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[174.29.1.49]) by smtp.gmail.com with ESMTPSA id 5614622812f47-567a9f9115csm27060b6e.11.2026.11.03.13.40.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 03 Nov 2026 13:40:16 -0800 (PST) From: James Hilliard Date: Tue, 03 Nov 2026 14:40:04 -0700 Subject: [PATCH v7 11/12] arm64: dts: allwinner: a523: describe the UART integration X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20261103-submit-h616-uart-fifo-v1-v7-11-c9e248d685c1@gmail.com> References: <20261103-submit-h616-uart-fifo-v1-v7-0-c9e248d685c1@gmail.com> In-Reply-To: <20261103-submit-h616-uart-fifo-v1-v7-0-c9e248d685c1@gmail.com> To: Andy Shevchenko , =?utf-8?q?Ilpo_J=C3=A4rvinen?= , Greg Kroah-Hartman , Jiri Slaby , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Chen-Yu Tsai , Jernej Skrabec , Samuel Holland Cc: linux-kernel@vger.kernel.org, linux-serial@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-sunxi@lists.linux.dev, James Hilliard X-Mailer: b4 0.15.2 Identify the Allwinner UART integration on all eight CPUX controllers. The specific compatible selects FIFO-depth discovery through FCC, allowing the driver to derive the shared DesignWare receive thresholds from each controller's FIFO capacity. Retain snps,dw-apb-uart as a fallback. The common SoC description supplies these UART nodes to the A527 and T527 boards as well. Signed-off-by: James Hilliard --- arch/arm64/boot/dts/allwinner/sun55i-a523.dtsi | 16 ++++++++-------- 1 file changed, 8 insertions(+), 8 deletions(-) diff --git a/arch/arm64/boot/dts/allwinner/sun55i-a523.dtsi b/arch/arm64/boot/dts/allwinner/sun55i-a523.dtsi index 85ef492ffeae..23340b9f58cb 100644 --- a/arch/arm64/boot/dts/allwinner/sun55i-a523.dtsi +++ b/arch/arm64/boot/dts/allwinner/sun55i-a523.dtsi @@ -390,7 +390,7 @@ wdt: watchdog@2050000 { }; uart0: serial@2500000 { - compatible = "snps,dw-apb-uart"; + compatible = "allwinner,sun55i-a523-uart", "snps,dw-apb-uart"; reg = <0x02500000 0x400>; interrupts = ; reg-shift = <2>; @@ -403,7 +403,7 @@ uart0: serial@2500000 { }; uart1: serial@2500400 { - compatible = "snps,dw-apb-uart"; + compatible = "allwinner,sun55i-a523-uart", "snps,dw-apb-uart"; reg = <0x02500400 0x400>; interrupts = ; reg-shift = <2>; @@ -416,7 +416,7 @@ uart1: serial@2500400 { }; uart2: serial@2500800 { - compatible = "snps,dw-apb-uart"; + compatible = "allwinner,sun55i-a523-uart", "snps,dw-apb-uart"; reg = <0x02500800 0x400>; interrupts = ; reg-shift = <2>; @@ -429,7 +429,7 @@ uart2: serial@2500800 { }; uart3: serial@2500c00 { - compatible = "snps,dw-apb-uart"; + compatible = "allwinner,sun55i-a523-uart", "snps,dw-apb-uart"; reg = <0x02500c00 0x400>; interrupts = ; reg-shift = <2>; @@ -442,7 +442,7 @@ uart3: serial@2500c00 { }; uart4: serial@2501000 { - compatible = "snps,dw-apb-uart"; + compatible = "allwinner,sun55i-a523-uart", "snps,dw-apb-uart"; reg = <0x02501000 0x400>; interrupts = ; reg-shift = <2>; @@ -455,7 +455,7 @@ uart4: serial@2501000 { }; uart5: serial@2501400 { - compatible = "snps,dw-apb-uart"; + compatible = "allwinner,sun55i-a523-uart", "snps,dw-apb-uart"; reg = <0x02501400 0x400>; interrupts = ; reg-shift = <2>; @@ -468,7 +468,7 @@ uart5: serial@2501400 { }; uart6: serial@2501800 { - compatible = "snps,dw-apb-uart"; + compatible = "allwinner,sun55i-a523-uart", "snps,dw-apb-uart"; reg = <0x02501800 0x400>; interrupts = ; reg-shift = <2>; @@ -481,7 +481,7 @@ uart6: serial@2501800 { }; uart7: serial@2501c00 { - compatible = "snps,dw-apb-uart"; + compatible = "allwinner,sun55i-a523-uart", "snps,dw-apb-uart"; reg = <0x02501c00 0x400>; interrupts = ; reg-shift = <2>; -- 2.53.0