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Date:	Mon, 14 Jul 2014 15:21:00 +0530
From:	pramod gurav <pramod.gurav.etc@...il.com>
To:	Stanimir Varbanov <svarbanov@...sol.com>
Cc:	linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
	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>
Subject: Re: [PATCH 1/3] mfd: qpnp-spmi: add support for Qualcomm QPNP PMICs

On Tue, Jul 8, 2014 at 9:24 PM, Stanimir Varbanov <svarbanov@...sol.com> wrote:
> 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", },
Looks like a extra comma here before closing curly bracket.

> +       { },
> +};
> +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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-- 
Thanks and Regards
Pramod
--
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