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bus: ti-sysc: Probe for l4_wkup and l4_cfg interconnect devices first

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We want to probe l4_wkup and l4_cfg interconnect devices first to avoid
issues with missing resources. Otherwise we attempt to probe l4_per
devices first causing pointless deferred probe and also annoyingh
renumbering of the MMC devices for example.

Signed-off-by: Tony Lindgren <tony@atomide.com>
This commit is contained in:
Tony Lindgren 2021-03-08 11:35:07 +02:00
parent 7bad5af826
commit 4700a00755
1 changed files with 49 additions and 0 deletions
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49
drivers/bus/ti-sysc.c
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@ -635,6 +635,51 @@ static int sysc_parse_and_check_child_range(struct sysc *ddata)
return 0;
}
/* Interconnect instances to probe before l4_per instances */
static struct resource early_bus_ranges[] = {
/* am3/4 l4_wkup */
{ .start = 0x44c00000, .end = 0x44c00000 + 0x300000, },
/* omap4/5 and dra7 l4_cfg */
{ .start = 0x4a000000, .end = 0x4a000000 + 0x300000, },
/* omap4 l4_wkup */
{ .start = 0x4a300000, .end = 0x4a300000 + 0x30000, },
/* omap5 and dra7 l4_wkup without dra7 dcan segment */
{ .start = 0x4ae00000, .end = 0x4ae00000 + 0x30000, },
};
static atomic_t sysc_defer = ATOMIC_INIT(10);
/**
* sysc_defer_non_critical - defer non_critical interconnect probing
* @ddata: device driver data
*
* We want to probe l4_cfg and l4_wkup interconnect instances before any
* l4_per instances as l4_per instances depend on resources on l4_cfg and
* l4_wkup interconnects.
*/
static int sysc_defer_non_critical(struct sysc *ddata)
{
struct resource *res;
int i;
if (!atomic_read(&sysc_defer))
return 0;
for (i = 0; i < ARRAY_SIZE(early_bus_ranges); i++) {
res = &early_bus_ranges[i];
if (ddata->module_pa >= res->start &&
ddata->module_pa <= res->end) {
atomic_set(&sysc_defer, 0);
return 0;
}
}
atomic_dec_if_positive(&sysc_defer);
return -EPROBE_DEFER;
}
static struct device_node *stdout_path;
static void sysc_init_stdout_path(struct sysc *ddata)
@ -860,6 +905,10 @@ static int sysc_map_and_check_registers(struct sysc *ddata)
if (error)
return error;
error = sysc_defer_non_critical(ddata);
if (error)
return error;
sysc_check_children(ddata);
if (!of_get_property(np, "reg", NULL))