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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.patch111
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..5d29fae
--- /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
+@@ -821,7 +821,7 @@ config GPIO_MC33880
+
+ 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