1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (c) 2014, The Linux Foundation. All rights reserved.
6 #include <linux/device.h>
7 #include <linux/errno.h>
9 #include <linux/kernel.h>
10 #include <linux/module.h>
11 #include <linux/spmi.h>
12 #include <linux/types.h>
13 #include <linux/regmap.h>
14 #include <linux/of_platform.h>
15 #include <soc/qcom/qcom-spmi-pmic.h>
17 #define PMIC_REV2 0x101
18 #define PMIC_REV3 0x102
19 #define PMIC_REV4 0x103
20 #define PMIC_TYPE 0x104
21 #define PMIC_SUBTYPE 0x105
22 #define PMIC_FAB_ID 0x1f2
24 #define PMIC_TYPE_VALUE 0x51
26 #define PMIC_REV4_V2 0x02
28 struct qcom_spmi_dev {
30 struct qcom_spmi_pmic pmic;
33 #define N_USIDS(n) ((void *)n)
35 static const struct of_device_id pmic_spmi_id_table[] = {
36 { .compatible = "qcom,pm660", .data = N_USIDS(2) },
37 { .compatible = "qcom,pm660l", .data = N_USIDS(2) },
38 { .compatible = "qcom,pm8004", .data = N_USIDS(2) },
39 { .compatible = "qcom,pm8005", .data = N_USIDS(2) },
40 { .compatible = "qcom,pm8019", .data = N_USIDS(2) },
41 { .compatible = "qcom,pm8028", .data = N_USIDS(2) },
42 { .compatible = "qcom,pm8110", .data = N_USIDS(2) },
43 { .compatible = "qcom,pm8150", .data = N_USIDS(2) },
44 { .compatible = "qcom,pm8150b", .data = N_USIDS(2) },
45 { .compatible = "qcom,pm8150c", .data = N_USIDS(2) },
46 { .compatible = "qcom,pm8150l", .data = N_USIDS(2) },
47 { .compatible = "qcom,pm8226", .data = N_USIDS(2) },
48 { .compatible = "qcom,pm8841", .data = N_USIDS(2) },
49 { .compatible = "qcom,pm8901", .data = N_USIDS(2) },
50 { .compatible = "qcom,pm8909", .data = N_USIDS(2) },
51 { .compatible = "qcom,pm8916", .data = N_USIDS(2) },
52 { .compatible = "qcom,pm8941", .data = N_USIDS(2) },
53 { .compatible = "qcom,pm8950", .data = N_USIDS(2) },
54 { .compatible = "qcom,pm8994", .data = N_USIDS(2) },
55 { .compatible = "qcom,pm8998", .data = N_USIDS(2) },
56 { .compatible = "qcom,pma8084", .data = N_USIDS(2) },
57 { .compatible = "qcom,pmd9635", .data = N_USIDS(2) },
58 { .compatible = "qcom,pmi8950", .data = N_USIDS(2) },
59 { .compatible = "qcom,pmi8962", .data = N_USIDS(2) },
60 { .compatible = "qcom,pmi8994", .data = N_USIDS(2) },
61 { .compatible = "qcom,pmi8998", .data = N_USIDS(2) },
62 { .compatible = "qcom,pmk8002", .data = N_USIDS(2) },
63 { .compatible = "qcom,pmp8074", .data = N_USIDS(2) },
64 { .compatible = "qcom,smb2351", .data = N_USIDS(2) },
65 { .compatible = "qcom,spmi-pmic", .data = N_USIDS(1) },
70 * A PMIC can be represented by multiple SPMI devices, but
71 * only the base PMIC device will contain a reference to
72 * the revision information.
74 * This function takes a pointer to a pmic device and
75 * returns a pointer to the base PMIC device.
77 * This only supports PMICs with 1 or 2 USIDs.
79 static struct spmi_device *qcom_pmic_get_base_usid(struct device *dev)
81 struct spmi_device *sdev;
82 struct qcom_spmi_dev *ctx;
83 struct device_node *spmi_bus;
84 struct device_node *child;
85 int function_parent_usid, ret;
88 sdev = to_spmi_device(dev);
89 ctx = dev_get_drvdata(&sdev->dev);
92 * Quick return if the function device is already in the base
93 * USID. This will always be hit for PMICs with only 1 USID.
95 if (sdev->usid % ctx->num_usids == 0)
98 function_parent_usid = sdev->usid;
101 * Walk through the list of PMICs until we find the sibling USID.
102 * The goal is to find the first USID which is less than the
103 * number of USIDs in the PMIC array, e.g. for a PMIC with 2 USIDs
104 * where the function device is under USID 3, we want to find the
107 spmi_bus = of_get_parent(sdev->dev.of_node);
108 sdev = ERR_PTR(-ENODATA);
109 for_each_child_of_node(spmi_bus, child) {
110 ret = of_property_read_u32_index(child, "reg", 0, &pmic_addr);
117 if (pmic_addr == function_parent_usid - (ctx->num_usids - 1)) {
118 sdev = spmi_device_from_of(child);
121 * If the base USID for this PMIC hasn't probed yet
122 * but the secondary USID has, then we need to defer
123 * the function driver so that it will attempt to
124 * probe again when the base USID is ready.
126 sdev = ERR_PTR(-EPROBE_DEFER);
133 of_node_put(spmi_bus);
138 static int pmic_spmi_load_revid(struct regmap *map, struct device *dev,
139 struct qcom_spmi_pmic *pmic)
143 ret = regmap_read(map, PMIC_TYPE, &pmic->type);
147 if (pmic->type != PMIC_TYPE_VALUE)
150 ret = regmap_read(map, PMIC_SUBTYPE, &pmic->subtype);
154 pmic->name = of_match_device(pmic_spmi_id_table, dev)->compatible;
156 ret = regmap_read(map, PMIC_REV2, &pmic->rev2);
160 ret = regmap_read(map, PMIC_REV3, &pmic->minor);
164 ret = regmap_read(map, PMIC_REV4, &pmic->major);
168 if (pmic->subtype == PMI8998_SUBTYPE || pmic->subtype == PM660_SUBTYPE) {
169 ret = regmap_read(map, PMIC_FAB_ID, &pmic->fab_id);
175 * In early versions of PM8941 and PM8226, the major revision number
176 * started incrementing from 0 (eg 0 = v1.0, 1 = v2.0).
177 * Increment the major revision number here if the chip is an early
178 * version of PM8941 or PM8226.
180 if ((pmic->subtype == PM8941_SUBTYPE || pmic->subtype == PM8226_SUBTYPE) &&
181 pmic->major < PMIC_REV4_V2)
184 if (pmic->subtype == PM8110_SUBTYPE)
185 pmic->minor = pmic->rev2;
187 dev_dbg(dev, "%x: %s v%d.%d\n",
188 pmic->subtype, pmic->name, pmic->major, pmic->minor);
194 * qcom_pmic_get() - Get a pointer to the base PMIC device
196 * This function takes a struct device for a driver which is a child of a PMIC.
197 * And locates the PMIC revision information for it.
199 * @dev: the pmic function device
200 * @return: the struct qcom_spmi_pmic* pointer associated with the function device
202 const struct qcom_spmi_pmic *qcom_pmic_get(struct device *dev)
204 struct spmi_device *sdev;
205 struct qcom_spmi_dev *spmi;
208 * Make sure the device is actually a child of a PMIC
210 if (!of_match_device(pmic_spmi_id_table, dev->parent))
211 return ERR_PTR(-EINVAL);
213 sdev = qcom_pmic_get_base_usid(dev->parent);
216 return ERR_CAST(sdev);
218 spmi = dev_get_drvdata(&sdev->dev);
222 EXPORT_SYMBOL(qcom_pmic_get);
224 static const struct regmap_config spmi_regmap_config = {
227 .max_register = 0xffff,
231 static int pmic_spmi_probe(struct spmi_device *sdev)
233 struct regmap *regmap;
234 struct qcom_spmi_dev *ctx;
237 regmap = devm_regmap_init_spmi_ext(sdev, &spmi_regmap_config);
239 return PTR_ERR(regmap);
241 ctx = devm_kzalloc(&sdev->dev, sizeof(*ctx), GFP_KERNEL);
245 ctx->num_usids = (uintptr_t)of_device_get_match_data(&sdev->dev);
247 /* Only the first slave id for a PMIC contains this information */
248 if (sdev->usid % ctx->num_usids == 0) {
249 ret = pmic_spmi_load_revid(regmap, &sdev->dev, &ctx->pmic);
253 spmi_device_set_drvdata(sdev, ctx);
255 return devm_of_platform_populate(&sdev->dev);
258 MODULE_DEVICE_TABLE(of, pmic_spmi_id_table);
260 static struct spmi_driver pmic_spmi_driver = {
261 .probe = pmic_spmi_probe,
264 .of_match_table = pmic_spmi_id_table,
267 module_spmi_driver(pmic_spmi_driver);
269 MODULE_DESCRIPTION("Qualcomm SPMI PMIC driver");
270 MODULE_ALIAS("spmi:spmi-pmic");
271 MODULE_LICENSE("GPL v2");
272 MODULE_AUTHOR("Josh Cartwright <joshc@codeaurora.org>");
273 MODULE_AUTHOR("Stanimir Varbanov <svarbanov@mm-sol.com>");