diff options
Diffstat (limited to 'target/linux/ar71xx/patches-4.9/451-gpio-74x164-improve-platform-device-support.patch')
-rw-r--r-- | target/linux/ar71xx/patches-4.9/451-gpio-74x164-improve-platform-device-support.patch | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/target/linux/ar71xx/patches-4.9/451-gpio-74x164-improve-platform-device-support.patch b/target/linux/ar71xx/patches-4.9/451-gpio-74x164-improve-platform-device-support.patch new file mode 100644 index 0000000000..d9cfa888fb --- /dev/null +++ b/target/linux/ar71xx/patches-4.9/451-gpio-74x164-improve-platform-device-support.patch @@ -0,0 +1,117 @@ +--- 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> +@@ -103,9 +104,16 @@ 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 = spi->dev.platform_data; ++ struct device_node *np = spi->dev.of_node; + u32 nregs; + int ret; + ++ if (!np && !pdata) { ++ dev_err(&spi->dev, "No configuration data available.\n"); ++ return -EINVAL; ++ } ++ + /* + * bits_per_word cannot be configured in platform data + */ +@@ -115,17 +123,23 @@ static int gen_74x164_probe(struct spi_d + if (ret < 0) + return ret; + +- if (of_property_read_u32(spi->dev.of_node, "registers-number", +- &nregs)) { +- dev_err(&spi->dev, +- "Missing registers-number property in the DT.\n"); +- return -EINVAL; +- } ++ if (np) { ++ if (of_property_read_u32(np, "registers-number", &nregs)) { ++ dev_err(&spi->dev, ++ "Missing registers-number property in the DT.\n"); ++ return -EINVAL; ++ } ++ } else if (pdata) { ++ nregs = pdata->num_registers; ++ } + + chip = devm_kzalloc(&spi->dev, sizeof(*chip) + nregs, GFP_KERNEL); + if (!chip) + return -ENOMEM; + ++ if (pdata && pdata->init_data) ++ memcpy(chip->buffer, pdata->init_data, chip->registers); ++ + spi_set_drvdata(spi, chip); + + chip->gpio_chip.label = spi->modalias; +@@ -133,7 +147,11 @@ static int gen_74x164_probe(struct spi_d + chip->gpio_chip.get = gen_74x164_get_value; + chip->gpio_chip.set = gen_74x164_set_value; + chip->gpio_chip.set_multiple = gen_74x164_set_multiple; +- chip->gpio_chip.base = -1; ++ if (np) ++ chip->gpio_chip.base = -1; ++ else if (pdata) ++ chip->gpio_chip.base = pdata->base; ++ + + chip->registers = nregs; + chip->gpio_chip.ngpio = GEN_74X164_NUMBER_GPIOS * chip->registers; +@@ -170,17 +188,19 @@ 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" }, + { .compatible = "nxp,74lvc594" }, + {}, + }; + 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 +@@ -1154,7 +1154,6 @@ menu "SPI GPIO expanders" + + config GPIO_74X164 + tristate "74x164 serial-in/parallel-out 8-bits shift register" +- depends on OF_GPIO + help + Driver for 74x164 compatible serial-in/parallel-out 8-outputs + shift registers. This driver can be used to provide access |