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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:
Sascha Hauer 2013-05-30 16:31:14 +02:00
parent 0ea008e15b
commit ea9c911b8f
2 changed files with 39 additions and 0 deletions
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38
drivers/mci/mci-core.c
View File

@ -1671,3 +1671,41 @@ err_free:
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);
}

1
include/mci.h
View File

@ -363,6 +363,7 @@ struct mci {
};
int mci_register(struct mci_host*);
void mci_of_parse(struct mci_host *host);
int mci_detect_card(struct mci_host *);
#endif /* _MCI_H_ */