[PATCH v4] linux,stdout-path helper

[PATCH v4] linux,stdout-path helper

[Sascha Hauer]

The following adds a helper for matching the linux,stdout-path property
in the chosen node and makes use of it in the i.MX serial driver.

changes since v3:

- move code from separate files to drivers/of/base.c and include/linux/of.h

changes since v2:

- move helper to OF core and make it independent of serial devices

changes since v1:

- move it out of the i.MX serial driver and make it generic for serial
  devices.

[PATCH v4] linux,stdout-path helper

[Sascha Hauer]

The following adds a helper for matching the linux,stdout-path property
in the chosen node and makes use of it in the i.MX serial driver.

changes since v3:

- move code from separate files to drivers/of/base.c and include/linux/of.h

changes since v2:

- move helper to OF core and make it independent of serial devices

changes since v1:

- move it out of the i.MX serial driver and make it generic for serial
  devices.

[PATCH 1/3] OF: Add helper for matching against linux,stdout-path

[Sascha Hauer]

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@pengutronix.de>
---
 drivers/of/base.c  |   28 ++++++++++++++++++++++++++++
 include/linux/of.h |    7 +++++++
 2 files changed, 35 insertions(+)

diff --git a/drivers/of/base.c b/drivers/of/base.c
index af3b22a..737feb8 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -1358,3 +1358,31 @@ const char *of_prop_next_string(struct property *prop, const char *cur)
 	return curv;
 }
 EXPORT_SYMBOL_GPL(of_prop_next_string);
+
+/**
+ * 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;
+	struct device_node *dn_stdout;
+	int is_stdout = 0;
+
+	name = of_get_property(of_chosen, "linux,stdout-path", NULL);
+	if (name == NULL)
+		return 0;
+
+	dn_stdout = of_find_node_by_path(name);
+
+	if (dn_stdout && dn_stdout == dn)
+		is_stdout = 1;
+
+	of_node_put(dn_stdout);
+
+	return is_stdout;
+}
+EXPORT_SYMBOL_GPL(of_device_is_stdout_path);
diff --git a/include/linux/of.h b/include/linux/of.h
index b4e50d5..5f857b5 100644
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -310,6 +310,8 @@ const char *of_prop_next_string(struct property *prop, const char *cur);
 		s;						\
 		s = of_prop_next_string(prop, s))
 
+int of_device_is_stdout_path(struct device_node *dn);
+
 #else /* CONFIG_OF */
 
 static inline const char* of_node_full_name(struct device_node *np)
@@ -437,6 +439,11 @@ static inline int of_machine_is_compatible(const char *compat)
 	return 0;
 }
 
+static inline int of_device_is_stdout_path(struct device_node *dn)
+{
+	return 0;
+}
+
 #define of_match_ptr(_ptr)	NULL
 #define of_match_node(_matches, _node)	NULL
 #define of_property_for_each_u32(np, propname, prop, p, u) \
-- 
1.7.10.4

[PATCH 1/3] OF: Add helper for matching against linux,stdout-path

[Sascha Hauer]

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@pengutronix.de>
---
 drivers/of/base.c  |   28 ++++++++++++++++++++++++++++
 include/linux/of.h |    7 +++++++
 2 files changed, 35 insertions(+)

diff --git a/drivers/of/base.c b/drivers/of/base.c
index af3b22a..737feb8 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -1358,3 +1358,31 @@ const char *of_prop_next_string(struct property *prop, const char *cur)
 	return curv;
 }
 EXPORT_SYMBOL_GPL(of_prop_next_string);
+
+/**
+ * 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;
+	struct device_node *dn_stdout;
+	int is_stdout = 0;
+
+	name = of_get_property(of_chosen, "linux,stdout-path", NULL);
+	if (name == NULL)
+		return 0;
+
+	dn_stdout = of_find_node_by_path(name);
+
+	if (dn_stdout && dn_stdout == dn)
+		is_stdout = 1;
+
+	of_node_put(dn_stdout);
+
+	return is_stdout;
+}
+EXPORT_SYMBOL_GPL(of_device_is_stdout_path);
diff --git a/include/linux/of.h b/include/linux/of.h
index b4e50d5..5f857b5 100644
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -310,6 +310,8 @@ const char *of_prop_next_string(struct property *prop, const char *cur);
 		s;						\
 		s = of_prop_next_string(prop, s))
 
+int of_device_is_stdout_path(struct device_node *dn);
+
 #else /* CONFIG_OF */
 
 static inline const char* of_node_full_name(struct device_node *np)
@@ -437,6 +439,11 @@ static inline int of_machine_is_compatible(const char *compat)
 	return 0;
 }
 
+static inline int of_device_is_stdout_path(struct device_node *dn)
+{
+	return 0;
+}
+
 #define of_match_ptr(_ptr)	NULL
 #define of_match_node(_matches, _node)	NULL
 #define of_property_for_each_u32(np, propname, prop, p, u) \
-- 
1.7.10.4

[PATCH 2/3] serial: i.MX: Make console support non optional

[Sascha Hauer]

Traditionally console support is optional for serial drivers. This
makes it non optional for the i.MX driver since it's not worth
asking questions for a feature virtually every user of this driver
wants to have.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
 drivers/tty/serial/Kconfig |   16 +---------------
 drivers/tty/serial/imx.c   |    8 +-------
 2 files changed, 2 insertions(+), 22 deletions(-)

diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
index 2a53be5..919b243 100644
--- a/drivers/tty/serial/Kconfig
+++ b/drivers/tty/serial/Kconfig
@@ -541,26 +541,12 @@ config SERIAL_IMX
 	bool "IMX serial port support"
 	depends on ARCH_MXC
 	select SERIAL_CORE
+	select SERIAL_CORE_CONSOLE
 	select RATIONAL
 	help
 	  If you have a machine based on a Motorola IMX CPU you
 	  can enable its onboard serial port by enabling this option.
 
-config SERIAL_IMX_CONSOLE
-	bool "Console on IMX serial port"
-	depends on SERIAL_IMX
-	select SERIAL_CORE_CONSOLE
-	help
-	  If you have enabled the serial port on the Motorola IMX
-	  CPU you can make it the console by answering Y to this option.
-
-	  Even if you say Y here, the currently visible virtual console
-	  (/dev/tty0) will still be used as the system console by default, but
-	  you can alter that using a kernel command line option such as
-	  "console=ttySA0". (Try "man bootparam" or see the documentation of
-	  your boot loader (lilo or loadlin) about how to pass options to the
-	  kernel at boot time.)
-
 config SERIAL_UARTLITE
 	tristate "Xilinx uartlite serial port support"
 	depends on PPC32 || MICROBLAZE || MFD_TIMBERDALE
diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index 5981912..07a8ca1 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -1192,7 +1192,6 @@ static struct uart_ops imx_pops = {
 
 static struct imx_port *imx_ports[UART_NR];
 
-#ifdef CONFIG_SERIAL_IMX_CONSOLE
 static void imx_console_putchar(struct uart_port *port, int ch)
 {
 	struct imx_port *sport = (struct imx_port *)port;
@@ -1348,11 +1347,6 @@ static struct console imx_console = {
 	.data		= &imx_reg,
 };
 
-#define IMX_CONSOLE	&imx_console
-#else
-#define IMX_CONSOLE	NULL
-#endif
-
 static struct uart_driver imx_reg = {
 	.owner          = THIS_MODULE,
 	.driver_name    = DRIVER_NAME,
@@ -1360,7 +1354,7 @@ static struct uart_driver imx_reg = {
 	.major          = SERIAL_IMX_MAJOR,
 	.minor          = MINOR_START,
 	.nr             = ARRAY_SIZE(imx_ports),
-	.cons           = IMX_CONSOLE,
+	.cons           = &imx_console,
 };
 
 static int serial_imx_suspend(struct platform_device *dev, pm_message_t state)
-- 
1.7.10.4

[PATCH 2/3] serial: i.MX: Make console support non optional

[Sascha Hauer]

Traditionally console support is optional for serial drivers. This
makes it non optional for the i.MX driver since it's not worth
asking questions for a feature virtually every user of this driver
wants to have.

Signed-off-by: Sascha Hauer <s.hauer-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
---
 drivers/tty/serial/Kconfig |   16 +---------------
 drivers/tty/serial/imx.c   |    8 +-------
 2 files changed, 2 insertions(+), 22 deletions(-)

diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
index 2a53be5..919b243 100644
--- a/drivers/tty/serial/Kconfig
+++ b/drivers/tty/serial/Kconfig
@@ -541,26 +541,12 @@ config SERIAL_IMX
 	bool "IMX serial port support"
 	depends on ARCH_MXC
 	select SERIAL_CORE
+	select SERIAL_CORE_CONSOLE
 	select RATIONAL
 	help
 	  If you have a machine based on a Motorola IMX CPU you
 	  can enable its onboard serial port by enabling this option.
 
-config SERIAL_IMX_CONSOLE
-	bool "Console on IMX serial port"
-	depends on SERIAL_IMX
-	select SERIAL_CORE_CONSOLE
-	help
-	  If you have enabled the serial port on the Motorola IMX
-	  CPU you can make it the console by answering Y to this option.
-
-	  Even if you say Y here, the currently visible virtual console
-	  (/dev/tty0) will still be used as the system console by default, but
-	  you can alter that using a kernel command line option such as
-	  "console=ttySA0". (Try "man bootparam" or see the documentation of
-	  your boot loader (lilo or loadlin) about how to pass options to the
-	  kernel at boot time.)
-
 config SERIAL_UARTLITE
 	tristate "Xilinx uartlite serial port support"
 	depends on PPC32 || MICROBLAZE || MFD_TIMBERDALE
diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index 5981912..07a8ca1 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -1192,7 +1192,6 @@ static struct uart_ops imx_pops = {
 
 static struct imx_port *imx_ports[UART_NR];
 
-#ifdef CONFIG_SERIAL_IMX_CONSOLE
 static void imx_console_putchar(struct uart_port *port, int ch)
 {
 	struct imx_port *sport = (struct imx_port *)port;
@@ -1348,11 +1347,6 @@ static struct console imx_console = {
 	.data		= &imx_reg,
 };
 
-#define IMX_CONSOLE	&imx_console
-#else
-#define IMX_CONSOLE	NULL
-#endif
-
 static struct uart_driver imx_reg = {
 	.owner          = THIS_MODULE,
 	.driver_name    = DRIVER_NAME,
@@ -1360,7 +1354,7 @@ static struct uart_driver imx_reg = {
 	.major          = SERIAL_IMX_MAJOR,
 	.minor          = MINOR_START,
 	.nr             = ARRAY_SIZE(imx_ports),
-	.cons           = IMX_CONSOLE,
+	.cons           = &imx_console,
 };
 
 static int serial_imx_suspend(struct platform_device *dev, pm_message_t state)
-- 
1.7.10.4

[PATCH 2/3] serial: i.MX: Make console support non optional

[Sascha Hauer]

Traditionally console support is optional for serial drivers. This
makes it non optional for the i.MX driver since it's not worth
asking questions for a feature virtually every user of this driver
wants to have.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
 drivers/tty/serial/Kconfig |   16 +---------------
 drivers/tty/serial/imx.c   |    8 +-------
 2 files changed, 2 insertions(+), 22 deletions(-)

diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
index 2a53be5..919b243 100644
--- a/drivers/tty/serial/Kconfig
+++ b/drivers/tty/serial/Kconfig
@@ -541,26 +541,12 @@ config SERIAL_IMX
 	bool "IMX serial port support"
 	depends on ARCH_MXC
 	select SERIAL_CORE
+	select SERIAL_CORE_CONSOLE
 	select RATIONAL
 	help
 	  If you have a machine based on a Motorola IMX CPU you
 	  can enable its onboard serial port by enabling this option.
 
-config SERIAL_IMX_CONSOLE
-	bool "Console on IMX serial port"
-	depends on SERIAL_IMX
-	select SERIAL_CORE_CONSOLE
-	help
-	  If you have enabled the serial port on the Motorola IMX
-	  CPU you can make it the console by answering Y to this option.
-
-	  Even if you say Y here, the currently visible virtual console
-	  (/dev/tty0) will still be used as the system console by default, but
-	  you can alter that using a kernel command line option such as
-	  "console=ttySA0". (Try "man bootparam" or see the documentation of
-	  your boot loader (lilo or loadlin) about how to pass options to the
-	  kernel at boot time.)
-
 config SERIAL_UARTLITE
 	tristate "Xilinx uartlite serial port support"
 	depends on PPC32 || MICROBLAZE || MFD_TIMBERDALE
diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index 5981912..07a8ca1 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -1192,7 +1192,6 @@ static struct uart_ops imx_pops = {
 
 static struct imx_port *imx_ports[UART_NR];
 
-#ifdef CONFIG_SERIAL_IMX_CONSOLE
 static void imx_console_putchar(struct uart_port *port, int ch)
 {
 	struct imx_port *sport = (struct imx_port *)port;
@@ -1348,11 +1347,6 @@ static struct console imx_console = {
 	.data		= &imx_reg,
 };
 
-#define IMX_CONSOLE	&imx_console
-#else
-#define IMX_CONSOLE	NULL
-#endif
-
 static struct uart_driver imx_reg = {
 	.owner          = THIS_MODULE,
 	.driver_name    = DRIVER_NAME,
@@ -1360,7 +1354,7 @@ static struct uart_driver imx_reg = {
 	.major          = SERIAL_IMX_MAJOR,
 	.minor          = MINOR_START,
 	.nr             = ARRAY_SIZE(imx_ports),
-	.cons           = IMX_CONSOLE,
+	.cons           = &imx_console,
 };
 
 static int serial_imx_suspend(struct platform_device *dev, pm_message_t state)
-- 
1.7.10.4

[PATCH 3/3] serial: i.MX: evaluate linux,stdout-path property

[Sascha Hauer]

devicetrees may have the linux,stdout-path property to specify the
console. This patch adds support to the i.MX serial driver for this.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
 drivers/tty/serial/imx.c |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index 07a8ca1..ac5a679 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -1419,6 +1419,9 @@ static int serial_imx_probe_dt(struct imx_port *sport,
 
 	sport->devdata = of_id->data;
 
+	if (of_device_is_stdout_path(np))
+		add_preferred_console(imx_reg.cons->name, sport->port.line, 0);
+
 	return 0;
 }
 #else
-- 
1.7.10.4

[PATCH 3/3] serial: i.MX: evaluate linux,stdout-path property

[Sascha Hauer]

devicetrees may have the linux,stdout-path property to specify the
console. This patch adds support to the i.MX serial driver for this.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
 drivers/tty/serial/imx.c |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index 07a8ca1..ac5a679 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -1419,6 +1419,9 @@ static int serial_imx_probe_dt(struct imx_port *sport,
 
 	sport->devdata = of_id->data;
 
+	if (of_device_is_stdout_path(np))
+		add_preferred_console(imx_reg.cons->name, sport->port.line, 0);
+
 	return 0;
 }
 #else
-- 
1.7.10.4

Re: [PATCH 1/3] OF: Add helper for matching against linux,stdout-path

[Jean-Christophe PLAGNIOL-VILLARD]

On 10:31 Thu 15 Nov     , Sascha Hauer wrote:
> 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.

I like it but I've an issue with it I cannot specify the option for

as example I need to set the uart at 38400n8 or 115200n8 regarless of wath the
booloader did

Best Regards,
J.
> 
> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
> ---
>  drivers/of/base.c  |   28 ++++++++++++++++++++++++++++
>  include/linux/of.h |    7 +++++++
>  2 files changed, 35 insertions(+)
> 
> diff --git a/drivers/of/base.c b/drivers/of/base.c
> index af3b22a..737feb8 100644
> --- a/drivers/of/base.c
> +++ b/drivers/of/base.c
> @@ -1358,3 +1358,31 @@ const char *of_prop_next_string(struct property *prop, const char *cur)
>  	return curv;
>  }
>  EXPORT_SYMBOL_GPL(of_prop_next_string);
> +
> +/**
> + * 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;
> +	struct device_node *dn_stdout;
> +	int is_stdout = 0;
> +
> +	name = of_get_property(of_chosen, "linux,stdout-path", NULL);
> +	if (name == NULL)
> +		return 0;
> +
> +	dn_stdout = of_find_node_by_path(name);
> +
> +	if (dn_stdout && dn_stdout == dn)
> +		is_stdout = 1;
> +
> +	of_node_put(dn_stdout);
> +
> +	return is_stdout;
> +}
> +EXPORT_SYMBOL_GPL(of_device_is_stdout_path);
> diff --git a/include/linux/of.h b/include/linux/of.h
> index b4e50d5..5f857b5 100644
> --- a/include/linux/of.h
> +++ b/include/linux/of.h
> @@ -310,6 +310,8 @@ const char *of_prop_next_string(struct property *prop, const char *cur);
>  		s;						\
>  		s = of_prop_next_string(prop, s))
>  
> +int of_device_is_stdout_path(struct device_node *dn);
> +
>  #else /* CONFIG_OF */
>  
>  static inline const char* of_node_full_name(struct device_node *np)
> @@ -437,6 +439,11 @@ static inline int of_machine_is_compatible(const char *compat)
>  	return 0;
>  }
>  
> +static inline int of_device_is_stdout_path(struct device_node *dn)
> +{
> +	return 0;
> +}
> +
>  #define of_match_ptr(_ptr)	NULL
>  #define of_match_node(_matches, _node)	NULL
>  #define of_property_for_each_u32(np, propname, prop, p, u) \
> -- 
> 1.7.10.4
> 
> _______________________________________________
> devicetree-discuss mailing list
> devicetree-discuss@lists.ozlabs.org
> https://lists.ozlabs.org/listinfo/devicetree-discuss

[PATCH 1/3] OF: Add helper for matching against linux,stdout-path

[Jean-Christophe PLAGNIOL-VILLARD]

On 10:31 Thu 15 Nov     , Sascha Hauer wrote:
> 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.

I like it but I've an issue with it I cannot specify the option for

as example I need to set the uart at 38400n8 or 115200n8 regarless of wath the
booloader did

Best Regards,
J.
> 
> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
> ---
>  drivers/of/base.c  |   28 ++++++++++++++++++++++++++++
>  include/linux/of.h |    7 +++++++
>  2 files changed, 35 insertions(+)
> 
> diff --git a/drivers/of/base.c b/drivers/of/base.c
> index af3b22a..737feb8 100644
> --- a/drivers/of/base.c
> +++ b/drivers/of/base.c
> @@ -1358,3 +1358,31 @@ const char *of_prop_next_string(struct property *prop, const char *cur)
>  	return curv;
>  }
>  EXPORT_SYMBOL_GPL(of_prop_next_string);
> +
> +/**
> + * 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;
> +	struct device_node *dn_stdout;
> +	int is_stdout = 0;
> +
> +	name = of_get_property(of_chosen, "linux,stdout-path", NULL);
> +	if (name == NULL)
> +		return 0;
> +
> +	dn_stdout = of_find_node_by_path(name);
> +
> +	if (dn_stdout && dn_stdout == dn)
> +		is_stdout = 1;
> +
> +	of_node_put(dn_stdout);
> +
> +	return is_stdout;
> +}
> +EXPORT_SYMBOL_GPL(of_device_is_stdout_path);
> diff --git a/include/linux/of.h b/include/linux/of.h
> index b4e50d5..5f857b5 100644
> --- a/include/linux/of.h
> +++ b/include/linux/of.h
> @@ -310,6 +310,8 @@ const char *of_prop_next_string(struct property *prop, const char *cur);
>  		s;						\
>  		s = of_prop_next_string(prop, s))
>  
> +int of_device_is_stdout_path(struct device_node *dn);
> +
>  #else /* CONFIG_OF */
>  
>  static inline const char* of_node_full_name(struct device_node *np)
> @@ -437,6 +439,11 @@ static inline int of_machine_is_compatible(const char *compat)
>  	return 0;
>  }
>  
> +static inline int of_device_is_stdout_path(struct device_node *dn)
> +{
> +	return 0;
> +}
> +
>  #define of_match_ptr(_ptr)	NULL
>  #define of_match_node(_matches, _node)	NULL
>  #define of_property_for_each_u32(np, propname, prop, p, u) \
> -- 
> 1.7.10.4
> 
> _______________________________________________
> devicetree-discuss mailing list
> devicetree-discuss at lists.ozlabs.org
> https://lists.ozlabs.org/listinfo/devicetree-discuss

Re: [PATCH 1/3] OF: Add helper for matching against linux,stdout-path

[Grant Likely]

On Mon, 19 Nov 2012 10:52:02 +0100, Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com> wrote:
> On 10:31 Thu 15 Nov     , Sascha Hauer wrote:
> > 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.
> 
> I like it but I've an issue with it I cannot specify the option for
> 
> as example I need to set the uart at 38400n8 or 115200n8 regarless of wath the
> booloader did

Right. stdout-path can have a set of arguments appended for things like
serial speed.  ePAPR says this about stdout-path:

A string that specifies the full path to the node representing the
device to be used for boot console output. If the character ":" is
present in the value it terminates the path. The value may be an alias.

If the stdin-path property is not specified, stdout-path should be
assumed to define the input device.

So, this function needs to do three more things:
- also look for 'stdout-path' (in addition to 'linux,stdout-path')
- Parse for a ':' in the path and trim that off so it can be used for
  arguments. (Bonus: return the arguments to the caller)
- make sure that it can handle the path containing an alias (I've just
  not checked if the current code will handle this)

g.

[PATCH 1/3] OF: Add helper for matching against linux, stdout-path

[Grant Likely]

On Mon, 19 Nov 2012 10:52:02 +0100, Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com> wrote:
> On 10:31 Thu 15 Nov     , Sascha Hauer wrote:
> > 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.
> 
> I like it but I've an issue with it I cannot specify the option for
> 
> as example I need to set the uart at 38400n8 or 115200n8 regarless of wath the
> booloader did

Right. stdout-path can have a set of arguments appended for things like
serial speed.  ePAPR says this about stdout-path:

A string that specifies the full path to the node representing the
device to be used for boot console output. If the character ":" is
present in the value it terminates the path. The value may be an alias.

If the stdin-path property is not specified, stdout-path should be
assumed to define the input device.

So, this function needs to do three more things:
- also look for 'stdout-path' (in addition to 'linux,stdout-path')
- Parse for a ':' in the path and trim that off so it can be used for
  arguments. (Bonus: return the arguments to the caller)
- make sure that it can handle the path containing an alias (I've just
  not checked if the current code will handle this)

g.

Re: [PATCH 1/3] OF: Add helper for matching against linux,stdout-path

[Grant Likely]

On Thu, Nov 15, 2012 at 8:49 AM, Sascha Hauer <s.hauer@pengutronix.de> wrote:
> On Wed, Nov 14, 2012 at 08:49:54PM +0000, Grant Likely wrote:
>> On Fri, Nov 2, 2012 at 9:48 AM, Sascha Hauer <s.hauer@pengutronix.de> wrote:
>> > 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@pengutronix.de>
>> > ---
>> >  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))
>>
>> need to of_node_put() the return value of of_find_node_by_path()
>>
>> > +               return 1;
>> > +
>> > +       return 0;
>> > +}
>>
>> Hi Sascha,
>>
>> I'm fine with the helper, but there really is no need for a completely
>> separate .c file. Just put it in drivers/of/base.c.
>
> I guess the same applies to include/linux/of_stdout.h.
>
> Should I drop the CONFIG_OF_STDOUT aswell?

Yup.

g.

[PATCH 1/3] OF: Add helper for matching against linux, stdout-path

[Grant Likely]

On Thu, Nov 15, 2012 at 8:49 AM, Sascha Hauer <s.hauer@pengutronix.de> wrote:
> On Wed, Nov 14, 2012 at 08:49:54PM +0000, Grant Likely wrote:
>> On Fri, Nov 2, 2012 at 9:48 AM, Sascha Hauer <s.hauer@pengutronix.de> wrote:
>> > 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@pengutronix.de>
>> > ---
>> >  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))
>>
>> need to of_node_put() the return value of of_find_node_by_path()
>>
>> > +               return 1;
>> > +
>> > +       return 0;
>> > +}
>>
>> Hi Sascha,
>>
>> I'm fine with the helper, but there really is no need for a completely
>> separate .c file. Just put it in drivers/of/base.c.
>
> I guess the same applies to include/linux/of_stdout.h.
>
> Should I drop the CONFIG_OF_STDOUT aswell?

Yup.

g.

Re: [PATCH 1/3] OF: Add helper for matching against linux,stdout-path

[Sascha Hauer]

On Wed, Nov 14, 2012 at 08:49:54PM +0000, Grant Likely wrote:
> On Fri, Nov 2, 2012 at 9:48 AM, Sascha Hauer <s.hauer@pengutronix.de> wrote:
> > 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@pengutronix.de>
> > ---
> >  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))
> 
> need to of_node_put() the return value of of_find_node_by_path()
> 
> > +               return 1;
> > +
> > +       return 0;
> > +}
> 
> Hi Sascha,
> 
> I'm fine with the helper, but there really is no need for a completely
> separate .c file. Just put it in drivers/of/base.c.

I guess the same applies to include/linux/of_stdout.h.

Should I drop the CONFIG_OF_STDOUT aswell?

Sascha


-- 
Pengutronix e.K.                           |                             |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |

[PATCH 1/3] OF: Add helper for matching against linux, stdout-path

[Sascha Hauer]

On Wed, Nov 14, 2012 at 08:49:54PM +0000, Grant Likely wrote:
> On Fri, Nov 2, 2012 at 9:48 AM, Sascha Hauer <s.hauer@pengutronix.de> wrote:
> > 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@pengutronix.de>
> > ---
> >  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))
> 
> need to of_node_put() the return value of of_find_node_by_path()
> 
> > +               return 1;
> > +
> > +       return 0;
> > +}
> 
> Hi Sascha,
> 
> I'm fine with the helper, but there really is no need for a completely
> separate .c file. Just put it in drivers/of/base.c.

I guess the same applies to include/linux/of_stdout.h.

Should I drop the CONFIG_OF_STDOUT aswell?

Sascha


-- 
Pengutronix e.K.                           |                             |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |

Re: [PATCH 1/3] OF: Add helper for matching against linux,stdout-path

[Sascha Hauer]

On Wed, Nov 14, 2012 at 08:49:54PM +0000, Grant Likely wrote:
> > +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))
> 
> need to of_node_put() the return value of of_find_node_by_path()
> 
> > +               return 1;
> > +
> > +       return 0;
> > +}
> 
> Hi Sascha,
> 
> I'm fine with the helper, but there really is no need for a completely
> separate .c file. Just put it in drivers/of/base.c.

Agreed.

Thanks,
 Sascha

-- 
Pengutronix e.K.                           |                             |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |

[PATCH 1/3] OF: Add helper for matching against linux, stdout-path

[Sascha Hauer]

On Wed, Nov 14, 2012 at 08:49:54PM +0000, Grant Likely wrote:
> > +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))
> 
> need to of_node_put() the return value of of_find_node_by_path()
> 
> > +               return 1;
> > +
> > +       return 0;
> > +}
> 
> Hi Sascha,
> 
> I'm fine with the helper, but there really is no need for a completely
> separate .c file. Just put it in drivers/of/base.c.

Agreed.

Thanks,
 Sascha

-- 
Pengutronix e.K.                           |                             |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |

Re: [PATCH 1/3] OF: Add helper for matching against linux,stdout-path

[Grant Likely]

On Fri, Nov 2, 2012 at 9:48 AM, Sascha Hauer <s.hauer@pengutronix.de> wrote:
> 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@pengutronix.de>
> ---
>  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))

need to of_node_put() the return value of of_find_node_by_path()

> +               return 1;
> +
> +       return 0;
> +}

Hi Sascha,

I'm fine with the helper, but there really is no need for a completely
separate .c file. Just put it in drivers/of/base.c.

g.

[PATCH 1/3] OF: Add helper for matching against linux, stdout-path

[Grant Likely]

On Fri, Nov 2, 2012 at 9:48 AM, Sascha Hauer <s.hauer@pengutronix.de> wrote:
> 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@pengutronix.de>
> ---
>  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))

need to of_node_put() the return value of of_find_node_by_path()

> +               return 1;
> +
> +       return 0;
> +}

Hi Sascha,

I'm fine with the helper, but there really is no need for a completely
separate .c file. Just put it in drivers/of/base.c.

g.

Re: [PATCH 1/3] OF: Add helper for matching against linux,stdout-path

[Greg Kroah-Hartman]

On Fri, Nov 02, 2012 at 10:48:52AM +0100, Sascha Hauer wrote:
> 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@pengutronix.de>
> ---
>  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

I need an ACK from the OF maintainers before I can take this through the
tty tree.

thanks,

greg k-h

[PATCH 1/3] OF: Add helper for matching against linux, stdout-path

[Greg Kroah-Hartman]

On Fri, Nov 02, 2012 at 10:48:52AM +0100, Sascha Hauer wrote:
> 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@pengutronix.de>
> ---
>  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

I need an ACK from the OF maintainers before I can take this through the
tty tree.

thanks,

greg k-h

[PATCH 1/3] OF: Add helper for matching against linux,stdout-path

[Sascha Hauer]

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@pengutronix.de>
---
 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

[PATCH 1/3] OF: Add helper for matching against linux,stdout-path

[Sascha Hauer]

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@pengutronix.de>
---
 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