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132f95016d
Add a helper for registering BCM63XX pin controllers. Co-developed-by: Jonas Gorski <jonas.gorski@gmail.com> Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com> Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com> Link: https://lore.kernel.org/r/20210324081923.20379-5-noltari@gmail.com Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
110 lines
2.8 KiB
C
110 lines
2.8 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Driver for BCM63xx GPIO unit (pinctrl + GPIO)
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*
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* Copyright (C) 2021 Álvaro Fernández Rojas <noltari@gmail.com>
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* Copyright (C) 2016 Jonas Gorski <jonas.gorski@gmail.com>
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*/
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#include <linux/gpio/regmap.h>
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#include <linux/mfd/syscon.h>
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#include <linux/mod_devicetable.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include "pinctrl-bcm63xx.h"
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#define BCM63XX_BANK_SIZE 4
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#define BCM63XX_DIROUT_REG 0x04
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#define BCM63XX_DATA_REG 0x0c
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static int bcm63xx_reg_mask_xlate(struct gpio_regmap *gpio,
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unsigned int base, unsigned int offset,
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unsigned int *reg, unsigned int *mask)
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{
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unsigned int line = offset % BCM63XX_BANK_GPIOS;
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unsigned int stride = offset / BCM63XX_BANK_GPIOS;
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*reg = base - stride * BCM63XX_BANK_SIZE;
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*mask = BIT(line);
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return 0;
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}
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static const struct of_device_id bcm63xx_gpio_of_match[] = {
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{ .compatible = "brcm,bcm6318-gpio", },
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{ .compatible = "brcm,bcm6328-gpio", },
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{ .compatible = "brcm,bcm6358-gpio", },
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{ .compatible = "brcm,bcm6362-gpio", },
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{ .compatible = "brcm,bcm6368-gpio", },
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{ .compatible = "brcm,bcm63268-gpio", },
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{ /* sentinel */ }
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};
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static int bcm63xx_gpio_probe(struct device *dev, struct device_node *node,
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const struct bcm63xx_pinctrl_soc *soc,
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struct bcm63xx_pinctrl *pc)
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{
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struct gpio_regmap_config grc = {0};
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grc.parent = dev;
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grc.fwnode = &node->fwnode;
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grc.ngpio = soc->ngpios;
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grc.ngpio_per_reg = BCM63XX_BANK_GPIOS;
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grc.regmap = pc->regs;
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grc.reg_dat_base = BCM63XX_DATA_REG;
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grc.reg_dir_out_base = BCM63XX_DIROUT_REG;
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grc.reg_set_base = BCM63XX_DATA_REG;
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grc.reg_mask_xlate = bcm63xx_reg_mask_xlate;
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return PTR_ERR_OR_ZERO(devm_gpio_regmap_register(dev, &grc));
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}
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int bcm63xx_pinctrl_probe(struct platform_device *pdev,
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const struct bcm63xx_pinctrl_soc *soc,
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void *driver_data)
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{
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struct device *dev = &pdev->dev;
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struct bcm63xx_pinctrl *pc;
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struct device_node *node;
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int err;
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pc = devm_kzalloc(dev, sizeof(*pc), GFP_KERNEL);
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if (!pc)
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return -ENOMEM;
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platform_set_drvdata(pdev, pc);
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pc->dev = dev;
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pc->driver_data = driver_data;
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pc->regs = syscon_node_to_regmap(dev->parent->of_node);
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if (IS_ERR(pc->regs))
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return PTR_ERR(pc->regs);
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pc->pctl_desc.name = dev_name(dev);
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pc->pctl_desc.pins = soc->pins;
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pc->pctl_desc.npins = soc->npins;
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pc->pctl_desc.pctlops = soc->pctl_ops;
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pc->pctl_desc.pmxops = soc->pmx_ops;
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pc->pctl_desc.owner = THIS_MODULE;
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pc->pctl_dev = devm_pinctrl_register(dev, &pc->pctl_desc, pc);
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if (IS_ERR(pc->pctl_dev))
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return PTR_ERR(pc->pctl_dev);
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for_each_child_of_node(dev->parent->of_node, node) {
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if (of_match_node(bcm63xx_gpio_of_match, node)) {
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err = bcm63xx_gpio_probe(dev, node, soc, pc);
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if (err) {
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dev_err(dev, "could not add GPIO chip\n");
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of_node_put(node);
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return err;
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}
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}
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}
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return 0;
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}
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