linux-kernel - [PATCH 3/4] spi: cadence-qspi: report correct number of chip-select

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Message-Id: <20240209-cdns-qspi-cs-v1-3-a4f9dfed9ab4@bootlin.com>
Date: Fri, 09 Feb 2024 14:45:32 +0100
From: Théo Lebrun <theo.lebrun@...tlin.com>
To: Mark Brown <broonie@...nel.org>
Cc: linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Dhruva Gole <d-gole@...com>, Gregory CLEMENT <gregory.clement@...tlin.com>, 
 Vladimir Kondratiev <vladimir.kondratiev@...ileye.com>, 
 Thomas Petazzoni <thomas.petazzoni@...tlin.com>, 
 Tawfik Bayouk <tawfik.bayouk@...ileye.com>, 
 Théo Lebrun <theo.lebrun@...tlin.com>
Subject: [PATCH 3/4] spi: cadence-qspi: report correct number of
 chip-select

Set the ->num_chipselect field in struct cqspi_st and struct
spi_controller to the current number of chip-select. The value is
dependent on declared flashes in devicetree.

Previously, the num-cs property from devicetree or the maximum value was
being reported.

Signed-off-by: Théo Lebrun <theo.lebrun@...tlin.com>
---
 drivers/spi/spi-cadence-quadspi.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/spi/spi-cadence-quadspi.c b/drivers/spi/spi-cadence-quadspi.c
index e9e3abd2142c..895c950e7fd6 100644
--- a/drivers/spi/spi-cadence-quadspi.c
+++ b/drivers/spi/spi-cadence-quadspi.c
@@ -1621,6 +1621,7 @@ static const struct spi_controller_mem_caps cqspi_mem_caps = {
 
 static int cqspi_setup_flash(struct cqspi_st *cqspi)
 {
+	unsigned int max_cs = cqspi->num_chipselect - 1;
 	struct platform_device *pdev = cqspi->pdev;
 	struct device *dev = &pdev->dev;
 	struct device_node *np = dev->of_node;
@@ -1641,6 +1642,8 @@ static int cqspi_setup_flash(struct cqspi_st *cqspi)
 			dev_err(dev, "Chip select %d out of range.\n", cs);
 			of_node_put(np);
 			return -EINVAL;
+		} else if (cs < max_cs) {
+			max_cs = cs;
 		}
 
 		f_pdata = &cqspi->f_pdata[cs];
@@ -1654,6 +1657,7 @@ static int cqspi_setup_flash(struct cqspi_st *cqspi)
 		}
 	}
 
+	cqspi->num_chipselect = max_cs + 1;
 	return 0;
 }
 
@@ -1865,14 +1869,14 @@ static int cqspi_probe(struct platform_device *pdev)
 	cqspi->current_cs = -1;
 	cqspi->sclk = 0;
 
-	host->num_chipselect = cqspi->num_chipselect;
-
 	ret = cqspi_setup_flash(cqspi);
 	if (ret) {
 		dev_err(dev, "failed to setup flash parameters %d\n", ret);
 		goto probe_setup_failed;
 	}
 
+	host->num_chipselect = cqspi->num_chipselect;
+
 	if (cqspi->use_direct_mode) {
 		ret = cqspi_request_mmap_dma(cqspi);
 		if (ret == -EPROBE_DEFER)

-- 
2.43.0