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gpio: Show inactive GPIOs when explicitly requested

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At present the gpio command only shows GPIOs which are marked as in use.
This makes sense with 'gpio status' since we already have the '-a' flag
to indicate that all GPIOs should be shown. But when a particular GPIO is
requested, it seems better to always display it. At present the request is
simply ignored.

For example if GPIO a10 is not in use, then:

   > gpio status a10

shows nothing, not even the function being used for that GPIO. With this
change, it shows the pin status:

   > gpio status a10
   a10: input: 0 [ ]

Add an extra parameter for this to avoid changing the existing flag
parameter.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Tested-by: Bin Meng <bmeng.cn@gmail.com>
[bmeng: correct the 'gpio' command in the commit message]
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Simon Glass 2019-02-16 20:24:42 -07:00 committed by Bin Meng
parent 7d38db55f7
commit b8989b537e
1 changed files with 4 additions and 4 deletions
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8
cmd/gpio.c
View file

@ -34,7 +34,7 @@ enum {
};
static void gpio_get_description(struct udevice *dev, const char *bank_name,
int offset, int *flagsp)
int offset, int *flagsp, bool show_all)
{
char buf[80];
int ret;
@ -42,7 +42,7 @@ static void gpio_get_description(struct udevice *dev, const char *bank_name,
ret = gpio_get_function(dev, offset, NULL);
if (ret < 0)
goto err;
if (!(*flagsp & FLAG_SHOW_ALL) && ret == GPIOF_UNUSED)
if (!show_all && !(*flagsp & FLAG_SHOW_ALL) && ret == GPIOF_UNUSED)
return;
if ((*flagsp & FLAG_SHOW_BANK) && bank_name) {
if (*flagsp & FLAG_SHOW_NEWLINE) {
@ -98,11 +98,11 @@ static int do_gpio_status(bool all, const char *gpio_name)
if (gpio_name && *p) {
offset = simple_strtoul(p, NULL, 10);
gpio_get_description(dev, bank_name, offset,
&flags);
&flags, true);
} else {
for (offset = 0; offset < num_bits; offset++) {
gpio_get_description(dev, bank_name,
offset, &flags);
offset, &flags, false);
}
}
}