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Message-Id: <1404834869-23049-2-git-send-email-svarbanov@mm-sol.com>
Date: Tue, 8 Jul 2014 18:54:27 +0300
From: Stanimir Varbanov <svarbanov@...sol.com>
To: linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org
Cc: Rob Herring <robh+dt@...nel.org>,
Kumar Gala <galak@...eaurora.org>,
Mark Rutland <mark.rutland@....com>,
Grant Likely <grant.likely@...aro.org>,
Courtney Cavin <courtney.cavin@...ymobile.com>,
Lee Jones <lee.jones@...aro.org>,
Samuel Ortiz <sameo@...ux.intel.com>,
Josh Cartwright <joshc@...eaurora.org>,
Stanimir Varbanov <svarbanov@...sol.com>
Subject: [PATCH 1/3] mfd: qpnp-spmi: add support for Qualcomm QPNP PMICs
From: Josh Cartwright <joshc@...eaurora.org>
The Qualcomm QPNP PMIC chips are components used with the
Snapdragon 800 series SoC family. This driver exists
largely as a glue mfd component, it exists to be an owner
of an SPMI regmap for children devices described in
device tree.
Signed-off-by: Stanimir Varbanov <svarbanov@...sol.com>
---
drivers/mfd/Kconfig | 15 +++++
drivers/mfd/Makefile | 1 +
drivers/mfd/qpnp-spmi.c | 145 +++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 161 insertions(+), 0 deletions(-)
create mode 100644 drivers/mfd/qpnp-spmi.c
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index ee8204c..258b733 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -524,6 +524,21 @@ config MFD_PM8921_CORE
Say M here if you want to include support for PM8921 chip as a module.
This will build a module called "pm8921-core".
+config MFD_QPNP_SPMI
+ tristate "Qualcomm QPNP SPMI PMIC"
+ depends on ARCH_QCOM || COMPILE_TEST
+ depends on OF
+ select MFD_CORE
+ select REGMAP_SPMI
+ help
+ This enables support for the Qualcomm QPNP SPMI PMICs.
+ These PMICs are currently used with the Snapdragon 800 series of
+ SoCs. Note, that this will only be useful paired with descriptions
+ of the independent functions as children nodes in the device tree.
+
+ Say M here if you want to include support for the QPNP SPMI PMIC
+ series as a module. The module will be called "qpnp-spmi".
+
config MFD_RDC321X
tristate "RDC R-321x southbridge"
select MFD_CORE
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 8afedba..31833d7 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -153,6 +153,7 @@ obj-$(CONFIG_MFD_SI476X_CORE) += si476x-core.o
obj-$(CONFIG_MFD_CS5535) += cs5535-mfd.o
obj-$(CONFIG_MFD_OMAP_USB_HOST) += omap-usb-host.o omap-usb-tll.o
obj-$(CONFIG_MFD_PM8921_CORE) += pm8921-core.o ssbi.o
+obj-$(CONFIG_MFD_QPNP_SPMI) += qpnp-spmi.o
obj-$(CONFIG_TPS65911_COMPARATOR) += tps65911-comparator.o
obj-$(CONFIG_MFD_TPS65090) += tps65090.o
obj-$(CONFIG_MFD_AAT2870_CORE) += aat2870-core.o
diff --git a/drivers/mfd/qpnp-spmi.c b/drivers/mfd/qpnp-spmi.c
new file mode 100644
index 0000000..01eac64
--- /dev/null
+++ b/drivers/mfd/qpnp-spmi.c
@@ -0,0 +1,145 @@
+/* Copyright (c) 2014, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/spmi.h>
+#include <linux/regmap.h>
+#include <linux/of_address.h>
+#include <linux/slab.h>
+#include <linux/mfd/core.h>
+
+#define QPNP_RESOURCE_SIZE 256
+
+static const struct regmap_config qpnp_regmap_config = {
+ .reg_bits = 16,
+ .val_bits = 8,
+ .max_register = 0xffff,
+};
+
+static int qpnp_index_to_resource(struct device_node *np, int index,
+ struct resource *res)
+{
+ const char *name = NULL;
+ const __be32 *addrp;
+ u64 addr;
+
+ addrp = of_get_address(np, index, NULL, NULL);
+ if (!addrp)
+ return -EINVAL;
+
+ addr = of_read_number(addrp, 1);
+ if (addr == OF_BAD_ADDR)
+ return -EINVAL;
+
+ of_property_read_string_index(np, "reg-names", index, &name);
+
+ res->start = addr;
+ res->end = addr + QPNP_RESOURCE_SIZE - 1;
+ res->flags = IORESOURCE_REG;
+ res->name = name ? name : np->name;
+
+ return 0;
+}
+
+static int qpnp_add_device(struct spmi_device *root, struct device_node *child)
+{
+ struct mfd_cell cell = {};
+ struct resource *res, *r;
+ int num_resources = 0;
+ const char *compat;
+ int ret, i;
+
+ compat = of_get_property(child, "compatible", NULL);
+ if (!compat)
+ return -ENODEV;
+
+ while (of_get_address(child, num_resources, NULL, NULL))
+ num_resources++;
+
+ if (!num_resources)
+ return -ENODEV;
+
+ res = kcalloc(num_resources, sizeof(*res), GFP_KERNEL);
+ if (!res)
+ return -ENOMEM;
+
+ r = res;
+ for (i = 0; i < num_resources; i++, r++) {
+ ret = qpnp_index_to_resource(child, i, r);
+ if (ret)
+ goto out;
+ }
+
+ cell.of_compatible = compat;
+ cell.num_resources = num_resources;
+ cell.resources = res;
+ cell.name = kasprintf(GFP_KERNEL, "%x.%04x.%s", root->usid,
+ (u16)res[0].start, child->name);
+ if (!cell.name) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ ret = mfd_add_devices(&root->dev, PLATFORM_DEVID_NONE, &cell, 1, NULL,
+ 0, NULL);
+
+ kfree(cell.name);
+out:
+ kfree(res);
+ return ret;
+}
+
+static int qpnp_probe(struct spmi_device *sdev)
+{
+ struct device_node *root = sdev->dev.of_node;
+ struct device_node *child;
+ struct regmap *regmap;
+ int ret;
+
+ regmap = devm_regmap_init_spmi_ext(sdev, &qpnp_regmap_config);
+ if (IS_ERR(regmap))
+ return PTR_ERR(regmap);
+
+ for_each_available_child_of_node(root, child) {
+ ret = qpnp_add_device(sdev, child);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
+static void qpnp_remove(struct spmi_device *sdev)
+{
+ mfd_remove_devices(&sdev->dev);
+}
+
+static const struct of_device_id qpnp_id_table[] = {
+ { .compatible = "qcom,qpnp-spmi", },
+ { },
+};
+MODULE_DEVICE_TABLE(of, qpnp_id_table);
+
+static struct spmi_driver qpnp_driver = {
+ .probe = qpnp_probe,
+ .remove = qpnp_remove,
+ .driver = {
+ .name = "qpnp-spmi",
+ .of_match_table = qpnp_id_table,
+ },
+};
+module_spmi_driver(qpnp_driver);
+
+MODULE_DESCRIPTION("QPNP PMIC SPMI driver");
+MODULE_ALIAS("platform:" KBUILD_MODNAME);
+MODULE_AUTHOR("The Linux Foundation");
+MODULE_LICENSE("GPL v2");
--
1.7.0.4
--
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