linux-kernel - [PATCH 1/2] mfd: pm8x41: add support for Qualcomm 8x41 PMICs

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Date:	Tue, 22 Apr 2014 17:31:49 -0700
From:	Courtney Cavin <courtney.cavin@...ymobile.com>
To:	Samuel Ortiz <sameo@...ux.intel.com>,
	Lee Jones <lee.jones@...aro.org>
CC:	Josh Cartwright <joshc@...eaurora.org>,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	<linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
	<linux-arm-msm@...r.kernel.org>
Subject: [PATCH 1/2] mfd: pm8x41: add support for Qualcomm 8x41 PMICs

From: Josh Cartwright <joshc@...eaurora.org>

The Qualcomm 8941 and 8841 PMICs 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: Josh Cartwright <joshc@...eaurora.org>
Signed-off-by: Courtney Cavin <courtney.cavin@...ymobile.com>
---
 drivers/mfd/Kconfig  | 13 +++++++++++
 drivers/mfd/Makefile |  1 +
 drivers/mfd/pm8x41.c | 63 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 77 insertions(+)
 create mode 100644 drivers/mfd/pm8x41.c

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 3383412..f5ff799 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -502,6 +502,19 @@ 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_PM8X41
+	bool "Qualcomm PM8x41 PMIC"
+	depends on ARCH_QCOM
+	select REGMAP_SPMI
+	help
+	  This enables basic support for the Qualcomm 8941 and 8841 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 PM8x41 series as a
+	  module.  The module will be called "pm8x41".
+
 config MFD_RDC321X
 	tristate "RDC R-321x southbridge"
 	select MFD_CORE
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 2851275..f0df41d 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -151,6 +151,7 @@ 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-$(CONFIG_MFD_PM8X41)	+= pm8x41.o
 obj-$(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/pm8x41.c b/drivers/mfd/pm8x41.c
new file mode 100644
index 0000000..c85e0d6
--- /dev/null
+++ b/drivers/mfd/pm8x41.c
@@ -0,0 +1,63 @@
+/* Copyright (c) 2013, 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_platform.h>
+
+static const struct regmap_config pm8x41_regmap_config = {
+	.reg_bits	= 16,
+	.val_bits	= 8,
+	.max_register	= 0xFFFF,
+};
+
+static int pm8x41_remove_child(struct device *dev, void *unused)
+{
+	platform_device_unregister(to_platform_device(dev));
+	return 0;
+}
+
+static void pm8x41_remove(struct spmi_device *sdev)
+{
+	device_for_each_child(&sdev->dev, NULL, pm8x41_remove_child);
+}
+
+static int pm8x41_probe(struct spmi_device *sdev)
+{
+	struct regmap *regmap;
+
+	regmap = devm_regmap_init_spmi_ext(sdev, &pm8x41_regmap_config);
+	if (IS_ERR(regmap)) {
+		dev_dbg(&sdev->dev, "regmap creation failed.\n");
+		return PTR_ERR(regmap);
+	}
+
+	return of_platform_populate(sdev->dev.of_node, NULL, NULL, &sdev->dev);
+}
+
+static const struct of_device_id pm8x41_id_table[] = {
+	{ .compatible = "qcom,pm8841", },
+	{ .compatible = "qcom,pm8941", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, pm8x41_id_table);
+
+static struct spmi_driver pm8x41_driver = {
+	.probe	= pm8x41_probe,
+	.remove	= pm8x41_remove,
+	.driver	= {
+		.name		= "pm8x41",
+		.of_match_table	= pm8x41_id_table,
+	},
+};
+module_spmi_driver(pm8x41_driver);
-- 
1.8.1.5

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