The mmc_of_parse will check the endian mode by finding whether
existing 'big-endian' property in device tree. The default endian
mode is little-endian if no 'big-endian' property specified.
Signed-off-by: Yangbo Lu <yangbo.lu@xxxxxxxxxxxxx>
---
Changes for v3:
- Moved endian mode checking to generic mmc host driver
---
Documentation/devicetree/bindings/mmc/mmc.txt | 2 ++
drivers/mmc/core/host.c | 2 ++
include/linux/mmc/host.h | 1 +
3 files changed, 5 insertions(+)
diff --git a/Documentation/devicetree/bindings/mmc/mmc.txt b/Documentation/devicetree/bindings/mmc/mmc.txt
index 438899e..e7980ad 100644
--- a/Documentation/devicetree/bindings/mmc/mmc.txt
+++ b/Documentation/devicetree/bindings/mmc/mmc.txt
@@ -42,6 +42,8 @@ Optional properties:
- mmc-hs400-1_2v: eMMC HS400 mode(1.2V I/O) is supported
- dsr: Value the card's (optional) Driver Stage Register (DSR) should be
programmed with. Valid range: [0 .. 0xffff].
+- big-endian: If the host controller is big-endian mode, specify this property.
+ The default endian mode is little-endian if no 'big-endian' property specified.
*NOTE* on CD and WP polarity. To use common for all SD/MMC host controllers line
polarity properties, we have to fix the meaning of the "normal" and "inverted"
diff --git a/drivers/mmc/core/host.c b/drivers/mmc/core/host.c
index 8be0df7..a3559b7 100644
--- a/drivers/mmc/core/host.c
+++ b/drivers/mmc/core/host.c
@@ -323,6 +323,8 @@ int mmc_of_parse(struct mmc_host *host)
np = host->parent->of_node;
+ host->big_endian_mode = of_device_is_big_endian(np);
+
/* "bus-width" is translated to MMC_CAP_*_BIT_DATA flags */
if (of_property_read_u32(np, "bus-width", &bus_width) < 0) {
dev_dbg(host->parent,
diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index b5bedae..bbb064f 100644
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -200,6 +200,7 @@ struct mmc_host {
struct device *parent;
struct device class_dev;
int index;
+ bool big_endian_mode;
const struct mmc_host_ops *ops;
struct mmc_pwrseq *pwrseq;
unsigned int f_min;
--
2.1.0.27.g96db324
--
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