@@ -60,6 +60,15 @@ Optional SDIO properties:
- keep-power-in-suspend: Preserves card power during a suspend/resume cycle
- enable-sdio-wakeup: Enables wake up of host system on SDIO IRQ assertion
+Function subnodes:
+On embedded systems the cards connected to a host may need additional properties.
+These can be specified in subnodes to the host controller node. The subnodes are
+identified by the standard 'reg' property.
+Required properties:
+- reg: Must contain the SDIO function number of the function this subnode describes.
+ A value of 0 denotes the memory SD function, values from 1 to 7 denote the
+ SDIO functions.
+
Example:
sdhci@ab000000 {
@@ -74,3 +83,24 @@ sdhci@ab000000 {
keep-power-in-suspend;
enable-sdio-wakeup;
}
+
+Example with SDIO subnode:
+
+sdhci@ab000000 {
+ compatible = "sdhci";
+ reg = <0xab000000 0x200>;
+ interrupts = <23>;
+ bus-width = <4>;
+ cd-gpios = <&gpio 69 0>;
+ cd-inverted;
+ wp-gpios = <&gpio 70 0>;
+ max-frequency = <50000000>;
+ keep-power-in-suspend;
+ enable-sdio-wakeup;
+
+ func@2 {
+ reg = <2>;
+ reset-gpios = <&gpio 69 0>;
+ clock-frequency = <26000000>;
+ };
+}
@@ -16,6 +16,7 @@
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/stat.h>
+#include <linux/of.h>
#include <linux/pm_runtime.h>
#include <linux/mmc/card.h>
@@ -289,6 +290,16 @@ struct mmc_card *mmc_alloc_card(struct mmc_host *host, struct device_type *type)
return card;
}
+static void mmc_set_of_node(struct mmc_card *card)
+{
+ struct mmc_host *host = card->host;
+
+ if (!host->parent->of_node)
+ return;
+
+ card->dev.of_node = mmc_of_find_child_device(host->parent->of_node, 0);
+}
+
/*
* Register a new MMC card with the driver model.
*/
@@ -359,6 +370,8 @@ int mmc_add_card(struct mmc_card *card)
#endif
mmc_init_context_info(card->host);
+ mmc_set_of_node(card);
+
ret = device_add(&card->dev);
if (ret)
return ret;
@@ -387,6 +400,7 @@ void mmc_remove_card(struct mmc_card *card)
mmc_hostname(card->host), card->rca);
}
device_del(&card->dev);
+ of_node_put(card->dev.of_node);
}
put_device(&card->dev);
@@ -1201,6 +1201,31 @@ EXPORT_SYMBOL(mmc_of_parse_voltage);
#endif /* CONFIG_OF */
+static int mmc_of_get_func_num(struct device_node *node)
+{
+ u32 reg;
+ int ret;
+
+ ret = of_property_read_u32(node, "reg", ®);
+ if (ret < 0)
+ return ret;
+
+ return reg;
+}
+
+struct device_node *mmc_of_find_child_device(struct device_node *parent,
+ unsigned func_num)
+{
+ struct device_node *node;
+
+ for_each_child_of_node(parent, node) {
+ if (mmc_of_get_func_num(node) == func_num)
+ return node;
+ }
+
+ return NULL;
+}
+
#ifdef CONFIG_REGULATOR
/**
@@ -32,6 +32,9 @@ struct mmc_bus_ops {
void mmc_attach_bus(struct mmc_host *host, const struct mmc_bus_ops *ops);
void mmc_detach_bus(struct mmc_host *host);
+struct device_node *mmc_of_find_child_device(struct device_node *parent,
+ unsigned func_num);
+
void mmc_init_erase(struct mmc_card *card);
void mmc_set_chip_select(struct mmc_host *host, int mode);
@@ -22,6 +22,7 @@
#include <linux/mmc/host.h>
#include <linux/mmc/sdio_func.h>
+#include "core.h"
#include "sdio_cis.h"
#include "sdio_bus.h"
@@ -314,6 +315,19 @@ static void sdio_acpi_set_handle(struct sdio_func *func)
static inline void sdio_acpi_set_handle(struct sdio_func *func) {}
#endif
+#include <linux/of.h>
+
+void sdio_set_of_node(struct sdio_func *func)
+{
+ struct mmc_host *host = func->card->host;
+
+ if (!host->parent->of_node)
+ return;
+
+ func->dev.of_node = mmc_of_find_child_device(host->parent->of_node,
+ func->num);
+}
+
/*
* Register a new SDIO function with the driver model.
*/
@@ -323,6 +337,7 @@ int sdio_add_func(struct sdio_func *func)
dev_set_name(&func->dev, "%s:%d", mmc_card_id(func->card), func->num);
+ sdio_set_of_node(func);
sdio_acpi_set_handle(func);
ret = device_add(&func->dev);
if (ret == 0) {
@@ -346,6 +361,7 @@ void sdio_remove_func(struct sdio_func *func)
acpi_dev_pm_detach(&func->dev, false);
device_del(&func->dev);
+ of_node_put(func->dev.of_node);
put_device(&func->dev);
}