[PATCH v3 1/3] dt-bindings: Add doc for the ingenic-drm driver

[PATCH v3 1/3] dt-bindings: Add doc for the ingenic-drm driver

[Paul Cercueil]

Add documentation for the devicetree bindings of the DRM driver for the
JZ47xx family of SoCs from Ingenic.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Tested-by: Artur Rojek <contact@artur-rojek.eu>
---

Notes:
    v2: Remove ingenic,panel property.
    
    v3: - Rename compatible strings from ingenic,jz47XX-drm to ingenic,jz47XX-lcd
        - The ingenic,lcd-mode property is now read from the panel node instead
    	  of from the driver node

 .../devicetree/bindings/display/ingenic,drm.txt    | 53 ++++++++++++++++++++++
 1 file changed, 53 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/display/ingenic,drm.txt

diff --git a/Documentation/devicetree/bindings/display/ingenic,drm.txt b/Documentation/devicetree/bindings/display/ingenic,drm.txt
new file mode 100644
index 000000000000..9de47db8a515
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/ingenic,drm.txt
@@ -0,0 +1,53 @@
+Ingenic JZ47xx DRM driver
+
+Required properties:
+- compatible: one of:
+  * ingenic,jz4740-lcd
+  * ingenic,jz4725b-lcd
+- reg: LCD registers location and length
+- clocks: LCD pixclock and device clock specifiers.
+	   The device clock is only required on the JZ4740.
+- clock-names: "lcd_pclk" and "lcd"
+- interrupts: Specifies the interrupt line the LCD controller is connected to.
+
+Optional properties in the panel mode:
+- ingenic,lcd-mode: LCD mode to use with the display panel.
+		    See <dt-bindings/display/ingenic,drm.h> for all the
+		    possible values.
+
+Example:
+
+#include <dt-bindings/display/ingenic,drm.h>
+
+panel {
+	compatible = "sharp,ls020b1dd01d", "simple-panel";
+
+	backlight = <&backlight>;
+	power-supply = <&vcc>;
+
+	ingenic,lcd-mode = <JZ_LCD_SPECIAL_TFT_2>;
+
+	port {
+		panel_input: endpoint {
+			remote-endpoint = <&panel_output>;
+		};
+	};
+};
+
+
+lcd: lcd-controller@13050000 {
+	compatible = "ingenic,jz4725b-lcd";
+	reg = <0x13050000 0x1000>;
+
+	interrupt-parent = <&intc>;
+	interrupts = <31>;
+
+	clocks = <&cgu JZ4725B_CLK_LCD>;
+	clock-names = "lcd";
+
+	port {
+		panel_output: endpoint {
+			remote-endpoint = <&panel_input>;
+		};
+	};
+};
-- 
2.11.0

[PATCH v3 2/3] dt-bindings: Add header for the ingenic-drm driver bindings

[Paul Cercueil]

Add macros that can be used with the ingenic,lcd-mode property in the
devicetree node that corresponds to the ingenic-drm driver.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Tested-by: Artur Rojek <contact@artur-rojek.eu>
---

Notes:
    v2: No change
    
    v3: s/_DRM//

 include/dt-bindings/display/ingenic,drm.h | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)
 create mode 100644 include/dt-bindings/display/ingenic,drm.h

diff --git a/include/dt-bindings/display/ingenic,drm.h b/include/dt-bindings/display/ingenic,drm.h
new file mode 100644
index 000000000000..c749b8c346fc
--- /dev/null
+++ b/include/dt-bindings/display/ingenic,drm.h
@@ -0,0 +1,28 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ *  Ingenic JZ47xx KMS driver
+ *
+ *  Copyright (C) 2019, Paul Cercueil <paul@crapouillou.net>
+ */
+#ifndef __INCLUDE_DT_BINDINGS_DISPLAY_INGENIC_DRM_H__
+#define __INCLUDE_DT_BINDINGS_DISPLAY_INGENIC_DRM_H__
+
+#define JZ_LCD_GENERIC_16BIT			0
+#define JZ_LCD_GENERIC_18BIT			16
+
+#define JZ_LCD_SPECIAL_TFT_1			1
+#define JZ_LCD_SPECIAL_TFT_2			2
+#define JZ_LCD_SPECIAL_TFT_3			3
+
+#define JZ_LCD_NON_INTERLACED_TV_OUT		4
+#define JZ_LCD_INTERLACED_TV_OUT		6
+
+#define JZ_LCD_SINGLE_COLOR_STN			8
+#define JZ_LCD_SINGLE_MONOCHROME_STN		9
+#define JZ_LCD_DUAL_COLOR_STN			10
+#define JZ_LCD_DUAL_MONOCHROME_STN		11
+
+#define JZ_LCD_8BIT_SERIAL			12
+#define JZ_LCD_LCM				13
+
+#endif /* __INCLUDE_DT_BINDINGS_DISPLAY_INGENIC_DRM_H__ */
-- 
2.11.0

Re: [PATCH v3 2/3] dt-bindings: Add header for the ingenic-drm driver bindings

[Rob Herring]

On Sun, Apr 14, 2019 at 3:08 PM Paul Cercueil <paul@crapouillou.net> wrote:
>
> Add macros that can be used with the ingenic,lcd-mode property in the
> devicetree node that corresponds to the ingenic-drm driver.

DRM is a Linuxism.

>
> Signed-off-by: Paul Cercueil <paul@crapouillou.net>
> Tested-by: Artur Rojek <contact@artur-rojek.eu>
> ---
>
> Notes:
>     v2: No change
>
>     v3: s/_DRM//
>
>  include/dt-bindings/display/ingenic,drm.h | 28 ++++++++++++++++++++++++++++

DRM is a Linuxism...

>  1 file changed, 28 insertions(+)
>  create mode 100644 include/dt-bindings/display/ingenic,drm.h
>
> diff --git a/include/dt-bindings/display/ingenic,drm.h b/include/dt-bindings/display/ingenic,drm.h
> new file mode 100644
> index 000000000000..c749b8c346fc
> --- /dev/null
> +++ b/include/dt-bindings/display/ingenic,drm.h
> @@ -0,0 +1,28 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + *  Ingenic JZ47xx KMS driver

Pretty sure this file is not a KMS driver.

> + *
> + *  Copyright (C) 2019, Paul Cercueil <paul@crapouillou.net>
> + */
> +#ifndef __INCLUDE_DT_BINDINGS_DISPLAY_INGENIC_DRM_H__
> +#define __INCLUDE_DT_BINDINGS_DISPLAY_INGENIC_DRM_H__
> +
> +#define JZ_LCD_GENERIC_16BIT                   0
> +#define JZ_LCD_GENERIC_18BIT                   16

We have some generic properties for defining the bus width already.
Plus, in many cases this can be implied by the panel compatible. The
exceptions are cases such as when both the ctrlr and panel support
multiple modes.

> +
> +#define JZ_LCD_SPECIAL_TFT_1                   1
> +#define JZ_LCD_SPECIAL_TFT_2                   2
> +#define JZ_LCD_SPECIAL_TFT_3                   3
> +
> +#define JZ_LCD_NON_INTERLACED_TV_OUT           4
> +#define JZ_LCD_INTERLACED_TV_OUT               6

Wouldn't this be determined by the type of connector (composite vs.
s-video/component)

> +
> +#define JZ_LCD_SINGLE_COLOR_STN                        8
> +#define JZ_LCD_SINGLE_MONOCHROME_STN           9
> +#define JZ_LCD_DUAL_COLOR_STN                  10
> +#define JZ_LCD_DUAL_MONOCHROME_STN             11
> +
> +#define JZ_LCD_8BIT_SERIAL                     12
> +#define JZ_LCD_LCM                             13
> +
> +#endif /* __INCLUDE_DT_BINDINGS_DISPLAY_INGENIC_DRM_H__ */
> --
> 2.11.0
>

Re: [PATCH v3 2/3] dt-bindings: Add header for the ingenic-drm driver bindings

[Rob Herring]

Paul, This mail bounced for me, but the other one on patch 1 didn't.

On Wed, Apr 17, 2019 at 8:47 AM Rob Herring <robh+dt@kernel.org> wrote:
>
> On Sun, Apr 14, 2019 at 3:08 PM Paul Cercueil <paul@crapouillou.net> wrote:
> >
> > Add macros that can be used with the ingenic,lcd-mode property in the
> > devicetree node that corresponds to the ingenic-drm driver.
>
> DRM is a Linuxism.
>
> >
> > Signed-off-by: Paul Cercueil <paul@crapouillou.net>
> > Tested-by: Artur Rojek <contact@artur-rojek.eu>
> > ---
> >
> > Notes:
> >     v2: No change
> >
> >     v3: s/_DRM//
> >
> >  include/dt-bindings/display/ingenic,drm.h | 28 ++++++++++++++++++++++++++++
>
> DRM is a Linuxism...
>
> >  1 file changed, 28 insertions(+)
> >  create mode 100644 include/dt-bindings/display/ingenic,drm.h
> >
> > diff --git a/include/dt-bindings/display/ingenic,drm.h b/include/dt-bindings/display/ingenic,drm.h
> > new file mode 100644
> > index 000000000000..c749b8c346fc
> > --- /dev/null
> > +++ b/include/dt-bindings/display/ingenic,drm.h
> > @@ -0,0 +1,28 @@
> > +/* SPDX-License-Identifier: GPL-2.0 */
> > +/*
> > + *  Ingenic JZ47xx KMS driver
>
> Pretty sure this file is not a KMS driver.
>
> > + *
> > + *  Copyright (C) 2019, Paul Cercueil <paul@crapouillou.net>
> > + */
> > +#ifndef __INCLUDE_DT_BINDINGS_DISPLAY_INGENIC_DRM_H__
> > +#define __INCLUDE_DT_BINDINGS_DISPLAY_INGENIC_DRM_H__
> > +
> > +#define JZ_LCD_GENERIC_16BIT                   0
> > +#define JZ_LCD_GENERIC_18BIT                   16
>
> We have some generic properties for defining the bus width already.
> Plus, in many cases this can be implied by the panel compatible. The
> exceptions are cases such as when both the ctrlr and panel support
> multiple modes.
>
> > +
> > +#define JZ_LCD_SPECIAL_TFT_1                   1
> > +#define JZ_LCD_SPECIAL_TFT_2                   2
> > +#define JZ_LCD_SPECIAL_TFT_3                   3
> > +
> > +#define JZ_LCD_NON_INTERLACED_TV_OUT           4
> > +#define JZ_LCD_INTERLACED_TV_OUT               6
>
> Wouldn't this be determined by the type of connector (composite vs.
> s-video/component)
>
> > +
> > +#define JZ_LCD_SINGLE_COLOR_STN                        8
> > +#define JZ_LCD_SINGLE_MONOCHROME_STN           9
> > +#define JZ_LCD_DUAL_COLOR_STN                  10
> > +#define JZ_LCD_DUAL_MONOCHROME_STN             11
> > +
> > +#define JZ_LCD_8BIT_SERIAL                     12
> > +#define JZ_LCD_LCM                             13
> > +
> > +#endif /* __INCLUDE_DT_BINDINGS_DISPLAY_INGENIC_DRM_H__ */
> > --
> > 2.11.0
> >

Re: [PATCH v3 2/3] dt-bindings: Add header for the ingenic-drm driver bindings

[Ezequiel Garcia]

On Wed, 17 Apr 2019 at 10:48, Rob Herring <robh+dt@kernel.org> wrote:
>
> On Sun, Apr 14, 2019 at 3:08 PM Paul Cercueil <paul@crapouillou.net> wrote:
> >
> > Add macros that can be used with the ingenic,lcd-mode property in the
> > devicetree node that corresponds to the ingenic-drm driver.
>
> DRM is a Linuxism.
>
> >
> > Signed-off-by: Paul Cercueil <paul@crapouillou.net>
> > Tested-by: Artur Rojek <contact@artur-rojek.eu>
> > ---
> >
> > Notes:
> >     v2: No change
> >
> >     v3: s/_DRM//
> >
> >  include/dt-bindings/display/ingenic,drm.h | 28 ++++++++++++++++++++++++++++
>
> DRM is a Linuxism...
>
> >  1 file changed, 28 insertions(+)
> >  create mode 100644 include/dt-bindings/display/ingenic,drm.h
> >
> > diff --git a/include/dt-bindings/display/ingenic,drm.h b/include/dt-bindings/display/ingenic,drm.h
> > new file mode 100644
> > index 000000000000..c749b8c346fc
> > --- /dev/null
> > +++ b/include/dt-bindings/display/ingenic,drm.h
> > @@ -0,0 +1,28 @@
> > +/* SPDX-License-Identifier: GPL-2.0 */
> > +/*
> > + *  Ingenic JZ47xx KMS driver
>
> Pretty sure this file is not a KMS driver.
>
> > + *
> > + *  Copyright (C) 2019, Paul Cercueil <paul@crapouillou.net>
> > + */
> > +#ifndef __INCLUDE_DT_BINDINGS_DISPLAY_INGENIC_DRM_H__
> > +#define __INCLUDE_DT_BINDINGS_DISPLAY_INGENIC_DRM_H__
> > +
> > +#define JZ_LCD_GENERIC_16BIT                   0
> > +#define JZ_LCD_GENERIC_18BIT                   16
>
> We have some generic properties for defining the bus width already.
> Plus, in many cases this can be implied by the panel compatible. The
> exceptions are cases such as when both the ctrlr and panel support
> multiple modes.
>

In the same direction as Rob's comment, I'd like to see these decoupled
from the register value.

Ideally, we'd like to reuse this driver and its bindings for JZ4780,
and these values are already different.

Thanks!
-- 
Ezequiel García, VanguardiaSur
www.vanguardiasur.com.ar

Re: [PATCH v3 2/3] dt-bindings: Add header for the ingenic-drm driver bindings

[Paul Cercueil]

Hi,

Le sam. 20 avril 2019 à 14:23, Ezequiel Garcia 
<ezequiel@vanguardiasur.com.ar> a écrit :
> On Wed, 17 Apr 2019 at 10:48, Rob Herring <robh+dt@kernel.org> wrote:
>> 
>>  On Sun, Apr 14, 2019 at 3:08 PM Paul Cercueil 
>> <paul@crapouillou.net> wrote:
>>  >
>>  > Add macros that can be used with the ingenic,lcd-mode property in 
>> the
>>  > devicetree node that corresponds to the ingenic-drm driver.
>> 
>>  DRM is a Linuxism.
>> 
>>  >
>>  > Signed-off-by: Paul Cercueil <paul@crapouillou.net>
>>  > Tested-by: Artur Rojek <contact@artur-rojek.eu>
>>  > ---
>>  >
>>  > Notes:
>>  >     v2: No change
>>  >
>>  >     v3: s/_DRM//
>>  >
>>  >  include/dt-bindings/display/ingenic,drm.h | 28 
>> ++++++++++++++++++++++++++++
>> 
>>  DRM is a Linuxism...
>> 
>>  >  1 file changed, 28 insertions(+)
>>  >  create mode 100644 include/dt-bindings/display/ingenic,drm.h
>>  >
>>  > diff --git a/include/dt-bindings/display/ingenic,drm.h 
>> b/include/dt-bindings/display/ingenic,drm.h
>>  > new file mode 100644
>>  > index 000000000000..c749b8c346fc
>>  > --- /dev/null
>>  > +++ b/include/dt-bindings/display/ingenic,drm.h
>>  > @@ -0,0 +1,28 @@
>>  > +/* SPDX-License-Identifier: GPL-2.0 */
>>  > +/*
>>  > + *  Ingenic JZ47xx KMS driver
>> 
>>  Pretty sure this file is not a KMS driver.
>> 
>>  > + *
>>  > + *  Copyright (C) 2019, Paul Cercueil <paul@crapouillou.net>
>>  > + */
>>  > +#ifndef __INCLUDE_DT_BINDINGS_DISPLAY_INGENIC_DRM_H__
>>  > +#define __INCLUDE_DT_BINDINGS_DISPLAY_INGENIC_DRM_H__
>>  > +
>>  > +#define JZ_LCD_GENERIC_16BIT                   0
>>  > +#define JZ_LCD_GENERIC_18BIT                   16
>> 
>>  We have some generic properties for defining the bus width already.
>>  Plus, in many cases this can be implied by the panel compatible. The
>>  exceptions are cases such as when both the ctrlr and panel support
>>  multiple modes.
>> 
> 
> In the same direction as Rob's comment, I'd like to see these 
> decoupled
> from the register value.
> 
> Ideally, we'd like to reuse this driver and its bindings for JZ4780,
> and these values are already different.

Well they are not any different on the JZ4780, I just checked on the 
manual.
But yes, I don't mind getting rid of that devicetree property and its
corresponding bindings file.

The major problem is that we don't have a way to map some of the values 
there
to DRM macros. I sumitted a PR to add a MEDIA_BUS_FMT_RGB888_3X8_BE bus 
format
(that I could detect to support 8-bit serial TFT panels, which is what 
the
Ben Nanonote uses), but I miss a way to detect the special* TFT panels.
I will leave these aside for now, but I want to support them eventually.

Thanks,
-Paul

* "special" TFT panels have extra pins (CLS, SPL, REV, PS) and seem to 
be a
thing from Sharp. Ingenic SoCs (as well as i.MX SoCs) have the required
hardware to drive these panels.

> Thanks!
> --
> Ezequiel García, VanguardiaSur
> www.vanguardiasur.com.ar

[PATCH v3 3/3] DRM: Add KMS driver for the Ingenic JZ47xx SoCs

[Paul Cercueil]

Add a KMS driver for the Ingenic JZ47xx family of SoCs.
This driver is meant to replace the aging jz4740-fb driver.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Tested-by: Artur Rojek <contact@artur-rojek.eu>
---

Notes:
    v2: - Remove custom handling of panel. The panel is now discovered using
    	  the standard API.
    	- Lots of small tweaks suggested by upstream
    
    v3: - Use devm_drm_dev_init()
        - Update compatible strings to -lcd instead of -drm
    	- Add destroy() callbacks to plane and crtc
    	- The ingenic,lcd-mode is now read from the bridge's DT node

 drivers/gpu/drm/Kconfig               |   2 +
 drivers/gpu/drm/Makefile              |   1 +
 drivers/gpu/drm/ingenic/Kconfig       |  16 +
 drivers/gpu/drm/ingenic/Makefile      |   1 +
 drivers/gpu/drm/ingenic/ingenic-drm.c | 808 ++++++++++++++++++++++++++++++++++
 5 files changed, 828 insertions(+)
 create mode 100644 drivers/gpu/drm/ingenic/Kconfig
 create mode 100644 drivers/gpu/drm/ingenic/Makefile
 create mode 100644 drivers/gpu/drm/ingenic/ingenic-drm.c

diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
index 39d5f7562f1c..6863223c61d5 100644
--- a/drivers/gpu/drm/Kconfig
+++ b/drivers/gpu/drm/Kconfig
@@ -307,6 +307,8 @@ source "drivers/gpu/drm/sti/Kconfig"
 
 source "drivers/gpu/drm/imx/Kconfig"
 
+source "drivers/gpu/drm/ingenic/Kconfig"
+
 source "drivers/gpu/drm/v3d/Kconfig"
 
 source "drivers/gpu/drm/vc4/Kconfig"
diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
index 3d0c75cd687c..1c2aca7965bd 100644
--- a/drivers/gpu/drm/Makefile
+++ b/drivers/gpu/drm/Makefile
@@ -95,6 +95,7 @@ obj-$(CONFIG_DRM_TEGRA) += tegra/
 obj-$(CONFIG_DRM_STM) += stm/
 obj-$(CONFIG_DRM_STI) += sti/
 obj-$(CONFIG_DRM_IMX) += imx/
+obj-$(CONFIG_DRM_INGENIC) += ingenic/
 obj-$(CONFIG_DRM_MEDIATEK) += mediatek/
 obj-$(CONFIG_DRM_MESON)	+= meson/
 obj-y			+= i2c/
diff --git a/drivers/gpu/drm/ingenic/Kconfig b/drivers/gpu/drm/ingenic/Kconfig
new file mode 100644
index 000000000000..d82c3d37ec9c
--- /dev/null
+++ b/drivers/gpu/drm/ingenic/Kconfig
@@ -0,0 +1,16 @@
+config DRM_INGENIC
+	tristate "DRM Support for Ingenic SoCs"
+	depends on MIPS || COMPILE_TEST
+	depends on DRM
+	depends on CMA
+	depends on OF
+	select DRM_BRIDGE
+	select DRM_PANEL_BRIDGE
+	select DRM_KMS_HELPER
+	select DRM_KMS_CMA_HELPER
+	select DRM_GEM_CMA_HELPER
+	select VT_HW_CONSOLE_BINDING if FRAMEBUFFER_CONSOLE
+	help
+	  Choose this option for DRM support for the Ingenic SoCs.
+
+	  If M is selected the module will be called ingenic-drm.
diff --git a/drivers/gpu/drm/ingenic/Makefile b/drivers/gpu/drm/ingenic/Makefile
new file mode 100644
index 000000000000..11cac42ce0bb
--- /dev/null
+++ b/drivers/gpu/drm/ingenic/Makefile
@@ -0,0 +1 @@
+obj-$(CONFIG_DRM_INGENIC) += ingenic-drm.o
diff --git a/drivers/gpu/drm/ingenic/ingenic-drm.c b/drivers/gpu/drm/ingenic/ingenic-drm.c
new file mode 100644
index 000000000000..6b52ef2f9790
--- /dev/null
+++ b/drivers/gpu/drm/ingenic/ingenic-drm.c
@@ -0,0 +1,808 @@
+// SPDX-License-Identifier: GPL-2.0
+//
+// Ingenic JZ47xx KMS driver
+//
+// Copyright (C) 2019, Paul Cercueil <paul@crapouillou.net>
+
+#include <linux/clk.h>
+#include <linux/dma-mapping.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+
+#include <drm/drm_atomic.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_crtc.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_drv.h>
+#include <drm/drm_gem_cma_helper.h>
+#include <drm/drm_fb_cma_helper.h>
+#include <drm/drm_fb_helper.h>
+#include <drm/drm_fourcc.h>
+#include <drm/drm_gem_framebuffer_helper.h>
+#include <drm/drm_irq.h>
+#include <drm/drm_of.h>
+#include <drm/drm_panel.h>
+#include <drm/drm_plane.h>
+#include <drm/drm_plane_helper.h>
+#include <drm/drm_probe_helper.h>
+#include <drm/drm_vblank.h>
+
+#include <dt-bindings/display/ingenic,drm.h>
+
+#define JZ_REG_LCD_CFG		0x00
+#define JZ_REG_LCD_VSYNC	0x04
+#define JZ_REG_LCD_HSYNC	0x08
+#define JZ_REG_LCD_VAT		0x0C
+#define JZ_REG_LCD_DAH		0x10
+#define JZ_REG_LCD_DAV		0x14
+#define JZ_REG_LCD_PS		0x18
+#define JZ_REG_LCD_CLS		0x1C
+#define JZ_REG_LCD_SPL		0x20
+#define JZ_REG_LCD_REV		0x24
+#define JZ_REG_LCD_CTRL		0x30
+#define JZ_REG_LCD_STATE	0x34
+#define JZ_REG_LCD_IID		0x38
+#define JZ_REG_LCD_DA0		0x40
+#define JZ_REG_LCD_SA0		0x44
+#define JZ_REG_LCD_FID0		0x48
+#define JZ_REG_LCD_CMD0		0x4C
+#define JZ_REG_LCD_DA1		0x50
+#define JZ_REG_LCD_SA1		0x54
+#define JZ_REG_LCD_FID1		0x58
+#define JZ_REG_LCD_CMD1		0x5C
+
+#define JZ_LCD_CFG_SLCD			BIT(31)
+#define JZ_LCD_CFG_PS_DISABLE		BIT(23)
+#define JZ_LCD_CFG_CLS_DISABLE		BIT(22)
+#define JZ_LCD_CFG_SPL_DISABLE		BIT(21)
+#define JZ_LCD_CFG_REV_DISABLE		BIT(20)
+#define JZ_LCD_CFG_HSYNCM		BIT(19)
+#define JZ_LCD_CFG_PCLKM		BIT(18)
+#define JZ_LCD_CFG_INV			BIT(17)
+#define JZ_LCD_CFG_SYNC_DIR		BIT(16)
+#define JZ_LCD_CFG_PS_POLARITY		BIT(15)
+#define JZ_LCD_CFG_CLS_POLARITY		BIT(14)
+#define JZ_LCD_CFG_SPL_POLARITY		BIT(13)
+#define JZ_LCD_CFG_REV_POLARITY		BIT(12)
+#define JZ_LCD_CFG_HSYNC_ACTIVE_LOW	BIT(11)
+#define JZ_LCD_CFG_PCLK_FALLING_EDGE	BIT(10)
+#define JZ_LCD_CFG_DE_ACTIVE_LOW	BIT(9)
+#define JZ_LCD_CFG_VSYNC_ACTIVE_LOW	BIT(8)
+#define JZ_LCD_CFG_18_BIT		BIT(7)
+#define JZ_LCD_CFG_PDW			(BIT(5) | BIT(4))
+#define JZ_LCD_CFG_MODE_MASK		0xf
+
+#define JZ_LCD_VSYNC_VPS_OFFSET		16
+#define JZ_LCD_VSYNC_VPE_OFFSET		0
+
+#define JZ_LCD_HSYNC_HPS_OFFSET		16
+#define JZ_LCD_HSYNC_HPE_OFFSET		0
+
+#define JZ_LCD_VAT_HT_OFFSET		16
+#define JZ_LCD_VAT_VT_OFFSET		0
+
+#define JZ_LCD_DAH_HDS_OFFSET		16
+#define JZ_LCD_DAH_HDE_OFFSET		0
+
+#define JZ_LCD_DAV_VDS_OFFSET		16
+#define JZ_LCD_DAV_VDE_OFFSET		0
+
+#define JZ_LCD_CTRL_BURST_4		(0x0 << 28)
+#define JZ_LCD_CTRL_BURST_8		(0x1 << 28)
+#define JZ_LCD_CTRL_BURST_16		(0x2 << 28)
+#define JZ_LCD_CTRL_RGB555		BIT(27)
+#define JZ_LCD_CTRL_OFUP		BIT(26)
+#define JZ_LCD_CTRL_FRC_GRAYSCALE_16	(0x0 << 24)
+#define JZ_LCD_CTRL_FRC_GRAYSCALE_4	(0x1 << 24)
+#define JZ_LCD_CTRL_FRC_GRAYSCALE_2	(0x2 << 24)
+#define JZ_LCD_CTRL_PDD_MASK		(0xff << 16)
+#define JZ_LCD_CTRL_EOF_IRQ		BIT(13)
+#define JZ_LCD_CTRL_SOF_IRQ		BIT(12)
+#define JZ_LCD_CTRL_OFU_IRQ		BIT(11)
+#define JZ_LCD_CTRL_IFU0_IRQ		BIT(10)
+#define JZ_LCD_CTRL_IFU1_IRQ		BIT(9)
+#define JZ_LCD_CTRL_DD_IRQ		BIT(8)
+#define JZ_LCD_CTRL_QDD_IRQ		BIT(7)
+#define JZ_LCD_CTRL_REVERSE_ENDIAN	BIT(6)
+#define JZ_LCD_CTRL_LSB_FISRT		BIT(5)
+#define JZ_LCD_CTRL_DISABLE		BIT(4)
+#define JZ_LCD_CTRL_ENABLE		BIT(3)
+#define JZ_LCD_CTRL_BPP_1		0x0
+#define JZ_LCD_CTRL_BPP_2		0x1
+#define JZ_LCD_CTRL_BPP_4		0x2
+#define JZ_LCD_CTRL_BPP_8		0x3
+#define JZ_LCD_CTRL_BPP_15_16		0x4
+#define JZ_LCD_CTRL_BPP_18_24		0x5
+#define JZ_LCD_CTRL_BPP_MASK		(JZ_LCD_CTRL_RGB555 | (0x7 << 0))
+
+#define JZ_LCD_CMD_SOF_IRQ		BIT(31)
+#define JZ_LCD_CMD_EOF_IRQ		BIT(30)
+#define JZ_LCD_CMD_ENABLE_PAL		BIT(28)
+
+#define JZ_LCD_SYNC_MASK		0x3ff
+
+#define JZ_LCD_STATE_EOF_IRQ		BIT(5)
+#define JZ_LCD_STATE_SOF_IRQ		BIT(4)
+#define JZ_LCD_STATE_DISABLED		BIT(0)
+
+struct ingenic_dma_hwdesc {
+	u32 next;
+	u32 addr;
+	u32 id;
+	u32 cmd;
+} __packed;
+
+struct jz_soc_info {
+	bool needs_dev_clk;
+};
+
+struct ingenic_drm {
+	struct drm_device drm;
+	struct drm_plane primary;
+	struct drm_crtc crtc;
+	struct drm_encoder encoder;
+
+	struct device *dev;
+	struct regmap *map;
+	struct clk *lcd_clk, *pix_clk;
+
+	u32 lcd_mode;
+
+	struct ingenic_dma_hwdesc *dma_hwdesc;
+	dma_addr_t dma_hwdesc_phys;
+};
+
+static const u32 ingenic_drm_primary_formats[] = {
+	DRM_FORMAT_XRGB1555,
+	DRM_FORMAT_RGB565,
+	DRM_FORMAT_XRGB8888,
+};
+
+static bool ingenic_drm_writeable_reg(struct device *dev, unsigned int reg)
+{
+	switch (reg) {
+	case JZ_REG_LCD_IID:
+	case JZ_REG_LCD_SA0:
+	case JZ_REG_LCD_FID0:
+	case JZ_REG_LCD_CMD0:
+	case JZ_REG_LCD_SA1:
+	case JZ_REG_LCD_FID1:
+	case JZ_REG_LCD_CMD1:
+		return false;
+	default:
+		return true;
+	}
+}
+
+static const struct regmap_config ingenic_drm_regmap_config = {
+	.reg_bits = 32,
+	.val_bits = 32,
+	.reg_stride = 4,
+
+	.max_register = JZ_REG_LCD_CMD1,
+	.writeable_reg = ingenic_drm_writeable_reg,
+};
+
+static inline struct ingenic_drm *drm_device_get_priv(struct drm_device *drm)
+{
+	return container_of(drm, struct ingenic_drm, drm);
+}
+
+static inline struct ingenic_drm *drm_crtc_get_priv(struct drm_crtc *crtc)
+{
+	return container_of(crtc, struct ingenic_drm, crtc);
+}
+
+static inline struct ingenic_drm *
+drm_encoder_get_priv(struct drm_encoder *encoder)
+{
+	return container_of(encoder, struct ingenic_drm, encoder);
+}
+
+static inline struct ingenic_drm *drm_plane_get_priv(struct drm_plane *plane)
+{
+	return container_of(plane, struct ingenic_drm, primary);
+}
+
+static void ingenic_drm_crtc_atomic_enable(struct drm_crtc *crtc,
+					  struct drm_crtc_state *state)
+{
+	struct ingenic_drm *priv = drm_crtc_get_priv(crtc);
+
+	regmap_write(priv->map, JZ_REG_LCD_STATE, 0);
+
+	regmap_update_bits(priv->map, JZ_REG_LCD_CTRL,
+			   JZ_LCD_CTRL_ENABLE | JZ_LCD_CTRL_DISABLE,
+			   JZ_LCD_CTRL_ENABLE);
+
+	drm_crtc_vblank_on(crtc);
+}
+
+static void ingenic_drm_crtc_atomic_disable(struct drm_crtc *crtc,
+					   struct drm_crtc_state *state)
+{
+	struct ingenic_drm *priv = drm_crtc_get_priv(crtc);
+	unsigned int var;
+
+	drm_crtc_vblank_off(crtc);
+
+	regmap_update_bits(priv->map, JZ_REG_LCD_CTRL,
+			   JZ_LCD_CTRL_DISABLE, JZ_LCD_CTRL_DISABLE);
+
+	regmap_read_poll_timeout(priv->map, JZ_REG_LCD_STATE, var,
+				 var & JZ_LCD_STATE_DISABLED,
+				 1000, 0);
+}
+
+static inline bool ingenic_drm_lcd_is_special_mode(u32 mode)
+{
+	switch (mode) {
+	case JZ_LCD_SPECIAL_TFT_1:
+	case JZ_LCD_SPECIAL_TFT_2:
+	case JZ_LCD_SPECIAL_TFT_3:
+		return true;
+	default:
+		return false;
+	}
+}
+
+static void ingenic_drm_crtc_update_timings(struct ingenic_drm *priv,
+					    struct drm_display_mode *mode)
+{
+	unsigned int vpe, vds, vde, vt, hpe, hds, hde, ht;
+
+	vpe = mode->vsync_end - mode->vsync_start;
+	vds = mode->vtotal - mode->vsync_start;
+	vde = vds + mode->vdisplay;
+	vt = vde + mode->vsync_start - mode->vdisplay;
+
+	hpe = mode->hsync_end - mode->hsync_start;
+	hds = mode->htotal - mode->hsync_start;
+	hde = hds + mode->hdisplay;
+	ht = hde + mode->hsync_start - mode->hdisplay;
+
+	regmap_write(priv->map, JZ_REG_LCD_VSYNC,
+		     0 << JZ_LCD_VSYNC_VPS_OFFSET |
+		     vpe << JZ_LCD_VSYNC_VPE_OFFSET);
+
+	regmap_write(priv->map, JZ_REG_LCD_HSYNC,
+		     0 << JZ_LCD_HSYNC_HPS_OFFSET |
+		     hpe << JZ_LCD_HSYNC_HPE_OFFSET);
+
+	regmap_write(priv->map, JZ_REG_LCD_VAT,
+		     ht << JZ_LCD_VAT_HT_OFFSET |
+		     vt << JZ_LCD_VAT_VT_OFFSET);
+
+	regmap_write(priv->map, JZ_REG_LCD_DAH,
+		     hds << JZ_LCD_DAH_HDS_OFFSET |
+		     hde << JZ_LCD_DAH_HDE_OFFSET);
+	regmap_write(priv->map, JZ_REG_LCD_DAV,
+		     vds << JZ_LCD_DAV_VDS_OFFSET |
+		     vde << JZ_LCD_DAV_VDE_OFFSET);
+
+	if (ingenic_drm_lcd_is_special_mode(priv->lcd_mode)) {
+		regmap_write(priv->map, JZ_REG_LCD_PS, hde << 16 | (hde + 1));
+		regmap_write(priv->map, JZ_REG_LCD_CLS, hde << 16 | (hde + 1));
+		regmap_write(priv->map, JZ_REG_LCD_SPL, hpe << 16 | (hpe + 1));
+		regmap_write(priv->map, JZ_REG_LCD_REV, mode->htotal << 16);
+	}
+}
+
+static void ingenic_drm_crtc_update_ctrl(struct ingenic_drm *priv,
+					 unsigned int bpp)
+{
+	unsigned int ctrl = JZ_LCD_CTRL_OFUP | JZ_LCD_CTRL_BURST_16;
+
+	switch (bpp) {
+	case 1:
+		ctrl |= JZ_LCD_CTRL_BPP_1;
+		break;
+	case 2:
+		ctrl |= JZ_LCD_CTRL_BPP_2;
+		break;
+	case 4:
+		ctrl |= JZ_LCD_CTRL_BPP_4;
+		break;
+	case 8:
+		ctrl |= JZ_LCD_CTRL_BPP_8;
+	break;
+	case 15:
+		ctrl |= JZ_LCD_CTRL_RGB555; /* Falltrough */
+	case 16:
+		ctrl |= JZ_LCD_CTRL_BPP_15_16;
+		break;
+	case 18:
+	case 24:
+	case 32:
+		ctrl |= JZ_LCD_CTRL_BPP_18_24;
+		break;
+	default:
+		break;
+	}
+
+	regmap_update_bits(priv->map, JZ_REG_LCD_CTRL,
+			   JZ_LCD_CTRL_OFUP | JZ_LCD_CTRL_BURST_16 |
+			   JZ_LCD_CTRL_BPP_MASK, ctrl);
+}
+
+static int ingenic_drm_crtc_atomic_check(struct drm_crtc *crtc,
+					 struct drm_crtc_state *state)
+{
+	struct ingenic_drm *priv = drm_crtc_get_priv(crtc);
+	long rate;
+
+	if (!drm_atomic_crtc_needs_modeset(state))
+		return 0;
+
+	rate = clk_round_rate(priv->pix_clk,
+			      state->adjusted_mode.clock * 1000);
+	if (rate < 0)
+		return rate;
+
+	return 0;
+}
+
+static void ingenic_drm_crtc_atomic_flush(struct drm_crtc *crtc,
+					  struct drm_crtc_state *oldstate)
+{
+	struct ingenic_drm *priv = drm_crtc_get_priv(crtc);
+	struct drm_crtc_state *state = crtc->state;
+	struct drm_pending_vblank_event *event = state->event;
+	struct drm_framebuffer *drm_fb = crtc->primary->state->fb;
+	const struct drm_format_info *finfo;
+
+	if (drm_atomic_crtc_needs_modeset(state)) {
+		finfo = drm_format_info(drm_fb->format->format);
+
+		ingenic_drm_crtc_update_timings(priv, &state->mode);
+		ingenic_drm_crtc_update_ctrl(priv, finfo->depth);
+
+		clk_set_rate(priv->pix_clk, state->adjusted_mode.clock * 1000);
+
+		regmap_write(priv->map, JZ_REG_LCD_DA0, priv->dma_hwdesc->next);
+	}
+
+	if (event) {
+		state->event = NULL;
+
+		spin_lock_irq(&crtc->dev->event_lock);
+		if (drm_crtc_vblank_get(crtc) == 0)
+			drm_crtc_arm_vblank_event(crtc, event);
+		else
+			drm_crtc_send_vblank_event(crtc, event);
+		spin_unlock_irq(&crtc->dev->event_lock);
+	}
+}
+
+static void ingenic_drm_plane_atomic_update(struct drm_plane *plane,
+					    struct drm_plane_state *oldstate)
+{
+	struct ingenic_drm *priv = drm_plane_get_priv(plane);
+	struct drm_plane_state *state = plane->state;
+	const struct drm_format_info *finfo;
+	unsigned int width, height;
+
+	finfo = drm_format_info(state->fb->format->format);
+	width = state->crtc->state->adjusted_mode.hdisplay;
+	height = state->crtc->state->adjusted_mode.vdisplay;
+
+	priv->dma_hwdesc->addr = drm_fb_cma_get_gem_addr(state->fb, state, 0);
+
+	priv->dma_hwdesc->cmd = width * height * ((finfo->depth + 7) / 8) / 4;
+	priv->dma_hwdesc->cmd |= JZ_LCD_CMD_EOF_IRQ;
+}
+
+static void ingenic_drm_encoder_atomic_mode_set(struct drm_encoder *encoder,
+						struct drm_crtc_state *crtc_state,
+						struct drm_connector_state *conn_state)
+{
+	struct ingenic_drm *priv = drm_encoder_get_priv(encoder);
+	struct drm_display_mode *mode = &crtc_state->adjusted_mode;
+	u32 bus_flags = conn_state->connector->display_info.bus_flags;
+	unsigned int cfg = priv->lcd_mode;
+
+	if (mode->flags & DRM_MODE_FLAG_NHSYNC)
+		cfg |= JZ_LCD_CFG_HSYNC_ACTIVE_LOW;
+	if (mode->flags & DRM_MODE_FLAG_NVSYNC)
+		cfg |= JZ_LCD_CFG_VSYNC_ACTIVE_LOW;
+	if (bus_flags & DRM_BUS_FLAG_DE_LOW)
+		cfg |= JZ_LCD_CFG_DE_ACTIVE_LOW;
+	if (bus_flags & DRM_BUS_FLAG_PIXDATA_NEGEDGE)
+		cfg |= JZ_LCD_CFG_PCLK_FALLING_EDGE;
+
+	if (ingenic_drm_lcd_is_special_mode(priv->lcd_mode)) {
+		/* TODO: Is that valid for all special modes? */
+		cfg |= JZ_LCD_CFG_REV_POLARITY;
+	} else {
+		cfg |= JZ_LCD_CFG_PS_DISABLE
+		    | JZ_LCD_CFG_CLS_DISABLE
+		    | JZ_LCD_CFG_SPL_DISABLE
+		    | JZ_LCD_CFG_REV_DISABLE;
+	}
+
+	regmap_write(priv->map, JZ_REG_LCD_CFG, cfg);
+}
+
+static irqreturn_t ingenic_drm_irq_handler(int irq, void *arg)
+{
+	struct ingenic_drm *priv = arg;
+	unsigned int state;
+
+	regmap_read(priv->map, JZ_REG_LCD_STATE, &state);
+
+	regmap_update_bits(priv->map, JZ_REG_LCD_STATE,
+			   JZ_LCD_STATE_EOF_IRQ, 0);
+
+	if (state & JZ_LCD_STATE_EOF_IRQ)
+		drm_crtc_handle_vblank(&priv->crtc);
+
+	return IRQ_HANDLED;
+}
+
+static void ingenic_drm_release(struct drm_device *drm)
+{
+	struct ingenic_drm *priv = drm_device_get_priv(drm);
+
+	drm_mode_config_cleanup(drm);
+	drm_dev_fini(drm);
+	kfree(priv);
+}
+
+static int ingenic_drm_enable_vblank(struct drm_crtc *crtc)
+{
+	struct ingenic_drm *priv = drm_crtc_get_priv(crtc);
+
+	regmap_update_bits(priv->map, JZ_REG_LCD_CTRL,
+			   JZ_LCD_CTRL_EOF_IRQ, JZ_LCD_CTRL_EOF_IRQ);
+
+	return 0;
+}
+
+static void ingenic_drm_disable_vblank(struct drm_crtc *crtc)
+{
+	struct ingenic_drm *priv = drm_crtc_get_priv(crtc);
+
+	regmap_update_bits(priv->map, JZ_REG_LCD_CTRL, JZ_LCD_CTRL_EOF_IRQ, 0);
+}
+
+DEFINE_DRM_GEM_CMA_FOPS(ingenic_drm_fops);
+
+static struct drm_driver ingenic_drm_driver_data = {
+	.driver_features	= DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME
+				| DRIVER_ATOMIC,
+	.name			= "ingenic-drm",
+	.desc			= "DRM module for Ingenic SoCs",
+	.date			= "20190228",
+	.major			= 1,
+	.minor			= 0,
+	.patchlevel		= 0,
+
+	.fops			= &ingenic_drm_fops,
+
+	.dumb_create		= drm_gem_cma_dumb_create,
+	.gem_free_object_unlocked = drm_gem_cma_free_object,
+	.gem_vm_ops		= &drm_gem_cma_vm_ops,
+
+	.prime_handle_to_fd	= drm_gem_prime_handle_to_fd,
+	.prime_fd_to_handle	= drm_gem_prime_fd_to_handle,
+	.gem_prime_get_sg_table	= drm_gem_cma_prime_get_sg_table,
+	.gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
+	.gem_prime_vmap		= drm_gem_cma_prime_vmap,
+	.gem_prime_vunmap	= drm_gem_cma_prime_vunmap,
+	.gem_prime_mmap		= drm_gem_cma_prime_mmap,
+
+	.irq_handler		= ingenic_drm_irq_handler,
+	.release			= ingenic_drm_release,
+};
+
+static const struct drm_plane_funcs ingenic_drm_primary_plane_funcs = {
+	.update_plane		= drm_atomic_helper_update_plane,
+	.disable_plane		= drm_atomic_helper_disable_plane,
+	.reset			= drm_atomic_helper_plane_reset,
+	.destroy		= drm_plane_cleanup,
+
+	.atomic_duplicate_state	= drm_atomic_helper_plane_duplicate_state,
+	.atomic_destroy_state	= drm_atomic_helper_plane_destroy_state,
+};
+
+static const struct drm_crtc_funcs ingenic_drm_crtc_funcs = {
+	.set_config		= drm_atomic_helper_set_config,
+	.page_flip		= drm_atomic_helper_page_flip,
+	.reset			= drm_atomic_helper_crtc_reset,
+	.destroy		= drm_crtc_cleanup,
+
+	.atomic_duplicate_state	= drm_atomic_helper_crtc_duplicate_state,
+	.atomic_destroy_state	= drm_atomic_helper_crtc_destroy_state,
+
+	.enable_vblank		= ingenic_drm_enable_vblank,
+	.disable_vblank		= ingenic_drm_disable_vblank,
+
+	.gamma_set		= drm_atomic_helper_legacy_gamma_set,
+};
+
+static const struct drm_plane_helper_funcs ingenic_drm_plane_helper_funcs = {
+	.atomic_update		= ingenic_drm_plane_atomic_update,
+	.prepare_fb		= drm_gem_fb_prepare_fb,
+};
+
+static const struct drm_crtc_helper_funcs ingenic_drm_crtc_helper_funcs = {
+	.atomic_enable		= ingenic_drm_crtc_atomic_enable,
+	.atomic_disable		= ingenic_drm_crtc_atomic_disable,
+	.atomic_flush		= ingenic_drm_crtc_atomic_flush,
+	.atomic_check		= ingenic_drm_crtc_atomic_check,
+};
+
+static const struct drm_encoder_helper_funcs ingenic_drm_encoder_helper_funcs = {
+	.atomic_mode_set	= ingenic_drm_encoder_atomic_mode_set,
+};
+
+static const struct drm_mode_config_funcs ingenic_drm_mode_config_funcs = {
+	.fb_create		= drm_gem_fb_create,
+	.output_poll_changed	= drm_fb_helper_output_poll_changed,
+	.atomic_check		= drm_atomic_helper_check,
+	.atomic_commit		= drm_atomic_helper_commit,
+};
+
+static const struct drm_encoder_funcs ingenic_drm_encoder_funcs = {
+	.destroy		= drm_encoder_cleanup,
+};
+
+static void ingenic_drm_free_dma_hwdesc(void *d)
+{
+	struct ingenic_drm *priv = d;
+
+	dma_free_coherent(priv->dev, sizeof(*priv->dma_hwdesc),
+			  priv->dma_hwdesc, priv->dma_hwdesc_phys);
+}
+
+static int ingenic_drm_probe(struct platform_device *pdev)
+{
+	const struct jz_soc_info *soc_info;
+	struct device *dev = &pdev->dev;
+	struct ingenic_drm *priv;
+	struct clk *parent_clk;
+	struct drm_bridge *bridge;
+	struct drm_panel *panel;
+	struct drm_device *drm;
+	struct resource *mem;
+	void __iomem *base;
+	long parent_rate;
+	int ret, irq;
+
+	soc_info = of_device_get_match_data(dev);
+	if (!soc_info) {
+		dev_err(dev, "Missing platform data\n");
+		return -EINVAL;
+	}
+
+	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	priv->dev = dev;
+	drm = &priv->drm;
+	drm->dev_private = priv;
+
+	platform_set_drvdata(pdev, priv);
+
+	ret = devm_drm_dev_init(dev, drm, &ingenic_drm_driver_data);
+	if (ret) {
+		kfree(priv);
+		return ret;
+	}
+
+	drm_mode_config_init(drm);
+	drm->mode_config.min_width = 0;
+	drm->mode_config.min_height = 0;
+	drm->mode_config.max_width = 800;
+	drm->mode_config.max_height = 600;
+	drm->mode_config.funcs = &ingenic_drm_mode_config_funcs;
+
+	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	base = devm_ioremap_resource(dev, mem);
+	if (IS_ERR(base)) {
+		dev_err(dev, "Failed to get memory resource");
+		return PTR_ERR(base);
+	}
+
+	priv->map = devm_regmap_init_mmio(dev, base,
+					  &ingenic_drm_regmap_config);
+	if (IS_ERR(priv->map)) {
+		dev_err(dev, "Failed to create regmap");
+		return PTR_ERR(priv->map);
+	}
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0) {
+		dev_err(dev, "Failed to get platform irq");
+		return irq;
+	}
+
+	if (soc_info->needs_dev_clk) {
+		priv->lcd_clk = devm_clk_get(dev, "lcd");
+		if (IS_ERR(priv->lcd_clk)) {
+			dev_err(dev, "Failed to get lcd clock");
+			return PTR_ERR(priv->lcd_clk);
+		}
+	}
+
+	priv->pix_clk = devm_clk_get(dev, "lcd_pclk");
+	if (IS_ERR(priv->pix_clk)) {
+		dev_err(dev, "Failed to get pixel clock");
+		return PTR_ERR(priv->pix_clk);
+	}
+
+	ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0, &panel, &bridge);
+	if (ret) {
+		if (ret != -EPROBE_DEFER)
+			dev_err(dev, "Failed to get panel handle");
+		return ret;
+	}
+
+	if (panel) {
+		bridge = devm_drm_panel_bridge_add(dev, panel,
+						   DRM_MODE_CONNECTOR_Unknown);
+	}
+
+	if (bridge) {
+		of_property_read_u32(bridge->of_node, "ingenic,lcd-mode",
+				     &priv->lcd_mode);
+	}
+
+	priv->dma_hwdesc = dma_alloc_coherent(dev, sizeof(*priv->dma_hwdesc),
+					      &priv->dma_hwdesc_phys,
+					      GFP_KERNEL);
+	if (!priv->dma_hwdesc)
+		return -ENOMEM;
+
+	ret = devm_add_action_or_reset(dev, ingenic_drm_free_dma_hwdesc, priv);
+	if (ret)
+		return ret;
+
+	priv->dma_hwdesc->next = priv->dma_hwdesc_phys;
+	priv->dma_hwdesc->id = 0xdeafbead;
+
+	drm_plane_helper_add(&priv->primary, &ingenic_drm_plane_helper_funcs);
+
+	ret = drm_universal_plane_init(drm, &priv->primary,
+				       0, &ingenic_drm_primary_plane_funcs,
+				       ingenic_drm_primary_formats,
+				       ARRAY_SIZE(ingenic_drm_primary_formats),
+				       NULL, DRM_PLANE_TYPE_PRIMARY, NULL);
+	if (ret) {
+		dev_err(dev, "Failed to register primary plane: %i", ret);
+		return ret;
+	}
+
+	drm_crtc_helper_add(&priv->crtc, &ingenic_drm_crtc_helper_funcs);
+
+	ret = drm_crtc_init_with_planes(drm, &priv->crtc, &priv->primary,
+					NULL, &ingenic_drm_crtc_funcs, NULL);
+	if (ret) {
+		dev_err(dev, "Failed to init CRTC: %i", ret);
+		return ret;
+	}
+
+	priv->encoder.possible_crtcs = 1;
+
+	drm_encoder_helper_add(&priv->encoder,
+			       &ingenic_drm_encoder_helper_funcs);
+
+	ret = drm_encoder_init(drm, &priv->encoder, &ingenic_drm_encoder_funcs,
+			       DRM_MODE_ENCODER_DPI, NULL);
+	if (ret) {
+		dev_err(dev, "Failed to init encoder: %i", ret);
+		return ret;
+	}
+
+	ret = drm_bridge_attach(&priv->encoder, bridge, NULL);
+	if (ret) {
+		dev_err(dev, "Unable to attach bridge");
+		return ret;
+	}
+
+	ret = drm_irq_install(drm, irq);
+	if (ret) {
+		dev_err(dev, "Unable to install IRQ handler");
+		return ret;
+	}
+
+	ret = drm_vblank_init(drm, 1);
+	if (ret) {
+		dev_err(dev, "Failed calling drm_vblank_init()");
+		return ret;
+	}
+
+	drm_mode_config_reset(drm);
+
+	ret = clk_prepare_enable(priv->pix_clk);
+	if (ret) {
+		dev_err(dev, "Unable to start pixel clock");
+		return ret;
+	}
+
+	if (priv->lcd_clk) {
+		parent_clk = clk_get_parent(priv->lcd_clk);
+		parent_rate = clk_get_rate(parent_clk);
+
+		/* LCD Device clock must be 3x the pixel clock for STN panels,
+		 * or 1.5x the pixel clock for TFT panels. To avoid having to
+		 * check for the LCD device clock everytime we do a mode change,
+		 * we set the LCD device clock to the highest rate possible.
+		 */
+		ret = clk_set_rate(priv->lcd_clk, parent_rate);
+		if (ret) {
+			dev_err(dev, "Unable to set LCD clock rate");
+			goto err_pixclk_disable;
+		}
+
+		ret = clk_prepare_enable(priv->lcd_clk);
+		if (ret) {
+			dev_err(dev, "Unable to start lcd clock");
+			goto err_pixclk_disable;
+		}
+	}
+
+	ret = drm_dev_register(drm, 0);
+	if (ret) {
+		dev_err(dev, "Failed to register DRM driver");
+		goto err_devclk_disable;
+	}
+
+	ret = drm_fbdev_generic_setup(drm, 16);
+	if (ret)
+		dev_warn(dev, "Unable to start fbdev emulation: %i", ret);
+
+	return 0;
+
+err_devclk_disable:
+	if (priv->lcd_clk)
+		clk_disable_unprepare(priv->lcd_clk);
+err_pixclk_disable:
+	clk_disable_unprepare(priv->pix_clk);
+	return ret;
+}
+
+static int ingenic_drm_remove(struct platform_device *pdev)
+{
+	struct ingenic_drm *priv = platform_get_drvdata(pdev);
+
+	if (priv->lcd_clk)
+		clk_disable_unprepare(priv->lcd_clk);
+	clk_disable_unprepare(priv->pix_clk);
+
+	drm_dev_unregister(&priv->drm);
+	drm_atomic_helper_shutdown(&priv->drm);
+
+	return 0;
+}
+
+static const struct jz_soc_info jz4740_soc_info = {
+	.needs_dev_clk = true,
+};
+
+static const struct jz_soc_info jz4725b_soc_info = {
+	.needs_dev_clk = false,
+};
+
+static const struct of_device_id ingenic_drm_of_match[] = {
+	{ .compatible = "ingenic,jz4740-lcd", .data = &jz4740_soc_info },
+	{ .compatible = "ingenic,jz4725b-lcd", .data = &jz4725b_soc_info },
+	{ /* sentinel */ },
+};
+
+static struct platform_driver ingenic_drm_driver = {
+	.driver = {
+		.name = "ingenic-drm",
+		.of_match_table = of_match_ptr(ingenic_drm_of_match),
+	},
+	.probe = ingenic_drm_probe,
+	.remove = ingenic_drm_remove,
+};
+module_platform_driver(ingenic_drm_driver);
+
+MODULE_AUTHOR("Paul Cercueil <paul@crapouillou.net>");
+MODULE_DESCRIPTION("DRM driver for the Ingenic SoCs\n");
+MODULE_LICENSE("GPL v2");
-- 
2.11.0

Re: [PATCH v3 3/3] DRM: Add KMS driver for the Ingenic JZ47xx SoCs

[Daniel Vetter]

On Sun, Apr 14, 2019 at 10:08:24PM +0200, Paul Cercueil wrote:
> Add a KMS driver for the Ingenic JZ47xx family of SoCs.
> This driver is meant to replace the aging jz4740-fb driver.
> 
> Signed-off-by: Paul Cercueil <paul@crapouillou.net>
> Tested-by: Artur Rojek <contact@artur-rojek.eu>

Please put somewhere in your commit message why you're not using the
simple pipe helpers - I had to recheck that from previous discussions :-)
-Daniel

> ---
> 
> Notes:
>     v2: - Remove custom handling of panel. The panel is now discovered using
>     	  the standard API.
>     	- Lots of small tweaks suggested by upstream
>     
>     v3: - Use devm_drm_dev_init()
>         - Update compatible strings to -lcd instead of -drm
>     	- Add destroy() callbacks to plane and crtc
>     	- The ingenic,lcd-mode is now read from the bridge's DT node
> 
>  drivers/gpu/drm/Kconfig               |   2 +
>  drivers/gpu/drm/Makefile              |   1 +
>  drivers/gpu/drm/ingenic/Kconfig       |  16 +
>  drivers/gpu/drm/ingenic/Makefile      |   1 +
>  drivers/gpu/drm/ingenic/ingenic-drm.c | 808 ++++++++++++++++++++++++++++++++++
>  5 files changed, 828 insertions(+)
>  create mode 100644 drivers/gpu/drm/ingenic/Kconfig
>  create mode 100644 drivers/gpu/drm/ingenic/Makefile
>  create mode 100644 drivers/gpu/drm/ingenic/ingenic-drm.c
> 
> diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
> index 39d5f7562f1c..6863223c61d5 100644
> --- a/drivers/gpu/drm/Kconfig
> +++ b/drivers/gpu/drm/Kconfig
> @@ -307,6 +307,8 @@ source "drivers/gpu/drm/sti/Kconfig"
>  
>  source "drivers/gpu/drm/imx/Kconfig"
>  
> +source "drivers/gpu/drm/ingenic/Kconfig"
> +
>  source "drivers/gpu/drm/v3d/Kconfig"
>  
>  source "drivers/gpu/drm/vc4/Kconfig"
> diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
> index 3d0c75cd687c..1c2aca7965bd 100644
> --- a/drivers/gpu/drm/Makefile
> +++ b/drivers/gpu/drm/Makefile
> @@ -95,6 +95,7 @@ obj-$(CONFIG_DRM_TEGRA) += tegra/
>  obj-$(CONFIG_DRM_STM) += stm/
>  obj-$(CONFIG_DRM_STI) += sti/
>  obj-$(CONFIG_DRM_IMX) += imx/
> +obj-$(CONFIG_DRM_INGENIC) += ingenic/
>  obj-$(CONFIG_DRM_MEDIATEK) += mediatek/
>  obj-$(CONFIG_DRM_MESON)	+= meson/
>  obj-y			+= i2c/
> diff --git a/drivers/gpu/drm/ingenic/Kconfig b/drivers/gpu/drm/ingenic/Kconfig
> new file mode 100644
> index 000000000000..d82c3d37ec9c
> --- /dev/null
> +++ b/drivers/gpu/drm/ingenic/Kconfig
> @@ -0,0 +1,16 @@
> +config DRM_INGENIC
> +	tristate "DRM Support for Ingenic SoCs"
> +	depends on MIPS || COMPILE_TEST
> +	depends on DRM
> +	depends on CMA
> +	depends on OF
> +	select DRM_BRIDGE
> +	select DRM_PANEL_BRIDGE
> +	select DRM_KMS_HELPER
> +	select DRM_KMS_CMA_HELPER
> +	select DRM_GEM_CMA_HELPER
> +	select VT_HW_CONSOLE_BINDING if FRAMEBUFFER_CONSOLE
> +	help
> +	  Choose this option for DRM support for the Ingenic SoCs.
> +
> +	  If M is selected the module will be called ingenic-drm.
> diff --git a/drivers/gpu/drm/ingenic/Makefile b/drivers/gpu/drm/ingenic/Makefile
> new file mode 100644
> index 000000000000..11cac42ce0bb
> --- /dev/null
> +++ b/drivers/gpu/drm/ingenic/Makefile
> @@ -0,0 +1 @@
> +obj-$(CONFIG_DRM_INGENIC) += ingenic-drm.o
> diff --git a/drivers/gpu/drm/ingenic/ingenic-drm.c b/drivers/gpu/drm/ingenic/ingenic-drm.c
> new file mode 100644
> index 000000000000..6b52ef2f9790
> --- /dev/null
> +++ b/drivers/gpu/drm/ingenic/ingenic-drm.c
> @@ -0,0 +1,808 @@
> +// SPDX-License-Identifier: GPL-2.0
> +//
> +// Ingenic JZ47xx KMS driver
> +//
> +// Copyright (C) 2019, Paul Cercueil <paul@crapouillou.net>
> +
> +#include <linux/clk.h>
> +#include <linux/dma-mapping.h>
> +#include <linux/module.h>
> +#include <linux/of_device.h>
> +#include <linux/platform_device.h>
> +#include <linux/regmap.h>
> +
> +#include <drm/drm_atomic.h>
> +#include <drm/drm_atomic_helper.h>
> +#include <drm/drm_crtc.h>
> +#include <drm/drm_crtc_helper.h>
> +#include <drm/drm_drv.h>
> +#include <drm/drm_gem_cma_helper.h>
> +#include <drm/drm_fb_cma_helper.h>
> +#include <drm/drm_fb_helper.h>
> +#include <drm/drm_fourcc.h>
> +#include <drm/drm_gem_framebuffer_helper.h>
> +#include <drm/drm_irq.h>
> +#include <drm/drm_of.h>
> +#include <drm/drm_panel.h>
> +#include <drm/drm_plane.h>
> +#include <drm/drm_plane_helper.h>
> +#include <drm/drm_probe_helper.h>
> +#include <drm/drm_vblank.h>
> +
> +#include <dt-bindings/display/ingenic,drm.h>
> +
> +#define JZ_REG_LCD_CFG		0x00
> +#define JZ_REG_LCD_VSYNC	0x04
> +#define JZ_REG_LCD_HSYNC	0x08
> +#define JZ_REG_LCD_VAT		0x0C
> +#define JZ_REG_LCD_DAH		0x10
> +#define JZ_REG_LCD_DAV		0x14
> +#define JZ_REG_LCD_PS		0x18
> +#define JZ_REG_LCD_CLS		0x1C
> +#define JZ_REG_LCD_SPL		0x20
> +#define JZ_REG_LCD_REV		0x24
> +#define JZ_REG_LCD_CTRL		0x30
> +#define JZ_REG_LCD_STATE	0x34
> +#define JZ_REG_LCD_IID		0x38
> +#define JZ_REG_LCD_DA0		0x40
> +#define JZ_REG_LCD_SA0		0x44
> +#define JZ_REG_LCD_FID0		0x48
> +#define JZ_REG_LCD_CMD0		0x4C
> +#define JZ_REG_LCD_DA1		0x50
> +#define JZ_REG_LCD_SA1		0x54
> +#define JZ_REG_LCD_FID1		0x58
> +#define JZ_REG_LCD_CMD1		0x5C
> +
> +#define JZ_LCD_CFG_SLCD			BIT(31)
> +#define JZ_LCD_CFG_PS_DISABLE		BIT(23)
> +#define JZ_LCD_CFG_CLS_DISABLE		BIT(22)
> +#define JZ_LCD_CFG_SPL_DISABLE		BIT(21)
> +#define JZ_LCD_CFG_REV_DISABLE		BIT(20)
> +#define JZ_LCD_CFG_HSYNCM		BIT(19)
> +#define JZ_LCD_CFG_PCLKM		BIT(18)
> +#define JZ_LCD_CFG_INV			BIT(17)
> +#define JZ_LCD_CFG_SYNC_DIR		BIT(16)
> +#define JZ_LCD_CFG_PS_POLARITY		BIT(15)
> +#define JZ_LCD_CFG_CLS_POLARITY		BIT(14)
> +#define JZ_LCD_CFG_SPL_POLARITY		BIT(13)
> +#define JZ_LCD_CFG_REV_POLARITY		BIT(12)
> +#define JZ_LCD_CFG_HSYNC_ACTIVE_LOW	BIT(11)
> +#define JZ_LCD_CFG_PCLK_FALLING_EDGE	BIT(10)
> +#define JZ_LCD_CFG_DE_ACTIVE_LOW	BIT(9)
> +#define JZ_LCD_CFG_VSYNC_ACTIVE_LOW	BIT(8)
> +#define JZ_LCD_CFG_18_BIT		BIT(7)
> +#define JZ_LCD_CFG_PDW			(BIT(5) | BIT(4))
> +#define JZ_LCD_CFG_MODE_MASK		0xf
> +
> +#define JZ_LCD_VSYNC_VPS_OFFSET		16
> +#define JZ_LCD_VSYNC_VPE_OFFSET		0
> +
> +#define JZ_LCD_HSYNC_HPS_OFFSET		16
> +#define JZ_LCD_HSYNC_HPE_OFFSET		0
> +
> +#define JZ_LCD_VAT_HT_OFFSET		16
> +#define JZ_LCD_VAT_VT_OFFSET		0
> +
> +#define JZ_LCD_DAH_HDS_OFFSET		16
> +#define JZ_LCD_DAH_HDE_OFFSET		0
> +
> +#define JZ_LCD_DAV_VDS_OFFSET		16
> +#define JZ_LCD_DAV_VDE_OFFSET		0
> +
> +#define JZ_LCD_CTRL_BURST_4		(0x0 << 28)
> +#define JZ_LCD_CTRL_BURST_8		(0x1 << 28)
> +#define JZ_LCD_CTRL_BURST_16		(0x2 << 28)
> +#define JZ_LCD_CTRL_RGB555		BIT(27)
> +#define JZ_LCD_CTRL_OFUP		BIT(26)
> +#define JZ_LCD_CTRL_FRC_GRAYSCALE_16	(0x0 << 24)
> +#define JZ_LCD_CTRL_FRC_GRAYSCALE_4	(0x1 << 24)
> +#define JZ_LCD_CTRL_FRC_GRAYSCALE_2	(0x2 << 24)
> +#define JZ_LCD_CTRL_PDD_MASK		(0xff << 16)
> +#define JZ_LCD_CTRL_EOF_IRQ		BIT(13)
> +#define JZ_LCD_CTRL_SOF_IRQ		BIT(12)
> +#define JZ_LCD_CTRL_OFU_IRQ		BIT(11)
> +#define JZ_LCD_CTRL_IFU0_IRQ		BIT(10)
> +#define JZ_LCD_CTRL_IFU1_IRQ		BIT(9)
> +#define JZ_LCD_CTRL_DD_IRQ		BIT(8)
> +#define JZ_LCD_CTRL_QDD_IRQ		BIT(7)
> +#define JZ_LCD_CTRL_REVERSE_ENDIAN	BIT(6)
> +#define JZ_LCD_CTRL_LSB_FISRT		BIT(5)
> +#define JZ_LCD_CTRL_DISABLE		BIT(4)
> +#define JZ_LCD_CTRL_ENABLE		BIT(3)
> +#define JZ_LCD_CTRL_BPP_1		0x0
> +#define JZ_LCD_CTRL_BPP_2		0x1
> +#define JZ_LCD_CTRL_BPP_4		0x2
> +#define JZ_LCD_CTRL_BPP_8		0x3
> +#define JZ_LCD_CTRL_BPP_15_16		0x4
> +#define JZ_LCD_CTRL_BPP_18_24		0x5
> +#define JZ_LCD_CTRL_BPP_MASK		(JZ_LCD_CTRL_RGB555 | (0x7 << 0))
> +
> +#define JZ_LCD_CMD_SOF_IRQ		BIT(31)
> +#define JZ_LCD_CMD_EOF_IRQ		BIT(30)
> +#define JZ_LCD_CMD_ENABLE_PAL		BIT(28)
> +
> +#define JZ_LCD_SYNC_MASK		0x3ff
> +
> +#define JZ_LCD_STATE_EOF_IRQ		BIT(5)
> +#define JZ_LCD_STATE_SOF_IRQ		BIT(4)
> +#define JZ_LCD_STATE_DISABLED		BIT(0)
> +
> +struct ingenic_dma_hwdesc {
> +	u32 next;
> +	u32 addr;
> +	u32 id;
> +	u32 cmd;
> +} __packed;
> +
> +struct jz_soc_info {
> +	bool needs_dev_clk;
> +};
> +
> +struct ingenic_drm {
> +	struct drm_device drm;
> +	struct drm_plane primary;
> +	struct drm_crtc crtc;
> +	struct drm_encoder encoder;
> +
> +	struct device *dev;
> +	struct regmap *map;
> +	struct clk *lcd_clk, *pix_clk;
> +
> +	u32 lcd_mode;
> +
> +	struct ingenic_dma_hwdesc *dma_hwdesc;
> +	dma_addr_t dma_hwdesc_phys;
> +};
> +
> +static const u32 ingenic_drm_primary_formats[] = {
> +	DRM_FORMAT_XRGB1555,
> +	DRM_FORMAT_RGB565,
> +	DRM_FORMAT_XRGB8888,
> +};
> +
> +static bool ingenic_drm_writeable_reg(struct device *dev, unsigned int reg)
> +{
> +	switch (reg) {
> +	case JZ_REG_LCD_IID:
> +	case JZ_REG_LCD_SA0:
> +	case JZ_REG_LCD_FID0:
> +	case JZ_REG_LCD_CMD0:
> +	case JZ_REG_LCD_SA1:
> +	case JZ_REG_LCD_FID1:
> +	case JZ_REG_LCD_CMD1:
> +		return false;
> +	default:
> +		return true;
> +	}
> +}
> +
> +static const struct regmap_config ingenic_drm_regmap_config = {
> +	.reg_bits = 32,
> +	.val_bits = 32,
> +	.reg_stride = 4,
> +
> +	.max_register = JZ_REG_LCD_CMD1,
> +	.writeable_reg = ingenic_drm_writeable_reg,
> +};
> +
> +static inline struct ingenic_drm *drm_device_get_priv(struct drm_device *drm)
> +{
> +	return container_of(drm, struct ingenic_drm, drm);
> +}
> +
> +static inline struct ingenic_drm *drm_crtc_get_priv(struct drm_crtc *crtc)
> +{
> +	return container_of(crtc, struct ingenic_drm, crtc);
> +}
> +
> +static inline struct ingenic_drm *
> +drm_encoder_get_priv(struct drm_encoder *encoder)
> +{
> +	return container_of(encoder, struct ingenic_drm, encoder);
> +}
> +
> +static inline struct ingenic_drm *drm_plane_get_priv(struct drm_plane *plane)
> +{
> +	return container_of(plane, struct ingenic_drm, primary);
> +}
> +
> +static void ingenic_drm_crtc_atomic_enable(struct drm_crtc *crtc,
> +					  struct drm_crtc_state *state)
> +{
> +	struct ingenic_drm *priv = drm_crtc_get_priv(crtc);
> +
> +	regmap_write(priv->map, JZ_REG_LCD_STATE, 0);
> +
> +	regmap_update_bits(priv->map, JZ_REG_LCD_CTRL,
> +			   JZ_LCD_CTRL_ENABLE | JZ_LCD_CTRL_DISABLE,
> +			   JZ_LCD_CTRL_ENABLE);
> +
> +	drm_crtc_vblank_on(crtc);
> +}
> +
> +static void ingenic_drm_crtc_atomic_disable(struct drm_crtc *crtc,
> +					   struct drm_crtc_state *state)
> +{
> +	struct ingenic_drm *priv = drm_crtc_get_priv(crtc);
> +	unsigned int var;
> +
> +	drm_crtc_vblank_off(crtc);
> +
> +	regmap_update_bits(priv->map, JZ_REG_LCD_CTRL,
> +			   JZ_LCD_CTRL_DISABLE, JZ_LCD_CTRL_DISABLE);
> +
> +	regmap_read_poll_timeout(priv->map, JZ_REG_LCD_STATE, var,
> +				 var & JZ_LCD_STATE_DISABLED,
> +				 1000, 0);
> +}
> +
> +static inline bool ingenic_drm_lcd_is_special_mode(u32 mode)
> +{
> +	switch (mode) {
> +	case JZ_LCD_SPECIAL_TFT_1:
> +	case JZ_LCD_SPECIAL_TFT_2:
> +	case JZ_LCD_SPECIAL_TFT_3:
> +		return true;
> +	default:
> +		return false;
> +	}
> +}
> +
> +static void ingenic_drm_crtc_update_timings(struct ingenic_drm *priv,
> +					    struct drm_display_mode *mode)
> +{
> +	unsigned int vpe, vds, vde, vt, hpe, hds, hde, ht;
> +
> +	vpe = mode->vsync_end - mode->vsync_start;
> +	vds = mode->vtotal - mode->vsync_start;
> +	vde = vds + mode->vdisplay;
> +	vt = vde + mode->vsync_start - mode->vdisplay;
> +
> +	hpe = mode->hsync_end - mode->hsync_start;
> +	hds = mode->htotal - mode->hsync_start;
> +	hde = hds + mode->hdisplay;
> +	ht = hde + mode->hsync_start - mode->hdisplay;
> +
> +	regmap_write(priv->map, JZ_REG_LCD_VSYNC,
> +		     0 << JZ_LCD_VSYNC_VPS_OFFSET |
> +		     vpe << JZ_LCD_VSYNC_VPE_OFFSET);
> +
> +	regmap_write(priv->map, JZ_REG_LCD_HSYNC,
> +		     0 << JZ_LCD_HSYNC_HPS_OFFSET |
> +		     hpe << JZ_LCD_HSYNC_HPE_OFFSET);
> +
> +	regmap_write(priv->map, JZ_REG_LCD_VAT,
> +		     ht << JZ_LCD_VAT_HT_OFFSET |
> +		     vt << JZ_LCD_VAT_VT_OFFSET);
> +
> +	regmap_write(priv->map, JZ_REG_LCD_DAH,
> +		     hds << JZ_LCD_DAH_HDS_OFFSET |
> +		     hde << JZ_LCD_DAH_HDE_OFFSET);
> +	regmap_write(priv->map, JZ_REG_LCD_DAV,
> +		     vds << JZ_LCD_DAV_VDS_OFFSET |
> +		     vde << JZ_LCD_DAV_VDE_OFFSET);
> +
> +	if (ingenic_drm_lcd_is_special_mode(priv->lcd_mode)) {
> +		regmap_write(priv->map, JZ_REG_LCD_PS, hde << 16 | (hde + 1));
> +		regmap_write(priv->map, JZ_REG_LCD_CLS, hde << 16 | (hde + 1));
> +		regmap_write(priv->map, JZ_REG_LCD_SPL, hpe << 16 | (hpe + 1));
> +		regmap_write(priv->map, JZ_REG_LCD_REV, mode->htotal << 16);
> +	}
> +}
> +
> +static void ingenic_drm_crtc_update_ctrl(struct ingenic_drm *priv,
> +					 unsigned int bpp)
> +{
> +	unsigned int ctrl = JZ_LCD_CTRL_OFUP | JZ_LCD_CTRL_BURST_16;
> +
> +	switch (bpp) {
> +	case 1:
> +		ctrl |= JZ_LCD_CTRL_BPP_1;
> +		break;
> +	case 2:
> +		ctrl |= JZ_LCD_CTRL_BPP_2;
> +		break;
> +	case 4:
> +		ctrl |= JZ_LCD_CTRL_BPP_4;
> +		break;
> +	case 8:
> +		ctrl |= JZ_LCD_CTRL_BPP_8;
> +	break;
> +	case 15:
> +		ctrl |= JZ_LCD_CTRL_RGB555; /* Falltrough */
> +	case 16:
> +		ctrl |= JZ_LCD_CTRL_BPP_15_16;
> +		break;
> +	case 18:
> +	case 24:
> +	case 32:
> +		ctrl |= JZ_LCD_CTRL_BPP_18_24;
> +		break;
> +	default:
> +		break;
> +	}
> +
> +	regmap_update_bits(priv->map, JZ_REG_LCD_CTRL,
> +			   JZ_LCD_CTRL_OFUP | JZ_LCD_CTRL_BURST_16 |
> +			   JZ_LCD_CTRL_BPP_MASK, ctrl);
> +}
> +
> +static int ingenic_drm_crtc_atomic_check(struct drm_crtc *crtc,
> +					 struct drm_crtc_state *state)
> +{
> +	struct ingenic_drm *priv = drm_crtc_get_priv(crtc);
> +	long rate;
> +
> +	if (!drm_atomic_crtc_needs_modeset(state))
> +		return 0;
> +
> +	rate = clk_round_rate(priv->pix_clk,
> +			      state->adjusted_mode.clock * 1000);
> +	if (rate < 0)
> +		return rate;
> +
> +	return 0;
> +}
> +
> +static void ingenic_drm_crtc_atomic_flush(struct drm_crtc *crtc,
> +					  struct drm_crtc_state *oldstate)
> +{
> +	struct ingenic_drm *priv = drm_crtc_get_priv(crtc);
> +	struct drm_crtc_state *state = crtc->state;
> +	struct drm_pending_vblank_event *event = state->event;
> +	struct drm_framebuffer *drm_fb = crtc->primary->state->fb;
> +	const struct drm_format_info *finfo;
> +
> +	if (drm_atomic_crtc_needs_modeset(state)) {
> +		finfo = drm_format_info(drm_fb->format->format);
> +
> +		ingenic_drm_crtc_update_timings(priv, &state->mode);
> +		ingenic_drm_crtc_update_ctrl(priv, finfo->depth);
> +
> +		clk_set_rate(priv->pix_clk, state->adjusted_mode.clock * 1000);
> +
> +		regmap_write(priv->map, JZ_REG_LCD_DA0, priv->dma_hwdesc->next);
> +	}
> +
> +	if (event) {
> +		state->event = NULL;
> +
> +		spin_lock_irq(&crtc->dev->event_lock);
> +		if (drm_crtc_vblank_get(crtc) == 0)
> +			drm_crtc_arm_vblank_event(crtc, event);
> +		else
> +			drm_crtc_send_vblank_event(crtc, event);
> +		spin_unlock_irq(&crtc->dev->event_lock);
> +	}
> +}
> +
> +static void ingenic_drm_plane_atomic_update(struct drm_plane *plane,
> +					    struct drm_plane_state *oldstate)
> +{
> +	struct ingenic_drm *priv = drm_plane_get_priv(plane);
> +	struct drm_plane_state *state = plane->state;
> +	const struct drm_format_info *finfo;
> +	unsigned int width, height;
> +
> +	finfo = drm_format_info(state->fb->format->format);
> +	width = state->crtc->state->adjusted_mode.hdisplay;
> +	height = state->crtc->state->adjusted_mode.vdisplay;
> +
> +	priv->dma_hwdesc->addr = drm_fb_cma_get_gem_addr(state->fb, state, 0);
> +
> +	priv->dma_hwdesc->cmd = width * height * ((finfo->depth + 7) / 8) / 4;
> +	priv->dma_hwdesc->cmd |= JZ_LCD_CMD_EOF_IRQ;
> +}
> +
> +static void ingenic_drm_encoder_atomic_mode_set(struct drm_encoder *encoder,
> +						struct drm_crtc_state *crtc_state,
> +						struct drm_connector_state *conn_state)
> +{
> +	struct ingenic_drm *priv = drm_encoder_get_priv(encoder);
> +	struct drm_display_mode *mode = &crtc_state->adjusted_mode;
> +	u32 bus_flags = conn_state->connector->display_info.bus_flags;
> +	unsigned int cfg = priv->lcd_mode;
> +
> +	if (mode->flags & DRM_MODE_FLAG_NHSYNC)
> +		cfg |= JZ_LCD_CFG_HSYNC_ACTIVE_LOW;
> +	if (mode->flags & DRM_MODE_FLAG_NVSYNC)
> +		cfg |= JZ_LCD_CFG_VSYNC_ACTIVE_LOW;
> +	if (bus_flags & DRM_BUS_FLAG_DE_LOW)
> +		cfg |= JZ_LCD_CFG_DE_ACTIVE_LOW;
> +	if (bus_flags & DRM_BUS_FLAG_PIXDATA_NEGEDGE)
> +		cfg |= JZ_LCD_CFG_PCLK_FALLING_EDGE;
> +
> +	if (ingenic_drm_lcd_is_special_mode(priv->lcd_mode)) {
> +		/* TODO: Is that valid for all special modes? */
> +		cfg |= JZ_LCD_CFG_REV_POLARITY;
> +	} else {
> +		cfg |= JZ_LCD_CFG_PS_DISABLE
> +		    | JZ_LCD_CFG_CLS_DISABLE
> +		    | JZ_LCD_CFG_SPL_DISABLE
> +		    | JZ_LCD_CFG_REV_DISABLE;
> +	}
> +
> +	regmap_write(priv->map, JZ_REG_LCD_CFG, cfg);
> +}
> +
> +static irqreturn_t ingenic_drm_irq_handler(int irq, void *arg)
> +{
> +	struct ingenic_drm *priv = arg;
> +	unsigned int state;
> +
> +	regmap_read(priv->map, JZ_REG_LCD_STATE, &state);
> +
> +	regmap_update_bits(priv->map, JZ_REG_LCD_STATE,
> +			   JZ_LCD_STATE_EOF_IRQ, 0);
> +
> +	if (state & JZ_LCD_STATE_EOF_IRQ)
> +		drm_crtc_handle_vblank(&priv->crtc);
> +
> +	return IRQ_HANDLED;
> +}
> +
> +static void ingenic_drm_release(struct drm_device *drm)
> +{
> +	struct ingenic_drm *priv = drm_device_get_priv(drm);
> +
> +	drm_mode_config_cleanup(drm);
> +	drm_dev_fini(drm);
> +	kfree(priv);
> +}
> +
> +static int ingenic_drm_enable_vblank(struct drm_crtc *crtc)
> +{
> +	struct ingenic_drm *priv = drm_crtc_get_priv(crtc);
> +
> +	regmap_update_bits(priv->map, JZ_REG_LCD_CTRL,
> +			   JZ_LCD_CTRL_EOF_IRQ, JZ_LCD_CTRL_EOF_IRQ);
> +
> +	return 0;
> +}
> +
> +static void ingenic_drm_disable_vblank(struct drm_crtc *crtc)
> +{
> +	struct ingenic_drm *priv = drm_crtc_get_priv(crtc);
> +
> +	regmap_update_bits(priv->map, JZ_REG_LCD_CTRL, JZ_LCD_CTRL_EOF_IRQ, 0);
> +}
> +
> +DEFINE_DRM_GEM_CMA_FOPS(ingenic_drm_fops);
> +
> +static struct drm_driver ingenic_drm_driver_data = {
> +	.driver_features	= DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME
> +				| DRIVER_ATOMIC,
> +	.name			= "ingenic-drm",
> +	.desc			= "DRM module for Ingenic SoCs",
> +	.date			= "20190228",
> +	.major			= 1,
> +	.minor			= 0,
> +	.patchlevel		= 0,
> +
> +	.fops			= &ingenic_drm_fops,
> +
> +	.dumb_create		= drm_gem_cma_dumb_create,
> +	.gem_free_object_unlocked = drm_gem_cma_free_object,
> +	.gem_vm_ops		= &drm_gem_cma_vm_ops,
> +
> +	.prime_handle_to_fd	= drm_gem_prime_handle_to_fd,
> +	.prime_fd_to_handle	= drm_gem_prime_fd_to_handle,
> +	.gem_prime_get_sg_table	= drm_gem_cma_prime_get_sg_table,
> +	.gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
> +	.gem_prime_vmap		= drm_gem_cma_prime_vmap,
> +	.gem_prime_vunmap	= drm_gem_cma_prime_vunmap,
> +	.gem_prime_mmap		= drm_gem_cma_prime_mmap,
> +
> +	.irq_handler		= ingenic_drm_irq_handler,
> +	.release			= ingenic_drm_release,
> +};
> +
> +static const struct drm_plane_funcs ingenic_drm_primary_plane_funcs = {
> +	.update_plane		= drm_atomic_helper_update_plane,
> +	.disable_plane		= drm_atomic_helper_disable_plane,
> +	.reset			= drm_atomic_helper_plane_reset,
> +	.destroy		= drm_plane_cleanup,
> +
> +	.atomic_duplicate_state	= drm_atomic_helper_plane_duplicate_state,
> +	.atomic_destroy_state	= drm_atomic_helper_plane_destroy_state,
> +};
> +
> +static const struct drm_crtc_funcs ingenic_drm_crtc_funcs = {
> +	.set_config		= drm_atomic_helper_set_config,
> +	.page_flip		= drm_atomic_helper_page_flip,
> +	.reset			= drm_atomic_helper_crtc_reset,
> +	.destroy		= drm_crtc_cleanup,
> +
> +	.atomic_duplicate_state	= drm_atomic_helper_crtc_duplicate_state,
> +	.atomic_destroy_state	= drm_atomic_helper_crtc_destroy_state,
> +
> +	.enable_vblank		= ingenic_drm_enable_vblank,
> +	.disable_vblank		= ingenic_drm_disable_vblank,
> +
> +	.gamma_set		= drm_atomic_helper_legacy_gamma_set,
> +};
> +
> +static const struct drm_plane_helper_funcs ingenic_drm_plane_helper_funcs = {
> +	.atomic_update		= ingenic_drm_plane_atomic_update,
> +	.prepare_fb		= drm_gem_fb_prepare_fb,
> +};
> +
> +static const struct drm_crtc_helper_funcs ingenic_drm_crtc_helper_funcs = {
> +	.atomic_enable		= ingenic_drm_crtc_atomic_enable,
> +	.atomic_disable		= ingenic_drm_crtc_atomic_disable,
> +	.atomic_flush		= ingenic_drm_crtc_atomic_flush,
> +	.atomic_check		= ingenic_drm_crtc_atomic_check,
> +};
> +
> +static const struct drm_encoder_helper_funcs ingenic_drm_encoder_helper_funcs = {
> +	.atomic_mode_set	= ingenic_drm_encoder_atomic_mode_set,
> +};
> +
> +static const struct drm_mode_config_funcs ingenic_drm_mode_config_funcs = {
> +	.fb_create		= drm_gem_fb_create,
> +	.output_poll_changed	= drm_fb_helper_output_poll_changed,
> +	.atomic_check		= drm_atomic_helper_check,
> +	.atomic_commit		= drm_atomic_helper_commit,
> +};
> +
> +static const struct drm_encoder_funcs ingenic_drm_encoder_funcs = {
> +	.destroy		= drm_encoder_cleanup,
> +};
> +
> +static void ingenic_drm_free_dma_hwdesc(void *d)
> +{
> +	struct ingenic_drm *priv = d;
> +
> +	dma_free_coherent(priv->dev, sizeof(*priv->dma_hwdesc),
> +			  priv->dma_hwdesc, priv->dma_hwdesc_phys);
> +}
> +
> +static int ingenic_drm_probe(struct platform_device *pdev)
> +{
> +	const struct jz_soc_info *soc_info;
> +	struct device *dev = &pdev->dev;
> +	struct ingenic_drm *priv;
> +	struct clk *parent_clk;
> +	struct drm_bridge *bridge;
> +	struct drm_panel *panel;
> +	struct drm_device *drm;
> +	struct resource *mem;
> +	void __iomem *base;
> +	long parent_rate;
> +	int ret, irq;
> +
> +	soc_info = of_device_get_match_data(dev);
> +	if (!soc_info) {
> +		dev_err(dev, "Missing platform data\n");
> +		return -EINVAL;
> +	}
> +
> +	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
> +	if (!priv)
> +		return -ENOMEM;
> +
> +	priv->dev = dev;
> +	drm = &priv->drm;
> +	drm->dev_private = priv;
> +
> +	platform_set_drvdata(pdev, priv);
> +
> +	ret = devm_drm_dev_init(dev, drm, &ingenic_drm_driver_data);
> +	if (ret) {
> +		kfree(priv);
> +		return ret;
> +	}
> +
> +	drm_mode_config_init(drm);
> +	drm->mode_config.min_width = 0;
> +	drm->mode_config.min_height = 0;
> +	drm->mode_config.max_width = 800;
> +	drm->mode_config.max_height = 600;
> +	drm->mode_config.funcs = &ingenic_drm_mode_config_funcs;
> +
> +	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	base = devm_ioremap_resource(dev, mem);
> +	if (IS_ERR(base)) {
> +		dev_err(dev, "Failed to get memory resource");
> +		return PTR_ERR(base);
> +	}
> +
> +	priv->map = devm_regmap_init_mmio(dev, base,
> +					  &ingenic_drm_regmap_config);
> +	if (IS_ERR(priv->map)) {
> +		dev_err(dev, "Failed to create regmap");
> +		return PTR_ERR(priv->map);
> +	}
> +
> +	irq = platform_get_irq(pdev, 0);
> +	if (irq < 0) {
> +		dev_err(dev, "Failed to get platform irq");
> +		return irq;
> +	}
> +
> +	if (soc_info->needs_dev_clk) {
> +		priv->lcd_clk = devm_clk_get(dev, "lcd");
> +		if (IS_ERR(priv->lcd_clk)) {
> +			dev_err(dev, "Failed to get lcd clock");
> +			return PTR_ERR(priv->lcd_clk);
> +		}
> +	}
> +
> +	priv->pix_clk = devm_clk_get(dev, "lcd_pclk");
> +	if (IS_ERR(priv->pix_clk)) {
> +		dev_err(dev, "Failed to get pixel clock");
> +		return PTR_ERR(priv->pix_clk);
> +	}
> +
> +	ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0, &panel, &bridge);
> +	if (ret) {
> +		if (ret != -EPROBE_DEFER)
> +			dev_err(dev, "Failed to get panel handle");
> +		return ret;
> +	}
> +
> +	if (panel) {
> +		bridge = devm_drm_panel_bridge_add(dev, panel,
> +						   DRM_MODE_CONNECTOR_Unknown);
> +	}
> +
> +	if (bridge) {
> +		of_property_read_u32(bridge->of_node, "ingenic,lcd-mode",
> +				     &priv->lcd_mode);
> +	}
> +
> +	priv->dma_hwdesc = dma_alloc_coherent(dev, sizeof(*priv->dma_hwdesc),
> +					      &priv->dma_hwdesc_phys,
> +					      GFP_KERNEL);
> +	if (!priv->dma_hwdesc)
> +		return -ENOMEM;
> +
> +	ret = devm_add_action_or_reset(dev, ingenic_drm_free_dma_hwdesc, priv);
> +	if (ret)
> +		return ret;
> +
> +	priv->dma_hwdesc->next = priv->dma_hwdesc_phys;
> +	priv->dma_hwdesc->id = 0xdeafbead;
> +
> +	drm_plane_helper_add(&priv->primary, &ingenic_drm_plane_helper_funcs);
> +
> +	ret = drm_universal_plane_init(drm, &priv->primary,
> +				       0, &ingenic_drm_primary_plane_funcs,
> +				       ingenic_drm_primary_formats,
> +				       ARRAY_SIZE(ingenic_drm_primary_formats),
> +				       NULL, DRM_PLANE_TYPE_PRIMARY, NULL);
> +	if (ret) {
> +		dev_err(dev, "Failed to register primary plane: %i", ret);
> +		return ret;
> +	}
> +
> +	drm_crtc_helper_add(&priv->crtc, &ingenic_drm_crtc_helper_funcs);
> +
> +	ret = drm_crtc_init_with_planes(drm, &priv->crtc, &priv->primary,
> +					NULL, &ingenic_drm_crtc_funcs, NULL);
> +	if (ret) {
> +		dev_err(dev, "Failed to init CRTC: %i", ret);
> +		return ret;
> +	}
> +
> +	priv->encoder.possible_crtcs = 1;
> +
> +	drm_encoder_helper_add(&priv->encoder,
> +			       &ingenic_drm_encoder_helper_funcs);
> +
> +	ret = drm_encoder_init(drm, &priv->encoder, &ingenic_drm_encoder_funcs,
> +			       DRM_MODE_ENCODER_DPI, NULL);
> +	if (ret) {
> +		dev_err(dev, "Failed to init encoder: %i", ret);
> +		return ret;
> +	}
> +
> +	ret = drm_bridge_attach(&priv->encoder, bridge, NULL);
> +	if (ret) {
> +		dev_err(dev, "Unable to attach bridge");
> +		return ret;
> +	}
> +
> +	ret = drm_irq_install(drm, irq);
> +	if (ret) {
> +		dev_err(dev, "Unable to install IRQ handler");
> +		return ret;
> +	}
> +
> +	ret = drm_vblank_init(drm, 1);
> +	if (ret) {
> +		dev_err(dev, "Failed calling drm_vblank_init()");
> +		return ret;
> +	}
> +
> +	drm_mode_config_reset(drm);
> +
> +	ret = clk_prepare_enable(priv->pix_clk);
> +	if (ret) {
> +		dev_err(dev, "Unable to start pixel clock");
> +		return ret;
> +	}
> +
> +	if (priv->lcd_clk) {
> +		parent_clk = clk_get_parent(priv->lcd_clk);
> +		parent_rate = clk_get_rate(parent_clk);
> +
> +		/* LCD Device clock must be 3x the pixel clock for STN panels,
> +		 * or 1.5x the pixel clock for TFT panels. To avoid having to
> +		 * check for the LCD device clock everytime we do a mode change,
> +		 * we set the LCD device clock to the highest rate possible.
> +		 */
> +		ret = clk_set_rate(priv->lcd_clk, parent_rate);
> +		if (ret) {
> +			dev_err(dev, "Unable to set LCD clock rate");
> +			goto err_pixclk_disable;
> +		}
> +
> +		ret = clk_prepare_enable(priv->lcd_clk);
> +		if (ret) {
> +			dev_err(dev, "Unable to start lcd clock");
> +			goto err_pixclk_disable;
> +		}
> +	}
> +
> +	ret = drm_dev_register(drm, 0);
> +	if (ret) {
> +		dev_err(dev, "Failed to register DRM driver");
> +		goto err_devclk_disable;
> +	}
> +
> +	ret = drm_fbdev_generic_setup(drm, 16);
> +	if (ret)
> +		dev_warn(dev, "Unable to start fbdev emulation: %i", ret);
> +
> +	return 0;
> +
> +err_devclk_disable:
> +	if (priv->lcd_clk)
> +		clk_disable_unprepare(priv->lcd_clk);
> +err_pixclk_disable:
> +	clk_disable_unprepare(priv->pix_clk);
> +	return ret;
> +}
> +
> +static int ingenic_drm_remove(struct platform_device *pdev)
> +{
> +	struct ingenic_drm *priv = platform_get_drvdata(pdev);
> +
> +	if (priv->lcd_clk)
> +		clk_disable_unprepare(priv->lcd_clk);
> +	clk_disable_unprepare(priv->pix_clk);
> +
> +	drm_dev_unregister(&priv->drm);
> +	drm_atomic_helper_shutdown(&priv->drm);
> +
> +	return 0;
> +}
> +
> +static const struct jz_soc_info jz4740_soc_info = {
> +	.needs_dev_clk = true,
> +};
> +
> +static const struct jz_soc_info jz4725b_soc_info = {
> +	.needs_dev_clk = false,
> +};
> +
> +static const struct of_device_id ingenic_drm_of_match[] = {
> +	{ .compatible = "ingenic,jz4740-lcd", .data = &jz4740_soc_info },
> +	{ .compatible = "ingenic,jz4725b-lcd", .data = &jz4725b_soc_info },
> +	{ /* sentinel */ },
> +};
> +
> +static struct platform_driver ingenic_drm_driver = {
> +	.driver = {
> +		.name = "ingenic-drm",
> +		.of_match_table = of_match_ptr(ingenic_drm_of_match),
> +	},
> +	.probe = ingenic_drm_probe,
> +	.remove = ingenic_drm_remove,
> +};
> +module_platform_driver(ingenic_drm_driver);
> +
> +MODULE_AUTHOR("Paul Cercueil <paul@crapouillou.net>");
> +MODULE_DESCRIPTION("DRM driver for the Ingenic SoCs\n");
> +MODULE_LICENSE("GPL v2");
> -- 
> 2.11.0
> 

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch

Re: [PATCH v3 1/3] dt-bindings: Add doc for the ingenic-drm driver

[Rob Herring]

On Sun, Apr 14, 2019 at 3:08 PM Paul Cercueil <paul@crapouillou.net> wrote:
>
> Add documentation for the devicetree bindings of the DRM driver for the

DRM is a Linuxism. What is the LCD controller h/w block called?

> JZ47xx family of SoCs from Ingenic.
>
> Signed-off-by: Paul Cercueil <paul@crapouillou.net>
> Tested-by: Artur Rojek <contact@artur-rojek.eu>
> ---
>
> Notes:
>     v2: Remove ingenic,panel property.
>
>     v3: - Rename compatible strings from ingenic,jz47XX-drm to ingenic,jz47XX-lcd
>         - The ingenic,lcd-mode property is now read from the panel node instead
>           of from the driver node
>
>  .../devicetree/bindings/display/ingenic,drm.txt    | 53 ++++++++++++++++++++++
>  1 file changed, 53 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/display/ingenic,drm.txt
>
> diff --git a/Documentation/devicetree/bindings/display/ingenic,drm.txt b/Documentation/devicetree/bindings/display/ingenic,drm.txt
> new file mode 100644
> index 000000000000..9de47db8a515
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/ingenic,drm.txt
> @@ -0,0 +1,53 @@
> +Ingenic JZ47xx DRM driver
> +
> +Required properties:
> +- compatible: one of:
> +  * ingenic,jz4740-lcd
> +  * ingenic,jz4725b-lcd
> +- reg: LCD registers location and length
> +- clocks: LCD pixclock and device clock specifiers.
> +          The device clock is only required on the JZ4740.
> +- clock-names: "lcd_pclk" and "lcd"
> +- interrupts: Specifies the interrupt line the LCD controller is connected to.
> +
> +Optional properties in the panel mode:
> +- ingenic,lcd-mode: LCD mode to use with the display panel.
> +                   See <dt-bindings/display/ingenic,drm.h> for all the
> +                   possible values.
> +
> +Example:
> +
> +#include <dt-bindings/display/ingenic,drm.h>
> +
> +panel {
> +       compatible = "sharp,ls020b1dd01d", "simple-panel";

'simple-panel' is not a valid compatible string.


> +
> +       backlight = <&backlight>;
> +       power-supply = <&vcc>;
> +
> +       ingenic,lcd-mode = <JZ_LCD_SPECIAL_TFT_2>;
> +
> +       port {
> +               panel_input: endpoint {
> +                       remote-endpoint = <&panel_output>;
> +               };
> +       };
> +};
> +
> +
> +lcd: lcd-controller@13050000 {
> +       compatible = "ingenic,jz4725b-lcd";
> +       reg = <0x13050000 0x1000>;
> +
> +       interrupt-parent = <&intc>;
> +       interrupts = <31>;
> +
> +       clocks = <&cgu JZ4725B_CLK_LCD>;
> +       clock-names = "lcd";
> +
> +       port {
> +               panel_output: endpoint {
> +                       remote-endpoint = <&panel_input>;
> +               };
> +       };
> +};
> --
> 2.11.0
>