Add documentation for lp120up1 panel
Signed-off-by: Jitao Shi jitao.shi@mediatek.com Acked-by: Rob Herring robh@kernel.org --- Changes since v1: - add Acked-by: Rob Herring robh@kernel.org --- .../bindings/display/panel/lg,lp120up1.txt | 7 +++++++ 1 file changed, 7 insertions(+) create mode 100644 Documentation/devicetree/bindings/display/panel/lg,lp120up1.txt
diff --git a/Documentation/devicetree/bindings/display/panel/lg,lp120up1.txt b/Documentation/devicetree/bindings/display/panel/lg,lp120up1.txt new file mode 100644 index 0000000..8c5de69 --- /dev/null +++ b/Documentation/devicetree/bindings/display/panel/lg,lp120up1.txt @@ -0,0 +1,7 @@ +LG 12.0" (1920x1280 pixels) TFT LCD panel + +Required properties: +- compatible: should be "lg,lp120up1" + +This binding is compatible with the simple-panel binding, which is specified +in simple-panel.txt in this directory.
The LG lp120up1 TFT LCD panel with eDP interface is a 12.0" 1920x1280 panel, which can be supported by the simple panel driver
Signed-off-by: Jitao Shi jitao.shi@mediatek.com --- Changes since v1: - Add eDP panel type in comment msg - Fixed comment msg with 72 characters width --- drivers/gpu/drm/panel/panel-simple.c | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+)
diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c index f88a631..2030c37 100644 --- a/drivers/gpu/drm/panel/panel-simple.c +++ b/drivers/gpu/drm/panel/panel-simple.c @@ -982,6 +982,29 @@ static const struct panel_desc lg_lb070wv8 = { .bus_format = MEDIA_BUS_FMT_RGB888_1X7X4_SPWG, };
+static const struct drm_display_mode lg_lp120up1_mode = { + .clock = 162300, + .hdisplay = 1920, + .hsync_start = 1920 + 40, + .hsync_end = 1920 + 40 + 40, + .htotal = 1920 + 40 + 40+ 80, + .vdisplay = 1280, + .vsync_start = 1280 + 4, + .vsync_end = 1280 + 4 + 4, + .vtotal = 1280 + 4 + 4 + 12, + .vrefresh = 60, +}; + +static const struct panel_desc lg_lp120up1 = { + .modes = &lg_lp120up1_mode, + .num_modes = 1, + .bpc = 8, + .size = { + .width = 267, + .height = 183, + }, +}; + static const struct drm_display_mode lg_lp129qe_mode = { .clock = 285250, .hdisplay = 2560, @@ -1256,6 +1279,9 @@ static const struct of_device_id platform_of_match[] = { .compatible = "lg,lb070wv8", .data = &lg_lb070wv8, }, { + .compatible = "lg,lp120up1", + .data = &lg_lp120up1, + }, { .compatible = "lg,lp129qe", .data = &lg_lp129qe, }, {
Hello Jitao,
Can't we add this panel information in device tree file instead inside the device driver ?
Regards Sanjeev Sharma
On Mon, Feb 22, 2016 at 4:31 PM, Jitao Shi jitao.shi@mediatek.com wrote:
The LG lp120up1 TFT LCD panel with eDP interface is a 12.0" 1920x1280 panel, which can be supported by the simple panel driver
Signed-off-by: Jitao Shi jitao.shi@mediatek.com
Changes since v1:
- Add eDP panel type in comment msg
- Fixed comment msg with 72 characters width
drivers/gpu/drm/panel/panel-simple.c | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+)
diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c index f88a631..2030c37 100644 --- a/drivers/gpu/drm/panel/panel-simple.c +++ b/drivers/gpu/drm/panel/panel-simple.c @@ -982,6 +982,29 @@ static const struct panel_desc lg_lb070wv8 = { .bus_format = MEDIA_BUS_FMT_RGB888_1X7X4_SPWG, };
+static const struct drm_display_mode lg_lp120up1_mode = {
.clock = 162300,.hdisplay = 1920,.hsync_start = 1920 + 40,.hsync_end = 1920 + 40 + 40,.htotal = 1920 + 40 + 40+ 80,.vdisplay = 1280,.vsync_start = 1280 + 4,.vsync_end = 1280 + 4 + 4,.vtotal = 1280 + 4 + 4 + 12,.vrefresh = 60,+};
+static const struct panel_desc lg_lp120up1 = {
.modes = &lg_lp120up1_mode,.num_modes = 1,.bpc = 8,.size = {.width = 267,.height = 183,},+};
static const struct drm_display_mode lg_lp129qe_mode = { .clock = 285250, .hdisplay = 2560, @@ -1256,6 +1279,9 @@ static const struct of_device_id platform_of_match[] = { .compatible = "lg,lb070wv8", .data = &lg_lb070wv8, }, {
.compatible = "lg,lp120up1",.data = &lg_lp120up1,}, { .compatible = "lg,lp129qe", .data = &lg_lp129qe, }, {-- 1.7.9.5
linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
On Mon, Feb 22, 2016 at 04:42:54PM +0530, sanjeev sharma wrote:
Hello Jitao,
Can't we add this panel information in device tree file instead inside the device driver ?
We could, but that would be redundant. Panels need to be represented by a specific compatible string anyway, and that compatible string implies the video timings, bits-per-color, width and height.
Also there's more to panels than just the timings or dimensions. Power up and power down sequences are also implied by the compatible stirng. Describing all of that in the device tree was at some point attempted, but in the end it turned out too complicated and we ended up with what we have now.
Thierry
On Mon, Feb 22, 2016 at 4:31 PM, Jitao Shi jitao.shi@mediatek.com wrote:
The LG lp120up1 TFT LCD panel with eDP interface is a 12.0" 1920x1280 panel, which can be supported by the simple panel driver
Signed-off-by: Jitao Shi jitao.shi@mediatek.com
Changes since v1:
- Add eDP panel type in comment msg
- Fixed comment msg with 72 characters width
drivers/gpu/drm/panel/panel-simple.c | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+)
diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c index f88a631..2030c37 100644 --- a/drivers/gpu/drm/panel/panel-simple.c +++ b/drivers/gpu/drm/panel/panel-simple.c @@ -982,6 +982,29 @@ static const struct panel_desc lg_lb070wv8 = { .bus_format = MEDIA_BUS_FMT_RGB888_1X7X4_SPWG, };
+static const struct drm_display_mode lg_lp120up1_mode = {
.clock = 162300,.hdisplay = 1920,.hsync_start = 1920 + 40,.hsync_end = 1920 + 40 + 40,.htotal = 1920 + 40 + 40+ 80,.vdisplay = 1280,.vsync_start = 1280 + 4,.vsync_end = 1280 + 4 + 4,.vtotal = 1280 + 4 + 4 + 12,.vrefresh = 60,+};
+static const struct panel_desc lg_lp120up1 = {
.modes = &lg_lp120up1_mode,.num_modes = 1,.bpc = 8,.size = {.width = 267,.height = 183,},+};
static const struct drm_display_mode lg_lp129qe_mode = { .clock = 285250, .hdisplay = 2560, @@ -1256,6 +1279,9 @@ static const struct of_device_id platform_of_match[] = { .compatible = "lg,lb070wv8", .data = &lg_lb070wv8, }, {
.compatible = "lg,lp120up1",.data = &lg_lp120up1,}, { .compatible = "lg,lp129qe", .data = &lg_lp129qe, }, {-- 1.7.9.5
linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
Hello Thierry,
I am not agree here and how it would be redundant ?
please see lvds interface, where panel timing parameter is defined in the Device Tree. If there are multiple display panel then we can create a separate dtsi file and include in main Board dts file. I believe that, It is simpler way to support multiple panel.
http://git.freescale.com/git/cgit.cgi/imx/linux-2.6-imx.git/tree/arch/arm/bo...
Regards Sanjeev Sharma
On Mon, Feb 22, 2016 at 5:13 PM, Thierry Reding thierry.reding@gmail.com wrote:
On Mon, Feb 22, 2016 at 04:42:54PM +0530, sanjeev sharma wrote:
Hello Jitao,
Can't we add this panel information in device tree file instead inside
the
device driver ?
We could, but that would be redundant. Panels need to be represented by a specific compatible string anyway, and that compatible string implies the video timings, bits-per-color, width and height.
Also there's more to panels than just the timings or dimensions. Power up and power down sequences are also implied by the compatible stirng. Describing all of that in the device tree was at some point attempted, but in the end it turned out too complicated and we ended up with what we have now.
Thierry
On Mon, Feb 22, 2016 at 4:31 PM, Jitao Shi jitao.shi@mediatek.com
wrote:
The LG lp120up1 TFT LCD panel with eDP interface is a 12.0" 1920x1280 panel, which can be supported by the simple panel driver
Signed-off-by: Jitao Shi jitao.shi@mediatek.com
Changes since v1:
- Add eDP panel type in comment msg
- Fixed comment msg with 72 characters width
drivers/gpu/drm/panel/panel-simple.c | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+)
diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c index f88a631..2030c37 100644 --- a/drivers/gpu/drm/panel/panel-simple.c +++ b/drivers/gpu/drm/panel/panel-simple.c @@ -982,6 +982,29 @@ static const struct panel_desc lg_lb070wv8 = { .bus_format = MEDIA_BUS_FMT_RGB888_1X7X4_SPWG, };
+static const struct drm_display_mode lg_lp120up1_mode = {
.clock = 162300,.hdisplay = 1920,.hsync_start = 1920 + 40,.hsync_end = 1920 + 40 + 40,.htotal = 1920 + 40 + 40+ 80,.vdisplay = 1280,.vsync_start = 1280 + 4,.vsync_end = 1280 + 4 + 4,.vtotal = 1280 + 4 + 4 + 12,.vrefresh = 60,+};
+static const struct panel_desc lg_lp120up1 = {
.modes = &lg_lp120up1_mode,.num_modes = 1,.bpc = 8,.size = {.width = 267,.height = 183,},+};
static const struct drm_display_mode lg_lp129qe_mode = { .clock = 285250, .hdisplay = 2560, @@ -1256,6 +1279,9 @@ static const struct of_device_id
platform_of_match[]
= { .compatible = "lg,lb070wv8", .data = &lg_lb070wv8, }, {
.compatible = "lg,lp120up1",.data = &lg_lp120up1,}, { .compatible = "lg,lp129qe", .data = &lg_lp129qe, }, {-- 1.7.9.5
linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
On Tue, Feb 23, 2016 at 10:45:01AM +0530, sanjeev sharma wrote:
Hello Thierry,
I am not agree here and how it would be redundant ?
The panel being a separate device means that it needs a compatible value and the compatible value implies a specific video timing. It would be redundant, therefore, to repeat the video timing in the panel's device tree node that already has the compatible string.
please see lvds interface, where panel timing parameter is defined in the Device Tree. If there are multiple display panel then we can create a separate dtsi file and include in main Board dts file. I believe that, It is simpler way to support multiple panel.
Two things: you can define a separate .dtsi file with the panel definition with the current approach, too. But it would be a waste to do so because really the only thing you need to change is the compatible string.
The approach chosen in the DTS that you link to below might seem like a simpler way, but it completely ignores aspects other than timings. What if the panel requires a GPIO and or regulator to turn on. How are you going to represent the power up sequence for that in DT? This was attempted a long time ago and deemed too complicated to do in DT, hence why we ended up with what we have now.
There are also panels on more complicated busses, such as DSI. These panels often require additional register programming, so in addition to the above you'd need some sort of register programming table in DT for these to work.
http://git.freescale.com/git/cgit.cgi/imx/linux-2.6-imx.git/tree/arch/arm/bo...
That's not an upstream tree, so it isn't relevant to this discussion. The decision to make the panel a separate device and put the video timings into the driver was made a couple of years ago and we're not going to change that. It's fine if you want to disagree, but I'm afraid it won't change things.
Thierry
On Mon, Feb 22, 2016 at 5:13 PM, Thierry Reding thierry.reding@gmail.com wrote:
On Mon, Feb 22, 2016 at 04:42:54PM +0530, sanjeev sharma wrote:
Hello Jitao,
Can't we add this panel information in device tree file instead inside
the
device driver ?
We could, but that would be redundant. Panels need to be represented by a specific compatible string anyway, and that compatible string implies the video timings, bits-per-color, width and height.
Also there's more to panels than just the timings or dimensions. Power up and power down sequences are also implied by the compatible stirng. Describing all of that in the device tree was at some point attempted, but in the end it turned out too complicated and we ended up with what we have now.
Thierry
On Mon, Feb 22, 2016 at 4:31 PM, Jitao Shi jitao.shi@mediatek.com
wrote:
The LG lp120up1 TFT LCD panel with eDP interface is a 12.0" 1920x1280 panel, which can be supported by the simple panel driver
Signed-off-by: Jitao Shi jitao.shi@mediatek.com
Changes since v1:
- Add eDP panel type in comment msg
- Fixed comment msg with 72 characters width
drivers/gpu/drm/panel/panel-simple.c | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+)
diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c index f88a631..2030c37 100644 --- a/drivers/gpu/drm/panel/panel-simple.c +++ b/drivers/gpu/drm/panel/panel-simple.c @@ -982,6 +982,29 @@ static const struct panel_desc lg_lb070wv8 = { .bus_format = MEDIA_BUS_FMT_RGB888_1X7X4_SPWG, };
+static const struct drm_display_mode lg_lp120up1_mode = {
.clock = 162300,.hdisplay = 1920,.hsync_start = 1920 + 40,.hsync_end = 1920 + 40 + 40,.htotal = 1920 + 40 + 40+ 80,.vdisplay = 1280,.vsync_start = 1280 + 4,.vsync_end = 1280 + 4 + 4,.vtotal = 1280 + 4 + 4 + 12,.vrefresh = 60,+};
+static const struct panel_desc lg_lp120up1 = {
.modes = &lg_lp120up1_mode,.num_modes = 1,.bpc = 8,.size = {.width = 267,.height = 183,},+};
static const struct drm_display_mode lg_lp129qe_mode = { .clock = 285250, .hdisplay = 2560, @@ -1256,6 +1279,9 @@ static const struct of_device_id
platform_of_match[]
= { .compatible = "lg,lb070wv8", .data = &lg_lb070wv8, }, {
.compatible = "lg,lp120up1",.data = &lg_lp120up1,}, { .compatible = "lg,lp129qe", .data = &lg_lp129qe, }, {-- 1.7.9.5
linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
On Mon, Feb 22, 2016 at 07:01:44PM +0800, Jitao Shi wrote:
The LG lp120up1 TFT LCD panel with eDP interface is a 12.0" 1920x1280 panel, which can be supported by the simple panel driver
Signed-off-by: Jitao Shi jitao.shi@mediatek.com
Changes since v1:
- Add eDP panel type in comment msg
- Fixed comment msg with 72 characters width
drivers/gpu/drm/panel/panel-simple.c | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+)
Applied, thanks.
Thierry
On Mon, Feb 22, 2016 at 07:01:43PM +0800, Jitao Shi wrote:
Add documentation for lp120up1 panel
Signed-off-by: Jitao Shi jitao.shi@mediatek.com Acked-by: Rob Herring robh@kernel.org
Changes since v1:
- add Acked-by: Rob Herring robh@kernel.org
.../bindings/display/panel/lg,lp120up1.txt | 7 +++++++ 1 file changed, 7 insertions(+) create mode 100644 Documentation/devicetree/bindings/display/panel/lg,lp120up1.txt
Applied, thanks.
Thierry
dri-devel@lists.freedesktop.org
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Jitao Shi -
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Thierry Reding