Re: [PATCH v12 4/6] fbmon: add of_videomode helpers

Started by Tomi Valkeinen on Nov 21, 2012 · 4 messages from 4 authors · Last reply Nov 21, 2012

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On 2012-11-20 17:54, Steffen Trumtrar wrote:

Add helper to get fb_videomode from devicetree.

Signed-off-by: Steffen Trumtrar <redacted>
Reviewed-by: Thierry Reding <redacted>
Acked-by: Thierry Reding <redacted>
Tested-by: Thierry Reding <redacted>
Tested-by: Philipp Zabel <p.zabel@pengutronix.de>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
---
 drivers/video/fbmon.c |   42 +++++++++++++++++++++++++++++++++++++++++-
 include/linux/fb.h    |    7 +++++++
 2 files changed, 48 insertions(+), 1 deletion(-)

quoted hunk

diff --git a/include/linux/fb.h b/include/linux/fb.h
index 920cbe3..41b5e49 100644
--- a/include/linux/fb.h
+++ b/include/linux/fb.h

@@ -15,6 +15,8 @@
 #include <linux/slab.h>
 #include <asm/io.h>
 #include <linux/videomode.h>
+#include <linux/of.h>
+#include <linux/of_videomode.h>

Guess what? =)

To be honest, I don't know what the general opinion is about including
header files from header files. But I always leave them out if they are
not strictly needed.

quoted hunk

 struct vm_area_struct;
 struct fb_info;

@@ -715,6 +717,11 @@ extern void fb_destroy_modedb(struct fb_videomode *modedb);
 extern int fb_find_mode_cvt(struct fb_videomode *mode, int margins, int rb);
 extern unsigned char *fb_ddc_read(struct i2c_adapter *adapter);
 
+#if IS_ENABLED(CONFIG_OF_VIDEOMODE)
+extern int of_get_fb_videomode(const struct device_node *np,
+			       struct fb_videomode *fb,
+			       unsigned int index);
+#endif
 #if IS_ENABLED(CONFIG_VIDEOMODE)
 extern int fb_videomode_from_videomode(const struct videomode *vm,
 				       struct fb_videomode *fbmode);

Do you really need these #ifs in the header files? They do make it look
a bit messy. If somebody uses the functions and CONFIG_VIDEOMODE is not
enabled, he'll get a linker error anyway.

 Tomi

Laurent Pinchart replied to Tomi Valkeinen Nov 21, 13:08 #

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Hi Tomi,

On Wednesday 21 November 2012 14:49:30 Tomi Valkeinen wrote:

On 2012-11-20 17:54, Steffen Trumtrar wrote:

quoted

Add helper to get fb_videomode from devicetree.

Signed-off-by: Steffen Trumtrar <redacted>
Reviewed-by: Thierry Reding <redacted>
Acked-by: Thierry Reding <redacted>
Tested-by: Thierry Reding <redacted>
Tested-by: Philipp Zabel <p.zabel@pengutronix.de>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
---

 drivers/video/fbmon.c |   42 +++++++++++++++++++++++++++++++++++++++++-
 include/linux/fb.h    |    7 +++++++
 2 files changed, 48 insertions(+), 1 deletion(-)

diff --git a/include/linux/fb.h b/include/linux/fb.h
index 920cbe3..41b5e49 100644
--- a/include/linux/fb.h
+++ b/include/linux/fb.h

@@ -15,6 +15,8 @@

 #include <linux/slab.h>
 #include <asm/io.h>
 #include <linux/videomode.h>

+#include <linux/of.h>
+#include <linux/of_videomode.h>

Guess what? =)

To be honest, I don't know what the general opinion is about including
header files from header files. But I always leave them out if they are
not strictly needed.

I agree, I favor structure declaration as well when possible.

quoted

 struct vm_area_struct;
 struct fb_info;

@@ -715,6 +717,11 @@ extern void fb_destroy_modedb(struct fb_videomode

*modedb);> 
 extern int fb_find_mode_cvt(struct fb_videomode *mode, int margins, int
 rb); extern unsigned char *fb_ddc_read(struct i2c_adapter *adapter);

+#if IS_ENABLED(CONFIG_OF_VIDEOMODE)
+extern int of_get_fb_videomode(const struct device_node *np,
+			       struct fb_videomode *fb,
+			       unsigned int index);
+#endif

 #if IS_ENABLED(CONFIG_VIDEOMODE)
 extern int fb_videomode_from_videomode(const struct videomode *vm,
 
 				       struct fb_videomode *fbmode);

Do you really need these #ifs in the header files? They do make it look
a bit messy. If somebody uses the functions and CONFIG_VIDEOMODE is not
enabled, he'll get a linker error anyway.

-- 
Regards,

Laurent Pinchart

Steffen Trumtrar replied to Tomi Valkeinen Nov 21, 16:24 #

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On Wed, Nov 21, 2012 at 02:49:30PM +0200, Tomi Valkeinen wrote:

On 2012-11-20 17:54, Steffen Trumtrar wrote:

quoted

Add helper to get fb_videomode from devicetree.

Signed-off-by: Steffen Trumtrar <redacted>
Reviewed-by: Thierry Reding <redacted>
Acked-by: Thierry Reding <redacted>
Tested-by: Thierry Reding <redacted>
Tested-by: Philipp Zabel <p.zabel@pengutronix.de>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
---
 drivers/video/fbmon.c |   42 +++++++++++++++++++++++++++++++++++++++++-
 include/linux/fb.h    |    7 +++++++
 2 files changed, 48 insertions(+), 1 deletion(-)

quoted

diff --git a/include/linux/fb.h b/include/linux/fb.h
index 920cbe3..41b5e49 100644
--- a/include/linux/fb.h
+++ b/include/linux/fb.h

@@ -15,6 +15,8 @@
 #include <linux/slab.h>
 #include <asm/io.h>
 #include <linux/videomode.h>
+#include <linux/of.h>
+#include <linux/of_videomode.h>

Guess what? =)

To be honest, I don't know what the general opinion is about including
header files from header files. But I always leave them out if they are
not strictly needed.

Okay. Seems to fit with the rest of the file;

quoted

 struct vm_area_struct;
 struct fb_info;

@@ -715,6 +717,11 @@ extern void fb_destroy_modedb(struct fb_videomode *modedb);
 extern int fb_find_mode_cvt(struct fb_videomode *mode, int margins, int rb);
 extern unsigned char *fb_ddc_read(struct i2c_adapter *adapter);
 
+#if IS_ENABLED(CONFIG_OF_VIDEOMODE)
+extern int of_get_fb_videomode(const struct device_node *np,
+			       struct fb_videomode *fb,
+			       unsigned int index);
+#endif
 #if IS_ENABLED(CONFIG_VIDEOMODE)
 extern int fb_videomode_from_videomode(const struct videomode *vm,
 				       struct fb_videomode *fbmode);

Do you really need these #ifs in the header files? They do make it look
a bit messy. If somebody uses the functions and CONFIG_VIDEOMODE is not
enabled, he'll get a linker error anyway.

Well, I don't remember at the moment who requested this, but it was not my
idea to put them there. So, this is a matter of style I guess.
But maybe I understood that wrong.


Regards,
Steffen



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Tomi Valkeinen replied to Steffen Trumtrar Nov 21, 16:47 #

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On 2012-11-21 18:24, Steffen Trumtrar wrote:

On Wed, Nov 21, 2012 at 02:49:30PM +0200, Tomi Valkeinen wrote:

quoted

@@ -715,6 +717,11 @@ extern void fb_destroy_modedb(struct fb_videomode *modedb);
 extern int fb_find_mode_cvt(struct fb_videomode *mode, int margins, int rb);
 extern unsigned char *fb_ddc_read(struct i2c_adapter *adapter);
 
+#if IS_ENABLED(CONFIG_OF_VIDEOMODE)
+extern int of_get_fb_videomode(const struct device_node *np,
+			       struct fb_videomode *fb,
+			       unsigned int index);
+#endif
 #if IS_ENABLED(CONFIG_VIDEOMODE)
 extern int fb_videomode_from_videomode(const struct videomode *vm,
 				       struct fb_videomode *fbmode);

Do you really need these #ifs in the header files? They do make it look
a bit messy. If somebody uses the functions and CONFIG_VIDEOMODE is not
enabled, he'll get a linker error anyway.

Well, I don't remember at the moment who requested this, but it was not my
idea to put them there. So, this is a matter of style I guess.
But maybe I understood that wrong.

Right, one reviewer says this way, and another says that way =).

With the header files I've made I only use #ifs with #else, when I want
to give a static inline empty/no-op implementation for the function in
case the feature is not compiled into the kernel.

As you said, matter of taste. Up to you.

 Tomi

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