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Correctly handle nodes compatible with "syscon", "simple-bus".

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Syscon can also have child nodes that share a registration file with it.
To do this correctly, follow these steps:
- subclass syscon from simplebus and expose it if the node is also
  "simple-bus" compatible.
- block simplebus probe for this compatible string, so it's priority
 (bus pass) doesn't colide with syscon driver.

While I'm in, also block "syscon", "simple-mfd" for the same reason.

MFC after:	4 weeks
This commit is contained in:
mmel 2020-09-25 13:52:31 +00:00
parent 15ceb7403d
commit 4fb039b8f7
3 changed files with 32 additions and 6 deletions
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24
sys/dev/extres/syscon/syscon_generic.c
View File

@ -60,7 +60,7 @@ static int syscon_generic_write_4(struct syscon *syscon, bus_size_t offset,
uint32_t val);
static int syscon_generic_modify_4(struct syscon *syscon, bus_size_t offset,
uint32_t clear_bits, uint32_t set_bits);
static int syscon_generic_detach(device_t dev);
/*
* Generic syscon driver (FDT)
*/
@ -152,7 +152,7 @@ static int
syscon_generic_attach(device_t dev)
{
struct syscon_generic_softc *sc;
int rid;
int rid, rv;
sc = device_get_softc(dev);
sc->dev = dev;
@ -170,9 +170,20 @@ syscon_generic_attach(device_t dev)
ofw_bus_get_node(dev));
if (sc->syscon == NULL) {
device_printf(dev, "Failed to create/register syscon\n");
syscon_generic_detach(dev);
return (ENXIO);
}
return (0);
if (ofw_bus_is_compatible(dev, "simple-bus")) {
rv = simplebus_attach_impl(sc->dev);
if (rv != 0) {
device_printf(dev, "Failed to create simplebus\n");
syscon_generic_detach(dev);
return (ENXIO);
}
sc->simplebus_attached = true;
}
return (bus_generic_attach(dev));
}
static int
@ -185,7 +196,8 @@ syscon_generic_detach(device_t dev)
syscon_unregister(sc->syscon);
free(sc->syscon, M_SYSCON);
}
if (sc->simplebus_attached)
simplebus_detach(dev);
SYSCON_LOCK_DESTROY(sc);
if (sc->mem_res != NULL)
@ -202,8 +214,8 @@ static device_method_t syscon_generic_dmethods[] = {
DEVMETHOD_END
};
DEFINE_CLASS_0(syscon_generic, syscon_generic_driver, syscon_generic_dmethods,
sizeof(struct syscon_generic_softc));
DEFINE_CLASS_1(syscon_generic_dev, syscon_generic_driver, syscon_generic_dmethods,
sizeof(struct syscon_generic_softc), simplebus_driver);
static devclass_t syscon_generic_devclass;
EARLY_DRIVER_MODULE(syscon_generic, simplebus, syscon_generic_driver,

4
sys/dev/extres/syscon/syscon_generic.h
View File

@ -29,11 +29,15 @@
#ifndef DEV_SYSCON_GENERIC_H
#define DEV_SYSCON_GENERIC_H
#include <dev/fdt/simplebus.h>
struct syscon_generic_softc {
struct simplebus_softc simplebus;
device_t dev;
struct syscon *syscon;
struct resource *mem_res;
struct mtx mtx;
bool simplebus_attached;
};
DECLARE_CLASS(syscon_generic_driver);

10
sys/dev/fdt/simplebus.c
View File

@ -116,6 +116,16 @@ simplebus_probe(device_t dev)
if (!ofw_bus_status_okay(dev))
return (ENXIO);
/*
* XXX We should attach only to pure' compatible = "simple-bus"',
* without any other compatible string.
* For now, filter only know cases:
* "syscon", "simple-bus"; is handled by fdt/syscon driver
* "simple-mfd", "simple-bus"; is handled by fdt/simple-mfd driver
*/
if (ofw_bus_is_compatible(dev, "syscon") ||
ofw_bus_is_compatible(dev, "simple-mfd"))
return (ENXIO);
/*
* FDT data puts a "simple-bus" compatible string on many things that