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