linux-kernel - [PATCH v2 23/28] spi: s3c64xx: retrieve the FIFO size from the device tree

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Date: Thu, 25 Jan 2024 14:50:01 +0000
From: Tudor Ambarus <tudor.ambarus@...aro.org>
To: broonie@...nel.org,
	andi.shyti@...nel.org,
	arnd@...db.de
Cc: robh+dt@...nel.org,
	krzysztof.kozlowski+dt@...aro.org,
	conor+dt@...nel.org,
	alim.akhtar@...sung.com,
	linux-spi@...r.kernel.org,
	linux-samsung-soc@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-arch@...r.kernel.org,
	andre.draszik@...aro.org,
	peter.griffin@...aro.org,
	semen.protsenko@...aro.org,
	kernel-team@...roid.com,
	willmcvicker@...gle.com,
	Tudor Ambarus <tudor.ambarus@...aro.org>
Subject: [PATCH v2 23/28] spi: s3c64xx: retrieve the FIFO size from the device tree

Allow SoCs that have multiple instances of the SPI IP with different
FIFO sizes to specify their FIFO size via the "samsung,spi-fifosize"
device tree property. With this we can break the dependency between the
SPI alias, the fifo_lvl_mask and the FIFO size.

Signed-off-by: Tudor Ambarus <tudor.ambarus@...aro.org>
---
 drivers/spi/spi-s3c64xx.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/spi/spi-s3c64xx.c b/drivers/spi/spi-s3c64xx.c
index 7a99f6b02319..3e7797d915c5 100644
--- a/drivers/spi/spi-s3c64xx.c
+++ b/drivers/spi/spi-s3c64xx.c
@@ -1114,7 +1114,7 @@ static int s3c64xx_spi_get_fifosize(const struct platform_device *pdev,
 	const struct s3c64xx_spi_port_config *port = sdd->port_conf;
 	const int *fifo_lvl_mask = port->fifo_lvl_mask;
 	struct device_node *np = pdev->dev.of_node;
-	int id;
+	int id, ret;
 
 	if (!np) {
 		if (pdev->id < 0)
@@ -1130,6 +1130,10 @@ static int s3c64xx_spi_get_fifosize(const struct platform_device *pdev,
 		return 0;
 	}
 
+	ret = of_property_read_u32(np, "samsung,spi-fifosize", &sdd->fifosize);
+	if (ret == 0)
+		return 0;
+
 	id = of_alias_get_id(np, "spi");
 	if (id < 0)
 		return dev_err_probe(&pdev->dev, id,
-- 
2.43.0.429.g432eaa2c6b-goog