This commit introduces the PMIC uclass implementation. It allows providing the basic I/O interface for PMIC devices. For the multi-function PMIC devices, this can be used as I/O parent device, for each IC's interface. Then, each PMIC particular function can be provided by the child device's operations, and the child devices will use its parent for read/write by the common API. Core files: - 'include/power/pmic.h' - 'drivers/power/pmic/pmic-uclass.c' The old pmic framework is still kept and is independent. For more detailed informations, please look into the header file. Changes: - new uclass-id: UCLASS_PMIC - new config: CONFIG_DM_PMIC Signed-off-by: Przemyslaw Marczak <p.marczak@samsung.com> Acked-by: Simon Glass <sjg@chromium.org>master
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6501ff6251
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config DM_PMIC |
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bool "Enable Driver Model for PMIC drivers (UCLASS_PMIC)" |
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depends on DM |
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---help--- |
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This config enables the driver-model PMIC support. |
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UCLASS_PMIC - designed to provide an I/O interface for PMIC devices. |
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For the multi-function PMIC devices, this can be used as parent I/O |
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device for each IC's interface. Then, each children uses its parent |
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for read/write. For detailed description, please refer to the files: |
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- 'drivers/power/pmic/pmic-uclass.c' |
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- 'include/power/pmic.h' |
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/*
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* Copyright (C) 2014-2015 Samsung Electronics |
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* Przemyslaw Marczak <p.marczak@samsung.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 <fdtdec.h> |
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#include <errno.h> |
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#include <dm.h> |
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#include <dm/lists.h> |
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#include <dm/device-internal.h> |
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#include <dm/uclass-internal.h> |
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#include <power/pmic.h> |
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#include <linux/ctype.h> |
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DECLARE_GLOBAL_DATA_PTR; |
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static ulong str_get_num(const char *ptr, const char *maxptr) |
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{ |
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if (!ptr || !maxptr) |
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return 0; |
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while (!isdigit(*ptr) && ptr++ < maxptr); |
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return simple_strtoul(ptr, NULL, 0); |
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} |
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int pmic_bind_childs(struct udevice *pmic, int offset, |
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const struct pmic_child_info *child_info) |
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{ |
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const struct pmic_child_info *info; |
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const void *blob = gd->fdt_blob; |
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struct driver *drv; |
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struct udevice *child; |
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const char *node_name; |
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int node_name_len; |
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int bind_count = 0; |
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int node; |
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int prefix_len; |
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int ret; |
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debug("%s for '%s' at node offset: %d\n", __func__, pmic->name, |
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pmic->of_offset); |
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for (node = fdt_first_subnode(blob, offset); |
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node > 0; |
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node = fdt_next_subnode(blob, node)) { |
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node_name = fdt_get_name(blob, node, &node_name_len); |
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debug("* Found child node: '%s' at offset:%d\n", node_name, |
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node); |
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child = NULL; |
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info = child_info; |
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while (info->prefix) { |
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prefix_len = strlen(info->prefix); |
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if (strncasecmp(info->prefix, node_name, prefix_len) || |
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!info->driver) { |
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info++; |
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continue; |
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} |
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debug(" - compatible prefix: '%s'\n", info->prefix); |
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drv = lists_driver_lookup_name(info->driver); |
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if (!drv) { |
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debug(" - driver: '%s' not found!\n", |
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info->driver); |
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continue; |
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} |
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debug(" - found child driver: '%s'\n", drv->name); |
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ret = device_bind(pmic, drv, node_name, NULL, |
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node, &child); |
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if (ret) { |
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debug(" - child binding error: %d\n", ret); |
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continue; |
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} |
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debug(" - bound child device: '%s'\n", child->name); |
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child->driver_data = str_get_num(node_name + |
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prefix_len, |
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node_name + |
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node_name_len); |
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debug(" - set 'child->driver_data': %lu\n", |
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child->driver_data); |
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break; |
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} |
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if (child) |
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bind_count++; |
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else |
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debug(" - compatible prefix not found\n"); |
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} |
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debug("Bound: %d childs for PMIC: '%s'\n", bind_count, pmic->name); |
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return bind_count; |
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} |
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int pmic_get(const char *name, struct udevice **devp) |
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{ |
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return uclass_get_device_by_name(UCLASS_PMIC, name, devp); |
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} |
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int pmic_reg_count(struct udevice *dev) |
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{ |
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const struct dm_pmic_ops *ops = dev_get_driver_ops(dev); |
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if (!ops) |
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return -ENOSYS; |
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return ops->reg_count; |
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} |
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int pmic_read(struct udevice *dev, uint reg, uint8_t *buffer, int len) |
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{ |
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const struct dm_pmic_ops *ops = dev_get_driver_ops(dev); |
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int ret; |
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if (!buffer) |
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return -EFAULT; |
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if (!ops || !ops->read) |
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return -ENOSYS; |
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ret = ops->read(dev, reg, buffer, len); |
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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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int pmic_write(struct udevice *dev, uint reg, const uint8_t *buffer, int len) |
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{ |
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const struct dm_pmic_ops *ops = dev_get_driver_ops(dev); |
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int ret; |
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if (!buffer) |
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return -EFAULT; |
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if (!ops || !ops->write) |
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return -ENOSYS; |
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ret = ops->write(dev, reg, buffer, len); |
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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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UCLASS_DRIVER(pmic) = { |
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.id = UCLASS_PMIC, |
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.name = "pmic", |
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}; |
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