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Date: Mon, 25 Jan 2016 14:22:53 +0000
From: Lee Jones <lee.jones@...aro.org>
To: Chen Feng <puck.chen@...ilicon.com>
Cc: linux-kernel@...r.kernel.org, lgirdwood@...il.com,
broonie@...nel.org, yudongbin@...ilicon.com,
saberlily.xia@...ilicon.com, suzhuangluan@...ilicon.com,
kong.kongxinwei@...ilicon.com, xuyiping@...ilicon.com,
z.liuxinliang@...ilicon.com, puck.chenfeng@...il.com,
weidong2@...ilicon.com, w.f@...wei.com, qijiwen@...ilicon.com,
peter.panshilin@...ilicon.com, dan.zhao@...ilicon.com,
linuxarm@...wei.com, liguozhu@...ilicon.com
Subject: Re: [PATCH v5 3/5] mfd: hi655x: Add hi665x pmic driver
On Mon, 11 Jan 2016, Chen Feng wrote:
> Add pmic mfd driver to support hisilicon hi665x.
PMIC MFD
> Signed-off-by: Chen Feng <puck.chen@...ilicon.com>
> Signed-off-by: Fei Wang <w.f@...wei.com>
> Signed-off-by: Xinwei Kong <kong.kongxinwei@...ilicon.com>
> ---
> drivers/mfd/Kconfig | 10 +++
> drivers/mfd/Makefile | 1 +
> drivers/mfd/hi655x-pmic.c | 169 ++++++++++++++++++++++++++++++++++++++++
> include/linux/mfd/hi655x-pmic.h | 56 +++++++++++++
> 4 files changed, 236 insertions(+)
> create mode 100644 drivers/mfd/hi655x-pmic.c
> create mode 100644 include/linux/mfd/hi655x-pmic.h
>
> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> index 4d92df6..299d972 100644
> --- a/drivers/mfd/Kconfig
> +++ b/drivers/mfd/Kconfig
> @@ -284,6 +284,16 @@ config MFD_HI6421_PMIC
> menus in order to enable them.
> We communicate with the Hi6421 via memory-mapped I/O.
>
> +config MFD_HI655X_PMIC
> + tristate "HiSilicon Hi655X series PMU/Codec IC"
> + depends on ARCH_HISI || (COMPILE_TEST && ARM64)
Why not just COMPILE_TEST?
> + depends on OF
So this will not COMPILE_TEST if OF is not enabled.
> + select MFD_CORE
> + select REGMAP_MMIO
> + select REGMAP_IRQ
> + help
> + Select this option to enable Hisilicon hi655x series pmic driver.
> +
> config HTC_EGPIO
> bool "HTC EGPIO support"
> depends on GPIOLIB && ARM
> diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
> index a8b76b8..6a7b0e1 100644
> --- a/drivers/mfd/Makefile
> +++ b/drivers/mfd/Makefile
> @@ -186,6 +186,7 @@ obj-$(CONFIG_MFD_STW481X) += stw481x.o
> obj-$(CONFIG_MFD_IPAQ_MICRO) += ipaq-micro.o
> obj-$(CONFIG_MFD_MENF21BMC) += menf21bmc.o
> obj-$(CONFIG_MFD_HI6421_PMIC) += hi6421-pmic-core.o
> +obj-$(CONFIG_MFD_HI655X_PMIC) += hi655x-pmic.o
> obj-$(CONFIG_MFD_DLN2) += dln2.o
> obj-$(CONFIG_MFD_RT5033) += rt5033.o
> obj-$(CONFIG_MFD_SKY81452) += sky81452.o
> diff --git a/drivers/mfd/hi655x-pmic.c b/drivers/mfd/hi655x-pmic.c
> new file mode 100644
> index 0000000..aab18f7
> --- /dev/null
> +++ b/drivers/mfd/hi655x-pmic.c
> @@ -0,0 +1,169 @@
> +/*
> + * Device driver for regulators in hi655x IC
We know it's a device driver. And I hope it's not a regulator driver.
> + * Copyright (c) 2016 Hisilicon.
> + *
> + * Chen Feng <puck.chen@...ilicon.com>
> + * Fei Wang <w.f@...wei.com>
Author(s):
> + * 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.
> + */
> +
> +#include <linux/io.h>
> +#include <linux/interrupt.h>
> +#include <linux/init.h>
> +#include <linux/gpio.h>
> +#include <linux/of_gpio.h>
> +#include <linux/platform_device.h>
> +#include <linux/of_platform.h>
> +#include <linux/mfd/core.h>
> +#include <linux/mfd/hi655x-pmic.h>
> +#include <linux/regmap.h>
Alphabetical please.
> +static const struct mfd_cell hi655x_pmic_devs[] = {
> + { .name = "hi655x-regulator", },
> +};
What other devices are there?
> +static const struct regmap_irq hi655x_irqs[] = {
> + { .reg_offset = 0, .mask = OTMP_D1R_INT },
> + { .reg_offset = 0, .mask = VSYS_2P5_R_INT },
> + { .reg_offset = 0, .mask = VSYS_UV_D3R_INT },
> + { .reg_offset = 0, .mask = VSYS_6P0_D200UR_INT },
> + { .reg_offset = 0, .mask = PWRON_D4SR_INT },
> + { .reg_offset = 0, .mask = PWRON_D20F_INT },
> + { .reg_offset = 0, .mask = PWRON_D20R_INT },
> + { .reg_offset = 0, .mask = RESERVE_INT },
> +};
> +
> +static const struct regmap_irq_chip hi655x_irq_chip = {
> + .name = "hi655x-pmic",
> + .irqs = hi655x_irqs,
> + .num_regs = 1,
> + .num_irqs = ARRAY_SIZE(hi655x_irqs),
> + .status_base = HI655X_IRQ_STAT_BASE,
> + .mask_base = HI655X_IRQ_MASK_BASE,
> +};
> +
> +static unsigned int hi655x_pmic_get_version(struct hi655x_pmic *pmic)
> +{
> + u32 val;
> +
> + regmap_read(pmic->regmap,
> + HI655X_BUS_ADDR(HI655X_VER_REG), &val);
> +
> + return val;
> +}
This is a small function that you only use once.
Probably better just to call regmap_read() directly from below.
> +static struct regmap_config hi655x_regmap_config = {
> + .reg_bits = 32,
> + .reg_stride = HI655X_STRIDE,
> + .val_bits = 8,
> + .max_register = HI655X_BUS_ADDR(0xFFF),
> +};
> +
> +static void hi655x_local_irq_clear(struct regmap *map)
> +{
> + int i;
> +
> + regmap_write(map, HI655X_ANA_IRQM_BASE, HI655X_IRQ_CLR);
> + for (i = 0; i < HI655X_IRQ_ARRAY; i++) {
> + regmap_write(map, HI655X_IRQ_STAT_BASE + i * HI655X_STRIDE,
> + HI655X_IRQ_CLR);
> + }
> +}
> +
> +static int hi655x_pmic_probe(struct platform_device *pdev)
> +{
> + int ret;
> + struct hi655x_pmic *pmic;
> + struct device *dev = &pdev->dev;
> + struct device_node *np = dev->of_node;
> + void __iomem *base;
> +
> + pmic = devm_kzalloc(dev, sizeof(*pmic), GFP_KERNEL);
You need a NULL check here.
> + pmic->dev = dev;
> +
> + pmic->res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + if (!pmic->res) {
> + dev_err(dev, "platform_get_resource err\n");
This is not a good error message.
Besides, we don't normally try to catch this error, as it's checked
for you in devm_ioremap_resource().
> + return -ENOENT;
> + }
'\n' here.
> + base = devm_ioremap_resource(dev, pmic->res);
> + if (!base) {
> + dev_err(dev, "cannot map register memory\n");
devm_ioremap_resource() already prints a message on error. No need
for this.
> + return -ENOMEM;
> + }
> + pmic->regmap = devm_regmap_init_mmio_clk(dev, NULL, base,
> + &hi655x_regmap_config);
You need to check for an error here.
> + pmic->ver = hi655x_pmic_get_version(pmic);
> + if ((pmic->ver < PMU_VER_START) || (pmic->ver > PMU_VER_END)) {
> + dev_warn(dev, "it is wrong pmu version\n");
You can't issue a _warn, then return an error. Please use _err.
... and change to "PMU version %d unsupported".
> + return -EINVAL;
> + }
> +
> + hi655x_local_irq_clear(pmic->regmap);
> +
> + pmic->gpio = of_get_named_gpio(np, "pmic-gpios", 0);
> + if (!gpio_is_valid(pmic->gpio)) {
> + dev_err(dev, "cannot get the pmic-gpios\n");
> + return -ENODEV;
> + }
> +
> + ret = devm_gpio_request_one(dev, pmic->gpio, GPIOF_IN,
> + "hi655x_pmic_irq");
> + if (ret < 0) {
> + dev_err(dev, "failed to request gpio %d ret = %d\n",
More readable if you use the IRQ name, as you know it.
"Failed to obtain 'hi655x_pmic_irq'"
> + pmic->gpio, ret);
> + return ret;
> + }
> +
> + ret = regmap_add_irq_chip(pmic->regmap, gpio_to_irq(pmic->gpio),
> + IRQF_TRIGGER_LOW | IRQF_NO_SUSPEND, 0,
> + &hi655x_irq_chip, &pmic->irq_data);
> + if (ret) {
> + dev_err(dev, "add pmic irq chip error! ret %d\n", ret);
> + return ret;
> + }
> +
> + /* bind pmic to device */
"Bind PMIC to device"
It would be better if you dropped the comment completely to be honest.
> + platform_set_drvdata(pdev, pmic);
> +
> + ret = mfd_add_devices(dev, 0, hi655x_pmic_devs,
Please use the #defines for the second parameter.
> + ARRAY_SIZE(hi655x_pmic_devs), NULL, 0, NULL);
> + if (ret) {
> + dev_err(dev, "add mfd devices failed: %d\n", ret);
"Failed to register device".
> + regmap_del_irq_chip(pmic->irq, pmic->irq_data);
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +static int hi655x_pmic_remove(struct platform_device *pdev)
> +{
> + mfd_remove_devices(&pdev->dev);
> +
> + return 0;
> +}
> +
> +static const struct of_device_id of_hi655x_pmic_match_tbl[] = {
> + { .compatible = "hisilicon,hi655x-pmic", },
> + {},
> +};
> +
> +static struct platform_driver hi655x_pmic_driver = {
> + .driver = {
> + .name = "hi655x-pmic",
> + .of_match_table = of_hi655x_pmic_match_tbl,
of_match_ptr()
> + },
> + .probe = hi655x_pmic_probe,
> + .remove = hi655x_pmic_remove,
> +};
> +module_platform_driver(hi655x_pmic_driver);
> +
> +MODULE_AUTHOR("Chen Feng <puck.chen@...ilicon.com>");
> +MODULE_DESCRIPTION("Hisilicon hi655x pmic driver");
PMIC
> +MODULE_LICENSE("GPL v2");
> diff --git a/include/linux/mfd/hi655x-pmic.h b/include/linux/mfd/hi655x-pmic.h
> new file mode 100644
> index 0000000..e1af0a1
> --- /dev/null
> +++ b/include/linux/mfd/hi655x-pmic.h
> @@ -0,0 +1,56 @@
> +/*
> + * Device driver for regulators in hi655x IC
> + *
> + * Copyright (c) 2016 Hisilicon.
> + *
> + * Chen Feng <puck.chen@...ilicon.com>
> + * Fei Wang <w.f@...wei.com>
Author(s):
> + * 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.
> + */
> +
> +#ifndef __HI655X_PMIC_H
> +#define __HI655X_PMIC_H
> +
> +/* Hi655x registers are mapped to memory bus in 4 bytes stride */
> +#define HI655X_STRIDE (4)
> +#define HI655X_BUS_ADDR(x) ((x) << 2)
> +
> +#define HI655X_BITS (8)
> +
> +#define HI655X_NR_IRQ (32)
> +
> +#define HI655X_IRQ_STAT_BASE (0x003 << 2)
> +#define HI655X_IRQ_MASK_BASE (0x007 << 2)
> +#define HI655X_ANA_IRQM_BASE (0x1b5 << 2)
> +#define HI655X_IRQ_ARRAY (4)
> +#define HI655X_IRQ_MASK (0xFF)
> +#define HI655X_IRQ_CLR (0xFF)
> +#define HI655X_VER_REG (0x00)
> +
> +#define PMU_VER_START (0x10)
> +#define PMU_VER_END (0x38)
> +
> +#define RESERVE_INT (BIT(7))
> +#define PWRON_D20R_INT (BIT(6))
> +#define PWRON_D20F_INT (BIT(5))
> +#define PWRON_D4SR_INT (BIT(4))
> +#define VSYS_6P0_D200UR_INT (BIT(3))
> +#define VSYS_UV_D3R_INT (BIT(2))
> +#define VSYS_2P5_R_INT (BIT(1))
> +#define OTMP_D1R_INT (BIT(0))
No need for the extra ()'s
> +struct hi655x_pmic {
> + struct resource *res;
> + struct device *dev;
> + struct regmap *regmap;
> + struct clk *clk;
Is this used?
> + int irq;
> + int gpio;
> + unsigned int ver;
> + struct regmap_irq_chip_data *irq_data;
> +};
Check to see if they are all used.
> +#endif
--
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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