110 lines
3.0 KiB
Diff
110 lines
3.0 KiB
Diff
--- a/drivers/gpio/gpio-74x164.c
|
|
+++ b/drivers/gpio/gpio-74x164.c
|
|
@@ -12,6 +12,7 @@
|
|
#include <linux/init.h>
|
|
#include <linux/mutex.h>
|
|
#include <linux/spi/spi.h>
|
|
+#include <linux/spi/74x164.h>
|
|
#include <linux/gpio.h>
|
|
#include <linux/of_gpio.h>
|
|
#include <linux/slab.h>
|
|
@@ -107,8 +108,18 @@ static int gen_74x164_direction_output(s
|
|
static int gen_74x164_probe(struct spi_device *spi)
|
|
{
|
|
struct gen_74x164_chip *chip;
|
|
+ struct gen_74x164_chip_platform_data *pdata;
|
|
+ struct device_node *np;
|
|
int ret;
|
|
|
|
+ pdata = spi->dev.platform_data;
|
|
+ np = spi->dev.of_node;
|
|
+
|
|
+ if (!np && !pdata) {
|
|
+ dev_err(&spi->dev, "No configuration data available.\n");
|
|
+ return -EINVAL;
|
|
+ }
|
|
+
|
|
/*
|
|
* bits_per_word cannot be configured in platform data
|
|
*/
|
|
@@ -130,18 +141,28 @@ static int gen_74x164_probe(struct spi_d
|
|
chip->gpio_chip.set = gen_74x164_set_value;
|
|
chip->gpio_chip.base = -1;
|
|
|
|
- if (of_property_read_u32(spi->dev.of_node, "registers-number",
|
|
- &chip->registers)) {
|
|
- dev_err(&spi->dev,
|
|
- "Missing registers-number property in the DT.\n");
|
|
- return -EINVAL;
|
|
+ if (np) {
|
|
+ if (of_property_read_u32(spi->dev.of_node, "registers-number", &chip->registers)) {
|
|
+ dev_err(&spi->dev, "Missing registers-number property in the DT.\n");
|
|
+ ret = -EINVAL;
|
|
+ goto exit_destroy;
|
|
+ }
|
|
+ } else if (pdata) {
|
|
+ chip->gpio_chip.base = pdata->base;
|
|
+ chip->registers = pdata->num_registers;
|
|
}
|
|
|
|
+ if (!chip->registers)
|
|
+ chip->registers = 1;
|
|
+
|
|
chip->gpio_chip.ngpio = GEN_74X164_NUMBER_GPIOS * chip->registers;
|
|
chip->buffer = devm_kzalloc(&spi->dev, chip->registers, GFP_KERNEL);
|
|
if (!chip->buffer)
|
|
return -ENOMEM;
|
|
|
|
+ if (pdata && pdata->init_data)
|
|
+ memcpy(chip->buffer, pdata->init_data, chip->registers);
|
|
+
|
|
chip->gpio_chip.can_sleep = true;
|
|
chip->gpio_chip.dev = &spi->dev;
|
|
chip->gpio_chip.owner = THIS_MODULE;
|
|
@@ -174,16 +195,18 @@ static int gen_74x164_remove(struct spi_
|
|
return 0;
|
|
}
|
|
|
|
+#ifdef CONFIG_OF
|
|
static const struct of_device_id gen_74x164_dt_ids[] = {
|
|
{ .compatible = "fairchild,74hc595" },
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(of, gen_74x164_dt_ids);
|
|
+#endif
|
|
|
|
static struct spi_driver gen_74x164_driver = {
|
|
.driver = {
|
|
.name = "74x164",
|
|
- .of_match_table = gen_74x164_dt_ids,
|
|
+ .of_match_table = of_match_ptr(gen_74x164_dt_ids),
|
|
},
|
|
.probe = gen_74x164_probe,
|
|
.remove = gen_74x164_remove,
|
|
--- /dev/null
|
|
+++ b/include/linux/spi/74x164.h
|
|
@@ -0,0 +1,13 @@
|
|
+#ifndef LINUX_SPI_74X164_H
|
|
+#define LINUX_SPI_74X164_H
|
|
+
|
|
+struct gen_74x164_chip_platform_data {
|
|
+ /* number assigned to the first GPIO */
|
|
+ unsigned base;
|
|
+ /* number of chained registers */
|
|
+ unsigned num_registers;
|
|
+ /* address of a buffer containing initial data */
|
|
+ u8 *init_data;
|
|
+};
|
|
+
|
|
+#endif
|
|
--- a/drivers/gpio/Kconfig
|
|
+++ b/drivers/gpio/Kconfig
|
|
@@ -992,7 +992,6 @@ menu "SPI GPIO expanders"
|
|
|
|
config GPIO_74X164
|
|
tristate "74x164 serial-in/parallel-out 8-bits shift register"
|
|
- depends on OF
|
|
help
|
|
Driver for 74x164 compatible serial-in/parallel-out 8-outputs
|
|
shift registers. This driver can be used to provide access
|