openwrt/target/linux/ipq806x/patches-4.9/0068-spi-add-gpio-cs-support.patch

From b9c998eb7735df8000cf48d77f9271823e8e73da Mon Sep 17 00:00:00 2001
From: Ram Chandra Jangir <rjangi@codeaurora.org>
Date: Thu, 9 Mar 2017 09:39:05 +0100
Subject: [PATCH 68/69] spi: add gpio cs support

Signed-off-by: John Crispin <john@phrozen.org>
---
 drivers/spi/spi-qup.c | 38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)

--- a/drivers/spi/spi-qup.c
+++ b/drivers/spi/spi-qup.c
@@ -24,6 +24,7 @@
 #include <linux/spi/spi.h>
 #include <linux/dmaengine.h>
 #include <linux/dma-mapping.h>
+#include <linux/gpio.h>
 
 #define QUP_CONFIG			0x0000
 #define QUP_STATE			0x0004
@@ -1019,6 +1020,38 @@ err_tx:
 	return ret;
 }
 
+static void spi_qup_set_cs(struct spi_device *spi, bool val)
+{
+	struct spi_qup *controller;
+	u32 spi_ioc;
+	u32 spi_ioc_orig;
+
+	controller = spi_master_get_devdata(spi->master);
+	spi_ioc = readl_relaxed(controller->base + SPI_IO_CONTROL);
+	spi_ioc_orig = spi_ioc;
+	if (!val)
+		spi_ioc |= SPI_IO_C_FORCE_CS;
+	else
+		spi_ioc &= ~SPI_IO_C_FORCE_CS;
+
+	if (spi_ioc != spi_ioc_orig)
+		writel_relaxed(spi_ioc, controller->base + SPI_IO_CONTROL);
+}
+
+static int spi_qup_setup(struct spi_device *spi)
+{
+	if (spi->cs_gpio >= 0) {
+		if (spi->mode & SPI_CS_HIGH)
+			gpio_set_value(spi->cs_gpio, 0);
+		else
+			gpio_set_value(spi->cs_gpio, 1);
+
+		udelay(10);
+	}
+
+	return 0;
+}
+
 static int spi_qup_probe(struct platform_device *pdev)
 {
 	struct spi_master *master;
@@ -1115,6 +1148,11 @@ static int spi_qup_probe(struct platform
 	if (of_device_is_compatible(dev->of_node, "qcom,spi-qup-v1.1.1"))
 		controller->qup_v1 = 1;
 
+	if (!controller->qup_v1)
+		master->set_cs = spi_qup_set_cs;
+	else
+		master->setup = spi_qup_setup;
+
 	spin_lock_init(&controller->lock);
 	init_completion(&controller->done);
 	init_completion(&controller->dma_tx_done);