devicetrees may have a linux,stdout-path property in the chosen
node describing the console device. This adds a helper function
to match a device against this property so a driver can call
add_preferred_console for a matching device.
Signed-off-by: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
---
drivers/of/Kconfig | 3 +++
drivers/of/Makefile | 1 +
drivers/of/of_stdout.c | 27 +++++++++++++++++++++++++++
include/linux/of_stdout.h | 24 ++++++++++++++++++++++++
4 files changed, 55 insertions(+)
create mode 100644 drivers/of/of_stdout.c
create mode 100644 include/linux/of_stdout.h
diff --git a/drivers/of/Kconfig b/drivers/of/Kconfig
index dfba3e6..8574ebb 100644
--- a/drivers/of/Kconfig
+++ b/drivers/of/Kconfig
@@ -67,6 +67,9 @@ config OF_MDIO
help
OpenFirmware MDIO bus (Ethernet PHY) accessors
+config OF_STDOUT
+ def_bool y
+
config OF_PCI
def_tristate PCI
depends on PCI
diff --git a/drivers/of/Makefile b/drivers/of/Makefile
index e027f44..c9f3f2f 100644
--- a/drivers/of/Makefile
+++ b/drivers/of/Makefile
@@ -8,6 +8,7 @@ obj-$(CONFIG_OF_I2C) += of_i2c.o
obj-$(CONFIG_OF_NET) += of_net.o
obj-$(CONFIG_OF_SELFTEST) += selftest.o
obj-$(CONFIG_OF_MDIO) += of_mdio.o
+obj-$(CONFIG_OF_STDOUT) += of_stdout.o
obj-$(CONFIG_OF_PCI) += of_pci.o
obj-$(CONFIG_OF_PCI_IRQ) += of_pci_irq.o
obj-$(CONFIG_OF_MTD) += of_mtd.o
diff --git a/drivers/of/of_stdout.c b/drivers/of/of_stdout.c
new file mode 100644
index 0000000..c9e370e
--- /dev/null
+++ b/drivers/of/of_stdout.c
@@ -0,0 +1,27 @@
+/*
+ * OF helper for linux,stdoutpath property.
+ *
+ * This file is released under the GPLv2
+ */
+#include <linux/of_stdout.h>
+
+/**
+ * of_device_is_stdout_path - check if a device node matches the
+ * linux,stdout-path property
+ *
+ * Check if this device node matches the linux,stdout-path property
+ * in the chosen node. return true if yes, false otherwise.
+ */
+int of_device_is_stdout_path(struct device_node *dn)
+{
+ const char *name;
+
+ name = of_get_property(of_chosen, "linux,stdout-path", NULL);
+ if (name == NULL)
+ return 0;
+
+ if (dn == of_find_node_by_path(name))
+ return 1;
+
+ return 0;
+}
diff --git a/include/linux/of_stdout.h b/include/linux/of_stdout.h
new file mode 100644
index 0000000..0d80674
--- /dev/null
+++ b/include/linux/of_stdout.h
@@ -0,0 +1,24 @@
+/*
+ * OF helper for linux,stdoutpath property.
+ *
+ * This file is released under the GPLv2
+ */
+
+#ifndef __LINUX_OF_STDOUT_H
+#define __LINUX_OF_STDOUT_H
+
+#ifdef CONFIG_OF_STDOUT
+
+#include <linux/of.h>
+int of_device_is_stdout_path(struct device_node *dn);
+
+#else
+
+static inline int of_device_is_stdout_path(struct device_node *dn)
+{
+ return 0;
+}
+
+#endif
+
+#endif /* __LINUX_OF_STDOUT_H */
--
1.7.10.4
--
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