Subject: Re: [PATCH v17 09/14] gpio: uniphier: Utilize for_each_set_clump8 macro

From: William Breathitt Gray <[email-masked]>
Date: Wed, 9 Oct 2019 13:05:08 -0400

On Thu, Oct 10, 2019 at 01:33:06AM +0900, Masahiro Yamada wrote:
> On Thu, Oct 10, 2019 at 12:27 AM William Breathitt Gray
> <[email-masked]> wrote:
> >
> > Replace verbose implementation in set_multiple callback with
> > for_each_set_clump8 macro to simplify code and improve clarity. An
> > improvement in this case is that banks that are not masked will now be
> > skipped.
> >
> > Cc: Masahiro Yamada <[email-masked]>
> > Signed-off-by: William Breathitt Gray <[email-masked]>
> > ---
> >  drivers/gpio/gpio-uniphier.c | 16 ++++++----------
> >  1 file changed, 6 insertions(+), 10 deletions(-)
> >
> > diff --git a/drivers/gpio/gpio-uniphier.c b/drivers/gpio/gpio-uniphier.c
> > index 93cdcc41e9fb..3e4b15d0231e 100644
> > --- a/drivers/gpio/gpio-uniphier.c
> > +++ b/drivers/gpio/gpio-uniphier.c
> > @@ -15,9 +15,6 @@
> >  #include <linux/spinlock.h>
> >  #include <dt-bindings/gpio/uniphier-gpio.h>
> >
> > -#define UNIPHIER_GPIO_BANK_MASK                \
> > -                               GENMASK((UNIPHIER_GPIO_LINES_PER_BANK) - 1, 0)
> > -
> >  #define UNIPHIER_GPIO_IRQ_MAX_NUM      24
> >
> >  #define UNIPHIER_GPIO_PORT_DATA                0x0     /* data */
> > @@ -147,15 +144,14 @@ static void uniphier_gpio_set(struct gpio_chip *chip,
> >  static void uniphier_gpio_set_multiple(struct gpio_chip *chip,
> >                                        unsigned long *mask, unsigned long *bits)
> >  {
> > -       unsigned int bank, shift, bank_mask, bank_bits;
> > -       int i;
> > +       unsigned long i;
> > +       unsigned long bank_mask;
> > +       unsigned long bank;
> > +       unsigned long bank_bits;
> 
> 
> Please do not split it into multiple lines
> unless you need to do so.
> 
> Thanks.

No problem, I'll update this patch to declare them all on the same line.

William Breathitt Gray

> > -       for (i = 0; i < chip->ngpio; i += UNIPHIER_GPIO_LINES_PER_BANK) {
> > +       for_each_set_clump8(i, bank_mask, mask, chip->ngpio) {
> >                 bank = i / UNIPHIER_GPIO_LINES_PER_BANK;
> > -               shift = i % BITS_PER_LONG;
> > -               bank_mask = (mask[BIT_WORD(i)] >> shift) &
> > -                                               UNIPHIER_GPIO_BANK_MASK;
> > -               bank_bits = bits[BIT_WORD(i)] >> shift;
> > +               bank_bits = bitmap_get_value8(bits, i);
> >
> >                 uniphier_gpio_bank_write(chip, bank, UNIPHIER_GPIO_PORT_DATA,
> >                                          bank_mask, bank_bits);
> > --
> > 2.23.0
> >
> 
> 
> -- 
> Best Regards
> Masahiro Yamada

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