linux-kernel - Re: [PATCH v10 3/5] mfd: Add support for the MediaTek MT6358 PMIC

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Message-ID: <20200325094326.GH442973@dell>
Date:   Wed, 25 Mar 2020 09:43:26 +0000
From:   Lee Jones <lee.jones@...aro.org>
To:     Hsin-Hsiung Wang <hsin-hsiung.wang@...iatek.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Mark Rutland <mark.rutland@....com>,
        Sean Wang <sean.wang@...iatek.com>,
        Sebastian Reichel <sre@...nel.org>,
        Eddie Huang <eddie.huang@...iatek.com>,
        Alessandro Zummo <a.zummo@...ertech.it>,
        Frank Wunderlich <frank-w@...lic-files.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Richard Fontana <rfontana@...hat.com>,
        Josef Friedl <josef.friedl@...ed.at>,
        Ran Bi <ran.bi@...iatek.com>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org, linux-rtc@...r.kernel.org,
        Nicolas Boichat <drinkcat@...omium.org>,
        srv_heupstream@...iatek.com
Subject: Re: [PATCH v10 3/5] mfd: Add support for the MediaTek MT6358 PMIC

On Wed, 11 Mar 2020, Hsin-Hsiung Wang wrote:

> This adds support for the MediaTek MT6358 PMIC. This is a
> multifunction device with the following sub modules:
> 
> - Regulator
> - RTC
> - Codec
> - Interrupt
> 
> It is interfaced to the host controller using SPI interface
> by a proprietary hardware called PMIC wrapper or pwrap.
> MT6358 MFD is a child device of the pwrap.
> 
> Signed-off-by: Hsin-Hsiung Wang <hsin-hsiung.wang@...iatek.com>
> ---
>  drivers/mfd/Makefile                 |   2 +-
>  drivers/mfd/mt6358-irq.c             | 236 +++++++++++++++++++++++++++++
>  drivers/mfd/mt6397-core.c            |  55 ++++++-
>  include/linux/mfd/mt6358/core.h      | 158 ++++++++++++++++++++
>  include/linux/mfd/mt6358/registers.h | 282 +++++++++++++++++++++++++++++++++++
>  include/linux/mfd/mt6397/core.h      |   3 +
>  6 files changed, 731 insertions(+), 5 deletions(-)
>  create mode 100644 drivers/mfd/mt6358-irq.c
>  create mode 100644 include/linux/mfd/mt6358/core.h
>  create mode 100644 include/linux/mfd/mt6358/registers.h
> 
> diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
> index b83f172..9af1414 100644
> --- a/drivers/mfd/Makefile
> +++ b/drivers/mfd/Makefile
> @@ -238,7 +238,7 @@ obj-$(CONFIG_INTEL_SOC_PMIC)	+= intel-soc-pmic.o
>  obj-$(CONFIG_INTEL_SOC_PMIC_BXTWC)	+= intel_soc_pmic_bxtwc.o
>  obj-$(CONFIG_INTEL_SOC_PMIC_CHTWC)	+= intel_soc_pmic_chtwc.o
>  obj-$(CONFIG_INTEL_SOC_PMIC_CHTDC_TI)	+= intel_soc_pmic_chtdc_ti.o
> -mt6397-objs	:= mt6397-core.o mt6397-irq.o
> +mt6397-objs			:= mt6397-core.o mt6397-irq.o mt6358-irq.o
>  obj-$(CONFIG_MFD_MT6397)	+= mt6397.o
>  obj-$(CONFIG_INTEL_SOC_PMIC_MRFLD)	+= intel_soc_pmic_mrfld.o
>  
> diff --git a/drivers/mfd/mt6358-irq.c b/drivers/mfd/mt6358-irq.c
> new file mode 100644
> index 0000000..022e5f5
> --- /dev/null
> +++ b/drivers/mfd/mt6358-irq.c
> @@ -0,0 +1,236 @@
> +// SPDX-License-Identifier: GPL-2.0
> +//
> +// Copyright (c) 2019 MediaTek Inc.

This is out of date.

> +#include <linux/interrupt.h>
> +#include <linux/mfd/mt6358/core.h>
> +#include <linux/mfd/mt6358/registers.h>
> +#include <linux/mfd/mt6397/core.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_device.h>
> +#include <linux/of_irq.h>
> +#include <linux/platform_device.h>
> +#include <linux/regmap.h>
> +
> +static struct irq_top_t mt6358_ints[] = {
> +	MT6358_TOP_GEN(BUCK),
> +	MT6358_TOP_GEN(LDO),
> +	MT6358_TOP_GEN(PSC),
> +	MT6358_TOP_GEN(SCK),
> +	MT6358_TOP_GEN(BM),
> +	MT6358_TOP_GEN(HK),
> +	MT6358_TOP_GEN(AUD),
> +	MT6358_TOP_GEN(MISC),
> +};
> +
> +static void pmic_irq_enable(struct irq_data *data)
> +{
> +	unsigned int hwirq = irqd_to_hwirq(data);
> +	struct mt6397_chip *chip = irq_data_get_irq_chip_data(data);

6397?

This does make me wonder how different this file is to the existing
support for the MT6397.  What is the justification for not extending
that instead of creating a brand new file?

> +	struct pmic_irq_data *irqd = chip->irq_data;
> +
> +	irqd->enable_hwirq[hwirq] = true;
> +}
> +
> +static void pmic_irq_disable(struct irq_data *data)
> +{
> +	unsigned int hwirq = irqd_to_hwirq(data);
> +	struct mt6397_chip *chip = irq_data_get_irq_chip_data(data);
> +	struct pmic_irq_data *irqd = chip->irq_data;
> +
> +	irqd->enable_hwirq[hwirq] = false;
> +}
> +
> +static void pmic_irq_lock(struct irq_data *data)
> +{
> +	struct mt6397_chip *chip = irq_data_get_irq_chip_data(data);
> +
> +	mutex_lock(&chip->irqlock);
> +}
> +
> +static void pmic_irq_sync_unlock(struct irq_data *data)
> +{
> +	unsigned int i, top_gp, gp_offset, en_reg, int_regs, shift;
> +	struct mt6397_chip *chip = irq_data_get_irq_chip_data(data);
> +	struct pmic_irq_data *irqd = chip->irq_data;
> +
> +	for (i = 0; i < irqd->num_pmic_irqs; i++) {
> +		if (irqd->enable_hwirq[i] == irqd->cache_hwirq[i])
> +			continue;
> +
> +		/* Find out the IRQ group */
> +		top_gp = 0;
> +		while ((top_gp + 1) < irqd->num_top &&
> +		       i >= mt6358_ints[top_gp + 1].hwirq_base)
> +			top_gp++;
> +
> +		/* Find the irq registers */

Nit: "IRQ"

> +		gp_offset = i - mt6358_ints[top_gp].hwirq_base;
> +		int_regs = gp_offset / MT6358_REG_WIDTH;
> +		shift = gp_offset % MT6358_REG_WIDTH;
> +		en_reg = mt6358_ints[top_gp].en_reg +
> +			 (mt6358_ints[top_gp].en_reg_shift * int_regs);
> +
> +		regmap_update_bits(chip->regmap, en_reg, BIT(shift),
> +				   irqd->enable_hwirq[i] << shift);
> +
> +		irqd->cache_hwirq[i] = irqd->enable_hwirq[i];
> +	}
> +	mutex_unlock(&chip->irqlock);
> +}

[...]

> +int mt6358_irq_init(struct mt6397_chip *chip)
> +{
> +	int i, j, ret;
> +	struct pmic_irq_data *irqd;
> +
> +	irqd = devm_kzalloc(chip->dev, sizeof(struct pmic_irq_data *),

sizeof(*irqd)

[...]

>  static const struct chip_data mt6397_core = {
>  	.cid_addr = MT6397_CID,
>  	.cid_shift = 0,
> @@ -154,19 +184,33 @@ static int mt6397_probe(struct platform_device *pdev)
>  	if (pmic->irq <= 0)
>  		return pmic->irq;
>  
> -	ret = mt6397_irq_init(pmic);
> -	if (ret)
> -		return ret;
> -
>  	switch (pmic->chip_id) {
>  	case MT6323_CHIP_ID:
> +		ret = mt6397_irq_init(pmic);
> +		if (ret)
> +			return ret;
> +
>  		ret = devm_mfd_add_devices(&pdev->dev, PLATFORM_DEVID_NONE,
>  					   mt6323_devs, ARRAY_SIZE(mt6323_devs),
>  					   NULL, 0, pmic->irq_domain);
>  		break;
>  
> +	case MT6358_CHIP_ID:
> +		ret = mt6358_irq_init(pmic);
> +		if (ret)
> +			return ret;
> +
> +		ret = devm_mfd_add_devices(&pdev->dev, PLATFORM_DEVID_NONE,
> +					   mt6358_devs, ARRAY_SIZE(mt6358_devs),
> +					   NULL, 0, pmic->irq_domain);

In a subsequent patch you can choose the correct mtXXXX_devs structure
to pass and call devm_mfd_add_devices() only once below the switch().

> +		break;
> +
>  	case MT6391_CHIP_ID:
>  	case MT6397_CHIP_ID:
> +		ret = mt6397_irq_init(pmic);
> +		if (ret)
> +			return ret;
> +
>  		ret = devm_mfd_add_devices(&pdev->dev, PLATFORM_DEVID_NONE,
>  					   mt6397_devs, ARRAY_SIZE(mt6397_devs),
>  					   NULL, 0, pmic->irq_domain);

[...]

-- 
Lee Jones [李琼斯]
Linaro Services Technical Lead
Linaro.org │ Open source software for ARM SoCs
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