drivers/pinctrl/bcm/pinctrl-bcm63xx.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Driver for BCM63xx GPIO unit (pinctrl + GPIO)
   4  *
   5  * Copyright (C) 2021 Álvaro Fernández Rojas <noltari@gmail.com>
   6  * Copyright (C) 2016 Jonas Gorski <jonas.gorski@gmail.com>
   7  */
   8
   9 #include <linux/gpio/regmap.h>
  10 #include <linux/mfd/syscon.h>
  11 #include <linux/mod_devicetable.h>
  12 #include <linux/of.h>
  13 #include <linux/platform_device.h>
  14
  15 #include "pinctrl-bcm63xx.h"
  16
  17 #define BCM63XX_BANK_SIZE       4
  18
  19 #define BCM63XX_DIROUT_REG      0x04
  20 #define BCM63XX_DATA_REG        0x0c
  21
  22 static int bcm63xx_reg_mask_xlate(struct gpio_regmap *gpio,
  23                                   unsigned int base, unsigned int offset,
  24                                   unsigned int *reg, unsigned int *mask)
  25 {
  26         unsigned int line = offset % BCM63XX_BANK_GPIOS;
  27         unsigned int stride = offset / BCM63XX_BANK_GPIOS;
  28
  29         *reg = base - stride * BCM63XX_BANK_SIZE;
  30         *mask = BIT(line);
  31
  32         return 0;
  33 }
  34
  35 static const struct of_device_id bcm63xx_gpio_of_match[] = {
  36         { .compatible = "brcm,bcm6318-gpio", },
  37         { .compatible = "brcm,bcm6328-gpio", },
  38         { .compatible = "brcm,bcm6358-gpio", },
  39         { .compatible = "brcm,bcm6362-gpio", },
  40         { .compatible = "brcm,bcm6368-gpio", },
  41         { .compatible = "brcm,bcm63268-gpio", },
  42         { /* sentinel */ }
  43 };
  44
  45 static int bcm63xx_gpio_probe(struct device *dev, struct device_node *node,
  46                               const struct bcm63xx_pinctrl_soc *soc,
  47                               struct bcm63xx_pinctrl *pc)
  48 {
  49         struct gpio_regmap_config grc = {0};
  50
  51         grc.parent = dev;
  52         grc.fwnode = &node->fwnode;
  53         grc.ngpio = soc->ngpios;
  54         grc.ngpio_per_reg = BCM63XX_BANK_GPIOS;
  55         grc.regmap = pc->regs;
  56         grc.reg_dat_base = BCM63XX_DATA_REG;
  57         grc.reg_dir_out_base = BCM63XX_DIROUT_REG;
  58         grc.reg_set_base = BCM63XX_DATA_REG;
  59         grc.reg_mask_xlate = bcm63xx_reg_mask_xlate;
  60
  61         return PTR_ERR_OR_ZERO(devm_gpio_regmap_register(dev, &grc));
  62 }
  63
  64 int bcm63xx_pinctrl_probe(struct platform_device *pdev,
  65                           const struct bcm63xx_pinctrl_soc *soc,
  66                           void *driver_data)
  67 {
  68         struct device *dev = &pdev->dev;
  69         struct bcm63xx_pinctrl *pc;
  70         int err;
  71
  72         pc = devm_kzalloc(dev, sizeof(*pc), GFP_KERNEL);
  73         if (!pc)
  74                 return -ENOMEM;
  75
  76         platform_set_drvdata(pdev, pc);
  77
  78         pc->dev = dev;
  79         pc->driver_data = driver_data;
  80
  81         pc->regs = syscon_node_to_regmap(dev->parent->of_node);
  82         if (IS_ERR(pc->regs))
  83                 return PTR_ERR(pc->regs);
  84
  85         pc->pctl_desc.name = dev_name(dev);
  86         pc->pctl_desc.pins = soc->pins;
  87         pc->pctl_desc.npins = soc->npins;
  88         pc->pctl_desc.pctlops = soc->pctl_ops;
  89         pc->pctl_desc.pmxops = soc->pmx_ops;
  90         pc->pctl_desc.owner = THIS_MODULE;
  91
  92         pc->pctl_dev = devm_pinctrl_register(dev, &pc->pctl_desc, pc);
  93         if (IS_ERR(pc->pctl_dev))
  94                 return PTR_ERR(pc->pctl_dev);
  95
  96         for_each_child_of_node_scoped(dev->parent->of_node, node) {
  97                 if (of_match_node(bcm63xx_gpio_of_match, node)) {
  98                         err = bcm63xx_gpio_probe(dev, node, soc, pc);
  99                         if (err) {
 100                                 dev_err(dev, "could not add GPIO chip\n");
 101                                 return err;
 102                         }
 103                 }
 104         }
 105
 106         return 0;
 107 }