Date:   Fri, 6 Dec 2019 16:55:58 +0800
From:   Hsin-hsiung Wang <hsin-hsiung.wang@...iatek.com>
To:     Pi-Hsun Shih <pihsun@...omium.org>
CC:     Mark Rutland <mark.rutland@....com>,
        Alessandro Zummo <a.zummo@...ertech.it>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        <srv_heupstream@...iatek.com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Sean Wang <sean.wang@...iatek.com>,
        "Liam Girdwood" <lgirdwood@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        open list <linux-kernel@...r.kernel.org>,
        Richard Fontana <rfontana@...hat.com>,
        "Mark Brown" <broonie@...nel.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-arm-kernel@...ts.infradead.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Eddie Huang <eddie.huang@...iatek.com>,
        Lee Jones <lee.jones@...aro.org>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        "open list:REAL TIME CLOCK (RTC) SUBSYSTEM" 
        <linux-rtc@...r.kernel.org>
Subject: Re: [PATCH v5 06/10] mfd: Add support for the MediaTek MT6358 PMIC

Hi,

On Mon, 2019-12-02 at 16:06 +0800, Pi-Hsun Shih wrote:
> Hi,
> 
> On Fri, Aug 23, 2019 at 11:46 AM Hsin-Hsiung Wang
> <hsin-hsiung.wang@...iatek.com> 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                 |   3 +-
> >  drivers/mfd/mt6358-irq.c             | 231 ++++++++++++++++++++++++++++
> >  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, 727 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/mt6358-irq.c b/drivers/mfd/mt6358-irq.c
> > new file mode 100644
> > index 0000000..760b72f
> > --- /dev/null
> > +++ b/drivers/mfd/mt6358-irq.c
> > @@ -0,0 +1,231 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +//
> > +// Copyright (c) 2019 MediaTek Inc.
...
> > +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;
> > +
> > +               /* Find out the irq group */
> > +               top_gp = 0;
> > +               while ((top_gp + 1) < ARRAY_SIZE(mt6358_ints) &&
> > +                      i >= mt6358_ints[top_gp + 1].hwirq_base)
> > +                       top_gp++;
> > +
> > +               if (top_gp >= ARRAY_SIZE(mt6358_ints)) {
> 
> Would this condition ever be true? The while loop before this always
> break when top_gp == ARRAY_SIZE(mt6358_ints) - 1.
> 

Thanks for reviewing. I will remove this part in next patch.

> > +                       mutex_unlock(&chip->irqlock);
> > +                       dev_err(chip->dev,
> > +                               "Failed to get top_group: %d\n", top_gp);
> > +                       return;
> > +               }
> > +
> > +               /* Find the irq registers */
> > +               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);
> > +}
> > +
> > +static struct irq_chip mt6358_irq_chip = {
> > +       .name = "mt6358-irq",
> > +       .flags = IRQCHIP_SKIP_SET_WAKE,
> > +       .irq_enable = pmic_irq_enable,
> > +       .irq_disable = pmic_irq_disable,
> > +       .irq_bus_lock = pmic_irq_lock,
> > +       .irq_bus_sync_unlock = pmic_irq_sync_unlock,
> > +};
> > +
> > +static void mt6358_irq_sp_handler(struct mt6397_chip *chip,
> > +                                 unsigned int top_gp)
> > +{
> > +       unsigned int sta_reg, irq_status;
> > +       unsigned int hwirq, virq;
> > +       int ret, i, j;
> > +
> > +       for (i = 0; i < mt6358_ints[top_gp].num_int_regs; i++) {
> > +               sta_reg = mt6358_ints[top_gp].sta_reg +
> > +                       mt6358_ints[top_gp].sta_reg_shift * i;
> > +               ret = regmap_read(chip->regmap, sta_reg, &irq_status);
> > +               if (ret) {
> > +                       dev_err(chip->dev,
> > +                               "Failed to read irq status: %d\n", ret);
> > +                       return;
> > +               }
> > +
> > +               if (!irq_status)
> > +                       continue;
> > +
> > +               for (j = 0; j < MT6358_REG_WIDTH ; j++) {
> > +                       if ((irq_status & BIT(j)) == 0)
> > +                               continue;
> > +                       hwirq = mt6358_ints[top_gp].hwirq_base +
> > +                               MT6358_REG_WIDTH * i + j;
> > +                       virq = irq_find_mapping(chip->irq_domain, hwirq);
> > +                       if (virq)
> > +                               handle_nested_irq(virq);
> > +               }
> > +
> > +               regmap_write(chip->regmap, sta_reg, irq_status);
> > +       }
> > +}
> > +
> > +static irqreturn_t mt6358_irq_handler(int irq, void *data)
> > +{
> > +       struct mt6397_chip *chip = data;
> > +       struct pmic_irq_data *mt6358_irq_data = chip->irq_data;
> > +       unsigned int top_irq_status;
> > +       unsigned int i;
> > +       int ret;
> > +
> > +       ret = regmap_read(chip->regmap,
> > +                         mt6358_irq_data->top_int_status_reg,
> > +                         &top_irq_status);
> > +       if (ret) {
> > +               dev_err(chip->dev, "Can't read TOP_INT_STATUS ret=%d\n", ret);
> > +               return IRQ_NONE;
> > +       }
> > +
> > +       for (i = 0; i < mt6358_irq_data->num_top; i++) {
> > +               if (top_irq_status & BIT(mt6358_ints[i].top_offset))
> > +                       mt6358_irq_sp_handler(chip, i);
> > +       }
> > +
> > +       return IRQ_HANDLED;
> > +}
> > +
> > +static int pmic_irq_domain_map(struct irq_domain *d, unsigned int irq,
> > +                              irq_hw_number_t hw)
> > +{
> > +       struct mt6397_chip *mt6397 = d->host_data;
> > +
> > +       irq_set_chip_data(irq, mt6397);
> > +       irq_set_chip_and_handler(irq, &mt6358_irq_chip, handle_level_irq);
> > +       irq_set_nested_thread(irq, 1);
> > +       irq_set_noprobe(irq);
> > +
> > +       return 0;
> > +}
> > +
> > +static const struct irq_domain_ops mt6358_irq_domain_ops = {
> > +       .map = pmic_irq_domain_map,
> > +       .xlate = irq_domain_xlate_twocell,
> > +};
> > +
> > +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);
> 
> ARRAY_SIZE(mt6358_ints) is still used in pmic_irq_sync_unlock. Is this
> variable needed, or should the ARRAY_SIZE(mt6358_ints) in
> pmic_irq_sync_unlock be changed to irqd->num_top too?
> 

I will update to irqd->num_top from ARRAY_SIZE(mt6358_ints) in
pmic_irq_sync_unlock.

> > +
> > +       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 interrupts for initializing */
> > +       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");
> > +               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;
> > +}
> > (...)
> 
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