linux-kernel - Re: [PATCH V2 1/2] gpio: pmic-eic-sprd: Two-dimensional arrays maintain pmic eic

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Date:   Wed, 27 Sep 2023 17:24:17 +0800
From:   Chunyan Zhang <zhang.lyra@...il.com>
To:     Baolin Wang <baolin.wang@...ux.alibaba.com>
Cc:     Wenhua Lin <Wenhua.Lin@...soc.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Andy Shevchenko <andy@...nel.org>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Orson Zhai <orsonzhai@...il.com>, linux-gpio@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        wenhua lin <wenhua.lin1994@...il.com>,
        Xiongpeng Wu <xiongpeng.wu@...soc.com>
Subject: Re: [PATCH V2 1/2] gpio: pmic-eic-sprd: Two-dimensional arrays
 maintain pmic eic

On Wed, 27 Sept 2023 at 17:04, Baolin Wang
<baolin.wang@...ux.alibaba.com> wrote:
>
>
>
> On 9/21/2023 8:25 PM, Wenhua Lin wrote:
> > A bank PMIC EIC contains 16 EICs, and the operating registers
> > are BIT0-BIT15, such as BIT0 of the register operated by EIC0.
> > Using the one-dimensional array reg[CACHE_NR_REGS] for maintenance
> > will cause the configuration of other EICs to be affected when
> > operating a certain EIC. In order to solve this problem, the register
> > operation bits of each PMIC EIC are maintained through the two-dimensional
> > array reg[SPRD_PMIC_EIC_NR][CACHE_NR_REGS] to avoid mutual interference.
>
> LGTM. And this also deserves a Fixes tag.

Do we really need a two-dimensional array to save 16-bit value?

> Reviewed-by: Baolin Wang <baolin.wang@...ux.alibaba.com>
>
> > Signed-off-by: Wenhua Lin <Wenhua.Lin@...soc.com>
> > ---
> >   drivers/gpio/gpio-pmic-eic-sprd.c | 21 +++++++++++----------
> >   1 file changed, 11 insertions(+), 10 deletions(-)
> >
> > diff --git a/drivers/gpio/gpio-pmic-eic-sprd.c b/drivers/gpio/gpio-pmic-eic-sprd.c
> > index c3e4d90f6b18..442968bb2490 100644
> > --- a/drivers/gpio/gpio-pmic-eic-sprd.c
> > +++ b/drivers/gpio/gpio-pmic-eic-sprd.c
> > @@ -57,7 +57,7 @@ struct sprd_pmic_eic {
> >       struct gpio_chip chip;
> >       struct regmap *map;
> >       u32 offset;
> > -     u8 reg[CACHE_NR_REGS];
> > +     u8 reg[SPRD_PMIC_EIC_NR][CACHE_NR_REGS];
> >       struct mutex buslock;
> >       int irq;
> >   };
> > @@ -151,8 +151,8 @@ static void sprd_pmic_eic_irq_mask(struct irq_data *data)
> >       struct sprd_pmic_eic *pmic_eic = gpiochip_get_data(chip);
> >       u32 offset = irqd_to_hwirq(data);
> >
> > -     pmic_eic->reg[REG_IE] = 0;
> > -     pmic_eic->reg[REG_TRIG] = 0;
> > +     pmic_eic->reg[offset][REG_IE] = 0;
> > +     pmic_eic->reg[offset][REG_TRIG] = 0;
> >
> >       gpiochip_disable_irq(chip, offset);
> >   }
> > @@ -165,8 +165,8 @@ static void sprd_pmic_eic_irq_unmask(struct irq_data *data)
> >
> >       gpiochip_enable_irq(chip, offset);
> >
> > -     pmic_eic->reg[REG_IE] = 1;
> > -     pmic_eic->reg[REG_TRIG] = 1;
> > +     pmic_eic->reg[offset][REG_IE] = 1;
> > +     pmic_eic->reg[offset][REG_TRIG] = 1;
> >   }
> >
> >   static int sprd_pmic_eic_irq_set_type(struct irq_data *data,
> > @@ -174,13 +174,14 @@ static int sprd_pmic_eic_irq_set_type(struct irq_data *data,
> >   {
> >       struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
> >       struct sprd_pmic_eic *pmic_eic = gpiochip_get_data(chip);
> > +     u32 offset = irqd_to_hwirq(data);
> >
> >       switch (flow_type) {
> >       case IRQ_TYPE_LEVEL_HIGH:
> > -             pmic_eic->reg[REG_IEV] = 1;
> > +             pmic_eic->reg[offset][REG_IEV] = 1;
> >               break;
> >       case IRQ_TYPE_LEVEL_LOW:
> > -             pmic_eic->reg[REG_IEV] = 0;
> > +             pmic_eic->reg[offset][REG_IEV] = 0;
> >               break;
> >       case IRQ_TYPE_EDGE_RISING:
> >       case IRQ_TYPE_EDGE_FALLING:
> > @@ -222,15 +223,15 @@ static void sprd_pmic_eic_bus_sync_unlock(struct irq_data *data)
> >                       sprd_pmic_eic_update(chip, offset, SPRD_PMIC_EIC_IEV, 1);
> >       } else {
> >               sprd_pmic_eic_update(chip, offset, SPRD_PMIC_EIC_IEV,
> > -                                  pmic_eic->reg[REG_IEV]);
> > +                                  pmic_eic->reg[offset][REG_IEV]);
> >       }
> >
> >       /* Set irq unmask */
> >       sprd_pmic_eic_update(chip, offset, SPRD_PMIC_EIC_IE,
> > -                          pmic_eic->reg[REG_IE]);
> > +                          pmic_eic->reg[offset][REG_IE]);
> >       /* Generate trigger start pulse for debounce EIC */
> >       sprd_pmic_eic_update(chip, offset, SPRD_PMIC_EIC_TRIG,
> > -                          pmic_eic->reg[REG_TRIG]);
> > +                          pmic_eic->reg[offset][REG_TRIG]);
> >
> >       mutex_unlock(&pmic_eic->buslock);
> >   }