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Message-ID: <20120308141847.GG27213@game.jcrosoft.org>
Date: Thu, 8 Mar 2012 15:18:47 +0100
From: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>
To: "Ying-Chun Liu (PaulLiu)" <paul.liu@...aro.org>
Cc: linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
linaro-dev@...ts.linaro.org, patches@...aro.org,
Nancy Chen <Nancy.Chen@...escale.com>,
Mark Brown <broonie@...nsource.wolfsonmicro.com>,
Liam Girdwood <lrg@...com>,
Samuel Ortiz <sameo@...ux.intel.com>,
Axel Lin <axel.lin@...il.com>
Subject: Re: [PATCH v10] Regulator: Add Anatop regulator driver
On 17:59 Thu 08 Mar , Ying-Chun Liu (PaulLiu) wrote:
> From: "Ying-Chun Liu (PaulLiu)" <paul.liu@...aro.org>
>
> Anatop is an integrated regulator inside i.MX6 SoC.
> There are 3 digital regulators which controls PU, CORE (ARM), and SOC.
> And 3 analog regulators which controls 1P1, 2P5, 3P0 (USB).
> This patch adds the Anatop regulator driver.
>
> Signed-off-by: Nancy Chen <Nancy.Chen@...escale.com>
> Signed-off-by: Ying-Chun Liu (PaulLiu) <paul.liu@...aro.org>
> Acked-by: Shawn Guo <shawn.guo@...aro.org>
> Cc: Mark Brown <broonie@...nsource.wolfsonmicro.com>
> Cc: Liam Girdwood <lrg@...com>
> Cc: Samuel Ortiz <sameo@...ux.intel.com>
> Cc: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>
> Cc: Axel Lin <axel.lin@...il.com>
> ---
> .../bindings/regulator/anatop-regulator.txt | 28 +++
> drivers/regulator/Kconfig | 8 +
> drivers/regulator/Makefile | 1 +
> drivers/regulator/anatop-regulator.c | 236 ++++++++++++++++++++
> 4 files changed, 273 insertions(+), 0 deletions(-)
> create mode 100644 Documentation/devicetree/bindings/regulator/anatop-regulator.txt
> create mode 100644 drivers/regulator/anatop-regulator.c
>
> diff --git a/Documentation/devicetree/bindings/regulator/anatop-regulator.txt b/Documentation/devicetree/bindings/regulator/anatop-regulator.txt
> new file mode 100644
> index 0000000..73363e76
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/regulator/anatop-regulator.txt
> @@ -0,0 +1,28 @@
> +Anatop Voltage regulators
> +
> +Required properties:
> +- compatible: Must be "fsl,anatop-regulator"
> +- anatop-vol-bit-shift: Bit shift for the register
> +- anatop-vol-bit-width: Number of bits used in the register
> +- anatop-min-bit-val: Minimum value of this register
> +- anatop-min-voltage: Minimum voltage of this regulator
> +- anatop-max-voltage: Maximum voltage of this regulator
> +
> +Any property defined as part of the core regulator
> +binding, defined in regulator.txt, can also be used.
> +
> +Example:
> +
> + reg_vddpu: regulator-vddpu@140 {
> + compatible = "fsl,anatop-regulator";
> + regulator-name = "vddpu";
> + regulator-min-microvolt = <725000>;
> + regulator-max-microvolt = <1300000>;
> + regulator-always-on;
> + reg = <0x140>;
> + anatop-vol-bit-shift = <9>;
> + anatop-vol-bit-width = <5>;
> + anatop-min-bit-val = <1>;
> + anatop-min-voltage = <725000>;
> + anatop-max-voltage = <1300000>;
> + };
> diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
> index 7a61b17..3857209 100644
> --- a/drivers/regulator/Kconfig
> +++ b/drivers/regulator/Kconfig
> @@ -213,6 +213,14 @@ config REGULATOR_PCAP
> This driver provides support for the voltage regulators of the
> PCAP2 PMIC.
>
> +config REGULATOR_ANATOP
> + tristate "Freescale i.MX on-chip ANATOP LDO regulators"
> + depends on MFD_ANATOP
> + help
> + Say y here to support Freescale i.MX on-chip ANATOP LDOs
> + regulators. It is recommended that this option be
> + enabled on i.MX6 platform.
> +
> config REGULATOR_MC13XXX_CORE
> tristate
>
> diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
> index 503bac8..8440871 100644
> --- a/drivers/regulator/Makefile
> +++ b/drivers/regulator/Makefile
> @@ -48,5 +48,6 @@ obj-$(CONFIG_REGULATOR_AB8500) += ab8500.o
> obj-$(CONFIG_REGULATOR_DB8500_PRCMU) += db8500-prcmu.o
> obj-$(CONFIG_REGULATOR_TPS65910) += tps65910-regulator.o
> obj-$(CONFIG_REGULATOR_AAT2870) += aat2870-regulator.o
> +obj-$(CONFIG_REGULATOR_ANATOP) += anatop-regulator.o
>
> ccflags-$(CONFIG_REGULATOR_DEBUG) += -DDEBUG
> diff --git a/drivers/regulator/anatop-regulator.c b/drivers/regulator/anatop-regulator.c
> new file mode 100644
> index 0000000..133a17b
> --- /dev/null
> +++ b/drivers/regulator/anatop-regulator.c
> @@ -0,0 +1,236 @@
> +/*
> + * Copyright (C) 2011 Freescale Semiconductor, Inc. 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 as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> +
> + * 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.
> +
> + * You should have received a copy of the GNU General Public License along
> + * with this program; if not, write to the Free Software Foundation, Inc.,
> + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
> + */
> +
> +#include <linux/slab.h>
> +#include <linux/device.h>
> +#include <linux/module.h>
> +#include <linux/err.h>
> +#include <linux/io.h>
> +#include <linux/platform_device.h>
> +#include <linux/of.h>
> +#include <linux/of_address.h>
> +#include <linux/mfd/anatop.h>
> +#include <linux/regulator/driver.h>
> +#include <linux/regulator/of_regulator.h>
> +
> +struct anatop_regulator {
> + const char *name;
> + u32 control_reg;
> + struct anatop *mfd;
> + int vol_bit_shift;
> + int vol_bit_width;
> + int min_bit_val;
> + int min_voltage;
> + int max_voltage;
> + struct regulator_desc rdesc;
> + struct regulator_init_data *initdata;
> +};
> +
> +static int anatop_set_voltage(struct regulator_dev *reg, int min_uV,
> + int max_uV, unsigned *selector)
> +{
> + struct anatop_regulator *anatop_reg = rdev_get_drvdata(reg);
> + u32 val, sel;
> + int uv;
> +
> + uv = min_uV;
> + dev_dbg(®->dev, "%s: uv %d, min %d, max %d\n", __func__,
> + uv, anatop_reg->min_voltage,
> + anatop_reg->max_voltage);
> +
> + if (uv < anatop_reg->min_voltage) {
> + if (max_uV > anatop_reg->min_voltage)
> + uv = anatop_reg->min_voltage;
> + else
> + return -EINVAL;
> + }
> +
> + if (anatop_reg->control_reg) {
> + sel = (uv - anatop_reg->min_voltage) / 25000;
> + if (sel * 25000 + anatop_reg->min_voltage
> + > anatop_reg->max_voltage)
> + return -EINVAL;
> + val = anatop_reg->min_bit_val + sel;
> + *selector = sel;
> + dev_dbg(®->dev, "%s: calculated val %d\n", __func__, val);
> + anatop_set_bits(anatop_reg->mfd,
> + anatop_reg->control_reg,
> + anatop_reg->vol_bit_shift,
> + anatop_reg->vol_bit_width,
> + val);
> + return 0;
> + } else {
> + return -ENOTSUPP;
> + }
invert the test to make the code more readable
> +}
> +
> +static int anatop_get_voltage_sel(struct regulator_dev *reg)
> +{
> + struct anatop_regulator *anatop_reg = rdev_get_drvdata(reg);
> + int selector;
> +
> + if (anatop_reg->control_reg) {
> + u32 val = anatop_get_bits(anatop_reg->mfd,
> + anatop_reg->control_reg,
> + anatop_reg->vol_bit_shift,
> + anatop_reg->vol_bit_width);
> + selector = val - anatop_reg->min_bit_val;
> + return selector;
why do you need selector
> + } else {
> + return -ENOTSUPP;
> + }
invert the test to make the code more readable
> +}
> +
> +static int anatop_list_voltage(struct regulator_dev *reg, unsigned selector)
> +{
> + struct anatop_regulator *anatop_reg = rdev_get_drvdata(reg);
> + int uv;
> +
> + uv = anatop_reg->min_voltage + selector * 25000;
> + dev_dbg(®->dev, "vddio = %d, selector = %u\n", uv, selector);
> +
> + return uv;
> +}
> +
> +static struct regulator_ops anatop_rops = {
> + .set_voltage = anatop_set_voltage,
> + .get_voltage_sel = anatop_get_voltage_sel,
> + .list_voltage = anatop_list_voltage,
> +};
> +
> +static int __devinit anatop_regulator_probe(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
you set a dev var but use &pdev->dev most of the time
> + struct device_node *np = dev->of_node;
> + struct regulator_desc *rdesc;
> + struct regulator_dev *rdev;
> + struct anatop_regulator *sreg;
> + struct regulator_init_data *initdata;
> + struct anatop *anatopmfd = dev_get_drvdata(pdev->dev.parent);
> + int ret = 0;
> +
> + initdata = of_get_regulator_init_data(dev, np);
> + sreg = devm_kzalloc(dev, sizeof(*sreg), GFP_KERNEL);
> + if (!sreg)
> + return -ENOMEM;
> + sreg->initdata = initdata;
> + sreg->name = kstrdup(of_get_property(np, "regulator-name", NULL),
> + GFP_KERNEL);
> + rdesc = &sreg->rdesc;
> + memset(rdesc, 0, sizeof(*rdesc));
> + rdesc->name = sreg->name;
> + rdesc->ops = &anatop_rops;
> + rdesc->type = REGULATOR_VOLTAGE;
> + rdesc->owner = THIS_MODULE;
> + sreg->mfd = anatopmfd;
> + if (of_property_read_u32(np, "reg", &sreg->control_reg)) {
> + dev_err(&pdev->dev, "no reg property set\n");
> + ret = -ENODEV;
why not return the err return by the read_u32 or atleast print it
> + goto anatop_probe_end;
> + }
> + if (of_property_read_u32(np, "anatop-vol-bit-width",
> + &sreg->vol_bit_width)) {
> + dev_err(&pdev->dev, "no anatop-vol-bit-width property set\n");
> + ret = -ENODEV;
> + goto anatop_probe_end;
> + }
> + if (of_property_read_u32(np, "anatop-vol-bit-shift",
> + &sreg->vol_bit_shift)) {
> + dev_err(&pdev->dev, "no anatop-vol-bit-shift property set\n");
> + ret = -ENODEV;
> + goto anatop_probe_end;
> + }
> + if (of_property_read_u32(np, "anatop-min-bit-val",
> + &sreg->min_bit_val)) {
> + dev_err(&pdev->dev, "no anatop-min-bit-val property set\n");
> + ret = -ENODEV;
> + goto anatop_probe_end;
> + }
> + if (of_property_read_u32(np, "anatop-min-voltage",
> + &sreg->min_voltage)) {
> + dev_err(&pdev->dev, "no anatop-min-voltage property set\n");
> + ret = -ENODEV;
> + goto anatop_probe_end;
> + }
> + if (of_property_read_u32(np, "anatop-max-voltage",
> + &sreg->max_voltage)) {
> + dev_err(&pdev->dev, "no anatop-max-voltage property set\n");
> + ret = -ENODEV;
> + goto anatop_probe_end;
> + }
> +
> + /* register regulator */
> + rdev = regulator_register(rdesc, &pdev->dev,
> + initdata, sreg, pdev->dev.of_node);
> + if (IS_ERR(rdev)) {
> + dev_err(&pdev->dev, "failed to register %s\n",
> + rdesc->name);
> + ret = PTR_ERR(rdev);
> + goto anatop_probe_end;
> + }
> +
> + platform_set_drvdata(pdev, rdev);
> +
> +anatop_probe_end:
> + if (ret != 0 && sreg->name)
> + kfree(sreg->name);
kfree can be called with a NULL pointer
> + return ret;
> +}
> +
> +static int __devexit anatop_regulator_remove(struct platform_device *pdev)
> +{
> + struct regulator_dev *rdev = platform_get_drvdata(pdev);
> + struct anatop_regulator *sreg = rdev_get_drvdata(rdev);
> + kfree(sreg->name);
> + regulator_unregister(rdev);
return from the unregister
> + return 0;
> +}
Best Regards,
J.
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