make bitbang_interface const

Change-Id: I5e187250d231aeefc7a206b7f7917c3b2e858d5a
Signed-off-by: R. Diez <rdiezmail-openocd@yahoo.de>
Reviewed-on: https://review.openocd.org/c/openocd/+/8535
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>
Tested-by: jenkins

src/jtag/drivers/am335xgpio.c

@@ -283,7 +283,7 @@ static int am335xgpio_blink(bool on)
 	return ERROR_OK;
 }
 
-static struct bitbang_interface am335xgpio_bitbang = {
+static const struct bitbang_interface am335xgpio_bitbang = {
 	.read = am335xgpio_read,
 	.write = am335xgpio_write,
 	.swdio_read = am335xgpio_swdio_read,

src/jtag/drivers/at91rm9200.c

@@ -104,7 +104,7 @@ static int at91rm9200_write(int tck, int tms, int tdi);
 static int at91rm9200_init(void);
 static int at91rm9200_quit(void);
 
-static struct bitbang_interface at91rm9200_bitbang = {
+static const struct bitbang_interface at91rm9200_bitbang = {
 	.read = at91rm9200_read,
 	.write = at91rm9200_write,
 	.blink = NULL,

src/jtag/drivers/bitbang.c

@@ -37,7 +37,7 @@ static int bitbang_stableclocks(unsigned int num_cycles);
 
 static void bitbang_swd_write_reg(uint8_t cmd, uint32_t value, uint32_t ap_delay_clk);
 
-struct bitbang_interface *bitbang_interface;
+const struct bitbang_interface *bitbang_interface;
 
 /* DANGER!!!! clock absolutely *MUST* be 0 in idle or reset won't work!
  *

src/jtag/drivers/bitbang.h

@@ -67,6 +67,6 @@ extern const struct swd_driver bitbang_swd;
 
 int bitbang_execute_queue(struct jtag_command *cmd_queue);
 
-extern struct bitbang_interface *bitbang_interface;
+extern const struct bitbang_interface *bitbang_interface;
 
 #endif /* OPENOCD_JTAG_DRIVERS_BITBANG_H */

src/jtag/drivers/dummy.c

@@ -77,7 +77,7 @@ static int dummy_led(bool on)
 	return ERROR_OK;
 }
 
-static struct bitbang_interface dummy_bitbang = {
+static const struct bitbang_interface dummy_bitbang = {
 		.read = &dummy_read,
 		.write = &dummy_write,
 		.blink = &dummy_led,

src/jtag/drivers/ep93xx.c

@@ -55,7 +55,7 @@ struct adapter_driver ep93xx_adapter_driver = {
 	.jtag_ops = &ep93xx_interface,
 };
 
-static struct bitbang_interface ep93xx_bitbang = {
+static const struct bitbang_interface ep93xx_bitbang = {
 	.read = ep93xx_read,
 	.write = ep93xx_write,
 	.blink = NULL,

src/jtag/drivers/imx_gpio.c

@@ -82,7 +82,7 @@ static int imx_gpio_swd_write(int swclk, int swdio);
 static int imx_gpio_init(void);
 static int imx_gpio_quit(void);
 
-static struct bitbang_interface imx_gpio_bitbang = {
+static const struct bitbang_interface imx_gpio_bitbang = {
 	.read = imx_gpio_read,
 	.write = imx_gpio_write,
 	.swdio_read = imx_gpio_swdio_read,

src/jtag/drivers/linuxgpiod.c

@@ -191,7 +191,7 @@ static int linuxgpiod_blink(bool on)
 	return retval;
 }
 
-static struct bitbang_interface linuxgpiod_bitbang = {
+static const struct bitbang_interface linuxgpiod_bitbang = {
 	.read = linuxgpiod_read,
 	.write = linuxgpiod_write,
 	.swdio_read = linuxgpiod_swdio_read,

src/jtag/drivers/parport.c

@@ -255,7 +255,7 @@ static int parport_get_giveio_access(void)
 }
 #endif
 
-static struct bitbang_interface parport_bitbang = {
+static const struct bitbang_interface parport_bitbang = {
 	.read = &parport_read,
 	.write = &parport_write,
 	.blink = &parport_led,

src/jtag/drivers/remote_bitbang.c

@@ -278,7 +278,7 @@ static int remote_bitbang_swd_write(int swclk, int swdio)
 	return remote_bitbang_queue(c, NO_FLUSH);
 }
 
-static struct bitbang_interface remote_bitbang_bitbang = {
+static const struct bitbang_interface remote_bitbang_bitbang = {
 	.buf_size = sizeof(remote_bitbang_recv_buf) - 1,
 	.sample = &remote_bitbang_sample,
 	.read_sample = &remote_bitbang_read_sample,

src/jtag/drivers/sysfsgpio.c

@@ -565,7 +565,7 @@ struct adapter_driver sysfsgpio_adapter_driver = {
 	.swd_ops = &bitbang_swd,
 };
 
-static struct bitbang_interface sysfsgpio_bitbang = {
+static const struct bitbang_interface sysfsgpio_bitbang = {
 	.read = sysfsgpio_read,
 	.write = sysfsgpio_write,
 	.swdio_read = sysfsgpio_swdio_read,