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nmhw24: configure com/io shield gpios in dtb 

when a COM/IO shield is detected, its two IOs
are given names in the gpio section so that they
are accessible from Linux gpio chardev.

BugzId: 60150
This commit is contained in:
Rene Straub 2019-11-16 13:17:11 +01:00
parent 1ada49ca8c
commit 0cde66a780
1 changed files with 50 additions and 1 deletions
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51
board/nm/nrhw24/board.c
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@ -889,7 +889,7 @@ static void blink_led(int pulses)
{
const int pulse_width = 400*1000; /* 400ms */
/* Assumed status led on, indicator off */
/* Assumes status led on, indicator off */
set_status_led(0, 0);
while (pulses) {
@ -1142,6 +1142,54 @@ static void ft_enable_node(void* blob, const char* name)
}
}
/*
* Modify the name of a gpio in a gpio-line-names string list.
*/
static void ft_set_gpio_name(void *blob, const char* gpio, int pin, const char* name)
{
int node_ofs = fdt_path_offset(blob, gpio);
if (node_ofs != -1) {
const struct fdt_property* prop = fdt_get_property(blob, node_ofs, "gpio-line-names", NULL);
if (prop != NULL) {
const char* text;
int pos = 0;
int i;
char buffer[512];
/* TODO: Determine number of entries from ngpios field */
for (i=0; i<32; i++) {
if (i == pin) {
/* Take provided name if GPIO pin is matched */
text = name;
}
else {
/* Take existing name from strin list */
(void)fdt_get_string_index(blob, node_ofs, "gpio-line-names", i, &text);
}
/* Add name to new string list */
strncpy(buffer+pos, text, sizeof(buffer)-pos);
pos += strlen(text) + 1;
printf(" %d %d %s\n", i, pos, text);
}
(void)fdt_setprop(blob, node_ofs, "gpio-line-names", buffer, pos);
}
}
}
/*
* Enable digital IOs provided by COM/IO shield in gpio nodes
*/
static void ft_comio_gpios(void *blob)
{
/* gpio0_7: COM/IO relay output */
ft_set_gpio_name(blob, "/ocp/gpio@44e07000", 7, "COMIO_OUT0");
/* gpio1_8: COM/IO digital input */
ft_set_gpio_name(blob, "/ocp/gpio@4804c000", 8, "COMIO_IN0");
}
static void ft_shields(void* blob)
{
int shield_type = -1;
@ -1149,6 +1197,7 @@ static void ft_shields(void* blob)
shield_type = bd_get_shield(0);
switch (shield_type) {
case SHIELD_COM_IO:
ft_comio_gpios(blob);
ft_enable_node(blob, "/netbox_dio_comio");
/* TODO: Should use alias serial0 */
ft_enable_node(blob, "/ocp/serial@44e09000");