[6/7] spi: zynq-qspi: Do the actual hardware initialization later in the probe
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Message ID 20191108105920.19014-7-miquel.raynal@bootlin.com
State Superseded
Headers show
Series
  • spi: zynq-qspi: Clarify and fix the chip selection
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Commit Message

Miquel Raynal Nov. 8, 2019, 10:59 a.m. UTC
Supporting more than one CS will need some tweaking of the linear
configuration register which is (rightfully) initialized in the
hardware initialization helper. The extra initialization needs the
knowledge of the actual number of CS, which is retrieved by reading
the value of the num-cs DT property.

As the initialization helper is called pretty early and might be
called much later in the probe without side effect, let's delay it a
bit so that the number of CS will be available when running this
helper. This way, adding support for multiple CS lines in a next patch
will be eased.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
---
 drivers/spi/spi-zynq-qspi.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

Patch
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diff --git a/drivers/spi/spi-zynq-qspi.c b/drivers/spi/spi-zynq-qspi.c
index 1ea9a4c2eceb..68e0515e1791 100644
--- a/drivers/spi/spi-zynq-qspi.c
+++ b/drivers/spi/spi-zynq-qspi.c
@@ -680,9 +680,6 @@  static int zynq_qspi_probe(struct platform_device *pdev)
 		goto clk_dis_pclk;
 	}
 
-	/* QSPI controller initializations */
-	zynq_qspi_init_hw(xqspi);
-
 	xqspi->irq = platform_get_irq(pdev, 0);
 	if (xqspi->irq <= 0) {
 		ret = -ENXIO;
@@ -714,6 +711,10 @@  static int zynq_qspi_probe(struct platform_device *pdev)
 	ctlr->setup = zynq_qspi_setup_op;
 	ctlr->max_speed_hz = clk_get_rate(xqspi->refclk) / 2;
 	ctlr->dev.of_node = np;
+
+	/* QSPI controller initializations */
+	zynq_qspi_init_hw(xqspi);
+
 	ret = spi_register_controller(ctlr);
 	if (ret) {
 		dev_err(&pdev->dev, "spi_register_master failed\n");