linux-kernel - [PATCH 4/6] spi: don't check spi_controller::num

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Message-Id: <20241012-spi_multi_cs_cleanup-v1-4-dc491113880d@gmail.com>
Date: Sat, 12 Oct 2024 11:53:38 +0200
From: Jonas Gorski <jonas.gorski@...il.com>
To: Mark Brown <broonie@...nel.org>, 
 Amit Kumar Mahapatra <amit.kumar-mahapatra@....com>
Cc: linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 4/6] spi: don't check spi_controller::num_chipselect when
 parsing a dt device

Do not validate spi_controller::num_chipselect against SPI_CS_CNT_MAX
when parsing an spi device firmware node.

Firstly this is the wrong place, and this should be done while
registering/validating the controller. Secondly, there is no reason for
that check, as SPI_CS_CNT_MAX controls the amount of chipselects a
device may have, not a controller may have.

So drop that check as it needlessly limits controllers to SPI_CS_CNT_MAX
number of chipselects.

Likewise, drop the check for number of device chipselects larger than
controller's number of chipselects, as __spi_add_device() will already
catch that as either one of the chip selects will be out of range, or
there is a duplicate one.

Signed-off-by: Jonas Gorski <jonas.gorski@...il.com>
---
 drivers/spi/spi.c | 11 +----------
 1 file changed, 1 insertion(+), 10 deletions(-)

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index 495b391710d69a46beaa56c1a4332eb6677d2f45..ebf8bc9c2276a6f50ba6e9fded48c870c4bd5ff0 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -2430,11 +2430,6 @@ static int of_spi_parse_dt(struct spi_controller *ctlr, struct spi_device *spi,
 		return 0;
 	}
 
-	if (ctlr->num_chipselect > SPI_CS_CNT_MAX) {
-		dev_err(&ctlr->dev, "No. of CS is more than max. no. of supported CS\n");
-		return -EINVAL;
-	}
-
 	/* Device address */
 	rc = of_property_read_variable_u32_array(nc, "reg", &cs[0], 1,
 						 SPI_CS_CNT_MAX);
@@ -2443,11 +2438,7 @@ static int of_spi_parse_dt(struct spi_controller *ctlr, struct spi_device *spi,
 			nc, rc);
 		return rc;
 	}
-	if (rc > ctlr->num_chipselect) {
-		dev_err(&ctlr->dev, "%pOF has number of CS > ctlr->num_chipselect (%d)\n",
-			nc, rc);
-		return -EINVAL;
-	}
+
 	if ((of_property_read_bool(nc, "parallel-memories")) &&
 	    (!(ctlr->flags & SPI_CONTROLLER_MULTI_CS))) {
 		dev_err(&ctlr->dev, "SPI controller doesn't support multi CS\n");

-- 
2.43.0