linux-kernel - [PATCH v2 05/12] spi: s3c64xx: retrieve the FIFO depth from the device tree

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Date: Mon, 12 Feb 2024 14:03:24 +0000
From: Tudor Ambarus <tudor.ambarus@...aro.org>
To: broonie@...nel.org,
	robh@...nel.org,
	andi.shyti@...nel.org,
	krzysztof.kozlowski@...aro.org,
	semen.protsenko@...aro.org,
	conor+dt@...nel.org
Cc: alim.akhtar@...sung.com,
	linux-spi@...r.kernel.org,
	linux-samsung-soc@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	andre.draszik@...aro.org,
	peter.griffin@...aro.org,
	kernel-team@...roid.com,
	willmcvicker@...gle.com,
	devicetree@...r.kernel.org,
	arnd@...db.de,
	Tudor Ambarus <tudor.ambarus@...aro.org>
Subject: [PATCH v2 05/12] spi: s3c64xx: retrieve the FIFO depth from the device tree

There are SoCs that configure different FIFO depths for their instances
of the SPI IP. See the fifo_lvl_mask defined for exynos4_spi_port_config
for example:
        .fifo_lvl_mask  = { 0x1ff, 0x7F, 0x7F },
The first instance of the IP is configured with 256 bytes FIFOs, whereas
the last two are configured with 64 bytes FIFOs.

Instead of mangling with the .fifo_lvl_mask and its dependency of the DT
alias ID, allow such SoCs to determine the FIFO depth via the
``fifo-depth`` DT property.

Signed-off-by: Tudor Ambarus <tudor.ambarus@...aro.org>
---
 drivers/spi/spi-s3c64xx.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/spi/spi-s3c64xx.c b/drivers/spi/spi-s3c64xx.c
index 72572e23cde5..b1c63f75021d 100644
--- a/drivers/spi/spi-s3c64xx.c
+++ b/drivers/spi/spi-s3c64xx.c
@@ -1263,7 +1263,9 @@ static int s3c64xx_spi_probe(struct platform_device *pdev)
 		sdd->port_id = pdev->id;
 	}
 
-	sdd->fifo_depth = FIFO_DEPTH(sdd);
+	if (of_property_read_u32(pdev->dev.of_node, "fifo-depth",
+				 &sdd->fifo_depth))
+		sdd->fifo_depth = FIFO_DEPTH(sdd);
 
 	s3c64xx_spi_set_fifomask(sdd);
 
-- 
2.43.0.687.g38aa6559b0-goog