linux-kernel - [PATCH v2 1/7] ARM: dts: samsung: exynos3250: specify the SPI FIFO depth

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Message-ID: <20240216140449.2564625-2-tudor.ambarus@linaro.org>
Date: Fri, 16 Feb 2024 14:04:43 +0000
From: Tudor Ambarus <tudor.ambarus@...aro.org>
To: krzysztof.kozlowski+dt@...aro.org,
	robh@...nel.org,
	conor+dt@...nel.org
Cc: alim.akhtar@...sung.com,
	devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	broonie@...nel.org,
	andi.shyti@...nel.org,
	semen.protsenko@...aro.org,
	kernel-team@...roid.com,
	willmcvicker@...gle.com,
	andre.draszik@...aro.org,
	peter.griffin@...aro.org,
	Tudor Ambarus <tudor.ambarus@...aro.org>
Subject: [PATCH v2 1/7] ARM: dts: samsung: exynos3250: specify the SPI FIFO depth

Up to now the SPI alias was used as an index into an array defined in
the SPI driver to determine the SPI FIFO depth. Drop the dependency on
the SPI alias and specify the SPI FIFO depth directly into the SPI node.

exynos3250.dtsi defines the following aliases:
	spi0 = &spi_0;
	spi1 = &spi_1;
spi-s3c64xx.c driver defines the following fifo_lvl_mask for the
"samsung,exynos4210-spi" compatible:
	.fifo_lvl_mask  = { 0x1ff, 0x7F, 0x7F },
Thus spi0 was considered having a 256 byte FIFO depth, and spi1 a 64
byte FIFO depth. Update device tree with these FIFO depths. No
functional change expected.

Signed-off-by: Tudor Ambarus <tudor.ambarus@...aro.org>
---
 arch/arm/boot/dts/samsung/exynos3250.dtsi | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm/boot/dts/samsung/exynos3250.dtsi b/arch/arm/boot/dts/samsung/exynos3250.dtsi
index 3f1015edab43..b6c3826a9424 100644
--- a/arch/arm/boot/dts/samsung/exynos3250.dtsi
+++ b/arch/arm/boot/dts/samsung/exynos3250.dtsi
@@ -826,6 +826,7 @@ spi_0: spi@...20000 {
 			samsung,spi-src-clk = <0>;
 			pinctrl-names = "default";
 			pinctrl-0 = <&spi0_bus>;
+			fifo-depth = <256>;
 			status = "disabled";
 		};
 
@@ -842,6 +843,7 @@ spi_1: spi@...30000 {
 			samsung,spi-src-clk = <0>;
 			pinctrl-names = "default";
 			pinctrl-0 = <&spi1_bus>;
+			fifo-depth = <64>;
 			status = "disabled";
 		};
 
-- 
2.44.0.rc0.258.g7320e95886-goog