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Date: Mon, 5 Jun 2017 19:57:30 +0800
From: Guodong Xu <guodong.xu@...aro.org>
To: Lee Jones <lee.jones@...aro.org>
Cc: Rob Herring <robh+dt@...nel.org>,
Mark Rutland <mark.rutland@....com>,
"xuwei (O)" <xuwei5@...ilicon.com>,
Catalin Marinas <catalin.marinas@....com>,
Will Deacon <will.deacon@....com>,
Liam Girdwood <lgirdwood@...il.com>,
Mark Brown <broonie@...nel.org>,
Kevin Hilman <khilman@...libre.com>,
Arnd Bergmann <arnd@...db.de>,
Gregory CLEMENT <gregory.clement@...e-electrons.com>,
horms+renesas@...ge.net.au, Olof Johansson <olof@...om.net>,
Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
Masahiro Yamada <yamada.masahiro@...ionext.com>,
Riku Voipio <riku.voipio@...aro.org>,
Thierry Reding <treding@...dia.com>,
Krzysztof Kozlowski <krzk@...nel.org>,
Eric Anholt <eric@...olt.net>, damm+renesas@...nsource.se,
Ard Biesheuvel <ard.biesheuvel@...aro.org>,
Linus Walleij <linus.walleij@...aro.org>,
Geert Uytterhoeven <geert+renesas@...der.be>,
devicetree@...r.kernel.org,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
"hw Wang(Xiaoyin)" <hw.wangxiaoyin@...ilicon.com>
Subject: Re: [PATCH v3 2/6] mfd: hi6421-pmic: add support for HiSilicon Hi6421v530
On Mon, Jun 5, 2017 at 4:24 PM, Lee Jones <lee.jones@...aro.org> wrote:
> 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.
>
I will add that as 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 },
> { },
>
Thanks, I will change that.
>> 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.
>
Sure. I will update.
>> + 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.
>
Thanks. I will update.
>> 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.
>
I will do.
>> 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'.
I'll change this to PLATFORM_DEVID_NONE
>
>> + 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.
>
will do.
>> 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?
>
I didn't get your point. I have no special reason. Actually, any value
should work. I just need two value to differentiate two chips.
Did you see any problem if I use 1 and 2?
-Guodong
>> +};
>> +
>> #endif /* __HI6421_PMIC_H */
>
> --
> Lee Jones
> Linaro STMicroelectronics Landing Team Lead
> Linaro.org │ Open source software for ARM SoCs
> Follow Linaro: Facebook | Twitter | Blog
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