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Date: Fri, 5 Aug 2016 09:03:22 +0100
From: Lee Jones <lee.jones@...aro.org>
To: Keerthy <j-keerthy@...com>
Cc: linus.walleij@...aro.org, gnurou@...il.com,
linux-omap@...r.kernel.org, linux-kernel@...r.kernel.org,
devicetree@...r.kernel.org, linux-gpio@...r.kernel.org,
broonie@...nel.org, robh+dt@...nel.org, tony@...mide.com
Subject: Re: [PATCH v5 2/3] mfd: lp873x: Add lp873x PMIC support
On Wed, 29 Jun 2016, Keerthy wrote:
> The LP873X chip is a power management IC for Portable Navigation Systems
> and Tablet Computing devices. It contains the following components:
>
> - Regulators.
> - Configurable General Purpose Output Signals(GPO).
>
> PMIC interacts with the main processor through i2c. PMIC has
> couple of LDOs(Linear Regulators), couple of BUCKs (Step-Down DC-DC
> Converter Cores) and GPOs(General Purpose Output Signals).
>
> Signed-off-by: Keerthy <j-keerthy@...com>
> ---
>
> Changes in v4:
>
> * Added Author.
> * Added the mfd_cell for gpio.
>
> Changes in v3:
>
> * Reordered the probe code.
> * Fixed Typo in Kconfig description.
> * Removed unused member from struct lp873x.
>
> drivers/mfd/Kconfig | 14 +++
> drivers/mfd/Makefile | 2 +
> drivers/mfd/lp873x.c | 99 +++++++++++++++++
> include/linux/mfd/lp873x.h | 264 +++++++++++++++++++++++++++++++++++++++++++++
> 4 files changed, 379 insertions(+)
> create mode 100644 drivers/mfd/lp873x.c
> create mode 100644 include/linux/mfd/lp873x.h
>
> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> index 9987d86..e68ac28 100644
> --- a/drivers/mfd/Kconfig
> +++ b/drivers/mfd/Kconfig
> @@ -1221,6 +1221,20 @@ config MFD_TPS65217
> This driver can also be built as a module. If so, the module
> will be called tps65217.
>
> +config MFD_LP873X
Nicer as MFD_TI_LP873X I think.
> + tristate "TI LP873X Power Management IC"
> + depends on I2C
> + select MFD_CORE
> + select REGMAP_I2C
> + help
> + If you say yes here then you get support for the LP873X series of
> + power management integrated circuits(PMIC).
Power Management Integrated Circuits (PMIC).
> + These include voltage regulators, Thermal protection, Configurable
> + general purpose outputs(GPO) that are used in portable devices.
Some here. Please standardise your capitalisation.
> + This driver can also be built as a module. If so, the module
> + will be called lp873x.
> +
> config MFD_TPS65218
> tristate "TI TPS65218 Power Management chips"
> depends on I2C
> diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
> index 2ba3ba3..7d9b965 100644
> --- a/drivers/mfd/Makefile
> +++ b/drivers/mfd/Makefile
> @@ -22,6 +22,8 @@ obj-$(CONFIG_HTC_EGPIO) += htc-egpio.o
> obj-$(CONFIG_HTC_PASIC3) += htc-pasic3.o
> obj-$(CONFIG_HTC_I2CPLD) += htc-i2cpld.o
>
> +obj-$(CONFIG_MFD_LP873X) += lp873x.o
> +
> obj-$(CONFIG_MFD_DAVINCI_VOICECODEC) += davinci_voicecodec.o
> obj-$(CONFIG_MFD_DM355EVM_MSP) += dm355evm_msp.o
> obj-$(CONFIG_MFD_TI_AM335X_TSCADC) += ti_am335x_tscadc.o
> diff --git a/drivers/mfd/lp873x.c b/drivers/mfd/lp873x.c
> new file mode 100644
> index 0000000..54ed0ce
> --- /dev/null
> +++ b/drivers/mfd/lp873x.c
> @@ -0,0 +1,99 @@
> +/*
> + * Copyright (C) 2016 Texas Instruments Incorporated - http://www.ti.com/
> + *
> + * Author: Keerthy <j-keerthy@...com>
> + *
> + * 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 version 2.
> + *
> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
> + * kind, whether express or implied; without even the implied warranty
> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <linux/interrupt.h>
> +#include <linux/mfd/core.h>
> +#include <linux/module.h>
> +#include <linux/of_device.h>
> +#include <linux/regmap.h>
> +
> +#include <linux/mfd/lp873x.h>
> +
> +static const struct regmap_config lp873x_regmap_config = {
> + .reg_bits = 8,
> + .val_bits = 8,
> + .max_register = LP873X_REG_MAX,
> +};
> +
> +static const struct mfd_cell lp873x_cells[] = {
> + { .name = "lp873x-regulator", },
> + { .name = "lp873x-gpio", },
> +};
> +
> +static int lp873x_probe(struct i2c_client *client,
> + const struct i2c_device_id *ids)
> +{
> + struct lp873x *lp873;
> + int ret;
> + unsigned int otpid;
> +
> + lp873 = devm_kzalloc(&client->dev, sizeof(*lp873), GFP_KERNEL);
> + if (!lp873)
> + return -ENOMEM;
> +
> + lp873->dev = &client->dev;
> +
> + lp873->regmap = devm_regmap_init_i2c(client, &lp873x_regmap_config);
> + if (IS_ERR(lp873->regmap)) {
> + ret = PTR_ERR(lp873->regmap);
> + dev_err(lp873->dev, "Failed to initialize register map: %d\n",
> + ret);
Nit: I'd prefer you break after "->dev,".
> + return ret;
> + }
> +
> + mutex_init(&lp873->lp873_lock);
How many locks do you have in 'struct lp873x'?
I suggest that 'lock' will do fine.
> + ret = regmap_read(lp873->regmap, LP873X_REG_OTP_REV, &otpid);
> + if (ret) {
> + dev_err(lp873->dev, "Failed to read OTP ID\n");
> + return ret;
> + }
> +
> + lp873->rev = otpid & LP873X_OTP_REV_OTP_ID;
> + i2c_set_clientdata(client, lp873);
> + ret = mfd_add_devices(lp873->dev, PLATFORM_DEVID_AUTO, lp873x_cells,
> + ARRAY_SIZE(lp873x_cells), NULL, 0, NULL);
> +
> + return ret;
> +}
> +
> +static const struct of_device_id of_lp873x_match_table[] = {
> + { .compatible = "ti,lp8733", },
> + { .compatible = "ti,lp8732", },
> + {}
> +};
> +MODULE_DEVICE_TABLE(of, of_lp873x_match_table);
> +
> +static const struct i2c_device_id lp873x_id_table[] = {
> + { "lp873x", LP873X },
> + { "lp8732", LP873X },
> + { "lp8733", LP873X },
Do you use these IDs at any point?
[...]
--
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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