linux-kernel - [PATCH 2/3] spi: lpspi: add multi SS support in PIO mode

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Date:   Tue, 23 Apr 2019 10:46:22 +0000
From:   Clark Wang <xiaoning.wang@....com>
To:     "broonie@...nel.org" <broonie@...nel.org>
CC:     "linux-spi@...r.kernel.org" <linux-spi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH 2/3] spi: lpspi: add multi SS support in PIO mode

Add "fsl,spi-num-chipselects" check to support multi SS function in PIO
mode.

Signed-off-by: Clark Wang <xiaoning.wang@....com>
Acked-by: Fugang Duan <fugang.duan@....com>
---
 drivers/spi/spi-fsl-lpspi.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/drivers/spi/spi-fsl-lpspi.c b/drivers/spi/spi-fsl-lpspi.c
index 19040b5ef349..a8e83cb96f61 100644
--- a/drivers/spi/spi-fsl-lpspi.c
+++ b/drivers/spi/spi-fsl-lpspi.c
@@ -841,7 +841,7 @@ static int fsl_lpspi_probe(struct platform_device *pdev)
 	struct spi_imx_master *lpspi_platform_info =
 		dev_get_platdata(&pdev->dev);
 	struct resource *res;
-	int i, ret, irq;
+	int i, ret, irq, num_cs;
 	u32 temp;
 	bool is_slave;
 
@@ -863,6 +863,16 @@ static int fsl_lpspi_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, controller);
 
+	ret = of_property_read_u32(np, "fsl,spi-num-chipselects", &num_cs);
+	if (ret < 0) {
+		if (lpspi_platform_info) {
+			num_cs = lpspi_platform_info->num_chipselect;
+			controller->num_chipselect = num_cs;
+		}
+	} else {
+		controller->num_chipselect = num_cs;
+	}
+
 	fsl_lpspi = spi_controller_get_devdata(controller);
 	fsl_lpspi->dev = &pdev->dev;
 	fsl_lpspi->is_slave = is_slave;
-- 
2.17.1