Hi Janusz,
On Sun, Sep 2, 2018 at 2:01 PM Janusz Krzysztofik <jmkrzyszt@xxxxxxxxx> wrote:
> Most users of get/set array functions iterate consecutive bits of data,
> usually a single integer, while processing array of results obtained
> from, or building an array of values to be passed to those functions.
> Save time wasted on those iterations by changing the functions' API to
> accept bitmaps.
>
> All current users are updated as well.
>
> More benefits from the change are expected as soon as planned support
> for accepting/passing those bitmaps directly from/to respective GPIO
> chip callbacks if applicable is implemented.
>
> Cc: Jonathan Corbet <corbet@xxxxxxx>
> Cc: Miguel Ojeda Sandonis <miguel.ojeda.sandonis@xxxxxxxxx>
> Cc: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
> Cc: Sebastien Bourdelin <sebastien.bourdelin@xxxxxxxxxxxxxxxxxxxx>
> Cc: Lukas Wunner <lukas@xxxxxxxxx>
> Cc: Peter Korsgaard <peter.korsgaard@xxxxxxxxx>
> Cc: Peter Rosin <peda@xxxxxxxxxx>
> Cc: Andrew Lunn <andrew@xxxxxxx>
> Cc: Florian Fainelli <f.fainelli@xxxxxxxxx>
> Cc: "David S. Miller" <davem@xxxxxxxxxxxxx>
> Cc: Rojhalat Ibrahim <imr@xxxxxxxxxxx>
> Cc: Dominik Brodowski <linux@xxxxxxxxxxxxxxxxxxxx>
> Cc: Russell King <rmk+kernel@xxxxxxxxxxxxxxx>
> Cc: Kishon Vijay Abraham I <kishon@xxxxxx>
> Cc: Tony Lindgren <tony@xxxxxxxxxxx>
> Cc: Lars-Peter Clausen <lars@xxxxxxxxxx>
> Cc: Michael Hennerich <Michael.Hennerich@xxxxxxxxxx>
> Cc: Jonathan Cameron <jic23@xxxxxxxxxx>
> Cc: Hartmut Knaack <knaack.h@xxxxxx>
> Cc: Peter Meerwald-Stadler <pmeerw@xxxxxxxxxx>
> Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
> Cc: Jiri Slaby <jslaby@xxxxxxxx>
> Cc: Yegor Yefremov <yegorslists@xxxxxxxxxxxxxx>
> Cc: Uwe Kleine-König <u.kleine-koenig@xxxxxxxxxxxxxx>
> Signed-off-by: Janusz Krzysztofik <jmkrzyszt@xxxxxxxxx>
> Acked-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
> --- a/drivers/auxdisplay/hd44780.c
> +++ b/drivers/auxdisplay/hd44780.c
> @@ -62,17 +62,12 @@ static void hd44780_strobe_gpio(struct hd44780 *hd)
> /* write to an LCD panel register in 8 bit GPIO mode */
> static void hd44780_write_gpio8(struct hd44780 *hd, u8 val, unsigned int rs)
> {
> - int values[10]; /* for DATA[0-7], RS, RW */
> - unsigned int i, n;
> -
> - for (i = 0; i < 8; i++)
> - values[PIN_DATA0 + i] = !!(val & BIT(i));
> - values[PIN_CTRL_RS] = rs;
> - n = 9;
> - if (hd->pins[PIN_CTRL_RW]) {
> - values[PIN_CTRL_RW] = 0;
> - n++;
> - }
> + DECLARE_BITMAP(values, 10); /* for DATA[0-7], RS, RW */
> + unsigned int n;
> +
> + *values = val;
Given DECLARE_BITMAP() creates an array, the above line looks a bit funny now.
IMHO, either you use
unsigned long values;
values = val;
__assign_bit(8, &values, rs);
or
DECLARE_BITMAP(values, 10);
values[0] = val;
__assign_bit(8, values, rs);
Nevertheless, for hd44780.c:
Reviewed-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
Tested-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
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