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Date: Mon, 5 Jun 2017 09:24:06 +0100
From: Lee Jones <lee.jones@...aro.org>
To: Guodong Xu <guodong.xu@...aro.org>
Cc: robh+dt@...nel.org, mark.rutland@....com, xuwei5@...ilicon.com,
catalin.marinas@....com, will.deacon@....com, lgirdwood@...il.com,
broonie@...nel.org, khilman@...libre.com, arnd@...db.de,
gregory.clement@...e-electrons.com, horms+renesas@...ge.net.au,
olof@...om.net, thomas.petazzoni@...e-electrons.com,
yamada.masahiro@...ionext.com, riku.voipio@...aro.org,
treding@...dia.com, krzk@...nel.org, eric@...olt.net,
damm+renesas@...nsource.se, ard.biesheuvel@...aro.org,
linus.walleij@...aro.org, geert+renesas@...der.be,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, hw.wangxiaoyin@...ilicon.com
Subject: Re: [PATCH v3 2/6] mfd: hi6421-pmic: add support for HiSilicon
Hi6421v530
On Fri, 02 Jun 2017, Guodong Xu wrote:
> Add support for HiSilicon Hi6421v530 PMIC. Hi6421v530 communicates with
> main SoC via memory-mapped I/O.
>
> Hi6421v530 and Hi6421 are PMIC chips from the same vendor, HiSilicon,
> but at different revisions. They share the same memory-mapped I/O
> design. They differ in integrated devices, such as regulator details,
> LDO voltage points.
>
> Also, changed license to a shorter form, and arranged all #include in
> alphabetical order.
>
> Signed-off-by: Wang Xiaoyin <hw.wangxiaoyin@...ilicon.com>
> Signed-off-by: Guodong Xu <guodong.xu@...aro.org>
> ---
> drivers/mfd/hi6421-pmic-core.c | 85 +++++++++++++++++++++++++----------------
> include/linux/mfd/hi6421-pmic.h | 5 +++
> 2 files changed, 58 insertions(+), 32 deletions(-)
>
> diff --git a/drivers/mfd/hi6421-pmic-core.c b/drivers/mfd/hi6421-pmic-core.c
> index 3fd703f..b914541 100644
> --- a/drivers/mfd/hi6421-pmic-core.c
> +++ b/drivers/mfd/hi6421-pmic-core.c
> @@ -1,40 +1,35 @@
> /*
> - * Device driver for Hi6421 IC
> + * Device driver for Hi6421 PMIC
> *
> * Copyright (c) <2011-2014> HiSilicon Technologies Co., Ltd.
> * http://www.hisilicon.com
> - * Copyright (c) <2013-2014> Linaro Ltd.
> + * Copyright (c) <2013-2017> Linaro Ltd.
> * http://www.linaro.org
> *
> * Author: Guodong Xu <guodong.xu@...aro.org>
> *
> * 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 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, see <http://www.gnu.org/licenses/>.
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
Nice change, but this should be a separate patch.
> */
>
> #include <linux/device.h>
> #include <linux/err.h>
> #include <linux/mfd/core.h>
> +#include <linux/mfd/hi6421-pmic.h>
> #include <linux/module.h>
> -#include <linux/of.h>
> +#include <linux/of_device.h>
> #include <linux/platform_device.h>
> #include <linux/regmap.h>
> -#include <linux/mfd/hi6421-pmic.h>
>
> static const struct mfd_cell hi6421_devs[] = {
> { .name = "hi6421-regulator", },
> };
>
> +static const struct mfd_cell hi6421v530_devs[] = {
> + { .name = "hi6421v530-regulator", },
> +};
> +
> static const struct regmap_config hi6421_regmap_config = {
> .reg_bits = 32,
> .reg_stride = 4,
> @@ -42,12 +37,30 @@ static const struct regmap_config hi6421_regmap_config = {
> .max_register = HI6421_REG_TO_BUS_ADDR(HI6421_REG_MAX),
> };
>
> +static const struct of_device_id of_hi6421_pmic_match[] = {
> + { .compatible = "hisilicon,hi6421-pmic",
> + .data = (void *)HI6421 },
> + { .compatible = "hisilicon,hi6421v530-pmic",
> + .data = (void *)HI6421_V530 },
> + { },
> +};
> +MODULE_DEVICE_TABLE(of, of_hi6421_pmic_match);
This formatting is odd. If both attributes won't fit on a single
line, please place them on completely separate lines. This includes
the braces. Something like this:
{
.compatible = "hisilicon,hi6421-pmic",
.data = (void *)HI6421
}, {
.compatible = "hisilicon,hi6421v530-pmic",
.data = (void *)HI6421_V530 },
{ },
> static int hi6421_pmic_probe(struct platform_device *pdev)
> {
> struct hi6421_pmic *pmic;
> struct resource *res;
> void __iomem *base;
> - int ret;
> + const struct of_device_id *id;
> + unsigned long type;
> + const struct mfd_cell *subdevs = NULL;
> + int n_subdevs, ret;
Better to reorganise this a little. I tend to have the complex data
types at the top running down to simple 'int' types at the bottom.
> + id = of_match_device(of_hi6421_pmic_match, &pdev->dev);
> + if (id)
> + type = (unsigned long)id->data;
> + else
> + return -EINVAL;
Place "!id" in the if statement, then you can drop the else.
> pmic = devm_kzalloc(&pdev->dev, sizeof(*pmic), GFP_KERNEL);
> if (!pmic)
> @@ -61,41 +74,49 @@ static int hi6421_pmic_probe(struct platform_device *pdev)
> pmic->regmap = devm_regmap_init_mmio_clk(&pdev->dev, NULL, base,
> &hi6421_regmap_config);
> if (IS_ERR(pmic->regmap)) {
> - dev_err(&pdev->dev,
> - "regmap init failed: %ld\n", PTR_ERR(pmic->regmap));
> + dev_err(&pdev->dev, "Failed to initialise Regmap: %ld\n",
> + PTR_ERR(pmic->regmap));
Separate patch.
> return PTR_ERR(pmic->regmap);
> }
>
> - /* set over-current protection debounce 8ms */
> - regmap_update_bits(pmic->regmap, HI6421_OCP_DEB_CTRL_REG,
> + platform_set_drvdata(pdev, pmic);
> +
> + switch (type) {
> + case HI6421:
> + /* set over-current protection debounce 8ms */
> + regmap_update_bits(pmic->regmap, HI6421_OCP_DEB_CTRL_REG,
> (HI6421_OCP_DEB_SEL_MASK
> | HI6421_OCP_EN_DEBOUNCE_MASK
> | HI6421_OCP_AUTO_STOP_MASK),
> (HI6421_OCP_DEB_SEL_8MS
> | HI6421_OCP_EN_DEBOUNCE_ENABLE));
>
> - platform_set_drvdata(pdev, pmic);
> + subdevs = hi6421_devs;
> + n_subdevs = ARRAY_SIZE(hi6421_devs);
> + break;
> + case HI6421_V530:
> + subdevs = hi6421v530_devs;
> + n_subdevs = ARRAY_SIZE(hi6421v530_devs);
> + break;
> + default:
> + dev_err(&pdev->dev, "Unknown device type %ld\n", type);
> + return -EINVAL;
> + }
>
> - ret = devm_mfd_add_devices(&pdev->dev, 0, hi6421_devs,
> - ARRAY_SIZE(hi6421_devs), NULL, 0, NULL);
> + ret = devm_mfd_add_devices(&pdev->dev, 0, subdevs,
Use the proper defines, not '0'.
> + n_subdevs, NULL, 0, NULL);
> if (ret) {
> - dev_err(&pdev->dev, "add mfd devices failed: %d\n", ret);
> + dev_err(&pdev->dev, "Failed to add child devices: %d\n", ret);
This needs to be grouped with the other error message change above.
> return ret;
> }
>
> return 0;
> }
>
> -static const struct of_device_id of_hi6421_pmic_match_tbl[] = {
> - { .compatible = "hisilicon,hi6421-pmic", },
> - { },
> -};
> -MODULE_DEVICE_TABLE(of, of_hi6421_pmic_match_tbl);
> -
> static struct platform_driver hi6421_pmic_driver = {
> .driver = {
> - .name = "hi6421_pmic",
> - .of_match_table = of_hi6421_pmic_match_tbl,
> + .name = "hi6421_pmic",
> + .of_match_table = of_hi6421_pmic_match,
> },
> .probe = hi6421_pmic_probe,
> };
> diff --git a/include/linux/mfd/hi6421-pmic.h b/include/linux/mfd/hi6421-pmic.h
> index 587273e..2457438 100644
> --- a/include/linux/mfd/hi6421-pmic.h
> +++ b/include/linux/mfd/hi6421-pmic.h
> @@ -38,4 +38,9 @@ struct hi6421_pmic {
> struct regmap *regmap;
> };
>
> +enum hi6421_type {
> + HI6421 = 1,
> + HI6421_V530 = 2,
Why 1 and 2?
> +};
> +
> #endif /* __HI6421_PMIC_H */
--
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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