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Date: Wed, 23 Apr 2014 10:38:10 -0700
From: Courtney Cavin <courtney.cavin@...ymobile.com>
To: Lee Jones <lee.jones@...aro.org>
CC: Samuel Ortiz <sameo@...ux.intel.com>,
Josh Cartwright <joshc@...eaurora.org>,
Grant Likely <grant.likely@...aro.org>,
Rob Herring <robh+dt@...nel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
"linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>
Subject: Re: [PATCH 1/2] mfd: pm8x41: add support for Qualcomm 8x41 PMICs
On Wed, Apr 23, 2014 at 12:50:55PM +0200, Lee Jones wrote:
> > 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"
Hrm. This should be tristate.
> > + depends on ARCH_QCOM
>
> depends on OF?
Yea, that's probably best.
> > + 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,
>
> I've never seen this many registers registered before.
>
> Are you sure you want to regmap the entire bank?
>
Quite sure. The pm8941 has blocks at each 0x100, up to 0xE700.
Additionally, from what I've heard, there are some undocumented (for me
at least) blocks higher than that.
> > +};
> > +
> > +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);
> > +}
>
> Nit: It's strange to see the .remove above the .probe.
>
Really? Alright, I can move it.
> > +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");
>
> This is not debug, it's an error.
>
Indeed.
> > + 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,
>
> of_match_ptr()
>
Ok.
> > + },
> > +};
> > +module_spmi_driver(pm8x41_driver);
Thanks for the review.
-Courtney
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