diff options
| -rw-r--r-- | drivers/mci/mci-core.c | 38 | ||||
| -rw-r--r-- | include/mci.h | 1 |
2 files changed, 39 insertions, 0 deletions
diff --git a/drivers/mci/mci-core.c b/drivers/mci/mci-core.c index 50068a7741..ce568df706 100644 --- a/drivers/mci/mci-core.c +++ b/drivers/mci/mci-core.c @@ -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); +} diff --git a/include/mci.h b/include/mci.h index eb8a195d53..bca374a8bf 100644 --- a/include/mci.h +++ b/include/mci.h @@ -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_ */ |