Re: [PATCH v4 06/10] mfd: Add support for the MediaTek MT6358 PMIC

From: Hsin-hsiung Wang
Date: Thu Aug 22 2019 - 21:57:21 EST

Next message: ndrw: "Re: Let's talk about the elephant in the room - the Linux kernel's inability to gracefully handle low memory pressure"
Previous message: tip-bot2 for Heiner Kallweit: "[tip: x86/irq] x86/irq: Improve definition of VECTOR_SHUTDOWN et al"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]

Hi,

On Mon, 2019-08-12 at 11:59 +0100, Lee Jones wrote:
> On Mon, 05 Aug 2019, 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@xxxxxxxxxxxx>
> > ---
> > drivers/mfd/Makefile | 3 +-
> > drivers/mfd/mt6358-irq.c | 229 ++++++++++++++++++++++++++++
> > drivers/mfd/mt6397-core.c | 52 ++++++-
> > include/linux/mfd/mt6358/core.h | 158 ++++++++++++++++++++
> > include/linux/mfd/mt6358/registers.h | 282 +++++++++++++++++++++++++++++++++++
> > include/linux/mfd/mt6397/core.h | 3 +
> > 6 files changed, 725 insertions(+), 2 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 9a96325..36d088b 100644
> > --- a/drivers/mfd/Makefile
> > +++ b/drivers/mfd/Makefile
> > @@ -241,7 +241,8 @@ 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_MFD_ALTERA_A10SR) += altera-a10sr.o
> > diff --git a/drivers/mfd/mt6358-irq.c b/drivers/mfd/mt6358-irq.c
> > new file mode 100644
> > index 0000000..2f55079
> > --- /dev/null
> > +++ b/drivers/mfd/mt6358-irq.c
> > @@ -0,0 +1,229 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +//
> > +// Copyright (c) 2019 MediaTek Inc.
> > +
> > +#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 void pmic_irq_sync_unlock(struct irq_data *data)
> > +{
> > + unsigned int i, top_gp, 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;
> > +
> > + top_gp = 0;
> > + while ((top_gp + 1) < ARRAY_SIZE(mt6358_ints) &&
> > + i >= mt6358_ints[top_gp + 1].hwirq_base)
> > + top_gp++;
>
> A comment here would make this easier to follow.
>
I will add it in next version.
> > + if (top_gp >= ARRAY_SIZE(mt6358_ints)) {
> > + mutex_unlock(&chip->irqlock);
> > + dev_err(chip->dev,
> > + "Failed to get top_group: %d\n", top_gp);
> > + return;
> > + }
> > +
> > + int_regs = (i - mt6358_ints[top_gp].hwirq_base) /
> > + MT6358_REG_WIDTH;
> > + en_reg = mt6358_ints[top_gp].en_reg +
> > + mt6358_ints[top_gp].en_reg_shift * int_regs;
> > + shift = (i - mt6358_ints[top_gp].hwirq_base) % MT6358_REG_WIDTH;
> > + 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 *),
> > + GFP_KERNEL);
> > + if (!irqd)
> > + return -ENOMEM;
> > +
> > + chip->irq_data = irqd;
> > +
> > + mutex_init(&chip->irqlock);
> > + irqd->top_int_status_reg = MT6358_TOP_INT_STATUS0;
> > + irqd->num_pmic_irqs = MT6358_IRQ_NR;
> > + irqd->num_top = ARRAY_SIZE(mt6358_ints);
> > +
> > + irqd->enable_hwirq = devm_kcalloc(chip->dev,
> > + irqd->num_pmic_irqs,
> > + sizeof(bool),
> > + GFP_KERNEL);
> > + if (!irqd->enable_hwirq)
> > + return -ENOMEM;
> > +
> > + irqd->cache_hwirq = devm_kcalloc(chip->dev,
> > + irqd->num_pmic_irqs,
> > + sizeof(bool),
> > + GFP_KERNEL);
> > + if (!irqd->cache_hwirq)
> > + return -ENOMEM;
> > +
> > + /* Disable all interrupt for initializing */
>
> s/interrupt/interrupts/
>
I will fix it in the next version.
> > + for (i = 0; i < irqd->num_top; i++) {
> > + for (j = 0; j < mt6358_ints[i].num_int_regs; j++)
> > + regmap_write(chip->regmap,
> > + mt6358_ints[i].en_reg +
> > + mt6358_ints[i].en_reg_shift * j, 0);
> > + }
> > +
> > + chip->irq_domain = irq_domain_add_linear(chip->dev->of_node,
> > + irqd->num_pmic_irqs,
> > + &mt6358_irq_domain_ops, chip);
> > + if (!chip->irq_domain) {
> > + dev_err(chip->dev, "could not create irq domain\n");
>
> s/irq/IRQ/
>
I will fix it in the next version.
> > + return -ENODEV;
> > + }
> > +
> > + ret = devm_request_threaded_irq(chip->dev, chip->irq, NULL,
> > + mt6358_irq_handler, IRQF_ONESHOT,
> > + mt6358_irq_chip.name, chip);
> > + if (ret) {
> > + dev_err(chip->dev, "failed to register irq=%d; err: %d\n",
> > + chip->irq, ret);
> > + return ret;
> > + }
> > +
> > + enable_irq_wake(chip->irq);
> > + return ret;
> > +}
>
> [...]
>
> > static const struct chip_data mt6397_core = {
> > .cid_addr = MT6397_CID,
> > .cid_shift = 0,
> > @@ -135,7 +172,11 @@ static int mt6397_probe(struct platform_device *pdev)
> > if (pmic->irq <= 0)
> > return pmic->irq;
> >
> > - ret = mt6397_irq_init(pmic);
> > + if (pmic->chip_id == MT6358_CHIP_ID)
> > + ret = mt6358_irq_init(pmic);
> > + else
> > + ret = mt6397_irq_init(pmic);
> > +
>
> You may with so to check for both and error out on an unsupported chip
> ID.
>
Thanks for the comments.
For now, we have two kinds of irq desigen, new (mt6358) and others
(including mt6391/mt6397/mt6323).
For the unsupported chip, we have a check in the mt6397_irq_init.

> > if (ret)
> > return ret;
> >
> > @@ -146,6 +187,12 @@ static int mt6397_probe(struct platform_device *pdev)
> > 0, pmic->irq_domain);
> > break;
> >
> > + case MT6358_CHIP_ID:
> > + ret = devm_mfd_add_devices(&pdev->dev, -1, mt6358_devs,
>
> Not -1. Please use the defines.
>
> > + ARRAY_SIZE(mt6358_devs), NULL,
> > + 0, pmic->irq_domain);
> > + break;
> > +
> > case MT6391_CHIP_ID:
> > case MT6397_CHIP_ID:
> > ret = devm_mfd_add_devices(&pdev->dev, -1, mt6397_devs,
> > @@ -171,6 +218,9 @@ static const struct of_device_id mt6397_of_match[] = {
> > .compatible = "mediatek,mt6323",
> > .data = &mt6323_core,
> > }, {
> > + .compatible = "mediatek,mt6358",
> > + .data = &mt6358_core,
> > + }, {
> > .compatible = "mediatek,mt6397",
> > .data = &mt6397_core,
> > }, {
> > diff --git a/include/linux/mfd/mt6358/core.h b/include/linux/mfd/mt6358/core.h
> > new file mode 100644
> > index 0000000..05108617
> > --- /dev/null
> > +++ b/include/linux/mfd/mt6358/core.h
> > @@ -0,0 +1,158 @@
> > +/* SPDX-License-Identifier: GPL-2.0 */
> > +/*
> > + * Copyright (c) 2019 MediaTek Inc.
> > + */
> > +
> > +#ifndef __MFD_MT6358_CORE_H__
> > +#define __MFD_MT6358_CORE_H__
> > +
> > +#define MT6358_REG_WIDTH 16
>
> [...]
>
> > +#define MT6358_TOP_GEN(sp) \
> > +{ \
> > + .hwirq_base = MT6358_IRQ_##sp##_BASE, \
> > + .num_int_regs = \
> > + ((MT6358_IRQ_##sp##_BITS - 1) / MT6358_REG_WIDTH) + 1, \
> > + .num_int_bits = MT6358_IRQ_##sp##_BITS, \
> > + .en_reg = MT6358_##sp##_TOP_INT_CON0, \
> > + .en_reg_shift = 0x6, \
> > + .sta_reg = MT6358_##sp##_TOP_INT_STATUS0, \
> > + .sta_reg_shift = 0x2, \
> > + .top_offset = MT6358_##sp##_TOP, \
> > +}
>
> Please tab out the '\'s.
>
I will fix it in the next version.

Next message: ndrw: "Re: Let's talk about the elephant in the room - the Linux kernel's inability to gracefully handle low memory pressure"
Previous message: tip-bot2 for Heiner Kallweit: "[tip: x86/irq] x86/irq: Improve definition of VECTOR_SHUTDOWN et al"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]