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[spibus] implement maximum clock frequency lookup from ofw.

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Obtained from:	loos
This commit is contained in:
Adrian Chadd 2016-05-26 06:37:33 +00:00
parent 63b92359c1
commit 055486964b
1 changed files with 10 additions and 1 deletions
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11
sys/dev/spibus/ofw_spibus.c
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@ -78,7 +78,7 @@ ofw_spibus_attach(device_t dev)
struct spibus_softc *sc = device_get_softc(dev);
struct ofw_spibus_devinfo *dinfo;
phandle_t child;
pcell_t paddr;
pcell_t clock, paddr;
device_t childdev;
sc->dev = dev;
@ -102,6 +102,14 @@ ofw_spibus_attach(device_t dev)
continue;
}
/*
* Get the maximum clock frequency for device, zero means
* use the default bus speed.
*/
if (OF_getencprop(child, "spi-max-frequency", &clock,
sizeof(clock)) == -1)
clock = 0;
/*
* Now set up the SPI and OFW bus layer devinfo and add it
* to the bus.
@ -111,6 +119,7 @@ ofw_spibus_attach(device_t dev)
if (dinfo == NULL)
continue;
dinfo->opd_dinfo.cs = paddr;
dinfo->opd_dinfo.clock = clock;
if (ofw_bus_gen_setup_devinfo(&dinfo->opd_obdinfo, child) !=
0) {
free(dinfo, M_DEVBUF);