Re: [PATCH 1/8] mfd: mt6358: refine interrupt code

From: Hsin-hsiung Wang
Date: Mon Aug 03 2020 - 04:29:45 EST


Hi,

On Mon, 2020-07-27 at 16:48 +0100, Lee Jones wrote:
> On Thu, 23 Jul 2020, Hsin-Hsiung Wang wrote:
>
> > This patch refines the interrupt related code to support new chips.
>
> Refines in what way?
>
> What makes this better?
>

Thanks for the comment. I will add more information into comment message
based on my below explanation.

> > Signed-off-by: Hsin-Hsiung Wang <hsin-hsiung.wang@xxxxxxxxxxxx>
> > ---
> > drivers/mfd/mt6358-irq.c | 65 ++++++++++++++++++++++++-----------------
> > include/linux/mfd/mt6358/core.h | 8 ++---
> > 2 files changed, 41 insertions(+), 32 deletions(-)
> >
> > diff --git a/drivers/mfd/mt6358-irq.c b/drivers/mfd/mt6358-irq.c
> > index db734f2..4b094e5 100644
> > --- a/drivers/mfd/mt6358-irq.c
> > +++ b/drivers/mfd/mt6358-irq.c
> > @@ -13,7 +13,9 @@
> > #include <linux/platform_device.h>
> > #include <linux/regmap.h>
> >
> > -static struct irq_top_t mt6358_ints[] = {
> > +#define MTK_PMIC_REG_WIDTH 16
> > +
> > +static const struct irq_top_t mt6358_ints[] = {
> > MT6358_TOP_GEN(BUCK),
> > MT6358_TOP_GEN(LDO),
> > MT6358_TOP_GEN(PSC),
> > @@ -24,6 +26,13 @@ static struct irq_top_t mt6358_ints[] = {
> > MT6358_TOP_GEN(MISC),
> > };
> >
> > +static struct pmic_irq_data mt6358_irqd = {
> > + .num_top = ARRAY_SIZE(mt6358_ints),
> > + .num_pmic_irqs = MT6358_IRQ_NR,
> > + .top_int_status_reg = MT6358_TOP_INT_STATUS0,
> > + .pmic_ints = mt6358_ints,
> > +};
>
> Dynamically assigned driver data is usually preferred.
>
> Why have you gone static?
>

Do you consider the memory allocation?
Below modification is to assign necessary data dynamically and the code
will become longer with more chips if we assign every member of the
structure.

@@ -180,17 +190,18 @@ int mt6358_irq_init(struct mt6397_chip *chip)
int i, j, ret;
struct pmic_irq_data *irqd;

- irqd = devm_kzalloc(chip->dev, sizeof(*irqd),
GFP_KERNEL);
- if (!irqd)
- return -ENOMEM;
+ switch (chip->chip_id) {
+ case MT6358_CHIP_ID:
+ chip->irq_data = &mt6358_irqd;
+ break;

- chip->irq_data = irqd;
+ default:
+ dev_err(chip->dev, "unsupported chip: 0x%x
\n", chip->chip_id);
+ return -ENODEV;
+ }

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 = chip->irq_data;
irqd->enable_hwirq = devm_kcalloc(chip->dev,

irqd->num_pmic_irqs,

sizeof(*irqd->enable_hwirq),