mci: Add devicetree helper function
This adds helper code to parse the bus-width and max-frequency property from devicetree. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
parent
0ea008e15b
commit
ea9c911b8f
|
@ -1671,3 +1671,41 @@ err_free:
|
||||||
|
|
||||||
return ret;
|
return ret;
|
||||||
}
|
}
|
||||||
|
|
||||||
|
void mci_of_parse(struct mci_host *host)
|
||||||
|
{
|
||||||
|
struct device_node *np;
|
||||||
|
u32 bus_width;
|
||||||
|
|
||||||
|
if (!IS_ENABLED(CONFIG_OFDEVICE))
|
||||||
|
return;
|
||||||
|
|
||||||
|
if (!host->hw_dev || !host->hw_dev->device_node)
|
||||||
|
return;
|
||||||
|
|
||||||
|
np = host->hw_dev->device_node;
|
||||||
|
|
||||||
|
/* "bus-width" is translated to MMC_CAP_*_BIT_DATA flags */
|
||||||
|
if (of_property_read_u32(np, "bus-width", &bus_width) < 0) {
|
||||||
|
dev_dbg(host->hw_dev,
|
||||||
|
"\"bus-width\" property is missing, assuming 1 bit.\n");
|
||||||
|
bus_width = 1;
|
||||||
|
}
|
||||||
|
|
||||||
|
switch (bus_width) {
|
||||||
|
case 8:
|
||||||
|
host->host_caps |= MMC_MODE_8BIT;
|
||||||
|
/* Hosts capable of 8-bit transfers can also do 4 bits */
|
||||||
|
case 4:
|
||||||
|
host->host_caps |= MMC_MODE_4BIT;
|
||||||
|
break;
|
||||||
|
case 1:
|
||||||
|
break;
|
||||||
|
default:
|
||||||
|
dev_err(host->hw_dev,
|
||||||
|
"Invalid \"bus-width\" value %ud!\n", bus_width);
|
||||||
|
}
|
||||||
|
|
||||||
|
/* f_max is obtained from the optional "max-frequency" property */
|
||||||
|
of_property_read_u32(np, "max-frequency", &host->f_max);
|
||||||
|
}
|
||||||
|
|
|
@ -363,6 +363,7 @@ struct mci {
|
||||||
};
|
};
|
||||||
|
|
||||||
int mci_register(struct mci_host*);
|
int mci_register(struct mci_host*);
|
||||||
|
void mci_of_parse(struct mci_host *host);
|
||||||
int mci_detect_card(struct mci_host *);
|
int mci_detect_card(struct mci_host *);
|
||||||
|
|
||||||
#endif /* _MCI_H_ */
|
#endif /* _MCI_H_ */
|
||||||
|
|
Loading…
Reference in New Issue