From: Miquel Raynal <miquel.raynal@bootlin.com>
To: Mark Brown <broonie@kernel.org>,
Michal Simek <michal.simek@xilinx.com>,
Naga Sureshkumar Relli <naga.sureshkumar.relli@xilinx.com>
Cc: Miquel Raynal <miquel.raynal@bootlin.com>,
Tudor Ambarus <Tudor.Ambarus@microchip.com>,
linux-arm-kernel@lists.infradead.org,
Thomas Petazzoni <thomas.petazzoni@bootlin.com>,
linux-spi@vger.kernel.org
Subject: [PATCH v2 1/7] spi: zynq-qspi: Anything else than CS0 is not supported yet
Date: Fri, 8 Nov 2019 15:07:38 +0100 [thread overview]
Message-ID: <20191108140744.1734-2-miquel.raynal@bootlin.com> (raw)
In-Reply-To: <20191108140744.1734-1-miquel.raynal@bootlin.com>
Unlike what the driver is currently advertizing, CS0 only can be used,
CS1 is not supported at all. Prevent people to use CS1.
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
---
drivers/spi/spi-zynq-qspi.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/drivers/spi/spi-zynq-qspi.c b/drivers/spi/spi-zynq-qspi.c
index 5cf6993ddce5..713f9a03a40a 100644
--- a/drivers/spi/spi-zynq-qspi.c
+++ b/drivers/spi/spi-zynq-qspi.c
@@ -681,10 +681,14 @@ static int zynq_qspi_probe(struct platform_device *pdev)
ret = of_property_read_u32(np, "num-cs",
&num_cs);
- if (ret < 0)
+ if (ret < 0) {
ctlr->num_chipselect = ZYNQ_QSPI_DEFAULT_NUM_CS;
- else
+ } else if (num_cs > ZYNQ_QSPI_DEFAULT_NUM_CS) {
+ dev_err(&pdev->dev, "anything but CS0 is not yet supported\n");
+ goto remove_master;
+ } else {
ctlr->num_chipselect = num_cs;
+ }
ctlr->mode_bits = SPI_RX_DUAL | SPI_RX_QUAD |
SPI_TX_DUAL | SPI_TX_QUAD;
--
2.20.1
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next prev parent reply other threads:[~2019-11-08 14:10 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-08 14:07 [PATCH v2 0/7] spi: zynq-qspi: Clarify and fix the chip selection Miquel Raynal
2019-11-08 14:07 ` Miquel Raynal [this message]
2019-11-08 17:45 ` Applied "spi: zynq-qspi: Anything else than CS0 is not supported yet" to the spi tree Mark Brown
2019-11-08 14:07 ` [PATCH v2 2/7] spi: zynq-qspi: Keep the naming consistent across the driver Miquel Raynal
2019-11-08 14:07 ` [PATCH v2 3/7] spi: zynq-qspi: Keep the bitfields naming consistent Miquel Raynal
2019-11-08 17:45 ` Applied "spi: zynq-qspi: Keep the bitfields naming consistent" to the spi tree Mark Brown
2019-11-08 14:07 ` [PATCH v2 4/7] spi: zynq-qspi: Enhance the Linear CFG bit definitions Miquel Raynal
2019-11-08 17:45 ` Applied "spi: zynq-qspi: Enhance the Linear CFG bit definitions" to the spi tree Mark Brown
2019-11-08 14:07 ` [PATCH v2 5/7] spi: zynq-qspi: Clarify the select chip function Miquel Raynal
2019-11-08 17:45 ` Applied "spi: zynq-qspi: Clarify the select chip function" to the spi tree Mark Brown
2019-11-08 14:07 ` [PATCH v2 6/7] spi: zynq-qspi: Do the actual hardware initialization later in the probe Miquel Raynal
2019-11-08 17:45 ` Applied "spi: zynq-qspi: Do the actual hardware initialization later in the probe" to the spi tree Mark Brown
2019-11-08 14:07 ` [PATCH v2 7/7] spi: zynq-qspi: Support two chip selects Miquel Raynal
2019-11-08 17:45 ` Applied "spi: zynq-qspi: Support two chip selects" to the spi tree Mark Brown
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