target/linux/ar71xx/patches-4.4/451-gpio-74x164-improve-platform-device-support.patch

   1 --- a/drivers/gpio/gpio-74x164.c
   2 +++ b/drivers/gpio/gpio-74x164.c
   3 @@ -12,6 +12,7 @@
   4  #include <linux/init.h>
   5  #include <linux/mutex.h>
   6  #include <linux/spi/spi.h>
   7 +#include <linux/spi/74x164.h>
   8  #include <linux/gpio.h>
   9  #include <linux/of_gpio.h>
  10  #include <linux/slab.h>
  11 @@ -107,8 +108,18 @@ static int gen_74x164_direction_output(s
  12  static int gen_74x164_probe(struct spi_device *spi)
  13  {
  14         struct gen_74x164_chip *chip;
  15 +       struct gen_74x164_chip_platform_data *pdata;
  16 +       struct device_node *np;
  17         int ret;
  18
  19 +       pdata = spi->dev.platform_data;
  20 +       np = spi->dev.of_node;
  21 +
  22 +       if (!np && !pdata) {
  23 +               dev_err(&spi->dev, "No configuration data available.\n");
  24 +               return -EINVAL;
  25 +       }
  26 +
  27         /*
  28          * bits_per_word cannot be configured in platform data
  29          */
  30 @@ -130,18 +141,28 @@ static int gen_74x164_probe(struct spi_d
  31         chip->gpio_chip.set = gen_74x164_set_value;
  32         chip->gpio_chip.base = -1;
  33
  34 -       if (of_property_read_u32(spi->dev.of_node, "registers-number",
  35 -                                &chip->registers)) {
  36 -               dev_err(&spi->dev,
  37 -                       "Missing registers-number property in the DT.\n");
  38 -               return -EINVAL;
  39 +       if (np) {
  40 +               if (of_property_read_u32(spi->dev.of_node, "registers-number", &chip->registers)) {
  41 +                       dev_err(&spi->dev, "Missing registers-number property in the DT.\n");
  42 +                       ret = -EINVAL;
  43 +                       goto exit_destroy;
  44 +               }
  45 +       } else if (pdata) {
  46 +               chip->gpio_chip.base = pdata->base;
  47 +               chip->registers = pdata->num_registers;
  48         }
  49
  50 +       if (!chip->registers)
  51 +               chip->registers = 1;
  52 +
  53         chip->gpio_chip.ngpio = GEN_74X164_NUMBER_GPIOS * chip->registers;
  54         chip->buffer = devm_kzalloc(&spi->dev, chip->registers, GFP_KERNEL);
  55         if (!chip->buffer)
  56                 return -ENOMEM;
  57
  58 +       if (pdata && pdata->init_data)
  59 +               memcpy(chip->buffer, pdata->init_data, chip->registers);
  60 +
  61         chip->gpio_chip.can_sleep = true;
  62         chip->gpio_chip.dev = &spi->dev;
  63         chip->gpio_chip.owner = THIS_MODULE;
  64 @@ -174,16 +195,18 @@ static int gen_74x164_remove(struct spi_
  65         return 0;
  66  }
  67
  68 +#ifdef CONFIG_OF
  69  static const struct of_device_id gen_74x164_dt_ids[] = {
  70         { .compatible = "fairchild,74hc595" },
  71         {},
  72  };
  73  MODULE_DEVICE_TABLE(of, gen_74x164_dt_ids);
  74 +#endif
  75
  76  static struct spi_driver gen_74x164_driver = {
  77         .driver = {
  78                 .name           = "74x164",
  79 -               .of_match_table = gen_74x164_dt_ids,
  80 +               .of_match_table = of_match_ptr(gen_74x164_dt_ids),
  81         },
  82         .probe          = gen_74x164_probe,
  83         .remove         = gen_74x164_remove,
  84 --- /dev/null
  85 +++ b/include/linux/spi/74x164.h
  86 @@ -0,0 +1,13 @@
  87 +#ifndef LINUX_SPI_74X164_H
  88 +#define LINUX_SPI_74X164_H
  89 +
  90 +struct gen_74x164_chip_platform_data {
  91 +       /* number assigned to the first GPIO */
  92 +       unsigned        base;
  93 +       /* number of chained registers */
  94 +       unsigned        num_registers;
  95 +       /* address of a buffer containing initial data */
  96 +       u8              *init_data;
  97 +};
  98 +
  99 +#endif
 100 --- a/drivers/gpio/Kconfig
 101 +++ b/drivers/gpio/Kconfig
 102 @@ -990,7 +990,6 @@ menu "SPI GPIO expanders"
 103
 104  config GPIO_74X164
 105         tristate "74x164 serial-in/parallel-out 8-bits shift register"
 106 -       depends on OF
 107         help
 108           Driver for 74x164 compatible serial-in/parallel-out 8-outputs
 109           shift registers. This driver can be used to provide access