linux-kernel - [PATCH 1/2] ARM: dts: microchip: sama7d65: fix uart fifo size to 32

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Message-ID: <20251114103313.20220-1-nicolas.ferre@microchip.com>
Date: Fri, 14 Nov 2025 11:33:12 +0100
From: <nicolas.ferre@...rochip.com>
To: Alexandre Belloni <alexandre.belloni@...tlin.com>, Claudiu Beznea
	<claudiu.beznea@...on.dev>
CC: <linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
	Ryan Wanner <ryan.wanner@...rochip.com>, Cristian Birsan
	<cristian.birsan@...rochip.com>, Nicolas Ferre <nicolas.ferre@...rochip.com>,
	<stable@...r.kernel.org>
Subject: [PATCH 1/2] ARM: dts: microchip: sama7d65: fix uart fifo size to 32

From: Nicolas Ferre <nicolas.ferre@...rochip.com>

On some flexcom nodes related to uart, the fifo sizes were wrong: fix
them to 32 data.  Note that product datasheet is being reviewed to fix
inconsistency, but this value is validated by product's designers.

Fixes: 261dcfad1b59 ("ARM: dts: microchip: add sama7d65 SoC DT")
Fixes: b51e4aea3ecf ("ARM: dts: microchip: sama7d65: Add FLEXCOMs to sama7d65 SoC")
Cc: <stable@...r.kernel.org> # 6.16+
Signed-off-by: Nicolas Ferre <nicolas.ferre@...rochip.com>
---
 arch/arm/boot/dts/microchip/sama7d65.dtsi | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/arm/boot/dts/microchip/sama7d65.dtsi b/arch/arm/boot/dts/microchip/sama7d65.dtsi
index e53e2dd6d530..cd2cf9a6f40b 100644
--- a/arch/arm/boot/dts/microchip/sama7d65.dtsi
+++ b/arch/arm/boot/dts/microchip/sama7d65.dtsi
@@ -557,7 +557,7 @@ uart4: serial@200 {
 				dma-names = "tx", "rx";
 				atmel,use-dma-rx;
 				atmel,use-dma-tx;
-				atmel,fifo-size = <16>;
+				atmel,fifo-size = <32>;
 				atmel,usart-mode = <AT91_USART_MODE_SERIAL>;
 				status = "disabled";
 			};
@@ -618,7 +618,7 @@ uart6: serial@200 {
 				clocks = <&pmc PMC_TYPE_PERIPHERAL 40>;
 				clock-names = "usart";
 				atmel,usart-mode = <AT91_USART_MODE_SERIAL>;
-				atmel,fifo-size = <16>;
+				atmel,fifo-size = <32>;
 				status = "disabled";
 			};
 		};
@@ -643,7 +643,7 @@ uart7: serial@200 {
 				dma-names = "tx", "rx";
 				atmel,use-dma-rx;
 				atmel,use-dma-tx;
-				atmel,fifo-size = <16>;
+				atmel,fifo-size = <32>;
 				atmel,usart-mode = <AT91_USART_MODE_SERIAL>;
 				status = "disabled";
 			};
-- 
2.43.0