Date:   Wed, 7 Jun 2017 15:07:33 +0300
From:   Sakari Ailus <sakari.ailus@....fi>
To:     Rajmohan Mani <rajmohan.mani@...el.com>
Cc:     linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org,
        linux-acpi@...r.kernel.org, Lee Jones <lee.jones@...aro.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Alexandre Courbot <gnurou@...il.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>
Subject: Re: [PATCH v1 3/3] ACPI / PMIC: Add TI PMIC TPS68470 operation
 region driver

Hi Rajmohan,

Thanks for removing the redundant struct definition. A couple more comments
below. Not really necessarily bugs but a few things to clean things up a
bit.

On Tue, Jun 06, 2017 at 04:55:18AM -0700, Rajmohan Mani wrote:
> The Kabylake platform coreboot (Chrome OS equivalent of
> BIOS) has defined 4 operation regions for the TI TPS68470 PMIC.
> These operation regions are to enable/disable voltage
> regulators, configure voltage regulators, enable/disable
> clocks and to configure clocks.
> 
> This config adds ACPI operation region support for TI TPS68470 PMIC.
> TPS68470 device is an advanced power management unit that powers
> a Compact Camera Module (CCM), generates clocks for image sensors,
> drives a dual LED for flash and incorporates two LED drivers for
> general purpose indicators.
> This driver enables ACPI operation region support to control voltage
> regulators and clocks for the TPS68470 PMIC.
> 
> Signed-off-by: Rajmohan Mani <rajmohan.mani@...el.com>
> ---
>  drivers/acpi/Kconfig              |  12 +
>  drivers/acpi/Makefile             |   2 +
>  drivers/acpi/pmic/pmic_tps68470.c | 454 ++++++++++++++++++++++++++++++++++++++
>  3 files changed, 468 insertions(+)
>  create mode 100644 drivers/acpi/pmic/pmic_tps68470.c
> 
> diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
> index 1ce52f8..218d22d 100644
> --- a/drivers/acpi/Kconfig
> +++ b/drivers/acpi/Kconfig
> @@ -535,4 +535,16 @@ if ARM64
>  source "drivers/acpi/arm64/Kconfig"
>  endif
>  
> +config TPS68470_PMIC_OPREGION
> +	bool "ACPI operation region support for TPS68470 PMIC"
> +	help
> +	  This config adds ACPI operation region support for TI TPS68470 PMIC.
> +	  TPS68470 device is an advanced power management unit that powers
> +	  a Compact Camera Module (CCM), generates clocks for image sensors,
> +	  drives a dual LED for flash and incorporates two LED drivers for
> +	  general purpose indicators.
> +	  This driver enables ACPI operation region support control voltage
> +	  regulators and clocks.
> +

Extra newline.

> +
>  endif	# ACPI
> diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile
> index b1aacfc..7113d05 100644
> --- a/drivers/acpi/Makefile
> +++ b/drivers/acpi/Makefile
> @@ -106,6 +106,8 @@ obj-$(CONFIG_CHT_WC_PMIC_OPREGION) += pmic/intel_pmic_chtwc.o
>  
>  obj-$(CONFIG_ACPI_CONFIGFS)	+= acpi_configfs.o
>  
> +obj-$(CONFIG_TPS68470_PMIC_OPREGION)	+= pmic/pmic_tps68470.o
> +
>  video-objs			+= acpi_video.o video_detect.o
>  obj-y				+= dptf/
>  
> diff --git a/drivers/acpi/pmic/pmic_tps68470.c b/drivers/acpi/pmic/pmic_tps68470.c
> new file mode 100644
> index 0000000..b2d608b
> --- /dev/null
> +++ b/drivers/acpi/pmic/pmic_tps68470.c
> @@ -0,0 +1,454 @@
> +/*
> + * TI TPS68470 PMIC operation region driver
> + *
> + * Copyright (C) 2017 Intel Corporation. All rights reserved.
> + * Author: Rajmohan Mani <rajmohan.mani@...el.com>
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License 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.
> + *
> + * Based on drivers/acpi/pmic/intel_pmic* drivers
> + *
> + */
> +
> +#include <linux/acpi.h>
> +#include <linux/mfd/tps68470.h>
> +#include <linux/init.h>
> +#include <linux/platform_device.h>
> +#include <linux/regmap.h>
> +
> +struct ti_pmic_table {
> +	u32 address;		/* operation region address */
> +	u32 reg;		/* corresponding register */
> +	u32 bitmask;		/* bit mask for power, clock */
> +};
> +
> +#define TI_PMIC_POWER_OPREGION_ID		0xB0
> +#define TI_PMIC_VR_VAL_OPREGION_ID		0xB1
> +#define TI_PMIC_CLOCK_OPREGION_ID		0xB2
> +#define TI_PMIC_CLKFREQ_OPREGION_ID		0xB3
> +
> +struct ti_pmic_opregion {
> +	struct mutex lock;
> +	struct regmap *regmap;
> +};
> +
> +#define S_IO_I2C_EN	(BIT(0) | BIT(1))
> +
> +static const struct ti_pmic_table power_table[] = {
> +	{
> +		.address = 0x00,
> +		.reg = TPS68470_REG_S_I2C_CTL,
> +		.bitmask = S_IO_I2C_EN,
> +		/* S_I2C_CTL */
> +	},
> +	{
> +		.address = 0x04,
> +		.reg = TPS68470_REG_VCMCTL,
> +		.bitmask = BIT(0),
> +		/* VCMCTL */
> +	},
> +	{
> +		.address = 0x08,
> +		.reg = TPS68470_REG_VAUX1CTL,
> +		.bitmask = BIT(0),
> +		/* VAUX1_CTL */
> +	},
> +	{
> +		.address = 0x0C,
> +		.reg = TPS68470_REG_VAUX2CTL,
> +		.bitmask = BIT(0),
> +		/* VAUX2CTL */
> +	},
> +	{
> +		.address = 0x10,
> +		.reg = TPS68470_REG_VACTL,
> +		.bitmask = BIT(0),
> +		/* VACTL */
> +	},
> +	{
> +		.address = 0x14,
> +		.reg = TPS68470_REG_VDCTL,
> +		.bitmask = BIT(0),
> +		/* VDCTL */
> +	},
> +};
> +
> +/* Table to set voltage regulator value */
> +static const struct ti_pmic_table vr_val_table[] = {
> +	{
> +		.address = 0x00,
> +		.reg = TPS68470_REG_VSIOVAL,
> +		.bitmask = TPS68470_VSIOVAL_IOVOLT_MASK,
> +		/* TPS68470_REG_VSIOVAL */
> +	},
> +	{
> +		.address = 0x04,
> +		.reg = TPS68470_REG_VIOVAL,
> +		.bitmask = TPS68470_VIOVAL_IOVOLT_MASK,
> +		/* TPS68470_REG_VIOVAL */
> +	},
> +	{
> +		.address = 0x08,
> +		.reg = TPS68470_REG_VCMVAL,
> +		.bitmask = TPS68470_VCMVAL_VCVOLT_MASK,
> +		/* TPS68470_REG_VCMVAL */
> +	},
> +	{
> +		.address = 0x0C,
> +		.reg = TPS68470_REG_VAUX1VAL,
> +		.bitmask = TPS68470_VAUX1VAL_AUX1VOLT_MASK,
> +		/* TPS68470_REG_VAUX1VAL */
> +	},
> +	{
> +		.address = 0x10,
> +		.reg = TPS68470_REG_VAUX2VAL,
> +		.bitmask = TPS68470_VAUX2VAL_AUX2VOLT_MASK,
> +		/* TPS68470_REG_VAUX2VAL */
> +	},
> +	{
> +		.address = 0x14,
> +		.reg = TPS68470_REG_VAVAL,
> +		.bitmask = TPS68470_VAVAL_AVOLT_MASK,
> +		/* TPS68470_REG_VAVAL */
> +	},
> +	{
> +		.address = 0x18,
> +		.reg = TPS68470_REG_VDVAL,
> +		.bitmask = TPS68470_VDVAL_DVOLT_MASK,
> +		/* TPS68470_REG_VDVAL */
> +	},
> +};
> +
> +/* Table to configure clock frequency */
> +static const struct ti_pmic_table clk_freq_table[] = {
> +	{
> +		.address = 0x00,
> +		.reg = TPS68470_REG_POSTDIV2,
> +		.bitmask = BIT(0) | BIT(1),
> +		/* TPS68470_REG_POSTDIV2 */
> +	},
> +	{
> +		.address = 0x04,
> +		.reg = TPS68470_REG_BOOSTDIV,
> +		.bitmask = 0x1F,
> +		/* TPS68470_REG_BOOSTDIV */
> +	},
> +	{
> +		.address = 0x08,
> +		.reg = TPS68470_REG_BUCKDIV,
> +		.bitmask = 0x0F,
> +		/* TPS68470_REG_BUCKDIV */
> +	},
> +	{
> +		.address = 0x0C,
> +		.reg = TPS68470_REG_PLLSWR,
> +		.bitmask = 0x13,
> +		/* TPS68470_REG_PLLSWR */
> +	},
> +	{
> +		.address = 0x10,
> +		.reg = TPS68470_REG_XTALDIV,
> +		.bitmask = 0xFF,
> +		/* TPS68470_REG_XTALDIV */
> +	},
> +	{
> +		.address = 0x14,
> +		.reg = TPS68470_REG_PLLDIV,
> +		.bitmask = 0xFF,
> +		/* TPS68470_REG_PLLDIV */
> +	},
> +	{
> +		.address = 0x18,
> +		.reg = TPS68470_REG_POSTDIV,
> +		.bitmask = 0x83,
> +		/* TPS68470_REG_POSTDIV */
> +	},
> +};
> +
> +/* Table to configure and enable clocks */
> +static const struct ti_pmic_table clk_table[] = {
> +	{
> +		.address = 0x00,
> +		.reg = TPS68470_REG_PLLCTL,
> +		.bitmask = 0xF5,
> +		/* TPS68470_REG_PLLCTL */
> +	},
> +	{
> +		.address = 0x04,
> +		.reg = TPS68470_REG_PLLCTL2,
> +		.bitmask = BIT(0),
> +		/* TPS68470_REG_PLLCTL2 */
> +	},
> +	{
> +		.address = 0x08,
> +		.reg = TPS68470_REG_CLKCFG1,
> +		.bitmask = TPS68470_CLKCFG1_MODE_A_MASK |
> +			TPS68470_CLKCFG1_MODE_B_MASK,
> +		/* TPS68470_REG_CLKCFG1 */
> +	},
> +	{
> +		.address = 0x0C,
> +		.reg = TPS68470_REG_CLKCFG2,
> +		.bitmask = TPS68470_CLKCFG1_MODE_A_MASK |
> +			TPS68470_CLKCFG1_MODE_B_MASK,
> +		/* TPS68470_REG_CLKCFG2 */
> +	},
> +};
> +
> +static int pmic_get_reg_bit(u64 address, struct ti_pmic_table *table,
> +			    int count, int *reg, int *bitmask)

unsigned int count?

> +{
> +	u64 i;
> +
> +	i = address / 4;
> +
> +	if (i >= count)
> +		return -ENOENT;
> +
> +	if (!reg || !bitmask)
> +		return -EINVAL;
> +
> +	*reg = table[i].reg;
> +	*bitmask = table[i].bitmask;
> +
> +	return 0;
> +}
> +
> +static int ti_tps68470_pmic_get_power(struct regmap *regmap, int reg,
> +				       int bitmask, u64 *value)
> +{
> +	int data;

Shouldn't you use unsigned int here? Same in the functions below.

> +
> +	if (regmap_read(regmap, reg, &data))
> +		return -EIO;
> +
> +	*value = (data & bitmask) ? 1 : 0;
> +	return 0;
> +}
> +
> +static int ti_tps68470_pmic_get_vr_val(struct regmap *regmap, int reg,
> +				       int bitmask, u64 *value)
> +{
> +	int data;
> +
> +	if (regmap_read(regmap, reg, &data))
> +		return -EIO;
> +
> +	*value = data & bitmask;
> +	return 0;
> +}
> +
> +static int ti_tps68470_pmic_get_clk(struct regmap *regmap, int reg,
> +				       int bitmask, u64 *value)
> +{
> +	int data;
> +
> +	if (regmap_read(regmap, reg, &data))
> +		return -EIO;
> +
> +	*value = (data & bitmask) ? 1 : 0;
> +	return 0;
> +}
> +
> +static int ti_tps68470_pmic_get_clk_freq(struct regmap *regmap, int reg,
> +				       int bitmask, u64 *value)
> +{
> +	int data;
> +
> +	if (regmap_read(regmap, reg, &data))
> +		return -EIO;
> +
> +	*value = data & bitmask;
> +	return 0;
> +}
> +
> +static int ti_tps68470_regmap_update_bits(struct regmap *regmap, int reg,
> +					int bitmask, u64 value)
> +{
> +	return regmap_update_bits(regmap, reg, bitmask, value);
> +}
> +
> +static acpi_status ti_pmic_common_handler(u32 function,
> +					  acpi_physical_address address,
> +					  u32 bits, u64 *value,
> +					  void *handler_context,

handler_context is unused.

> +					  void *region_context,
> +					  int (*get)(struct regmap *,
> +						     int, int, u64 *),
> +					  int (*update)(struct regmap *,
> +							int, int, u64),
> +					  struct ti_pmic_table *table,
> +					  int table_size)

unsigned int. (Or size_t or whatever.)

> +{
> +	struct ti_pmic_opregion *opregion = region_context;
> +	struct regmap *regmap = opregion->regmap;
> +	int reg, ret, bitmask;
> +
> +	if (bits != 32)
> +		return AE_BAD_PARAMETER;
> +
> +	ret = pmic_get_reg_bit(address, table,
> +				  table_size, &reg, &bitmask);
> +	if (ret < 0)
> +		return AE_BAD_PARAMETER;
> +
> +	if (function == ACPI_WRITE && (*value > bitmask))

Extra parentheses.

> +		return AE_BAD_PARAMETER;
> +
> +	mutex_lock(&opregion->lock);
> +
> +	ret = (function == ACPI_READ) ?
> +		get(regmap, reg, bitmask, value) :
> +		update(regmap, reg, bitmask, *value);
> +
> +	mutex_unlock(&opregion->lock);
> +
> +	return ret ? AE_ERROR : AE_OK;
> +}
> +
> +static acpi_status ti_pmic_clk_freq_handler(u32 function,
> +					    acpi_physical_address address,
> +					    u32 bits, u64 *value,
> +					    void *handler_context,
> +					    void *region_context)
> +{
> +	return ti_pmic_common_handler(function, address, bits, value,
> +				handler_context, region_context,
> +				ti_tps68470_pmic_get_clk_freq,
> +				ti_tps68470_regmap_update_bits,
> +				(struct ti_pmic_table *) &clk_freq_table,

You shouldn't use an explicit cast here. Instead make the function argument
const as well and you're fine.

> +				ARRAY_SIZE(clk_freq_table));
> +}
> +
> +static acpi_status ti_pmic_clk_handler(u32 function,
> +				       acpi_physical_address address, u32 bits,
> +				       u64 *value, void *handler_context,
> +				       void *region_context)
> +{
> +	return ti_pmic_common_handler(function, address, bits, value,
> +				handler_context, region_context,
> +				ti_tps68470_pmic_get_clk,
> +				ti_tps68470_regmap_update_bits,
> +				(struct ti_pmic_table *) &clk_table,
> +				 ARRAY_SIZE(clk_table));
> +}
> +
> +static acpi_status ti_pmic_vr_val_handler(u32 function,
> +					  acpi_physical_address address,
> +					  u32 bits, u64 *value,
> +					  void *handler_context,
> +					  void *region_context)
> +{
> +	return ti_pmic_common_handler(function, address, bits, value,
> +				handler_context, region_context,
> +				ti_tps68470_pmic_get_vr_val,
> +				ti_tps68470_regmap_update_bits,
> +				(struct ti_pmic_table *) &vr_val_table,
> +				ARRAY_SIZE(vr_val_table));
> +}
> +
> +static acpi_status ti_pmic_power_handler(u32 function,
> +					 acpi_physical_address address,
> +					 u32 bits, u64 *value,
> +					 void *handler_context,
> +					 void *region_context)
> +{
> +	if (bits != 32)
> +		return AE_BAD_PARAMETER;
> +
> +	/* set/clear for bit 0, bits 0 and 1 together */
> +	if (function == ACPI_WRITE &&
> +	    !(*value == 0 || *value == 1 || *value == 3)) {
> +		return AE_BAD_PARAMETER;
> +	}
> +
> +	return ti_pmic_common_handler(function, address, bits, value,
> +				handler_context, region_context,
> +				ti_tps68470_pmic_get_power,
> +				ti_tps68470_regmap_update_bits,
> +				(struct ti_pmic_table *) &power_table,
> +				ARRAY_SIZE(power_table));
> +}
> +
> +static int ti_tps68470_pmic_opregion_probe(struct platform_device *pdev)
> +{
> +	struct tps68470 *pmic = dev_get_drvdata(pdev->dev.parent);
> +	acpi_handle handle = ACPI_HANDLE(pdev->dev.parent);
> +	struct device *dev = &pdev->dev;
> +	struct ti_pmic_opregion *opregion;
> +	acpi_status status;
> +
> +	if (!dev || !pmic->regmap) {
> +		WARN(1, "dev or regmap is NULL\n");
> +		return -EINVAL;
> +	}
> +
> +	if (!handle) {
> +		WARN(1, "acpi handle is NULL\n");
> +		return -ENODEV;
> +	}
> +
> +	opregion = devm_kzalloc(dev, sizeof(*opregion), GFP_KERNEL);
> +	if (!opregion)
> +		return -ENOMEM;
> +
> +	mutex_init(&opregion->lock);
> +	opregion->regmap = pmic->regmap;
> +
> +	status = acpi_install_address_space_handler(handle,
> +						    TI_PMIC_POWER_OPREGION_ID,
> +						    ti_pmic_power_handler,
> +						    NULL, opregion);
> +	if (ACPI_FAILURE(status))

mutex_destroy() after mutex_init() --- please add a label for this.

> +		return -ENODEV;
> +
> +	status = acpi_install_address_space_handler(handle,
> +						    TI_PMIC_VR_VAL_OPREGION_ID,
> +						    ti_pmic_vr_val_handler,
> +						    NULL, opregion);
> +	if (ACPI_FAILURE(status))
> +		goto out_remove_power_handler;
> +
> +	status = acpi_install_address_space_handler(handle,
> +						    TI_PMIC_CLOCK_OPREGION_ID,
> +						    ti_pmic_clk_handler,
> +						    NULL, opregion);
> +	if (ACPI_FAILURE(status))
> +		goto out_remove_vr_val_handler;
> +
> +	status = acpi_install_address_space_handler(handle,
> +						    TI_PMIC_CLKFREQ_OPREGION_ID,
> +						    ti_pmic_clk_freq_handler,
> +						    NULL, opregion);
> +	if (ACPI_FAILURE(status))
> +		goto out_remove_clk_handler;
> +
> +	return 0;
> +
> +out_remove_clk_handler:
> +	acpi_remove_address_space_handler(handle, TI_PMIC_CLOCK_OPREGION_ID,
> +					  ti_pmic_clk_handler);
> +out_remove_vr_val_handler:
> +	acpi_remove_address_space_handler(handle, TI_PMIC_VR_VAL_OPREGION_ID,
> +					  ti_pmic_vr_val_handler);
> +out_remove_power_handler:
> +	acpi_remove_address_space_handler(handle, TI_PMIC_POWER_OPREGION_ID,
> +					  ti_pmic_power_handler);
> +	return -ENODEV;
> +}
> +
> +static struct platform_driver ti_tps68470_pmic_opregion_driver = {
> +	.probe = ti_tps68470_pmic_opregion_probe,
> +	.driver = {
> +		.name = "tps68470_pmic_opregion",
> +	},
> +};
> +
> +builtin_platform_driver(ti_tps68470_pmic_opregion_driver)

-- 
Kind regards,

Sakari Ailus
e-mail: sakari.ailus@....fi	XMPP: sailus@...iisi.org.uk

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