diff options
Diffstat (limited to 'target/linux/ar71xx/patches-4.1/451-gpio-74x164-improve-platform-device-support.patch')
| -rw-r--r-- | target/linux/ar71xx/patches-4.1/451-gpio-74x164-improve-platform-device-support.patch | 111 |
1 files changed, 111 insertions, 0 deletions
diff --git a/target/linux/ar71xx/patches-4.1/451-gpio-74x164-improve-platform-device-support.patch b/target/linux/ar71xx/patches-4.1/451-gpio-74x164-improve-platform-device-support.patch new file mode 100644 index 0000000..95e5b5a --- /dev/null +++ b/target/linux/ar71xx/patches-4.1/451-gpio-74x164-improve-platform-device-support.patch @@ -0,0 +1,111 @@ +--- 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; +@@ -174,17 +195,19 @@ 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 /* CONFIG_OF */ + + static struct spi_driver gen_74x164_driver = { + .driver = { + .name = "74x164", + .owner = THIS_MODULE, +- .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 +@@ -941,7 +941,7 @@ menu "SPI GPIO expanders" + + config GPIO_74X164 + tristate "74x164 serial-in/parallel-out 8-bits shift register" +- depends on SPI_MASTER && OF ++ depends on SPI_MASTER + help + Driver for 74x164 compatible serial-in/parallel-out 8-outputs + shift registers. This driver can be used to provide access |