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![Masahiro Yamada](/assets/img/avatar_default.png)
This function returns the pointer to the value of a node property. The current name ofnode_read_prop() is confusing. Follow the naming of_get_property() from Linux. The return type (const u32 *) is wrong. DT property values can be strings as well as integers. This is why of_get_property/fdt_getprop returns an opaque pointer. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Acked-by: Simon Glass <sjg@chromium.org>
290 lines
6.4 KiB
C
290 lines
6.4 KiB
C
/*
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* Copyright (C) 2015 Masahiro Yamada <yamada.masahiro@socionext.com>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <libfdt.h>
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#include <linux/err.h>
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#include <linux/list.h>
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#include <dm.h>
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#include <dm/lists.h>
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#include <dm/pinctrl.h>
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#include <dm/util.h>
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DECLARE_GLOBAL_DATA_PTR;
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int pinctrl_decode_pin_config(const void *blob, int node)
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{
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int flags = 0;
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if (fdtdec_get_bool(blob, node, "bias-pull-up"))
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flags |= 1 << PIN_CONFIG_BIAS_PULL_UP;
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else if (fdtdec_get_bool(blob, node, "bias-pull-down"))
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flags |= 1 << PIN_CONFIG_BIAS_PULL_DOWN;
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return flags;
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}
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#if CONFIG_IS_ENABLED(PINCTRL_FULL)
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/**
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* pinctrl_config_one() - apply pinctrl settings for a single node
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*
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* @config: pin configuration node
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* @return: 0 on success, or negative error code on failure
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*/
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static int pinctrl_config_one(struct udevice *config)
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{
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struct udevice *pctldev;
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const struct pinctrl_ops *ops;
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pctldev = config;
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for (;;) {
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pctldev = dev_get_parent(pctldev);
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if (!pctldev) {
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dev_err(config, "could not find pctldev\n");
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return -EINVAL;
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}
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if (pctldev->uclass->uc_drv->id == UCLASS_PINCTRL)
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break;
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}
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ops = pinctrl_get_ops(pctldev);
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return ops->set_state(pctldev, config);
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}
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/**
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* pinctrl_select_state_full() - full implementation of pinctrl_select_state
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*
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* @dev: peripheral device
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* @statename: state name, like "default"
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* @return: 0 on success, or negative error code on failure
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*/
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static int pinctrl_select_state_full(struct udevice *dev, const char *statename)
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{
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const void *fdt = gd->fdt_blob;
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int node = dev_of_offset(dev);
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char propname[32]; /* long enough */
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const fdt32_t *list;
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uint32_t phandle;
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int config_node;
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struct udevice *config;
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int state, size, i, ret;
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state = fdt_stringlist_search(fdt, node, "pinctrl-names", statename);
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if (state < 0) {
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char *end;
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/*
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* If statename is not found in "pinctrl-names",
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* assume statename is just the integer state ID.
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*/
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state = simple_strtoul(statename, &end, 10);
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if (*end)
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return -EINVAL;
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}
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snprintf(propname, sizeof(propname), "pinctrl-%d", state);
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list = fdt_getprop(fdt, node, propname, &size);
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if (!list)
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return -EINVAL;
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size /= sizeof(*list);
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for (i = 0; i < size; i++) {
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phandle = fdt32_to_cpu(*list++);
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config_node = fdt_node_offset_by_phandle(fdt, phandle);
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if (config_node < 0) {
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dev_err(dev, "prop %s index %d invalid phandle\n",
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propname, i);
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return -EINVAL;
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}
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ret = uclass_get_device_by_of_offset(UCLASS_PINCONFIG,
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config_node, &config);
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if (ret)
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return ret;
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ret = pinctrl_config_one(config);
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if (ret)
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return ret;
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}
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return 0;
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}
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/**
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* pinconfig_post_bind() - post binding for PINCONFIG uclass
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* Recursively bind its children as pinconfig devices.
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*
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* @dev: pinconfig device
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* @return: 0 on success, or negative error code on failure
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*/
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static int pinconfig_post_bind(struct udevice *dev)
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{
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bool pre_reloc_only = !(gd->flags & GD_FLG_RELOC);
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const char *name;
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ofnode node;
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int ret;
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dev_for_each_subnode(node, dev) {
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if (pre_reloc_only &&
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!ofnode_pre_reloc(node))
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continue;
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/*
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* If this node has "compatible" property, this is not
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* a pin configuration node, but a normal device. skip.
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*/
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ofnode_get_property(node, "compatible", &ret);
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if (ret >= 0)
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continue;
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if (ret != -FDT_ERR_NOTFOUND)
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return ret;
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name = ofnode_get_name(node);
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if (!name)
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return -EINVAL;
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ret = device_bind_driver_to_node(dev, "pinconfig", name,
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node, NULL);
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if (ret)
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return ret;
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}
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return 0;
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}
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UCLASS_DRIVER(pinconfig) = {
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.id = UCLASS_PINCONFIG,
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.post_bind = pinconfig_post_bind,
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.name = "pinconfig",
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};
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U_BOOT_DRIVER(pinconfig_generic) = {
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.name = "pinconfig",
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.id = UCLASS_PINCONFIG,
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};
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#else
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static int pinctrl_select_state_full(struct udevice *dev, const char *statename)
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{
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return -ENODEV;
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}
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static int pinconfig_post_bind(struct udevice *dev)
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{
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return 0;
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}
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#endif
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/**
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* pinctrl_select_state_simple() - simple implementation of pinctrl_select_state
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*
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* @dev: peripheral device
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* @return: 0 on success, or negative error code on failure
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*/
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static int pinctrl_select_state_simple(struct udevice *dev)
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{
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struct udevice *pctldev;
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struct pinctrl_ops *ops;
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int ret;
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/*
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* For simplicity, assume the first device of PINCTRL uclass
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* is the correct one. This is most likely OK as there is
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* usually only one pinctrl device on the system.
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*/
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ret = uclass_get_device(UCLASS_PINCTRL, 0, &pctldev);
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if (ret)
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return ret;
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ops = pinctrl_get_ops(pctldev);
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if (!ops->set_state_simple) {
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dev_dbg(dev, "set_state_simple op missing\n");
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return -ENOSYS;
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}
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return ops->set_state_simple(pctldev, dev);
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}
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int pinctrl_select_state(struct udevice *dev, const char *statename)
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{
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/*
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* Try full-implemented pinctrl first.
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* If it fails or is not implemented, try simple one.
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*/
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if (pinctrl_select_state_full(dev, statename))
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return pinctrl_select_state_simple(dev);
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return 0;
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}
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int pinctrl_request(struct udevice *dev, int func, int flags)
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{
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struct pinctrl_ops *ops = pinctrl_get_ops(dev);
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if (!ops->request)
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return -ENOSYS;
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return ops->request(dev, func, flags);
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}
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int pinctrl_request_noflags(struct udevice *dev, int func)
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{
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return pinctrl_request(dev, func, 0);
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}
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int pinctrl_get_periph_id(struct udevice *dev, struct udevice *periph)
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{
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struct pinctrl_ops *ops = pinctrl_get_ops(dev);
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if (!ops->get_periph_id)
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return -ENOSYS;
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return ops->get_periph_id(dev, periph);
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}
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int pinctrl_get_gpio_mux(struct udevice *dev, int banknum, int index)
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{
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struct pinctrl_ops *ops = pinctrl_get_ops(dev);
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if (!ops->get_gpio_mux)
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return -ENOSYS;
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return ops->get_gpio_mux(dev, banknum, index);
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}
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/**
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* pinconfig_post_bind() - post binding for PINCTRL uclass
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* Recursively bind child nodes as pinconfig devices in case of full pinctrl.
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*
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* @dev: pinctrl device
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* @return: 0 on success, or negative error code on failure
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*/
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static int pinctrl_post_bind(struct udevice *dev)
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{
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const struct pinctrl_ops *ops = pinctrl_get_ops(dev);
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if (!ops) {
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dev_dbg(dev, "ops is not set. Do not bind.\n");
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return -EINVAL;
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}
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/*
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* If set_state callback is set, we assume this pinctrl driver is the
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* full implementation. In this case, its child nodes should be bound
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* so that peripheral devices can easily search in parent devices
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* during later DT-parsing.
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*/
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if (ops->set_state)
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return pinconfig_post_bind(dev);
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return 0;
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}
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UCLASS_DRIVER(pinctrl) = {
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.id = UCLASS_PINCTRL,
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.post_bind = pinctrl_post_bind,
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.flags = DM_UC_FLAG_SEQ_ALIAS,
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.name = "pinctrl",
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};
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