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![Simon Glass](/assets/img/avatar_default.png)
This function can be called when it is not known whether it will find anything. This results in confusing log messages if the device is not found. It is better for the caller to log the failure, if necessary. Drop the logging from this function. Signed-off-by: Simon Glass <sjg@chromium.org>
217 lines
4.8 KiB
C
217 lines
4.8 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2015 Google, Inc
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* Written by Simon Glass <sjg@chromium.org>
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*/
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#define LOG_CATEGORY UCLASS_SYSCON
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#include <common.h>
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#include <log.h>
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#include <syscon.h>
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#include <dm.h>
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#include <errno.h>
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#include <regmap.h>
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#include <dm/device-internal.h>
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#include <dm/device_compat.h>
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#include <dm/lists.h>
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#include <dm/root.h>
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#include <linux/err.h>
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/*
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* Caution:
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* This API requires the given device has already been bound to the syscon
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* driver. For example,
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*
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* compatible = "syscon", "simple-mfd";
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*
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* works, but
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*
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* compatible = "simple-mfd", "syscon";
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*
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* does not. The behavior is different from Linux.
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*/
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struct regmap *syscon_get_regmap(struct udevice *dev)
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{
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struct syscon_uc_info *priv;
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if (device_get_uclass_id(dev) != UCLASS_SYSCON)
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return ERR_PTR(-ENOEXEC);
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priv = dev_get_uclass_priv(dev);
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return priv->regmap;
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}
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static int syscon_pre_probe(struct udevice *dev)
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{
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struct syscon_uc_info *priv = dev_get_uclass_priv(dev);
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/* Special case for PCI devices, which don't have a regmap */
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if (device_get_uclass_id(dev->parent) == UCLASS_PCI)
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return 0;
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/*
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* With OF_PLATDATA we really have no way of knowing the format of
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* the device-specific platform data. So we assume that it starts with
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* a 'reg' member, and this holds a single address and size. Drivers
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* using OF_PLATDATA will need to ensure that this is true.
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*/
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#if CONFIG_IS_ENABLED(OF_PLATDATA)
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struct syscon_base_platdata *plat = dev_get_platdata(dev);
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return regmap_init_mem_platdata(dev, plat->reg, ARRAY_SIZE(plat->reg),
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&priv->regmap);
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#else
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return regmap_init_mem(dev_ofnode(dev), &priv->regmap);
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#endif
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}
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static int syscon_probe_by_ofnode(ofnode node, struct udevice **devp)
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{
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struct udevice *dev, *parent;
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int ret;
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/* found node with "syscon" compatible, not bounded to SYSCON UCLASS */
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if (!ofnode_device_is_compatible(node, "syscon")) {
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log_debug("invalid compatible for syscon device\n");
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return -EINVAL;
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}
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/* bound to driver with same ofnode or to root if not found */
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if (device_find_global_by_ofnode(node, &parent))
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parent = dm_root();
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/* force bound to syscon class */
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ret = device_bind_driver_to_node(parent, "syscon",
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ofnode_get_name(node),
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node, &dev);
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if (ret) {
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dev_dbg(dev, "unable to bound syscon device\n");
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return ret;
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}
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ret = device_probe(dev);
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if (ret) {
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dev_dbg(dev, "unable to probe syscon device\n");
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return ret;
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}
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*devp = dev;
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return 0;
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}
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struct regmap *syscon_regmap_lookup_by_phandle(struct udevice *dev,
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const char *name)
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{
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struct udevice *syscon;
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struct regmap *r;
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u32 phandle;
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ofnode node;
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int err;
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err = uclass_get_device_by_phandle(UCLASS_SYSCON, dev,
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name, &syscon);
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if (err) {
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/* found node with "syscon" compatible, not bounded to SYSCON */
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err = ofnode_read_u32(dev_ofnode(dev), name, &phandle);
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if (err)
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return ERR_PTR(err);
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node = ofnode_get_by_phandle(phandle);
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if (!ofnode_valid(node)) {
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dev_dbg(dev, "unable to find syscon device\n");
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return ERR_PTR(-EINVAL);
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}
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err = syscon_probe_by_ofnode(node, &syscon);
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if (err)
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return ERR_PTR(-ENODEV);
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}
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r = syscon_get_regmap(syscon);
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if (!r) {
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dev_dbg(dev, "unable to find regmap\n");
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return ERR_PTR(-ENODEV);
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}
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return r;
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}
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int syscon_get_by_driver_data(ulong driver_data, struct udevice **devp)
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{
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int ret;
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*devp = NULL;
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ret = uclass_first_device_drvdata(UCLASS_SYSCON, driver_data, devp);
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if (ret)
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return ret;
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return 0;
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}
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struct regmap *syscon_get_regmap_by_driver_data(ulong driver_data)
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{
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struct syscon_uc_info *priv;
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struct udevice *dev;
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int ret;
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ret = syscon_get_by_driver_data(driver_data, &dev);
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if (ret)
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return ERR_PTR(ret);
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priv = dev_get_uclass_priv(dev);
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return priv->regmap;
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}
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void *syscon_get_first_range(ulong driver_data)
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{
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struct regmap *map;
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map = syscon_get_regmap_by_driver_data(driver_data);
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if (IS_ERR(map))
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return map;
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return regmap_get_range(map, 0);
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}
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UCLASS_DRIVER(syscon) = {
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.id = UCLASS_SYSCON,
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.name = "syscon",
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.per_device_auto_alloc_size = sizeof(struct syscon_uc_info),
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.pre_probe = syscon_pre_probe,
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};
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static const struct udevice_id generic_syscon_ids[] = {
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{ .compatible = "syscon" },
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{ }
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};
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U_BOOT_DRIVER(generic_syscon) = {
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.name = "syscon",
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.id = UCLASS_SYSCON,
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#if !CONFIG_IS_ENABLED(OF_PLATDATA)
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.bind = dm_scan_fdt_dev,
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#endif
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.of_match = generic_syscon_ids,
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};
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/*
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* Linux-compatible syscon-to-regmap
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* The syscon node can be bound to another driver, but still works
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* as a syscon provider.
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*/
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struct regmap *syscon_node_to_regmap(ofnode node)
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{
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struct udevice *dev;
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struct regmap *r;
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if (uclass_get_device_by_ofnode(UCLASS_SYSCON, node, &dev))
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if (syscon_probe_by_ofnode(node, &dev))
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return ERR_PTR(-ENODEV);
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r = syscon_get_regmap(dev);
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if (!r) {
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dev_dbg(dev, "unable to find regmap\n");
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return ERR_PTR(-ENODEV);
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}
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return r;
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}
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