Commit 426ef76d authored by Geert Uytterhoeven's avatar Geert Uytterhoeven Committed by Mark Brown

spi: rspi: Add DT support

Signed-off-by: default avatarGeert Uytterhoeven <geert+renesas@linux-m68k.org>
Signed-off-by: default avatarMark Brown <broonie@linaro.org>
parent 29f397b7
Device tree configuration for Renesas RSPI/QSPI driver
Required properties:
- compatible : For Renesas Serial Peripheral Interface on legacy SH:
"renesas,rspi-<soctype>", "renesas,rspi" as fallback.
For Renesas Serial Peripheral Interface on RZ/A1H:
"renesas,rspi-<soctype>", "renesas,rspi-rz" as fallback.
For Quad Serial Peripheral Interface on R-Car Gen2:
"renesas,qspi-<soctype>", "renesas,qspi" as fallback.
Examples of valid soctypes are "sh7757" (SH),
"r7s72100" (RZ/A1H), "r8a7790" (R-Car H2), and
"r8a7791" (R-Car M2).
- reg : Address start and address range size of the device
- interrupts : A list of interrupt-specifiers, one for each entry in
interrupt-names.
If interrupt-names is not present, an interrupt specifier
for a single muxed interrupt.
- interrupt-names : A list of interrupt names. Should contain (if present):
- "error" for SPEI,
- "rx" for SPRI,
- "tx" to SPTI,
- "mux" for a single muxed interrupt.
- interrupt-parent : The phandle for the interrupt controller that
services interrupts for this device.
- num-cs : Number of chip selects. Some RSPI cores have more than 1.
- #address-cells : Must be <1>
- #size-cells : Must be <0>
Optional properties:
- clocks: : Must contain a reference to the functional clock.
Pinctrl properties might be needed, too. See
Documentation/devicetree/bindings/pinctrl/renesas,*.
Examples:
spi0: spi@e800c800 {
compatible = "renesas,rspi-r7s72100", "renesas,rspi-rz";
reg = <0xe800c800 0x24>;
interrupts = <0 238 IRQ_TYPE_LEVEL_HIGH>,
<0 239 IRQ_TYPE_LEVEL_HIGH>,
<0 240 IRQ_TYPE_LEVEL_HIGH>;
interrupt-names = "error", "rx", "tx";
interrupt-parent = <&gic>;
num-cs = <1>;
#address-cells = <1>;
#size-cells = <0>;
};
spi: spi@e6b10000 {
compatible = "renesas,qspi-r8a7791", "renesas,qspi";
reg = <0 0xe6b10000 0 0x2c>;
interrupt-parent = <&gic>;
interrupts = <0 184 IRQ_TYPE_LEVEL_HIGH>;
clocks = <&mstp9_clks R8A7791_CLK_QSPI_MOD>;
num-cs = <1>;
#address-cells = <1>;
#size-cells = <0>;
};
......@@ -31,6 +31,7 @@
#include <linux/clk.h>
#include <linux/dmaengine.h>
#include <linux/dma-mapping.h>
#include <linux/of_device.h>
#include <linux/sh_dma.h>
#include <linux/spi/spi.h>
#include <linux/spi/rspi.h>
......@@ -985,6 +986,56 @@ static int rspi_remove(struct platform_device *pdev)
return 0;
}
static const struct spi_ops rspi_ops = {
.set_config_register = rspi_set_config_register,
.transfer_one = rspi_transfer_one,
};
static const struct spi_ops rspi_rz_ops = {
.set_config_register = rspi_rz_set_config_register,
.transfer_one = rspi_rz_transfer_one,
};
static const struct spi_ops qspi_ops = {
.set_config_register = qspi_set_config_register,
.transfer_one = qspi_transfer_one,
};
#ifdef CONFIG_OF
static const struct of_device_id rspi_of_match[] = {
/* RSPI on legacy SH */
{ .compatible = "renesas,rspi", .data = &rspi_ops },
/* RSPI on RZ/A1H */
{ .compatible = "renesas,rspi-rz", .data = &rspi_rz_ops },
/* QSPI on R-Car Gen2 */
{ .compatible = "renesas,qspi", .data = &qspi_ops },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, rspi_of_match);
static int rspi_parse_dt(struct device *dev, struct spi_master *master)
{
u32 num_cs;
int error;
/* Parse DT properties */
error = of_property_read_u32(dev->of_node, "num-cs", &num_cs);
if (error) {
dev_err(dev, "of_property_read_u32 num-cs failed %d\n", error);
return error;
}
master->num_chipselect = num_cs;
return 0;
}
#else
static inline int rspi_parse_dt(struct device *dev, struct spi_master *master)
{
return -EINVAL;
}
#endif /* CONFIG_OF */
static int rspi_request_irq(struct device *dev, unsigned int irq,
irq_handler_t handler, const char *suffix,
void *dev_id)
......@@ -1004,16 +1055,9 @@ static int rspi_probe(struct platform_device *pdev)
struct spi_master *master;
struct rspi_data *rspi;
int ret;
const struct rspi_plat_data *rspi_pd = dev_get_platdata(&pdev->dev);
const struct of_device_id *of_id;
const struct rspi_plat_data *rspi_pd;
const struct spi_ops *ops;
const struct platform_device_id *id_entry = pdev->id_entry;
ops = (struct spi_ops *)id_entry->driver_data;
/* ops parameter check */
if (!ops->set_config_register) {
dev_err(&pdev->dev, "there is no set_config_register\n");
return -ENODEV;
}
master = spi_alloc_master(&pdev->dev, sizeof(struct rspi_data));
if (master == NULL) {
......@@ -1021,6 +1065,28 @@ static int rspi_probe(struct platform_device *pdev)
return -ENOMEM;
}
of_id = of_match_device(rspi_of_match, &pdev->dev);
if (of_id) {
ops = of_id->data;
ret = rspi_parse_dt(&pdev->dev, master);
if (ret)
goto error1;
} else {
ops = (struct spi_ops *)pdev->id_entry->driver_data;
rspi_pd = dev_get_platdata(&pdev->dev);
if (rspi_pd && rspi_pd->num_chipselect)
master->num_chipselect = rspi_pd->num_chipselect;
else
master->num_chipselect = 2; /* default */
};
/* ops parameter check */
if (!ops->set_config_register) {
dev_err(&pdev->dev, "there is no set_config_register\n");
ret = -ENODEV;
goto error1;
}
rspi = spi_master_get_devdata(master);
platform_set_drvdata(pdev, rspi);
rspi->ops = ops;
......@@ -1048,11 +1114,6 @@ static int rspi_probe(struct platform_device *pdev)
init_waitqueue_head(&rspi->wait);
if (rspi_pd && rspi_pd->num_chipselect)
master->num_chipselect = rspi_pd->num_chipselect;
else
master->num_chipselect = 2; /* default */
master->bus_num = pdev->id;
master->setup = rspi_setup;
master->transfer_one = ops->transfer_one;
......@@ -1060,6 +1121,7 @@ static int rspi_probe(struct platform_device *pdev)
master->prepare_message = rspi_prepare_message;
master->unprepare_message = rspi_unprepare_message;
master->mode_bits = SPI_CPHA | SPI_CPOL | SPI_LOOP;
master->dev.of_node = pdev->dev.of_node;
ret = platform_get_irq_byname(pdev, "rx");
if (ret < 0) {
......@@ -1122,21 +1184,6 @@ static int rspi_probe(struct platform_device *pdev)
return ret;
}
static struct spi_ops rspi_ops = {
.set_config_register = rspi_set_config_register,
.transfer_one = rspi_transfer_one,
};
static struct spi_ops rspi_rz_ops = {
.set_config_register = rspi_rz_set_config_register,
.transfer_one = rspi_rz_transfer_one,
};
static struct spi_ops qspi_ops = {
.set_config_register = qspi_set_config_register,
.transfer_one = qspi_transfer_one,
};
static struct platform_device_id spi_driver_ids[] = {
{ "rspi", (kernel_ulong_t)&rspi_ops },
{ "rspi-rz", (kernel_ulong_t)&rspi_rz_ops },
......@@ -1153,6 +1200,7 @@ static struct platform_driver rspi_driver = {
.driver = {
.name = "renesas_spi",
.owner = THIS_MODULE,
.of_match_table = of_match_ptr(rspi_of_match),
},
};
module_platform_driver(rspi_driver);
......
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