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- --- 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
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