From 7034ee641a5e1b376a97632445888581fc3ac197 Mon Sep 17 00:00:00 2001
From: Clark Wang <xiaoning.wang@nxp.com>
Date: Thu, 3 Jan 2019 17:54:11 +0800
Subject: [PATCH] MLK-20060-6 dts: lpspi: Prevent CS line error in slave mode

Prevent cs line configuration error in slave mode.

If master mode uses cs-gpio configuration, it should be changed into
non-gpio for CS line in slave mode. Otherwise, slave will receive several
0xFF at the beginning of one transfer especially in dma mode.

Signed-off-by: Clark Wang <xiaoning.wang@nxp.com>
Acked-by: Fugang Duan <Fugang.duan@nxp.com>
Signed-off-by: Arulpandiyan Vadivel <arulpandiyan_vadivel@mentor.com>
Signed-off-by: Shrikant Bobade <Shrikant_Bobade@mentor.com>
(cherry picked from commit 88ba1025094d53fdecd1b443ef1a85514a132f21)
---
 arch/arm/boot/dts/imx7ulp-evkb-spi-slave.dts | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/arch/arm/boot/dts/imx7ulp-evkb-spi-slave.dts b/arch/arm/boot/dts/imx7ulp-evkb-spi-slave.dts
index 9a5f3e2dfd04..3e38544add00 100644
--- a/arch/arm/boot/dts/imx7ulp-evkb-spi-slave.dts
+++ b/arch/arm/boot/dts/imx7ulp-evkb-spi-slave.dts
@@ -11,6 +11,18 @@
 
 /delete-node/&spidev0;
 
+&pinctrl_lpspi3 {
+	fsl,pins = <
+		IMX7ULP_PAD_PTF16__LPSPI3_SIN	0x0
+		IMX7ULP_PAD_PTF17__LPSPI3_SOUT	0x0
+		IMX7ULP_PAD_PTF18__LPSPI3_SCK	0x0
+		IMX7ULP_PAD_PTF19__LPSPI3_PCS0	0x0
+	>;
+};
+
 &lpspi3 {
+	pinctrl-0 = <&pinctrl_lpspi3>;
+	pinctrl-1 = <&pinctrl_lpspi3>;
+	/delete-property/ cs-gpios;
 	spi-slave;
 };
-- 
2.17.1