diff --git a/Documentation/devicetree/bindings/spi/spi-davinci.txt b/Documentation/devicetree/bindings/spi/spi-davinci.txt
index 12ecfe9e359956566b95ede24005d2a18844c52c..d1e914adcf6e104856aae9ac023fc57a21292c5b 100644
--- a/Documentation/devicetree/bindings/spi/spi-davinci.txt
+++ b/Documentation/devicetree/bindings/spi/spi-davinci.txt
@@ -12,6 +12,8 @@ Required properties:
- compatible:
- "ti,dm6441-spi" for SPI used similar to that on DM644x SoC family
- "ti,da830-spi" for SPI used similar to that on DA8xx SoC family
+ - "ti,keystone-spi" for SPI used similar to that on Keystone2 SoC
+ family
- reg: Offset and length of SPI controller register space
- num-cs: Number of chip selects. This includes internal as well as
GPIO chip selects.
diff --git a/arch/arm/mach-davinci/devices-da8xx.c b/arch/arm/mach-davinci/devices-da8xx.c
index ddfdd820e6f2b99f6bfa80a51a287255794d74d5..29e08aac8294aa06233b916c130aa0740a6d897f 100644
--- a/arch/arm/mach-davinci/devices-da8xx.c
+++ b/arch/arm/mach-davinci/devices-da8xx.c
@@ -1010,11 +1010,13 @@ static struct davinci_spi_platform_data da8xx_spi_pdata[] = {
.version = SPI_VERSION_2,
.intr_line = 1,
.dma_event_q = EVENTQ_0,
+ .prescaler_limit = 2,
},
[1] = {
.version = SPI_VERSION_2,
.intr_line = 1,
.dma_event_q = EVENTQ_0,
+ .prescaler_limit = 2,
},
};
diff --git a/arch/arm/mach-davinci/dm355.c b/arch/arm/mach-davinci/dm355.c
index 9cbeda798584d236bfbc9db0f6b4abbc2d420b90..567dc56fe8cded405dc05dffb01605cc0316d9dd 100644
--- a/arch/arm/mach-davinci/dm355.c
+++ b/arch/arm/mach-davinci/dm355.c
@@ -411,6 +411,7 @@ static struct davinci_spi_platform_data dm355_spi0_pdata = {
.num_chipselect = 2,
.cshold_bug = true,
.dma_event_q = EVENTQ_1,
+ .prescaler_limit = 1,
};
static struct platform_device dm355_spi0_device = {
.name = "spi_davinci",
diff --git a/arch/arm/mach-davinci/dm365.c b/arch/arm/mach-davinci/dm365.c
index e3a3c54b6832e4bf35410564411e5235cb54c566..6a890a8486d0032462490144065e8c6e140b8833 100644
--- a/arch/arm/mach-davinci/dm365.c
+++ b/arch/arm/mach-davinci/dm365.c
@@ -646,6 +646,7 @@ static struct davinci_spi_platform_data dm365_spi0_pdata = {
.version = SPI_VERSION_1,
.num_chipselect = 2,
.dma_event_q = EVENTQ_3,
+ .prescaler_limit = 1,
};
static struct resource dm365_spi0_resources[] = {
diff --git a/drivers/spi/spi-atmel.c b/drivers/spi/spi-atmel.c
index c9eca347787db7ba5f85f6b1c4e10ad66e856abb..bf9ed380bb1c0754addbd27aedf7d874cee89ff2 100644
--- a/drivers/spi/spi-atmel.c
+++ b/drivers/spi/spi-atmel.c
@@ -19,7 +19,6 @@
#include <linux/interrupt.h>
#include <linux/spi/spi.h>
#include <linux/slab.h>
-#include <linux/platform_data/atmel.h>
#include <linux/platform_data/dma-atmel.h>
#include <linux/of.h>
diff --git a/drivers/spi/spi-bcm63xx-hsspi.c b/drivers/spi/spi-bcm63xx-hsspi.c
index f5ca6dc3a157879895aa0953c4c6681594b3d5ff..55789f7cda9280b2f0d21b65b6a7f3c019780047 100644
--- a/drivers/spi/spi-bcm63xx-hsspi.c
+++ b/drivers/spi/spi-bcm63xx-hsspi.c
@@ -76,6 +76,7 @@
#define HSSPI_FIFO_REG(x) (0x200 + (x) * 0x200)
+#define HSSPI_OP_MULTIBIT BIT(11)
#define HSSPI_OP_CODE_SHIFT 13
#define HSSPI_OP_SLEEP (0 << HSSPI_OP_CODE_SHIFT)
#define HSSPI_OP_READ_WRITE (1 << HSSPI_OP_CODE_SHIFT)
@@ -171,9 +172,12 @@ static int bcm63xx_hsspi_do_txrx(struct spi_device *spi, struct spi_transfer *t)
if (opcode != HSSPI_OP_READ)
step_size -= HSSPI_OPCODE_LEN;
- __raw_writel(0 << MODE_CTRL_PREPENDBYTE_CNT_SHIFT |
- 2 << MODE_CTRL_MULTIDATA_WR_STRT_SHIFT |
- 2 << MODE_CTRL_MULTIDATA_RD_STRT_SHIFT | 0xff,
+ if ((opcode == HSSPI_OP_READ && t->rx_nbits == SPI_NBITS_DUAL) ||
+ (opcode == HSSPI_OP_WRITE && t->tx_nbits == SPI_NBITS_DUAL))
+ opcode |= HSSPI_OP_MULTIBIT;
+
+ __raw_writel(1 << MODE_CTRL_MULTIDATA_WR_SIZE_SHIFT |
+ 1 << MODE_CTRL_MULTIDATA_RD_SIZE_SHIFT | 0xff,
bs->regs + HSSPI_PROFILE_MODE_CTRL_REG(chip_select));
while (pending > 0) {
@@ -374,7 +378,8 @@ static int bcm63xx_hsspi_probe(struct platform_device *pdev)
master->num_chipselect = 8;
master->setup = bcm63xx_hsspi_setup;
master->transfer_one_message = bcm63xx_hsspi_transfer_one;
- master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;
+ master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH |
+ SPI_RX_DUAL | SPI_TX_DUAL;
master->bits_per_word_mask = SPI_BPW_MASK(8);
master->auto_runtime_pm = true;
diff --git a/drivers/spi/spi-davinci.c b/drivers/spi/spi-davinci.c
index 987afebea09379507f2c8505e7f4c14acbde079c..3cf9faa6cc3fe871174ec1b2777472b0ac4c6883 100644
--- a/drivers/spi/spi-davinci.c
+++ b/drivers/spi/spi-davinci.c
@@ -139,6 +139,8 @@ struct davinci_spi {
u32 (*get_tx)(struct davinci_spi *);
u8 *bytes_per_word;
+
+ u8 prescaler_limit;
};
static struct davinci_spi_config davinci_spi_default_cfg;
@@ -255,7 +257,7 @@ static void davinci_spi_chipselect(struct spi_device *spi, int value)
* This function calculates the prescale value that generates a clock rate
* less than or equal to the specified maximum.
*
- * Returns: calculated prescale - 1 for easy programming into SPI registers
+ * Returns: calculated prescale value for easy programming into SPI registers
* or negative error number if valid prescalar cannot be updated.
*/
static inline int davinci_spi_get_prescale(struct davinci_spi *dspi,
@@ -263,12 +265,13 @@ static inline int davinci_spi_get_prescale(struct davinci_spi *dspi,
{
int ret;
- ret = DIV_ROUND_UP(clk_get_rate(dspi->clk), max_speed_hz);
+ /* Subtract 1 to match what will be programmed into SPI register. */
+ ret = DIV_ROUND_UP(clk_get_rate(dspi->clk), max_speed_hz) - 1;
- if (ret < 1 || ret > 256)
+ if (ret < dspi->prescaler_limit || ret > 255)
return -EINVAL;
- return ret - 1;
+ return ret;
}
/**
@@ -832,13 +835,40 @@ static int davinci_spi_request_dma(struct davinci_spi *dspi)
}
#if defined(CONFIG_OF)
+
+/* OF SPI data structure */
+struct davinci_spi_of_data {
+ u8 version;
+ u8 prescaler_limit;
+};
+
+static const struct davinci_spi_of_data dm6441_spi_data = {
+ .version = SPI_VERSION_1,
+ .prescaler_limit = 2,
+};
+
+static const struct davinci_spi_of_data da830_spi_data = {
+ .version = SPI_VERSION_2,
+ .prescaler_limit = 2,
+};
+
+static const struct davinci_spi_of_data keystone_spi_data = {
+ .version = SPI_VERSION_1,
+ .prescaler_limit = 0,
+};
+
static const struct of_device_id davinci_spi_of_match[] = {
{
.compatible = "ti,dm6441-spi",
+ .data = &dm6441_spi_data,
},
{
.compatible = "ti,da830-spi",
- .data = (void *)SPI_VERSION_2,
+ .data = &da830_spi_data,
+ },
+ {
+ .compatible = "ti,keystone-spi",
+ .data = &keystone_spi_data,
},
{ },
};
@@ -857,21 +887,21 @@ static int spi_davinci_get_pdata(struct platform_device *pdev,
struct davinci_spi *dspi)
{
struct device_node *node = pdev->dev.of_node;
+ struct davinci_spi_of_data *spi_data;
struct davinci_spi_platform_data *pdata;
unsigned int num_cs, intr_line = 0;
const struct of_device_id *match;
pdata = &dspi->pdata;
- pdata->version = SPI_VERSION_1;
match = of_match_device(davinci_spi_of_match, &pdev->dev);
if (!match)
return -ENODEV;
- /* match data has the SPI version number for SPI_VERSION_2 */
- if (match->data == (void *)SPI_VERSION_2)
- pdata->version = SPI_VERSION_2;
+ spi_data = (struct davinci_spi_of_data *)match->data;
+ pdata->version = spi_data->version;
+ pdata->prescaler_limit = spi_data->prescaler_limit;
/*
* default num_cs is 1 and all chipsel are internal to the chip
* indicated by chip_sel being NULL or cs_gpios being NULL or
@@ -991,7 +1021,7 @@ static int davinci_spi_probe(struct platform_device *pdev)
dspi->bitbang.chipselect = davinci_spi_chipselect;
dspi->bitbang.setup_transfer = davinci_spi_setup_transfer;
-
+ dspi->prescaler_limit = pdata->prescaler_limit;
dspi->version = pdata->version;
dspi->bitbang.flags = SPI_NO_CS | SPI_LSB_FIRST | SPI_LOOP;
diff --git a/include/linux/platform_data/spi-davinci.h b/include/linux/platform_data/spi-davinci.h
index 8dc2fa47a2aa3c095f66f234d2975c5e18e10f53..f4edcb03c40c9f22bbefc708c831c922cfc9fe4f 100644
--- a/include/linux/platform_data/spi-davinci.h
+++ b/include/linux/platform_data/spi-davinci.h
@@ -49,6 +49,7 @@ struct davinci_spi_platform_data {
u8 num_chipselect;
u8 intr_line;
u8 *chip_sel;
+ u8 prescaler_limit;
bool cshold_bug;
enum dma_event_q dma_event_q;
};