linux-kernel - [PATCH 1/1] spi: Fix SPI slave probe failure

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Date: Mon, 17 Jun 2024 21:00:52 +0530
From: Amit Kumar Mahapatra <amit.kumar-mahapatra@....com>
To: <broonie@...nel.org>
CC: <linux-spi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<git@....com>, <amitrkcian2002@...il.com>, Amit Kumar Mahapatra
	<amit.kumar-mahapatra@....com>
Subject: [PATCH 1/1] spi: Fix SPI slave probe failure

While adding a SPI device, the SPI core ensures that multiple logical CS
doesn't map to the same physical CS. For example, spi->chip_select[0] !=
spi->chip_select[1] and so forth. However, unlike the SPI master, the SPI
slave doesn't have the list of chip selects, this leads to probe failure
when the SPI controller is configured as slave. Update the
__spi_add_device() function to perform this check only if the SPI
controller is configured as master.

Fixes: 4d8ff6b0991d ("spi: Add multi-cs memories support in SPI core")
Signed-off-by: Amit Kumar Mahapatra <amit.kumar-mahapatra@....com>
---
BRANCH: for-next
---
 drivers/spi/spi.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index 9721adf048b5..e7e4201e93b5 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -689,10 +689,12 @@ static int __spi_add_device(struct spi_device *spi)
 	 * Make sure that multiple logical CS doesn't map to the same physical CS.
 	 * For example, spi->chip_select[0] != spi->chip_select[1] and so on.
 	 */
-	for (idx = 0; idx < SPI_CS_CNT_MAX; idx++) {
-		status = spi_dev_check_cs(dev, spi, idx, spi, idx + 1);
-		if (status)
-			return status;
+	if (!spi_controller_is_target(ctlr)) {
+		for (idx = 0; idx < SPI_CS_CNT_MAX; idx++) {
+			status = spi_dev_check_cs(dev, spi, idx, spi, idx + 1);
+			if (status)
+				return status;
+		}
 	}
 
 	/* Set the bus ID string */
-- 
2.17.1