gpiolib: Pass bitmaps, not integer arrays, to get/set array

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@lwn.net>
Cc: Miguel Ojeda Sandonis <miguel.ojeda.sandonis@gmail.com>
Cc: Sebastien Bourdelin <sebastien.bourdelin@savoirfairelinux.com>
Cc: Lukas Wunner <lukas@wunner.de>
Cc: Peter Korsgaard <peter.korsgaard@barco.com>
Cc: Peter Rosin <peda@axentia.se>
Cc: Andrew Lunn <andrew@lunn.ch>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Rojhalat Ibrahim <imr@rtschenk.de>
Cc: Dominik Brodowski <linux@dominikbrodowski.net>
Cc: Russell King <rmk+kernel@armlinux.org.uk>
Cc: Kishon Vijay Abraham I <kishon@ti.com>
Cc: Tony Lindgren <tony@atomide.com>
Cc: Lars-Peter Clausen <lars@metafoo.de>
Cc: Michael Hennerich <Michael.Hennerich@analog.com>
Cc: Jonathan Cameron <jic23@kernel.org>
Cc: Hartmut Knaack <knaack.h@gmx.de>
Cc: Peter Meerwald-Stadler <pmeerw@pmeerw.net>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jiri Slaby <jslaby@suse.com>
Cc: Yegor Yefremov <yegorslists@googlemail.com>
Cc: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Janusz Krzysztofik <jmkrzyszt@gmail.com>
Acked-by: Ulf Hansson <ulf.hansson@linaro.org>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Tested-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

1 files changed, 4 insertions, 11 deletions

diff --git a/drivers/bus/ts-nbus.c b/drivers/bus/ts-nbus.c
index 073fd9011154..8dde7c77f62c 100644
--- a/drivers/bus/ts-nbus.c
+++ b/drivers/bus/ts-nbus.c
@@ -110,11 +110,9 @@ static void ts_nbus_set_direction(struct ts_nbus *ts_nbus, int direction)
  */
 static void ts_nbus_reset_bus(struct ts_nbus *ts_nbus)
 {
-	int i;
-	int values[8];
+	DECLARE_BITMAP(values, 8);
 
-	for (i = 0; i < 8; i++)
-		values[i] = 0;
+	values[0] = 0;
 
 	gpiod_set_array_value_cansleep(8, ts_nbus->data->desc, values);
 	gpiod_set_value_cansleep(ts_nbus->csn, 0);
@@ -157,14 +155,9 @@ static int ts_nbus_read_byte(struct ts_nbus *ts_nbus, u8 *val)
 static void ts_nbus_write_byte(struct ts_nbus *ts_nbus, u8 byte)
 {
 	struct gpio_descs *gpios = ts_nbus->data;
-	int i;
-	int values[8];
+	DECLARE_BITMAP(values, 8);
 
-	for (i = 0; i < 8; i++)
-		if (byte & BIT(i))
-			values[i] = 1;
-		else
-			values[i] = 0;
+	values[0] = byte;
 
 	gpiod_set_array_value_cansleep(8, gpios->desc, values);
 }