openwrt/target/linux/pistachio/patches-4.9/104-spi-img-spfi-use-device-0-configuration-for-all-devi.patch

From 905ee06a9966113fe51d6bad1819759cb30fd0bd Mon Sep 17 00:00:00 2001
From: Ionela Voinescu <ionela.voinescu@imgtec.com>
Date: Tue, 9 Feb 2016 10:18:31 +0000
Subject: spi: img-spfi: use device 0 configuration for all devices

Given that we control the chip select line externally
we can use only one parameter register (device 0 parameter
register) and one set of configuration bits (port configuration
bits for device 0) for all devices (all chip select lines).

Signed-off-by: Ionela Voinescu <ionela.voinescu@imgtec.com>
---
 drivers/spi/spi-img-spfi.c | 23 ++++++++++++++++-------
 1 file changed, 16 insertions(+), 7 deletions(-)

--- a/drivers/spi/spi-img-spfi.c
+++ b/drivers/spi/spi-img-spfi.c
@@ -437,18 +437,23 @@ static int img_spfi_prepare(struct spi_m
 	struct img_spfi *spfi = spi_master_get_devdata(master);
 	u32 val;
 
+	/*
+	 * The chip select line is controlled externally so
+	 * we can use the CS0 configuration for all devices
+	 */
 	val = spfi_readl(spfi, SPFI_PORT_STATE);
+
+	/* 0 for device selection */
 	val &= ~(SPFI_PORT_STATE_DEV_SEL_MASK <<
 		 SPFI_PORT_STATE_DEV_SEL_SHIFT);
-	val |= msg->spi->chip_select << SPFI_PORT_STATE_DEV_SEL_SHIFT;
 	if (msg->spi->mode & SPI_CPHA)
-		val |= SPFI_PORT_STATE_CK_PHASE(msg->spi->chip_select);
+		val |= SPFI_PORT_STATE_CK_PHASE(0);
 	else
-		val &= ~SPFI_PORT_STATE_CK_PHASE(msg->spi->chip_select);
+		val &= ~SPFI_PORT_STATE_CK_PHASE(0);
 	if (msg->spi->mode & SPI_CPOL)
-		val |= SPFI_PORT_STATE_CK_POL(msg->spi->chip_select);
+		val |= SPFI_PORT_STATE_CK_POL(0);
 	else
-		val &= ~SPFI_PORT_STATE_CK_POL(msg->spi->chip_select);
+		val &= ~SPFI_PORT_STATE_CK_POL(0);
 	spfi_writel(spfi, val, SPFI_PORT_STATE);
 
 	return 0;
@@ -548,11 +553,15 @@ static void img_spfi_config(struct spi_m
 	div = DIV_ROUND_UP(clk_get_rate(spfi->spfi_clk), xfer->speed_hz);
 	div = clamp(512 / (1 << get_count_order(div)), 1, 128);
 
-	val = spfi_readl(spfi, SPFI_DEVICE_PARAMETER(spi->chip_select));
+	/*
+	 * The chip select line is controlled externally so
+	 * we can use the CS0 parameters for all devices
+	 */
+	val = spfi_readl(spfi, SPFI_DEVICE_PARAMETER(0));
 	val &= ~(SPFI_DEVICE_PARAMETER_BITCLK_MASK <<
 		 SPFI_DEVICE_PARAMETER_BITCLK_SHIFT);
 	val |= div << SPFI_DEVICE_PARAMETER_BITCLK_SHIFT;
-	spfi_writel(spfi, val, SPFI_DEVICE_PARAMETER(spi->chip_select));
+	spfi_writel(spfi, val, SPFI_DEVICE_PARAMETER(0));
 
 	if (!list_is_last(&xfer->transfer_list, &master->cur_msg->transfers) &&
 		/*