: uart: remove sec_uart1 device
 node

sec_uart1 is not available from Linux, and no clock is implemented in
CCF framework, thus 'make dtbs_check' will pop up this warning message:

  serial@...12000: 'clock-names' is a required property

Removing the node from device tree to silence the DT check warning.

Signed-off-by: Yixun Lan <dlan@...too.org>
---
This patch try to resolve the DT check warning due to
the clock for sec_uart1 is not implemented.
---
Changes in v2:
- remove sec_uart1 node instead of marking it as reserved
- Link to v1: https://lore.kernel.org/r/20250718-02-k1-uart-clock-v1-1-698e884aa717@gentoo.org
---
 arch/riscv/boot/dts/spacemit/k1.dtsi | 11 +----------
 1 file changed, 1 insertion(+), 10 deletions(-)

diff --git a/arch/riscv/boot/dts/spacemit/k1.dtsi b/arch/riscv/boot/dts/spacemit/k1.dtsi
index abde8bb07c95c5a745736a2dd6f0c0e0d7c696e4..3094f75ed13badfc3db333be2b3195c61f57fddf 100644
--- a/arch/riscv/boot/dts/spacemit/k1.dtsi
+++ b/arch/riscv/boot/dts/spacemit/k1.dtsi
@@ -777,16 +777,7 @@ uart9: serial@...17800 {
 				status = "disabled";
 			};
 
-			sec_uart1: serial@...12000 {
-				compatible = "spacemit,k1-uart",
-					     "intel,xscale-uart";
-				reg = <0x0 0xf0612000 0x0 0x100>;
-				interrupts = <43>;
-				clock-frequency = <14857000>;
-				reg-shift = <2>;
-				reg-io-width = <4>;
-				status = "reserved"; /* for TEE usage */
-			};
+			/* sec_uart1: 0xf0612000, not available from Linux */
 		};
 
 		multimedia-bus {

---
base-commit: 8f5ae30d69d7543eee0d70083daf4de8fe15d585
change-id: 20250718-02-k1-uart-clock-0beb9ef10fe0

Best regards,
-- 
Yixun Lan