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authorSascha Hauer <s.hauer@pengutronix.de>2013-05-30 16:31:14 +0200
committerSascha Hauer <s.hauer@pengutronix.de>2013-05-31 18:19:11 +0200
commitea9c911b8f2d72aa076295f4a828597a3ce163de (patch)
tree8680867b78d005d55db1016e69d9fa4744387ce1 /drivers/mci/mci-core.c
parent0ea008e15b4ccd8a27e4e23d3ce0466f69e7ed24 (diff)
downloadbarebox-ea9c911b8f2d72aa076295f4a828597a3ce163de.tar.gz
barebox-ea9c911b8f2d72aa076295f4a828597a3ce163de.tar.xz
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>
Diffstat (limited to 'drivers/mci/mci-core.c')
-rw-r--r--drivers/mci/mci-core.c38
1 files changed, 38 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);
+}