Commit 6d3952a7 authored by Roland Stigge's avatar Roland Stigge Committed by Mark Brown

spi/pl022: Add devicetree support

This patch adds device tree support to the spi-pl022 driver.

Based on the initial patch by Alexandre Pereira da Silva <aletes.xgr@gmail.com>
Signed-off-by: default avatarRoland Stigge <stigge@antcom.de>
Acked-by: default avatarAlexandre Pereira da Silva <aletes.xgr@gmail.com>
Reviewed-by: default avatarLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
parent f6f46de1
...@@ -6,7 +6,22 @@ Required properties: ...@@ -6,7 +6,22 @@ Required properties:
- interrupts : Should contain SPI controller interrupt - interrupts : Should contain SPI controller interrupt
Optional properties: Optional properties:
- num-cs : total number of chipselects
- cs-gpios : should specify GPIOs used for chipselects. - cs-gpios : should specify GPIOs used for chipselects.
The gpios will be referred to as reg = <index> in the SPI child nodes. The gpios will be referred to as reg = <index> in the SPI child nodes.
If unspecified, a single SPI device without a chip select can be used. If unspecified, a single SPI device without a chip select can be used.
SPI slave nodes must be children of the SPI master node and can
contain the following properties.
- pl022,interface : interface type:
0: SPI
1: Texas Instruments Synchronous Serial Frame Format
2: Microwire (Half Duplex)
- pl022,com-mode : polling, interrupt or dma
- pl022,rx-level-trig : Rx FIFO watermark level
- pl022,tx-level-trig : Tx FIFO watermark level
- pl022,ctrl-len : Microwire interface: Control length
- pl022,wait-state : Microwire interface: Wait state
- pl022,duplex : Microwire interface: Full/Half duplex
...@@ -41,6 +41,7 @@ ...@@ -41,6 +41,7 @@
#include <linux/scatterlist.h> #include <linux/scatterlist.h>
#include <linux/pm_runtime.h> #include <linux/pm_runtime.h>
#include <linux/gpio.h> #include <linux/gpio.h>
#include <linux/of_gpio.h>
/* /*
* This macro is used to define some register default values. * This macro is used to define some register default values.
...@@ -1778,12 +1779,14 @@ static const struct pl022_config_chip pl022_default_chip_info = { ...@@ -1778,12 +1779,14 @@ static const struct pl022_config_chip pl022_default_chip_info = {
static int pl022_setup(struct spi_device *spi) static int pl022_setup(struct spi_device *spi)
{ {
struct pl022_config_chip const *chip_info; struct pl022_config_chip const *chip_info;
struct pl022_config_chip chip_info_dt;
struct chip_data *chip; struct chip_data *chip;
struct ssp_clock_params clk_freq = { .cpsdvsr = 0, .scr = 0}; struct ssp_clock_params clk_freq = { .cpsdvsr = 0, .scr = 0};
int status = 0; int status = 0;
struct pl022 *pl022 = spi_master_get_devdata(spi->master); struct pl022 *pl022 = spi_master_get_devdata(spi->master);
unsigned int bits = spi->bits_per_word; unsigned int bits = spi->bits_per_word;
u32 tmp; u32 tmp;
struct device_node *np = spi->dev.of_node;
if (!spi->max_speed_hz) if (!spi->max_speed_hz)
return -EINVAL; return -EINVAL;
...@@ -1806,10 +1809,32 @@ static int pl022_setup(struct spi_device *spi) ...@@ -1806,10 +1809,32 @@ static int pl022_setup(struct spi_device *spi)
chip_info = spi->controller_data; chip_info = spi->controller_data;
if (chip_info == NULL) { if (chip_info == NULL) {
chip_info = &pl022_default_chip_info; if (np) {
/* spi_board_info.controller_data not is supplied */ chip_info_dt = pl022_default_chip_info;
dev_dbg(&spi->dev,
"using default controller_data settings\n"); chip_info_dt.hierarchy = SSP_MASTER;
of_property_read_u32(np, "pl022,interface",
&chip_info_dt.iface);
of_property_read_u32(np, "pl022,com-mode",
&chip_info_dt.com_mode);
of_property_read_u32(np, "pl022,rx-level-trig",
&chip_info_dt.rx_lev_trig);
of_property_read_u32(np, "pl022,tx-level-trig",
&chip_info_dt.tx_lev_trig);
of_property_read_u32(np, "pl022,ctrl-len",
&chip_info_dt.ctrl_len);
of_property_read_u32(np, "pl022,wait-state",
&chip_info_dt.wait_state);
of_property_read_u32(np, "pl022,duplex",
&chip_info_dt.duplex);
chip_info = &chip_info_dt;
} else {
chip_info = &pl022_default_chip_info;
/* spi_board_info.controller_data not is supplied */
dev_dbg(&spi->dev,
"using default controller_data settings\n");
}
} else } else
dev_dbg(&spi->dev, dev_dbg(&spi->dev,
"using user supplied controller_data settings\n"); "using user supplied controller_data settings\n");
...@@ -2006,7 +2031,8 @@ pl022_probe(struct amba_device *adev, const struct amba_id *id) ...@@ -2006,7 +2031,8 @@ pl022_probe(struct amba_device *adev, const struct amba_id *id)
struct pl022_ssp_controller *platform_info = adev->dev.platform_data; struct pl022_ssp_controller *platform_info = adev->dev.platform_data;
struct spi_master *master; struct spi_master *master;
struct pl022 *pl022 = NULL; /*Data for this driver */ struct pl022 *pl022 = NULL; /*Data for this driver */
int status = 0, i; struct device_node *np = adev->dev.of_node;
int status = 0, i, num_cs;
dev_info(&adev->dev, dev_info(&adev->dev,
"ARM PL022 driver, device ID: 0x%08x\n", adev->periphid); "ARM PL022 driver, device ID: 0x%08x\n", adev->periphid);
...@@ -2016,9 +2042,19 @@ pl022_probe(struct amba_device *adev, const struct amba_id *id) ...@@ -2016,9 +2042,19 @@ pl022_probe(struct amba_device *adev, const struct amba_id *id)
goto err_no_pdata; goto err_no_pdata;
} }
if (platform_info->num_chipselect) {
num_cs = platform_info->num_chipselect;
} else if (IS_ENABLED(CONFIG_OF)) {
of_property_read_u32(np, "num-cs", &num_cs);
} else {
dev_err(&adev->dev, "probe: no chip select defined\n");
status = -ENODEV;
goto err_no_pdata;
}
/* Allocate master with space for data */ /* Allocate master with space for data */
master = spi_alloc_master(dev, sizeof(struct pl022) + sizeof(int) * master = spi_alloc_master(dev, sizeof(struct pl022) + sizeof(int) *
platform_info->num_chipselect); num_cs);
if (master == NULL) { if (master == NULL) {
dev_err(&adev->dev, "probe - cannot alloc SPI master\n"); dev_err(&adev->dev, "probe - cannot alloc SPI master\n");
status = -ENOMEM; status = -ENOMEM;
...@@ -2038,17 +2074,41 @@ pl022_probe(struct amba_device *adev, const struct amba_id *id) ...@@ -2038,17 +2074,41 @@ pl022_probe(struct amba_device *adev, const struct amba_id *id)
* on this board * on this board
*/ */
master->bus_num = platform_info->bus_id; master->bus_num = platform_info->bus_id;
master->num_chipselect = platform_info->num_chipselect; master->num_chipselect = num_cs;
master->cleanup = pl022_cleanup; master->cleanup = pl022_cleanup;
master->setup = pl022_setup; master->setup = pl022_setup;
master->prepare_transfer_hardware = pl022_prepare_transfer_hardware; master->prepare_transfer_hardware = pl022_prepare_transfer_hardware;
master->transfer_one_message = pl022_transfer_one_message; master->transfer_one_message = pl022_transfer_one_message;
master->unprepare_transfer_hardware = pl022_unprepare_transfer_hardware; master->unprepare_transfer_hardware = pl022_unprepare_transfer_hardware;
master->rt = platform_info->rt; master->rt = platform_info->rt;
master->dev.of_node = dev->of_node;
if (platform_info->num_chipselect && platform_info->chipselects) if (platform_info->num_chipselect && platform_info->chipselects) {
for (i = 0; i < platform_info->num_chipselect; i++) for (i = 0; i < num_cs; i++)
pl022->chipselects[i] = platform_info->chipselects[i]; pl022->chipselects[i] = platform_info->chipselects[i];
} else if (IS_ENABLED(CONFIG_OF)) {
for (i = 0; i < num_cs; i++) {
int cs_gpio = of_get_named_gpio(np, "cs-gpios", i);
if (cs_gpio == -EPROBE_DEFER) {
status = -EPROBE_DEFER;
goto err_no_gpio;
}
pl022->chipselects[i] = cs_gpio;
if (gpio_is_valid(cs_gpio)) {
if (gpio_request(cs_gpio, "ssp-pl022"))
dev_err(&adev->dev,
"could not request %d gpio\n",
cs_gpio);
else if (gpio_direction_output(cs_gpio, 1))
dev_err(&adev->dev,
"could set gpio %d as output\n",
cs_gpio);
}
}
}
/* /*
* Supports mode 0-3, loopback, and active low CS. Transfers are * Supports mode 0-3, loopback, and active low CS. Transfers are
...@@ -2158,6 +2218,7 @@ pl022_probe(struct amba_device *adev, const struct amba_id *id) ...@@ -2158,6 +2218,7 @@ pl022_probe(struct amba_device *adev, const struct amba_id *id)
err_no_ioremap: err_no_ioremap:
amba_release_regions(adev); amba_release_regions(adev);
err_no_ioregion: err_no_ioregion:
err_no_gpio:
spi_master_put(master); spi_master_put(master);
err_no_master: err_no_master:
err_no_pdata: err_no_pdata:
......
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