[PATCH] video: mmp: add device tree support

[PATCH] video: mmp: add device tree support

[Zhou Zhu]

add device tree support for mmp fb/controller
the description at Documentation/devicetree/bindings/fb/mmp-disp.txt

Signed-off-by: Zhou Zhu <zzhu3@marvell.com>
---
 Documentation/devicetree/bindings/fb/mmp-disp.txt |   71 ++++++++++++
 drivers/video/mmp/fb/mmpfb.c                      |   71 ++++++++----
 drivers/video/mmp/hw/mmp_ctrl.c                   |  120 ++++++++++++++++-----
 3 files changed, 217 insertions(+), 45 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/fb/mmp-disp.txt

diff --git a/Documentation/devicetree/bindings/fb/mmp-disp.txt b/Documentation/devicetree/bindings/fb/mmp-disp.txt
new file mode 100644
index 0000000..3cf2903
--- /dev/null
+++ b/Documentation/devicetree/bindings/fb/mmp-disp.txt
@@ -0,0 +1,71 @@
+* Marvell MMP Display (MMP_DISP)
+
+To config mmp display, 3 parts are required to be set in dts:
+1. mmp fb
+Required properties:
+- compatible: Should be "marvell,mmp-fb".
+- marvell,fb-name: Should be the name of this fb.
+- marvell,path-name: Should be the name of path this fb connecting to.
+- marvell,overlay-id: Should be the id of overlay this fb is on.
+- marvell,dmafetch-id: Should be the dma fetch id this fb using.
+- marvell,default-pixfmt: Should be the default pixel format when this fb is
+turned on.
+
+2. mmp controller
+Required properties:
+- compatible: Should be "marvell,mmp-disp".
+- reg: Should be address and length of the register set for this controller.
+- interrupts: Should be interrupt of this controller.
+- marvell,disp-name: Should be name of this controller
+- marvell,path-num: Should be path number exists in this controller.
+- marvell,clk-name: Should be name of clock this controller using.
+
+Required sub-node:
+- path:
+Required properties in this sub-node:
+-- marvell,path-name: Should be name of this path, fb/panel uses this name to
+connect to this path.
+-- marvell,overlay_num: Should be number of overlay this path has.
+-- marvell,output-type: Should be output-type settings
+-- marvell,path-config: Should be path-config settings
+-- marvell,link-config: Should be link-config settings
+-- marvell,rbswap: Should be rbswap settings
+
+3. panel
+Required properties:
+- marvell,path-name: Should be path name that this panel connected to.
+- other properties each panel has.
+
+Examples:
+
+fb: fb {
+	compatible = "marvell,mmp-fb";
+	marvell,fb-name = "mmp_fb";
+	marvell,path-name = "mmp_pnpath";
+	marvell,overlay-id = <0>;
+	marvell,dmafetch-id = <1>;
+	marvell,default-pixfmt = <0x108>;
+};
+
+disp: disp@d420b000 {
+	compatible = "marvell,mmp-disp";
+	reg = <0xd420b000 0x1fc>;
+	interrupts = <0 41 0x4>;
+	marvell,disp-name = "mmp_disp";
+	marvell,path-num = <1>;
+	marvell,clk-name = "LCDCIHCLK";
+	path1 {
+		marvell,path-name = "mmp_pnpath";
+		marvell,overlay-num = <2>;
+		marvell,output-type = <0>;
+		marvell,path-config = <0x20000000>;
+		marvell,link-config = <0x60000001>;
+		marvell,rbswap = <0>;
+	};
+};
+
+panel: <panel-name> {
+	...
+	marvell,path-name = "mmp_pnpath";
+	...
+};
diff --git a/drivers/video/mmp/fb/mmpfb.c b/drivers/video/mmp/fb/mmpfb.c
index 7ab31eb..e84a411 100644
--- a/drivers/video/mmp/fb/mmpfb.c
+++ b/drivers/video/mmp/fb/mmpfb.c
@@ -22,6 +22,8 @@
 #include <linux/module.h>
 #include <linux/dma-mapping.h>
 #include <linux/platform_device.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
 #include "mmpfb.h"
 
 static int var_to_pixfmt(struct fb_var_screeninfo *var)
@@ -551,56 +553,86 @@ static void fb_info_clear(struct fb_info *info)
 	fb_dealloc_cmap(&info->cmap);
 }
 
+#ifdef CONFIG_OF
+static const struct of_device_id mmp_fb_dt_match[] = {
+	{ .compatible = "marvell,mmp-fb" },
+	{},
+};
+#endif
+
 static int mmpfb_probe(struct platform_device *pdev)
 {
+#ifdef CONFIG_OF
+	struct device_node *np;
+#else
 	struct mmp_buffer_driver_mach_info *mi;
+#endif
 	struct fb_info *info = 0;
 	struct mmpfb_info *fbi = 0;
-	int ret, modes_num;
-
-	mi = pdev->dev.platform_data;
-	if (mi = NULL) {
-		dev_err(&pdev->dev, "no platform data defined\n");
-		return -EINVAL;
-	}
+	int ret = -EINVAL, modes_num;
+	int overlay_id, dmafetch_id;
+	const char *path_name;
 
 	/* initialize fb */
 	info = framebuffer_alloc(sizeof(struct mmpfb_info), &pdev->dev);
 	if (info = NULL)
 		return -ENOMEM;
 	fbi = info->par;
-	if (!fbi) {
-		ret = -EINVAL;
+	if (!fbi)
+		goto failed;
+
+#ifdef CONFIG_OF
+	np = pdev->dev.of_node;
+
+	if (!np || of_property_read_string(np,
+				"marvell,fb-name", &fbi->name) ||
+			of_property_read_string(np,
+				"marvell,path-name", &path_name) ||
+			of_property_read_u32(np,
+				"marvell,overlay-id", &overlay_id) ||
+			of_property_read_u32(np,
+				"marvell,dmafetch-id", &dmafetch_id) ||
+			of_property_read_u32(np,
+				"marvell,default-pixfmt", &fbi->pix_fmt)) {
+		dev_err(&pdev->dev, "unable to get fb setting from dt\n");
 		goto failed;
 	}
+#else
+	mi = pdev->dev.platform_data;
+	if (mi = NULL) {
+		dev_err(&pdev->dev, "no platform data defined\n");
+		goto failed;
+	}
+	fbi->name = mi->name;
+	path_name = mi->path_name;
+	overlay_id = mi->overlay_id;
+	dmafetch_id = mi->dmafetch_id;
+	fbi->pix_fmt = mi->default_pixfmt;
+#endif
 
 	/* init fb */
 	fbi->fb_info = info;
 	platform_set_drvdata(pdev, fbi);
 	fbi->dev = &pdev->dev;
-	fbi->name = mi->name;
-	fbi->pix_fmt = mi->default_pixfmt;
 	pixfmt_to_var(&info->var, fbi->pix_fmt);
 	mutex_init(&fbi->access_ok);
 
 	/* get display path by name */
-	fbi->path = mmp_get_path(mi->path_name);
+	fbi->path = mmp_get_path(path_name);
 	if (!fbi->path) {
-		dev_err(&pdev->dev, "can't get the path %s\n", mi->path_name);
-		ret = -EINVAL;
+		dev_err(&pdev->dev, "can't get the path %s\n", path_name);
 		goto failed_destroy_mutex;
 	}
 
 	dev_info(fbi->dev, "path %s get\n", fbi->path->name);
 
 	/* get overlay */
-	fbi->overlay = mmp_path_get_overlay(fbi->path, mi->overlay_id);
-	if (!fbi->overlay) {
-		ret = -EINVAL;
+	fbi->overlay = mmp_path_get_overlay(fbi->path, overlay_id);
+	if (!fbi->overlay)
 		goto failed_destroy_mutex;
-	}
+
 	/* set fetch used */
-	mmp_overlay_set_fetch(fbi->overlay, mi->dmafetch_id);
+	mmp_overlay_set_fetch(fbi->overlay, dmafetch_id);
 
 	modes_num = modes_setup(fbi);
 	if (modes_num < 0) {
@@ -679,6 +711,7 @@ static struct platform_driver mmpfb_driver = {
 	.driver		= {
 		.name	= "mmp-fb",
 		.owner	= THIS_MODULE,
+		.of_match_table = of_match_ptr(mmp_fb_dt_match),
 	},
 	.probe		= mmpfb_probe,
 };
diff --git a/drivers/video/mmp/hw/mmp_ctrl.c b/drivers/video/mmp/hw/mmp_ctrl.c
index 8621a9f..19d68bc 100644
--- a/drivers/video/mmp/hw/mmp_ctrl.c
+++ b/drivers/video/mmp/hw/mmp_ctrl.c
@@ -37,6 +37,8 @@
 #include <linux/uaccess.h>
 #include <linux/kthread.h>
 #include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
 
 #include "mmp_ctrl.h"
 
@@ -396,26 +398,57 @@ static void path_set_default(struct mmp_path *path)
 	writel_relaxed(tmp, ctrl_regs(path) + dma_ctrl(0, path->id));
 }
 
-static int path_init(struct mmphw_path_plat *path_plat,
-		struct mmp_mach_path_config *config)
+static int path_init(struct mmphw_path_plat *path_plat, void *arg)
 {
 	struct mmphw_ctrl *ctrl = path_plat->ctrl;
 	struct mmp_path_info *path_info;
 	struct mmp_path *path = NULL;
-
-	dev_info(ctrl->dev, "%s: %s\n", __func__, config->name);
+#ifdef CONFIG_OF
+	struct device_node *path_np = arg;
+#else
+	struct mmp_mach_path_config *config = arg;
+#endif
 
 	/* init driver data */
 	path_info = kzalloc(sizeof(struct mmp_path_info), GFP_KERNEL);
 	if (!path_info) {
-		dev_err(ctrl->dev, "%s: unable to alloc path_info for %s\n",
-				__func__, config->name);
-		return 0;
+		dev_err(ctrl->dev, "%s: unable to alloc path_info\n",
+				__func__);
+		return -ENOMEM;
+	}
+
+#ifdef CONFIG_OF
+	if (!path_np || of_property_read_string(path_np, "marvell,path-name",
+				&path_info->name) ||
+			of_property_read_u32(path_np, "marvell,overlay-num",
+				&path_info->output_type) ||
+			of_property_read_u32(path_np, "marvell,output-type",
+				&path_info->overlay_num)) {
+		dev_err(ctrl->dev, "%s: unable to get path setting from dt\n",
+			__func__);
+		kfree(path_info);
+		return -EINVAL;
 	}
+	/* allow these settings not set */
+	of_property_read_u32(path_np, "marvell,path-config",
+		&path_plat->path_config);
+	of_property_read_u32(path_np, "marvell,link-config",
+		&path_plat->link_config);
+	of_property_read_u32(path_np, "marvell,rbswap",
+		&path_plat->dsi_rbswap);
+#else
 	path_info->name = config->name;
+	path_info->overlay_num = config->overlay_num;
+	path_info->output_type = config->output_type;
+	path_plat->path_config = config->path_config;
+	path_plat->link_config = config->link_config;
+	path_plat->dsi_rbswap = config->dsi_rbswap;
+#endif
+
+	dev_info(ctrl->dev, "%s: %s\n", __func__, path_info->name);
+
 	path_info->id = path_plat->id;
 	path_info->dev = ctrl->dev;
-	path_info->overlay_num = config->overlay_num;
 	path_info->overlay_ops = &mmphw_overlay_ops;
 	path_info->set_mode = path_set_mode;
 	path_info->plat_data = path_plat;
@@ -424,16 +457,13 @@ static int path_init(struct mmphw_path_plat *path_plat,
 	path = mmp_register_path(path_info);
 	if (!path) {
 		kfree(path_info);
-		return 0;
+		return -EINVAL;
 	}
 	path_plat->path = path;
-	path_plat->path_config = config->path_config;
-	path_plat->link_config = config->link_config;
-	path_plat->dsi_rbswap = config->dsi_rbswap;
 	path_set_default(path);
 
 	kfree(path_info);
-	return 1;
+	return 0;
 }
 
 static void path_deinit(struct mmphw_path_plat *path_plat)
@@ -445,13 +475,25 @@ static void path_deinit(struct mmphw_path_plat *path_plat)
 		mmp_unregister_path(path_plat->path);
 }
 
+#ifdef CONFIG_OF
+static const struct of_device_id mmp_disp_dt_match[] = {
+	{ .compatible = "marvell,mmp-disp" },
+	{},
+};
+#endif
+
 static int mmphw_probe(struct platform_device *pdev)
 {
-	struct mmp_mach_plat_info *mi;
 	struct resource *res;
-	int ret, i, size, irq;
+	int ret, i, size, irq, path_num;
+	const char *clk_name, *disp_name;
 	struct mmphw_path_plat *path_plat;
 	struct mmphw_ctrl *ctrl = NULL;
+#ifdef CONFIG_OF
+	struct device_node *np, *path_np = NULL;
+#else
+	struct mmp_mach_plat_info *mi;
+#endif
 
 	/* get resources from platform data */
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
@@ -468,6 +510,22 @@ static int mmphw_probe(struct platform_device *pdev)
 		goto failed;
 	}
 
+#ifdef CONFIG_OF
+	np = pdev->dev.of_node;
+
+	if (!np || of_property_read_u32(np,
+				"marvell,path-num", &path_num) ||
+			of_property_read_string(np,
+				"marvell,disp-name", &disp_name) ||
+			of_property_read_string(np,
+				"marvell,clk-name", &clk_name) ||
+			of_get_child_count(np) != ctrl->path_num) {
+		dev_err(&pdev->dev, "%s: failed to get settings from dt\n",
+			__func__);
+		ret = -EINVAL;
+		goto failed;
+	}
+#else
 	/* get configs from platform data */
 	mi = pdev->dev.platform_data;
 	if (mi = NULL || !mi->path_num || !mi->paths) {
@@ -476,17 +534,21 @@ static int mmphw_probe(struct platform_device *pdev)
 		goto failed;
 	}
 
-	/* allocate */
+	disp_name = mi->name;
+	path_num = mi->path_num;
+	clk_name = mi->clk_name;
+#endif
+
+	/* allocate ctrl */
 	size = sizeof(struct mmphw_ctrl) + sizeof(struct mmphw_path_plat) *
-	       mi->path_num;
+	       path_num;
 	ctrl = devm_kzalloc(&pdev->dev, size, GFP_KERNEL);
 	if (!ctrl) {
 		ret = -ENOMEM;
 		goto failed;
 	}
-
-	ctrl->name = mi->name;
-	ctrl->path_num = mi->path_num;
+	ctrl->path_num = path_num;
+	ctrl->name = disp_name;
 	ctrl->dev = &pdev->dev;
 	ctrl->irq = irq;
 	platform_set_drvdata(pdev, ctrl);
@@ -521,9 +583,9 @@ static int mmphw_probe(struct platform_device *pdev)
 	}
 
 	/* get clock */
-	ctrl->clk = devm_clk_get(ctrl->dev, mi->clk_name);
+	ctrl->clk = devm_clk_get(ctrl->dev, clk_name);
 	if (IS_ERR(ctrl->clk)) {
-		dev_err(ctrl->dev, "unable to get clk %s\n", mi->clk_name);
+		dev_err(ctrl->dev, "unable to get clk %s\n", clk_name);
 		ret = -ENOENT;
 		goto failed;
 	}
@@ -539,11 +601,16 @@ static int mmphw_probe(struct platform_device *pdev)
 		path_plat->id = i;
 		path_plat->ctrl = ctrl;
 
-		/* path init */
-		if (!path_init(path_plat, &mi->paths[i])) {
-			ret = -EINVAL;
+		/* path init from mach info or dt */
+#ifdef CONFIG_OF
+		path_np = of_get_next_child(np, path_np);
+		ret = path_init(path_plat, path_np);
+#else
+		ret = path_init(path_plat, &mi->paths[i]);
+#endif
+
+		if (ret)
 			goto failed_path_init;
-		}
 	}
 
 #ifdef CONFIG_MMP_DISP_SPI
@@ -573,6 +640,7 @@ static struct platform_driver mmphw_driver = {
 	.driver		= {
 		.name	= "mmp-disp",
 		.owner	= THIS_MODULE,
+		.of_match_table = of_match_ptr(mmp_disp_dt_match),
 	},
 	.probe		= mmphw_probe,
 };
-- 
1.7.9.5

Re: [PATCH] video: mmp: add device tree support

[Zhou Zhu]

Add devicetree mail list.
On 01/09/2014 01:13 PM, Zhou Zhu wrote:
> add device tree support for mmp fb/controller
> the description at Documentation/devicetree/bindings/fb/mmp-disp.txt
>
> Signed-off-by: Zhou Zhu <zzhu3@marvell.com>
> ---
>   Documentation/devicetree/bindings/fb/mmp-disp.txt |   71 ++++++++++++
>   drivers/video/mmp/fb/mmpfb.c                      |   71 ++++++++----
>   drivers/video/mmp/hw/mmp_ctrl.c                   |  120 ++++++++++++++++-----
>   3 files changed, 217 insertions(+), 45 deletions(-)
>   create mode 100644 Documentation/devicetree/bindings/fb/mmp-disp.txt
>
> diff --git a/Documentation/devicetree/bindings/fb/mmp-disp.txt b/Documentation/devicetree/bindings/fb/mmp-disp.txt
> new file mode 100644
> index 0000000..3cf2903
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/fb/mmp-disp.txt
> @@ -0,0 +1,71 @@
> +* Marvell MMP Display (MMP_DISP)
> +
> +To config mmp display, 3 parts are required to be set in dts:
> +1. mmp fb
> +Required properties:
> +- compatible: Should be "marvell,mmp-fb".
> +- marvell,fb-name: Should be the name of this fb.
> +- marvell,path-name: Should be the name of path this fb connecting to.
> +- marvell,overlay-id: Should be the id of overlay this fb is on.
> +- marvell,dmafetch-id: Should be the dma fetch id this fb using.
> +- marvell,default-pixfmt: Should be the default pixel format when this fb is
> +turned on.
> +
> +2. mmp controller
> +Required properties:
> +- compatible: Should be "marvell,mmp-disp".
> +- reg: Should be address and length of the register set for this controller.
> +- interrupts: Should be interrupt of this controller.
> +- marvell,disp-name: Should be name of this controller
> +- marvell,path-num: Should be path number exists in this controller.
> +- marvell,clk-name: Should be name of clock this controller using.
> +
> +Required sub-node:
> +- path:
> +Required properties in this sub-node:
> +-- marvell,path-name: Should be name of this path, fb/panel uses this name to
> +connect to this path.
> +-- marvell,overlay_num: Should be number of overlay this path has.
> +-- marvell,output-type: Should be output-type settings
> +-- marvell,path-config: Should be path-config settings
> +-- marvell,link-config: Should be link-config settings
> +-- marvell,rbswap: Should be rbswap settings
> +
> +3. panel
> +Required properties:
> +- marvell,path-name: Should be path name that this panel connected to.
> +- other properties each panel has.
> +
> +Examples:
> +
> +fb: fb {
> +	compatible = "marvell,mmp-fb";
> +	marvell,fb-name = "mmp_fb";
> +	marvell,path-name = "mmp_pnpath";
> +	marvell,overlay-id = <0>;
> +	marvell,dmafetch-id = <1>;
> +	marvell,default-pixfmt = <0x108>;
> +};
> +
> +disp: disp@d420b000 {
> +	compatible = "marvell,mmp-disp";
> +	reg = <0xd420b000 0x1fc>;
> +	interrupts = <0 41 0x4>;
> +	marvell,disp-name = "mmp_disp";
> +	marvell,path-num = <1>;
> +	marvell,clk-name = "LCDCIHCLK";
> +	path1 {
> +		marvell,path-name = "mmp_pnpath";
> +		marvell,overlay-num = <2>;
> +		marvell,output-type = <0>;
> +		marvell,path-config = <0x20000000>;
> +		marvell,link-config = <0x60000001>;
> +		marvell,rbswap = <0>;
> +	};
> +};
> +
> +panel: <panel-name> {
> +	...
> +	marvell,path-name = "mmp_pnpath";
> +	...
> +};
> diff --git a/drivers/video/mmp/fb/mmpfb.c b/drivers/video/mmp/fb/mmpfb.c
> index 7ab31eb..e84a411 100644
> --- a/drivers/video/mmp/fb/mmpfb.c
> +++ b/drivers/video/mmp/fb/mmpfb.c
> @@ -22,6 +22,8 @@
>   #include <linux/module.h>
>   #include <linux/dma-mapping.h>
>   #include <linux/platform_device.h>
> +#include <linux/of.h>
> +#include <linux/of_device.h>
>   #include "mmpfb.h"
>
>   static int var_to_pixfmt(struct fb_var_screeninfo *var)
> @@ -551,56 +553,86 @@ static void fb_info_clear(struct fb_info *info)
>   	fb_dealloc_cmap(&info->cmap);
>   }
>
> +#ifdef CONFIG_OF
> +static const struct of_device_id mmp_fb_dt_match[] = {
> +	{ .compatible = "marvell,mmp-fb" },
> +	{},
> +};
> +#endif
> +
>   static int mmpfb_probe(struct platform_device *pdev)
>   {
> +#ifdef CONFIG_OF
> +	struct device_node *np;
> +#else
>   	struct mmp_buffer_driver_mach_info *mi;
> +#endif
>   	struct fb_info *info = 0;
>   	struct mmpfb_info *fbi = 0;
> -	int ret, modes_num;
> -
> -	mi = pdev->dev.platform_data;
> -	if (mi = NULL) {
> -		dev_err(&pdev->dev, "no platform data defined\n");
> -		return -EINVAL;
> -	}
> +	int ret = -EINVAL, modes_num;
> +	int overlay_id, dmafetch_id;
> +	const char *path_name;
>
>   	/* initialize fb */
>   	info = framebuffer_alloc(sizeof(struct mmpfb_info), &pdev->dev);
>   	if (info = NULL)
>   		return -ENOMEM;
>   	fbi = info->par;
> -	if (!fbi) {
> -		ret = -EINVAL;
> +	if (!fbi)
> +		goto failed;
> +
> +#ifdef CONFIG_OF
> +	np = pdev->dev.of_node;
> +
> +	if (!np || of_property_read_string(np,
> +				"marvell,fb-name", &fbi->name) ||
> +			of_property_read_string(np,
> +				"marvell,path-name", &path_name) ||
> +			of_property_read_u32(np,
> +				"marvell,overlay-id", &overlay_id) ||
> +			of_property_read_u32(np,
> +				"marvell,dmafetch-id", &dmafetch_id) ||
> +			of_property_read_u32(np,
> +				"marvell,default-pixfmt", &fbi->pix_fmt)) {
> +		dev_err(&pdev->dev, "unable to get fb setting from dt\n");
>   		goto failed;
>   	}
> +#else
> +	mi = pdev->dev.platform_data;
> +	if (mi = NULL) {
> +		dev_err(&pdev->dev, "no platform data defined\n");
> +		goto failed;
> +	}
> +	fbi->name = mi->name;
> +	path_name = mi->path_name;
> +	overlay_id = mi->overlay_id;
> +	dmafetch_id = mi->dmafetch_id;
> +	fbi->pix_fmt = mi->default_pixfmt;
> +#endif
>
>   	/* init fb */
>   	fbi->fb_info = info;
>   	platform_set_drvdata(pdev, fbi);
>   	fbi->dev = &pdev->dev;
> -	fbi->name = mi->name;
> -	fbi->pix_fmt = mi->default_pixfmt;
>   	pixfmt_to_var(&info->var, fbi->pix_fmt);
>   	mutex_init(&fbi->access_ok);
>
>   	/* get display path by name */
> -	fbi->path = mmp_get_path(mi->path_name);
> +	fbi->path = mmp_get_path(path_name);
>   	if (!fbi->path) {
> -		dev_err(&pdev->dev, "can't get the path %s\n", mi->path_name);
> -		ret = -EINVAL;
> +		dev_err(&pdev->dev, "can't get the path %s\n", path_name);
>   		goto failed_destroy_mutex;
>   	}
>
>   	dev_info(fbi->dev, "path %s get\n", fbi->path->name);
>
>   	/* get overlay */
> -	fbi->overlay = mmp_path_get_overlay(fbi->path, mi->overlay_id);
> -	if (!fbi->overlay) {
> -		ret = -EINVAL;
> +	fbi->overlay = mmp_path_get_overlay(fbi->path, overlay_id);
> +	if (!fbi->overlay)
>   		goto failed_destroy_mutex;
> -	}
> +
>   	/* set fetch used */
> -	mmp_overlay_set_fetch(fbi->overlay, mi->dmafetch_id);
> +	mmp_overlay_set_fetch(fbi->overlay, dmafetch_id);
>
>   	modes_num = modes_setup(fbi);
>   	if (modes_num < 0) {
> @@ -679,6 +711,7 @@ static struct platform_driver mmpfb_driver = {
>   	.driver		= {
>   		.name	= "mmp-fb",
>   		.owner	= THIS_MODULE,
> +		.of_match_table = of_match_ptr(mmp_fb_dt_match),
>   	},
>   	.probe		= mmpfb_probe,
>   };
> diff --git a/drivers/video/mmp/hw/mmp_ctrl.c b/drivers/video/mmp/hw/mmp_ctrl.c
> index 8621a9f..19d68bc 100644
> --- a/drivers/video/mmp/hw/mmp_ctrl.c
> +++ b/drivers/video/mmp/hw/mmp_ctrl.c
> @@ -37,6 +37,8 @@
>   #include <linux/uaccess.h>
>   #include <linux/kthread.h>
>   #include <linux/io.h>
> +#include <linux/of.h>
> +#include <linux/of_device.h>
>
>   #include "mmp_ctrl.h"
>
> @@ -396,26 +398,57 @@ static void path_set_default(struct mmp_path *path)
>   	writel_relaxed(tmp, ctrl_regs(path) + dma_ctrl(0, path->id));
>   }
>
> -static int path_init(struct mmphw_path_plat *path_plat,
> -		struct mmp_mach_path_config *config)
> +static int path_init(struct mmphw_path_plat *path_plat, void *arg)
>   {
>   	struct mmphw_ctrl *ctrl = path_plat->ctrl;
>   	struct mmp_path_info *path_info;
>   	struct mmp_path *path = NULL;
> -
> -	dev_info(ctrl->dev, "%s: %s\n", __func__, config->name);
> +#ifdef CONFIG_OF
> +	struct device_node *path_np = arg;
> +#else
> +	struct mmp_mach_path_config *config = arg;
> +#endif
>
>   	/* init driver data */
>   	path_info = kzalloc(sizeof(struct mmp_path_info), GFP_KERNEL);
>   	if (!path_info) {
> -		dev_err(ctrl->dev, "%s: unable to alloc path_info for %s\n",
> -				__func__, config->name);
> -		return 0;
> +		dev_err(ctrl->dev, "%s: unable to alloc path_info\n",
> +				__func__);
> +		return -ENOMEM;
> +	}
> +
> +#ifdef CONFIG_OF
> +	if (!path_np || of_property_read_string(path_np, "marvell,path-name",
> +				&path_info->name) ||
> +			of_property_read_u32(path_np, "marvell,overlay-num",
> +				&path_info->output_type) ||
> +			of_property_read_u32(path_np, "marvell,output-type",
> +				&path_info->overlay_num)) {
> +		dev_err(ctrl->dev, "%s: unable to get path setting from dt\n",
> +			__func__);
> +		kfree(path_info);
> +		return -EINVAL;
>   	}
> +	/* allow these settings not set */
> +	of_property_read_u32(path_np, "marvell,path-config",
> +		&path_plat->path_config);
> +	of_property_read_u32(path_np, "marvell,link-config",
> +		&path_plat->link_config);
> +	of_property_read_u32(path_np, "marvell,rbswap",
> +		&path_plat->dsi_rbswap);
> +#else
>   	path_info->name = config->name;
> +	path_info->overlay_num = config->overlay_num;
> +	path_info->output_type = config->output_type;
> +	path_plat->path_config = config->path_config;
> +	path_plat->link_config = config->link_config;
> +	path_plat->dsi_rbswap = config->dsi_rbswap;
> +#endif
> +
> +	dev_info(ctrl->dev, "%s: %s\n", __func__, path_info->name);
> +
>   	path_info->id = path_plat->id;
>   	path_info->dev = ctrl->dev;
> -	path_info->overlay_num = config->overlay_num;
>   	path_info->overlay_ops = &mmphw_overlay_ops;
>   	path_info->set_mode = path_set_mode;
>   	path_info->plat_data = path_plat;
> @@ -424,16 +457,13 @@ static int path_init(struct mmphw_path_plat *path_plat,
>   	path = mmp_register_path(path_info);
>   	if (!path) {
>   		kfree(path_info);
> -		return 0;
> +		return -EINVAL;
>   	}
>   	path_plat->path = path;
> -	path_plat->path_config = config->path_config;
> -	path_plat->link_config = config->link_config;
> -	path_plat->dsi_rbswap = config->dsi_rbswap;
>   	path_set_default(path);
>
>   	kfree(path_info);
> -	return 1;
> +	return 0;
>   }
>
>   static void path_deinit(struct mmphw_path_plat *path_plat)
> @@ -445,13 +475,25 @@ static void path_deinit(struct mmphw_path_plat *path_plat)
>   		mmp_unregister_path(path_plat->path);
>   }
>
> +#ifdef CONFIG_OF
> +static const struct of_device_id mmp_disp_dt_match[] = {
> +	{ .compatible = "marvell,mmp-disp" },
> +	{},
> +};
> +#endif
> +
>   static int mmphw_probe(struct platform_device *pdev)
>   {
> -	struct mmp_mach_plat_info *mi;
>   	struct resource *res;
> -	int ret, i, size, irq;
> +	int ret, i, size, irq, path_num;
> +	const char *clk_name, *disp_name;
>   	struct mmphw_path_plat *path_plat;
>   	struct mmphw_ctrl *ctrl = NULL;
> +#ifdef CONFIG_OF
> +	struct device_node *np, *path_np = NULL;
> +#else
> +	struct mmp_mach_plat_info *mi;
> +#endif
>
>   	/* get resources from platform data */
>   	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> @@ -468,6 +510,22 @@ static int mmphw_probe(struct platform_device *pdev)
>   		goto failed;
>   	}
>
> +#ifdef CONFIG_OF
> +	np = pdev->dev.of_node;
> +
> +	if (!np || of_property_read_u32(np,
> +				"marvell,path-num", &path_num) ||
> +			of_property_read_string(np,
> +				"marvell,disp-name", &disp_name) ||
> +			of_property_read_string(np,
> +				"marvell,clk-name", &clk_name) ||
> +			of_get_child_count(np) != ctrl->path_num) {
> +		dev_err(&pdev->dev, "%s: failed to get settings from dt\n",
> +			__func__);
> +		ret = -EINVAL;
> +		goto failed;
> +	}
> +#else
>   	/* get configs from platform data */
>   	mi = pdev->dev.platform_data;
>   	if (mi = NULL || !mi->path_num || !mi->paths) {
> @@ -476,17 +534,21 @@ static int mmphw_probe(struct platform_device *pdev)
>   		goto failed;
>   	}
>
> -	/* allocate */
> +	disp_name = mi->name;
> +	path_num = mi->path_num;
> +	clk_name = mi->clk_name;
> +#endif
> +
> +	/* allocate ctrl */
>   	size = sizeof(struct mmphw_ctrl) + sizeof(struct mmphw_path_plat) *
> -	       mi->path_num;
> +	       path_num;
>   	ctrl = devm_kzalloc(&pdev->dev, size, GFP_KERNEL);
>   	if (!ctrl) {
>   		ret = -ENOMEM;
>   		goto failed;
>   	}
> -
> -	ctrl->name = mi->name;
> -	ctrl->path_num = mi->path_num;
> +	ctrl->path_num = path_num;
> +	ctrl->name = disp_name;
>   	ctrl->dev = &pdev->dev;
>   	ctrl->irq = irq;
>   	platform_set_drvdata(pdev, ctrl);
> @@ -521,9 +583,9 @@ static int mmphw_probe(struct platform_device *pdev)
>   	}
>
>   	/* get clock */
> -	ctrl->clk = devm_clk_get(ctrl->dev, mi->clk_name);
> +	ctrl->clk = devm_clk_get(ctrl->dev, clk_name);
>   	if (IS_ERR(ctrl->clk)) {
> -		dev_err(ctrl->dev, "unable to get clk %s\n", mi->clk_name);
> +		dev_err(ctrl->dev, "unable to get clk %s\n", clk_name);
>   		ret = -ENOENT;
>   		goto failed;
>   	}
> @@ -539,11 +601,16 @@ static int mmphw_probe(struct platform_device *pdev)
>   		path_plat->id = i;
>   		path_plat->ctrl = ctrl;
>
> -		/* path init */
> -		if (!path_init(path_plat, &mi->paths[i])) {
> -			ret = -EINVAL;
> +		/* path init from mach info or dt */
> +#ifdef CONFIG_OF
> +		path_np = of_get_next_child(np, path_np);
> +		ret = path_init(path_plat, path_np);
> +#else
> +		ret = path_init(path_plat, &mi->paths[i]);
> +#endif
> +
> +		if (ret)
>   			goto failed_path_init;
> -		}
>   	}
>
>   #ifdef CONFIG_MMP_DISP_SPI
> @@ -573,6 +640,7 @@ static struct platform_driver mmphw_driver = {
>   	.driver		= {
>   		.name	= "mmp-disp",
>   		.owner	= THIS_MODULE,
> +		.of_match_table = of_match_ptr(mmp_disp_dt_match),
>   	},
>   	.probe		= mmphw_probe,
>   };
>

-- 
Thanks, -Zhou

Re: [PATCH] video: mmp: add device tree support

[Zhou Zhu]

Add devicetree mail list.
On 01/09/2014 01:13 PM, Zhou Zhu wrote:
> add device tree support for mmp fb/controller
> the description at Documentation/devicetree/bindings/fb/mmp-disp.txt
>
> Signed-off-by: Zhou Zhu <zzhu3-eYqpPyKDWXRBDgjK7y7TUQ@public.gmane.org>
> ---
>   Documentation/devicetree/bindings/fb/mmp-disp.txt |   71 ++++++++++++
>   drivers/video/mmp/fb/mmpfb.c                      |   71 ++++++++----
>   drivers/video/mmp/hw/mmp_ctrl.c                   |  120 ++++++++++++++++-----
>   3 files changed, 217 insertions(+), 45 deletions(-)
>   create mode 100644 Documentation/devicetree/bindings/fb/mmp-disp.txt
>
> diff --git a/Documentation/devicetree/bindings/fb/mmp-disp.txt b/Documentation/devicetree/bindings/fb/mmp-disp.txt
> new file mode 100644
> index 0000000..3cf2903
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/fb/mmp-disp.txt
> @@ -0,0 +1,71 @@
> +* Marvell MMP Display (MMP_DISP)
> +
> +To config mmp display, 3 parts are required to be set in dts:
> +1. mmp fb
> +Required properties:
> +- compatible: Should be "marvell,mmp-fb".
> +- marvell,fb-name: Should be the name of this fb.
> +- marvell,path-name: Should be the name of path this fb connecting to.
> +- marvell,overlay-id: Should be the id of overlay this fb is on.
> +- marvell,dmafetch-id: Should be the dma fetch id this fb using.
> +- marvell,default-pixfmt: Should be the default pixel format when this fb is
> +turned on.
> +
> +2. mmp controller
> +Required properties:
> +- compatible: Should be "marvell,mmp-disp".
> +- reg: Should be address and length of the register set for this controller.
> +- interrupts: Should be interrupt of this controller.
> +- marvell,disp-name: Should be name of this controller
> +- marvell,path-num: Should be path number exists in this controller.
> +- marvell,clk-name: Should be name of clock this controller using.
> +
> +Required sub-node:
> +- path:
> +Required properties in this sub-node:
> +-- marvell,path-name: Should be name of this path, fb/panel uses this name to
> +connect to this path.
> +-- marvell,overlay_num: Should be number of overlay this path has.
> +-- marvell,output-type: Should be output-type settings
> +-- marvell,path-config: Should be path-config settings
> +-- marvell,link-config: Should be link-config settings
> +-- marvell,rbswap: Should be rbswap settings
> +
> +3. panel
> +Required properties:
> +- marvell,path-name: Should be path name that this panel connected to.
> +- other properties each panel has.
> +
> +Examples:
> +
> +fb: fb {
> +	compatible = "marvell,mmp-fb";
> +	marvell,fb-name = "mmp_fb";
> +	marvell,path-name = "mmp_pnpath";
> +	marvell,overlay-id = <0>;
> +	marvell,dmafetch-id = <1>;
> +	marvell,default-pixfmt = <0x108>;
> +};
> +
> +disp: disp@d420b000 {
> +	compatible = "marvell,mmp-disp";
> +	reg = <0xd420b000 0x1fc>;
> +	interrupts = <0 41 0x4>;
> +	marvell,disp-name = "mmp_disp";
> +	marvell,path-num = <1>;
> +	marvell,clk-name = "LCDCIHCLK";
> +	path1 {
> +		marvell,path-name = "mmp_pnpath";
> +		marvell,overlay-num = <2>;
> +		marvell,output-type = <0>;
> +		marvell,path-config = <0x20000000>;
> +		marvell,link-config = <0x60000001>;
> +		marvell,rbswap = <0>;
> +	};
> +};
> +
> +panel: <panel-name> {
> +	...
> +	marvell,path-name = "mmp_pnpath";
> +	...
> +};
> diff --git a/drivers/video/mmp/fb/mmpfb.c b/drivers/video/mmp/fb/mmpfb.c
> index 7ab31eb..e84a411 100644
> --- a/drivers/video/mmp/fb/mmpfb.c
> +++ b/drivers/video/mmp/fb/mmpfb.c
> @@ -22,6 +22,8 @@
>   #include <linux/module.h>
>   #include <linux/dma-mapping.h>
>   #include <linux/platform_device.h>
> +#include <linux/of.h>
> +#include <linux/of_device.h>
>   #include "mmpfb.h"
>
>   static int var_to_pixfmt(struct fb_var_screeninfo *var)
> @@ -551,56 +553,86 @@ static void fb_info_clear(struct fb_info *info)
>   	fb_dealloc_cmap(&info->cmap);
>   }
>
> +#ifdef CONFIG_OF
> +static const struct of_device_id mmp_fb_dt_match[] = {
> +	{ .compatible = "marvell,mmp-fb" },
> +	{},
> +};
> +#endif
> +
>   static int mmpfb_probe(struct platform_device *pdev)
>   {
> +#ifdef CONFIG_OF
> +	struct device_node *np;
> +#else
>   	struct mmp_buffer_driver_mach_info *mi;
> +#endif
>   	struct fb_info *info = 0;
>   	struct mmpfb_info *fbi = 0;
> -	int ret, modes_num;
> -
> -	mi = pdev->dev.platform_data;
> -	if (mi == NULL) {
> -		dev_err(&pdev->dev, "no platform data defined\n");
> -		return -EINVAL;
> -	}
> +	int ret = -EINVAL, modes_num;
> +	int overlay_id, dmafetch_id;
> +	const char *path_name;
>
>   	/* initialize fb */
>   	info = framebuffer_alloc(sizeof(struct mmpfb_info), &pdev->dev);
>   	if (info == NULL)
>   		return -ENOMEM;
>   	fbi = info->par;
> -	if (!fbi) {
> -		ret = -EINVAL;
> +	if (!fbi)
> +		goto failed;
> +
> +#ifdef CONFIG_OF
> +	np = pdev->dev.of_node;
> +
> +	if (!np || of_property_read_string(np,
> +				"marvell,fb-name", &fbi->name) ||
> +			of_property_read_string(np,
> +				"marvell,path-name", &path_name) ||
> +			of_property_read_u32(np,
> +				"marvell,overlay-id", &overlay_id) ||
> +			of_property_read_u32(np,
> +				"marvell,dmafetch-id", &dmafetch_id) ||
> +			of_property_read_u32(np,
> +				"marvell,default-pixfmt", &fbi->pix_fmt)) {
> +		dev_err(&pdev->dev, "unable to get fb setting from dt\n");
>   		goto failed;
>   	}
> +#else
> +	mi = pdev->dev.platform_data;
> +	if (mi == NULL) {
> +		dev_err(&pdev->dev, "no platform data defined\n");
> +		goto failed;
> +	}
> +	fbi->name = mi->name;
> +	path_name = mi->path_name;
> +	overlay_id = mi->overlay_id;
> +	dmafetch_id = mi->dmafetch_id;
> +	fbi->pix_fmt = mi->default_pixfmt;
> +#endif
>
>   	/* init fb */
>   	fbi->fb_info = info;
>   	platform_set_drvdata(pdev, fbi);
>   	fbi->dev = &pdev->dev;
> -	fbi->name = mi->name;
> -	fbi->pix_fmt = mi->default_pixfmt;
>   	pixfmt_to_var(&info->var, fbi->pix_fmt);
>   	mutex_init(&fbi->access_ok);
>
>   	/* get display path by name */
> -	fbi->path = mmp_get_path(mi->path_name);
> +	fbi->path = mmp_get_path(path_name);
>   	if (!fbi->path) {
> -		dev_err(&pdev->dev, "can't get the path %s\n", mi->path_name);
> -		ret = -EINVAL;
> +		dev_err(&pdev->dev, "can't get the path %s\n", path_name);
>   		goto failed_destroy_mutex;
>   	}
>
>   	dev_info(fbi->dev, "path %s get\n", fbi->path->name);
>
>   	/* get overlay */
> -	fbi->overlay = mmp_path_get_overlay(fbi->path, mi->overlay_id);
> -	if (!fbi->overlay) {
> -		ret = -EINVAL;
> +	fbi->overlay = mmp_path_get_overlay(fbi->path, overlay_id);
> +	if (!fbi->overlay)
>   		goto failed_destroy_mutex;
> -	}
> +
>   	/* set fetch used */
> -	mmp_overlay_set_fetch(fbi->overlay, mi->dmafetch_id);
> +	mmp_overlay_set_fetch(fbi->overlay, dmafetch_id);
>
>   	modes_num = modes_setup(fbi);
>   	if (modes_num < 0) {
> @@ -679,6 +711,7 @@ static struct platform_driver mmpfb_driver = {
>   	.driver		= {
>   		.name	= "mmp-fb",
>   		.owner	= THIS_MODULE,
> +		.of_match_table = of_match_ptr(mmp_fb_dt_match),
>   	},
>   	.probe		= mmpfb_probe,
>   };
> diff --git a/drivers/video/mmp/hw/mmp_ctrl.c b/drivers/video/mmp/hw/mmp_ctrl.c
> index 8621a9f..19d68bc 100644
> --- a/drivers/video/mmp/hw/mmp_ctrl.c
> +++ b/drivers/video/mmp/hw/mmp_ctrl.c
> @@ -37,6 +37,8 @@
>   #include <linux/uaccess.h>
>   #include <linux/kthread.h>
>   #include <linux/io.h>
> +#include <linux/of.h>
> +#include <linux/of_device.h>
>
>   #include "mmp_ctrl.h"
>
> @@ -396,26 +398,57 @@ static void path_set_default(struct mmp_path *path)
>   	writel_relaxed(tmp, ctrl_regs(path) + dma_ctrl(0, path->id));
>   }
>
> -static int path_init(struct mmphw_path_plat *path_plat,
> -		struct mmp_mach_path_config *config)
> +static int path_init(struct mmphw_path_plat *path_plat, void *arg)
>   {
>   	struct mmphw_ctrl *ctrl = path_plat->ctrl;
>   	struct mmp_path_info *path_info;
>   	struct mmp_path *path = NULL;
> -
> -	dev_info(ctrl->dev, "%s: %s\n", __func__, config->name);
> +#ifdef CONFIG_OF
> +	struct device_node *path_np = arg;
> +#else
> +	struct mmp_mach_path_config *config = arg;
> +#endif
>
>   	/* init driver data */
>   	path_info = kzalloc(sizeof(struct mmp_path_info), GFP_KERNEL);
>   	if (!path_info) {
> -		dev_err(ctrl->dev, "%s: unable to alloc path_info for %s\n",
> -				__func__, config->name);
> -		return 0;
> +		dev_err(ctrl->dev, "%s: unable to alloc path_info\n",
> +				__func__);
> +		return -ENOMEM;
> +	}
> +
> +#ifdef CONFIG_OF
> +	if (!path_np || of_property_read_string(path_np, "marvell,path-name",
> +				&path_info->name) ||
> +			of_property_read_u32(path_np, "marvell,overlay-num",
> +				&path_info->output_type) ||
> +			of_property_read_u32(path_np, "marvell,output-type",
> +				&path_info->overlay_num)) {
> +		dev_err(ctrl->dev, "%s: unable to get path setting from dt\n",
> +			__func__);
> +		kfree(path_info);
> +		return -EINVAL;
>   	}
> +	/* allow these settings not set */
> +	of_property_read_u32(path_np, "marvell,path-config",
> +		&path_plat->path_config);
> +	of_property_read_u32(path_np, "marvell,link-config",
> +		&path_plat->link_config);
> +	of_property_read_u32(path_np, "marvell,rbswap",
> +		&path_plat->dsi_rbswap);
> +#else
>   	path_info->name = config->name;
> +	path_info->overlay_num = config->overlay_num;
> +	path_info->output_type = config->output_type;
> +	path_plat->path_config = config->path_config;
> +	path_plat->link_config = config->link_config;
> +	path_plat->dsi_rbswap = config->dsi_rbswap;
> +#endif
> +
> +	dev_info(ctrl->dev, "%s: %s\n", __func__, path_info->name);
> +
>   	path_info->id = path_plat->id;
>   	path_info->dev = ctrl->dev;
> -	path_info->overlay_num = config->overlay_num;
>   	path_info->overlay_ops = &mmphw_overlay_ops;
>   	path_info->set_mode = path_set_mode;
>   	path_info->plat_data = path_plat;
> @@ -424,16 +457,13 @@ static int path_init(struct mmphw_path_plat *path_plat,
>   	path = mmp_register_path(path_info);
>   	if (!path) {
>   		kfree(path_info);
> -		return 0;
> +		return -EINVAL;
>   	}
>   	path_plat->path = path;
> -	path_plat->path_config = config->path_config;
> -	path_plat->link_config = config->link_config;
> -	path_plat->dsi_rbswap = config->dsi_rbswap;
>   	path_set_default(path);
>
>   	kfree(path_info);
> -	return 1;
> +	return 0;
>   }
>
>   static void path_deinit(struct mmphw_path_plat *path_plat)
> @@ -445,13 +475,25 @@ static void path_deinit(struct mmphw_path_plat *path_plat)
>   		mmp_unregister_path(path_plat->path);
>   }
>
> +#ifdef CONFIG_OF
> +static const struct of_device_id mmp_disp_dt_match[] = {
> +	{ .compatible = "marvell,mmp-disp" },
> +	{},
> +};
> +#endif
> +
>   static int mmphw_probe(struct platform_device *pdev)
>   {
> -	struct mmp_mach_plat_info *mi;
>   	struct resource *res;
> -	int ret, i, size, irq;
> +	int ret, i, size, irq, path_num;
> +	const char *clk_name, *disp_name;
>   	struct mmphw_path_plat *path_plat;
>   	struct mmphw_ctrl *ctrl = NULL;
> +#ifdef CONFIG_OF
> +	struct device_node *np, *path_np = NULL;
> +#else
> +	struct mmp_mach_plat_info *mi;
> +#endif
>
>   	/* get resources from platform data */
>   	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> @@ -468,6 +510,22 @@ static int mmphw_probe(struct platform_device *pdev)
>   		goto failed;
>   	}
>
> +#ifdef CONFIG_OF
> +	np = pdev->dev.of_node;
> +
> +	if (!np || of_property_read_u32(np,
> +				"marvell,path-num", &path_num) ||
> +			of_property_read_string(np,
> +				"marvell,disp-name", &disp_name) ||
> +			of_property_read_string(np,
> +				"marvell,clk-name", &clk_name) ||
> +			of_get_child_count(np) != ctrl->path_num) {
> +		dev_err(&pdev->dev, "%s: failed to get settings from dt\n",
> +			__func__);
> +		ret = -EINVAL;
> +		goto failed;
> +	}
> +#else
>   	/* get configs from platform data */
>   	mi = pdev->dev.platform_data;
>   	if (mi == NULL || !mi->path_num || !mi->paths) {
> @@ -476,17 +534,21 @@ static int mmphw_probe(struct platform_device *pdev)
>   		goto failed;
>   	}
>
> -	/* allocate */
> +	disp_name = mi->name;
> +	path_num = mi->path_num;
> +	clk_name = mi->clk_name;
> +#endif
> +
> +	/* allocate ctrl */
>   	size = sizeof(struct mmphw_ctrl) + sizeof(struct mmphw_path_plat) *
> -	       mi->path_num;
> +	       path_num;
>   	ctrl = devm_kzalloc(&pdev->dev, size, GFP_KERNEL);
>   	if (!ctrl) {
>   		ret = -ENOMEM;
>   		goto failed;
>   	}
> -
> -	ctrl->name = mi->name;
> -	ctrl->path_num = mi->path_num;
> +	ctrl->path_num = path_num;
> +	ctrl->name = disp_name;
>   	ctrl->dev = &pdev->dev;
>   	ctrl->irq = irq;
>   	platform_set_drvdata(pdev, ctrl);
> @@ -521,9 +583,9 @@ static int mmphw_probe(struct platform_device *pdev)
>   	}
>
>   	/* get clock */
> -	ctrl->clk = devm_clk_get(ctrl->dev, mi->clk_name);
> +	ctrl->clk = devm_clk_get(ctrl->dev, clk_name);
>   	if (IS_ERR(ctrl->clk)) {
> -		dev_err(ctrl->dev, "unable to get clk %s\n", mi->clk_name);
> +		dev_err(ctrl->dev, "unable to get clk %s\n", clk_name);
>   		ret = -ENOENT;
>   		goto failed;
>   	}
> @@ -539,11 +601,16 @@ static int mmphw_probe(struct platform_device *pdev)
>   		path_plat->id = i;
>   		path_plat->ctrl = ctrl;
>
> -		/* path init */
> -		if (!path_init(path_plat, &mi->paths[i])) {
> -			ret = -EINVAL;
> +		/* path init from mach info or dt */
> +#ifdef CONFIG_OF
> +		path_np = of_get_next_child(np, path_np);
> +		ret = path_init(path_plat, path_np);
> +#else
> +		ret = path_init(path_plat, &mi->paths[i]);
> +#endif
> +
> +		if (ret)
>   			goto failed_path_init;
> -		}
>   	}
>
>   #ifdef CONFIG_MMP_DISP_SPI
> @@ -573,6 +640,7 @@ static struct platform_driver mmphw_driver = {
>   	.driver		= {
>   		.name	= "mmp-disp",
>   		.owner	= THIS_MODULE,
> +		.of_match_table = of_match_ptr(mmp_disp_dt_match),
>   	},
>   	.probe		= mmphw_probe,
>   };
>

-- 
Thanks, -Zhou
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Re: [PATCH] video: mmp: add device tree support

[Sascha Hauer]

On Thu, Jan 09, 2014 at 01:13:14PM +0800, Zhou Zhu wrote:
> add device tree support for mmp fb/controller
> the description at Documentation/devicetree/bindings/fb/mmp-disp.txt
> 
> Signed-off-by: Zhou Zhu <zzhu3@marvell.com>
> ---
>  Documentation/devicetree/bindings/fb/mmp-disp.txt |   71 ++++++++++++
>  drivers/video/mmp/fb/mmpfb.c                      |   71 ++++++++----
>  drivers/video/mmp/hw/mmp_ctrl.c                   |  120 ++++++++++++++++-----
>  3 files changed, 217 insertions(+), 45 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/fb/mmp-disp.txt
> 
> diff --git a/Documentation/devicetree/bindings/fb/mmp-disp.txt b/Documentation/devicetree/bindings/fb/mmp-disp.txt
> new file mode 100644
> index 0000000..3cf2903
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/fb/mmp-disp.txt
> @@ -0,0 +1,71 @@
> +* Marvell MMP Display (MMP_DISP)
> +
> +To config mmp display, 3 parts are required to be set in dts:
> +1. mmp fb
> +Required properties:
> +- compatible: Should be "marvell,mmp-fb".
> +- marvell,fb-name: Should be the name of this fb.
> +- marvell,path-name: Should be the name of path this fb connecting to.
> +- marvell,overlay-id: Should be the id of overlay this fb is on.
> +- marvell,dmafetch-id: Should be the dma fetch id this fb using.
> +- marvell,default-pixfmt: Should be the default pixel format when this fb is
> +turned on.
> +
> +2. mmp controller
> +Required properties:
> +- compatible: Should be "marvell,mmp-disp".
> +- reg: Should be address and length of the register set for this controller.
> +- interrupts: Should be interrupt of this controller.
> +- marvell,disp-name: Should be name of this controller
> +- marvell,path-num: Should be path number exists in this controller.
> +- marvell,clk-name: Should be name of clock this controller using.
> +
> +Required sub-node:
> +- path:
> +Required properties in this sub-node:
> +-- marvell,path-name: Should be name of this path, fb/panel uses this name to
> +connect to this path.
> +-- marvell,overlay_num: Should be number of overlay this path has.
> +-- marvell,output-type: Should be output-type settings
> +-- marvell,path-config: Should be path-config settings
> +-- marvell,link-config: Should be link-config settings
> +-- marvell,rbswap: Should be rbswap settings
> +
> +3. panel
> +Required properties:
> +- marvell,path-name: Should be path name that this panel connected to.
> +- other properties each panel has.
> +
> +Examples:
> +
> +fb: fb {
> +	compatible = "marvell,mmp-fb";

This compatible should have the specific SoC name in it, not just
'mmp'. Otherwise you can't properly distinguish between this version and
future versions of the mmp core.

> +	marvell,fb-name = "mmp_fb";
> +	marvell,path-name = "mmp_pnpath";

You're not going to use this string to reference to another node, do
you? We have phandles for this.

> +	marvell,overlay-id = <0>;
> +	marvell,dmafetch-id = <1>;
> +	marvell,default-pixfmt = <0x108>;
> +};
> +
> +disp: disp@d420b000 {
> +	compatible = "marvell,mmp-disp";
> +	reg = <0xd420b000 0x1fc>;
> +	interrupts = <0 41 0x4>;
> +	marvell,disp-name = "mmp_disp";
> +	marvell,path-num = <1>;
> +	marvell,clk-name = "LCDCIHCLK";

Don't pass clk names like this. We have a documented clock binding, use
it.

> +#ifdef CONFIG_OF
> +	struct device_node *np;
> +#else
>  	struct mmp_buffer_driver_mach_info *mi;
> +#endif
>  	struct fb_info *info = 0;
>  	struct mmpfb_info *fbi = 0;
> -	int ret, modes_num;
> -
> -	mi = pdev->dev.platform_data;
> -	if (mi = NULL) {
> -		dev_err(&pdev->dev, "no platform data defined\n");
> -		return -EINVAL;
> -	}
> +	int ret = -EINVAL, modes_num;
> +	int overlay_id, dmafetch_id;
> +	const char *path_name;
>  
>  	/* initialize fb */
>  	info = framebuffer_alloc(sizeof(struct mmpfb_info), &pdev->dev);
>  	if (info = NULL)
>  		return -ENOMEM;
>  	fbi = info->par;
> -	if (!fbi) {
> -		ret = -EINVAL;
> +	if (!fbi)
> +		goto failed;
> +
> +#ifdef CONFIG_OF

Just because your kernel build does have CONFIG_OF enabled doesn't mean
it's actually started with a devicetree. You need to make a runtime
decision, not compile time.

Sascha

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Re: [PATCH] video: mmp: add device tree support

[Jingoo Han]

On Thursday, January 09, 2014 4:32 PM, Sascha Hauer wrote:
> On Thu, Jan 09, 2014 at 01:13:14PM +0800, Zhou Zhu wrote:
> > add device tree support for mmp fb/controller
> > the description at Documentation/devicetree/bindings/fb/mmp-disp.txt
> >
> > Signed-off-by: Zhou Zhu <zzhu3@marvell.com>
> > ---
> >  Documentation/devicetree/bindings/fb/mmp-disp.txt |   71 ++++++++++++
> >  drivers/video/mmp/fb/mmpfb.c                      |   71 ++++++++----
> >  drivers/video/mmp/hw/mmp_ctrl.c                   |  120 ++++++++++++++++-----
> >  3 files changed, 217 insertions(+), 45 deletions(-)
> >  create mode 100644 Documentation/devicetree/bindings/fb/mmp-disp.txt
> >
> > diff --git a/Documentation/devicetree/bindings/fb/mmp-disp.txt
> b/Documentation/devicetree/bindings/fb/mmp-disp.txt
> > new file mode 100644
> > index 0000000..3cf2903
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/fb/mmp-disp.txt

[.....]

> 
> > +#ifdef CONFIG_OF
> > +	struct device_node *np;
> > +#else
> >  	struct mmp_buffer_driver_mach_info *mi;
> > +#endif
> >  	struct fb_info *info = 0;
> >  	struct mmpfb_info *fbi = 0;
> > -	int ret, modes_num;
> > -
> > -	mi = pdev->dev.platform_data;
> > -	if (mi = NULL) {
> > -		dev_err(&pdev->dev, "no platform data defined\n");
> > -		return -EINVAL;
> > -	}
> > +	int ret = -EINVAL, modes_num;
> > +	int overlay_id, dmafetch_id;
> > +	const char *path_name;
> >
> >  	/* initialize fb */
> >  	info = framebuffer_alloc(sizeof(struct mmpfb_info), &pdev->dev);
> >  	if (info = NULL)
> >  		return -ENOMEM;
> >  	fbi = info->par;
> > -	if (!fbi) {
> > -		ret = -EINVAL;
> > +	if (!fbi)
> > +		goto failed;
> > +
> > +#ifdef CONFIG_OF
> 
> Just because your kernel build does have CONFIG_OF enabled doesn't mean
> it's actually started with a devicetree. You need to make a runtime
> decision, not compile time.

Yes, right.
As Sascha Hauer said, you need to make a runtime decision,
instead of compile time. Please keep the same binary for
both cases (CONFIG_OF is 'enabled' and 'disabled').

For example,

	if (pdev->dev.of_node) {
		// DT code
	} else {
		// Non-DT code
	}

Best regards,
Jingoo Han

Re: [PATCH] video: mmp: add device tree support

[Zhou Zhu]

Sascha/Jingoo,
Thank you for your review!

On 01/09/2014 03:43 PM, Jingoo Han wrote:
> On Thursday, January 09, 2014 4:32 PM, Sascha Hauer wrote:
>> On Thu, Jan 09, 2014 at 01:13:14PM +0800, Zhou Zhu wrote:
>>> add device tree support for mmp fb/controller
>>> the description at Documentation/devicetree/bindings/fb/mmp-disp.txt
>>>
>>> Signed-off-by: Zhou Zhu <zzhu3@marvell.com>
>>> ---
>>>   Documentation/devicetree/bindings/fb/mmp-disp.txt |   71 ++++++++++++
>>>   drivers/video/mmp/fb/mmpfb.c                      |   71 ++++++++----
>>>   drivers/video/mmp/hw/mmp_ctrl.c                   |  120 ++++++++++++++++-----
>>>   3 files changed, 217 insertions(+), 45 deletions(-)
>>>   create mode 100644 Documentation/devicetree/bindings/fb/mmp-disp.txt
>>>

[...]

>> +fb: fb {
>> +	compatible = "marvell,mmp-fb";
>
> This compatible should have the specific SoC name in it, not just
> 'mmp'. Otherwise you can't properly distinguish between this version and
> future versions of the mmp core.
>
We are using a same display IP for all mmp serial SoCs, and there would 
be inside register to get version. So I am planning put same compatible 
here for all SoCs using this IP.
Would it be ok if I update compatible to "marvell,mmpdcx-fb"? "mmpdcx" 
is the IP name.

 >
 >> +	marvell,fb-name = "mmp_fb";
 >> +	marvell,path-name = "mmp_pnpath";
 >
 > You're not going to use this string to reference to another node, do
 > you? We have phandles for this.
 >
I will update it in v2.

 >> +	marvell,overlay-id = <0>;
 >> +	marvell,dmafetch-id = <1>;
 >> +	marvell,default-pixfmt = <0x108>;
 >> +};
 >> +
 >> +disp: disp@d420b000 {
 >> +	compatible = "marvell,mmp-disp";
 >> +	reg = <0xd420b000 0x1fc>;
 >> +	interrupts = <0 41 0x4>;
 >> +	marvell,disp-name = "mmp_disp";
 >> +	marvell,path-num = <1>;
 >> +	marvell,clk-name = "LCDCIHCLK";
 >
 > Don't pass clk names like this. We have a documented clock binding, use
 > it.
 >
The patches to add dt support in common clk in our platforms are not 
upstreamed yet. As there's only one clock in this device, could I remove 
clock name related codes and direct use: devm_clk_get(dev, NULL)?

>
>>
>>> +#ifdef CONFIG_OF
>>> +	struct device_node *np;
>>> +#else
>>>   	struct mmp_buffer_driver_mach_info *mi;
>>> +#endif
>>>   	struct fb_info *info = 0;
>>>   	struct mmpfb_info *fbi = 0;
>>> -	int ret, modes_num;
>>> -
>>> -	mi = pdev->dev.platform_data;
>>> -	if (mi = NULL) {
>>> -		dev_err(&pdev->dev, "no platform data defined\n");
>>> -		return -EINVAL;
>>> -	}
>>> +	int ret = -EINVAL, modes_num;
>>> +	int overlay_id, dmafetch_id;
>>> +	const char *path_name;
>>>
>>>   	/* initialize fb */
>>>   	info = framebuffer_alloc(sizeof(struct mmpfb_info), &pdev->dev);
>>>   	if (info = NULL)
>>>   		return -ENOMEM;
>>>   	fbi = info->par;
>>> -	if (!fbi) {
>>> -		ret = -EINVAL;
>>> +	if (!fbi)
>>> +		goto failed;
>>> +
>>> +#ifdef CONFIG_OF
>>
>> Just because your kernel build does have CONFIG_OF enabled doesn't mean
>> it's actually started with a devicetree. You need to make a runtime
>> decision, not compile time.
>
> Yes, right.
> As Sascha Hauer said, you need to make a runtime decision,
> instead of compile time. Please keep the same binary for
> both cases (CONFIG_OF is 'enabled' and 'disabled').
>
> For example,
>
> 	if (pdev->dev.of_node) {
> 		// DT code
> 	} else {
> 		// Non-DT code
> 	}
>
Thank you for your suggestion. I will update the code to dynamic in v2.

-- 
Thanks, -Zhou

Re: [PATCH] video: mmp: add device tree support

[Zhou Zhu]

Sascha/Jingoo,
Thank you for your review!

On 01/09/2014 03:43 PM, Jingoo Han wrote:
> On Thursday, January 09, 2014 4:32 PM, Sascha Hauer wrote:
>> On Thu, Jan 09, 2014 at 01:13:14PM +0800, Zhou Zhu wrote:
>>> add device tree support for mmp fb/controller
>>> the description at Documentation/devicetree/bindings/fb/mmp-disp.txt
>>>
>>> Signed-off-by: Zhou Zhu <zzhu3-eYqpPyKDWXRBDgjK7y7TUQ@public.gmane.org>
>>> ---
>>>   Documentation/devicetree/bindings/fb/mmp-disp.txt |   71 ++++++++++++
>>>   drivers/video/mmp/fb/mmpfb.c                      |   71 ++++++++----
>>>   drivers/video/mmp/hw/mmp_ctrl.c                   |  120 ++++++++++++++++-----
>>>   3 files changed, 217 insertions(+), 45 deletions(-)
>>>   create mode 100644 Documentation/devicetree/bindings/fb/mmp-disp.txt
>>>

[...]

>> +fb: fb {
>> +	compatible = "marvell,mmp-fb";
>
> This compatible should have the specific SoC name in it, not just
> 'mmp'. Otherwise you can't properly distinguish between this version and
> future versions of the mmp core.
>
We are using a same display IP for all mmp serial SoCs, and there would 
be inside register to get version. So I am planning put same compatible 
here for all SoCs using this IP.
Would it be ok if I update compatible to "marvell,mmpdcx-fb"? "mmpdcx" 
is the IP name.

 >
 >> +	marvell,fb-name = "mmp_fb";
 >> +	marvell,path-name = "mmp_pnpath";
 >
 > You're not going to use this string to reference to another node, do
 > you? We have phandles for this.
 >
I will update it in v2.

 >> +	marvell,overlay-id = <0>;
 >> +	marvell,dmafetch-id = <1>;
 >> +	marvell,default-pixfmt = <0x108>;
 >> +};
 >> +
 >> +disp: disp@d420b000 {
 >> +	compatible = "marvell,mmp-disp";
 >> +	reg = <0xd420b000 0x1fc>;
 >> +	interrupts = <0 41 0x4>;
 >> +	marvell,disp-name = "mmp_disp";
 >> +	marvell,path-num = <1>;
 >> +	marvell,clk-name = "LCDCIHCLK";
 >
 > Don't pass clk names like this. We have a documented clock binding, use
 > it.
 >
The patches to add dt support in common clk in our platforms are not 
upstreamed yet. As there's only one clock in this device, could I remove 
clock name related codes and direct use: devm_clk_get(dev, NULL)?

>
>>
>>> +#ifdef CONFIG_OF
>>> +	struct device_node *np;
>>> +#else
>>>   	struct mmp_buffer_driver_mach_info *mi;
>>> +#endif
>>>   	struct fb_info *info = 0;
>>>   	struct mmpfb_info *fbi = 0;
>>> -	int ret, modes_num;
>>> -
>>> -	mi = pdev->dev.platform_data;
>>> -	if (mi == NULL) {
>>> -		dev_err(&pdev->dev, "no platform data defined\n");
>>> -		return -EINVAL;
>>> -	}
>>> +	int ret = -EINVAL, modes_num;
>>> +	int overlay_id, dmafetch_id;
>>> +	const char *path_name;
>>>
>>>   	/* initialize fb */
>>>   	info = framebuffer_alloc(sizeof(struct mmpfb_info), &pdev->dev);
>>>   	if (info == NULL)
>>>   		return -ENOMEM;
>>>   	fbi = info->par;
>>> -	if (!fbi) {
>>> -		ret = -EINVAL;
>>> +	if (!fbi)
>>> +		goto failed;
>>> +
>>> +#ifdef CONFIG_OF
>>
>> Just because your kernel build does have CONFIG_OF enabled doesn't mean
>> it's actually started with a devicetree. You need to make a runtime
>> decision, not compile time.
>
> Yes, right.
> As Sascha Hauer said, you need to make a runtime decision,
> instead of compile time. Please keep the same binary for
> both cases (CONFIG_OF is 'enabled' and 'disabled').
>
> For example,
>
> 	if (pdev->dev.of_node) {
> 		// DT code
> 	} else {
> 		// Non-DT code
> 	}
>
Thank you for your suggestion. I will update the code to dynamic in v2.

-- 
Thanks, -Zhou
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Re: [PATCH] video: mmp: add device tree support

['Sascha Hauer']

On Thu, Jan 09, 2014 at 08:09:09PM +0800, Zhou Zhu wrote:
> Sascha/Jingoo,
> Thank you for your review!
> 
> On 01/09/2014 03:43 PM, Jingoo Han wrote:
> >On Thursday, January 09, 2014 4:32 PM, Sascha Hauer wrote:
> >>On Thu, Jan 09, 2014 at 01:13:14PM +0800, Zhou Zhu wrote:
> >>>add device tree support for mmp fb/controller
> >>>the description at Documentation/devicetree/bindings/fb/mmp-disp.txt
> >>>
> >>>Signed-off-by: Zhou Zhu <zzhu3@marvell.com>
> >>>---
> >>>  Documentation/devicetree/bindings/fb/mmp-disp.txt |   71 ++++++++++++
> >>>  drivers/video/mmp/fb/mmpfb.c                      |   71 ++++++++----
> >>>  drivers/video/mmp/hw/mmp_ctrl.c                   |  120 ++++++++++++++++-----
> >>>  3 files changed, 217 insertions(+), 45 deletions(-)
> >>>  create mode 100644 Documentation/devicetree/bindings/fb/mmp-disp.txt
> >>>
> 
> [...]
> 
> >>+fb: fb {
> >>+	compatible = "marvell,mmp-fb";
> >
> >This compatible should have the specific SoC name in it, not just
> >'mmp'. Otherwise you can't properly distinguish between this version and
> >future versions of the mmp core.
> >
> We are using a same display IP for all mmp serial SoCs, and there
> would be inside register to get version. So I am planning put same
> compatible here for all SoCs using this IP.
> Would it be ok if I update compatible to "marvell,mmpdcx-fb"?
> "mmpdcx" is the IP name.

Using the SoC name is really good practice. This way you can add SoC
specific data to the compatible entry in the driver. Most bindings I've
seen which bind to some more generic string tend to add some additional
properties to the binding like marvell,has-new-feature or
marvell,needs-workaround-for-xy which you don't need at all if you bind
to the specific SoC in the first place.

If you insist on a generic binding you can still do a

	compatible = "marvell,soc-xy-fb", "marvell,mmp-fb";

This way you at least have the SoC information around (even in old
devicetrees) should you need it in the future.

BTW I've seen often enough that the version register is at a different
location on newer generations which makes it pretty useless.

> >> +	interrupts = <0 41 0x4>;
> >> +	marvell,disp-name = "mmp_disp";
> >> +	marvell,path-num = <1>;
> >> +	marvell,clk-name = "LCDCIHCLK";
> >
> > Don't pass clk names like this. We have a documented clock binding, use
> > it.
> >
> The patches to add dt support in common clk in our platforms are not
> upstreamed yet. As there's only one clock in this device, could I
> remove clock name related codes and direct use: devm_clk_get(dev,
> NULL)?

The clock name is defined by the device you are implementing, *not*
the name of the clock in the SoC. So if you have:

                                     ----------------------
   ---------  LCDCIHCLK             |            MMP       |
  | OSC/PLL |-----------------------|>pixclk               |
  ----------                        |                      |
                                     ----------------------


You have to do clk_get(dev, "pixclk") because you want to get the
clock associated to the pixclk input. Doing clk_get(dev, "LCDCIHCLK")
is wrong because that may change in future SoCs.
If you do this correctly there is no need to put the clk name into the
devicetree. You only have to put the information "which clk is connected
to the pixclk input of the MMP" into the devicetree.

Sascha

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

Re: [PATCH] video: mmp: add device tree support

['Sascha Hauer']

On Thu, Jan 09, 2014 at 08:09:09PM +0800, Zhou Zhu wrote:
> Sascha/Jingoo,
> Thank you for your review!
> 
> On 01/09/2014 03:43 PM, Jingoo Han wrote:
> >On Thursday, January 09, 2014 4:32 PM, Sascha Hauer wrote:
> >>On Thu, Jan 09, 2014 at 01:13:14PM +0800, Zhou Zhu wrote:
> >>>add device tree support for mmp fb/controller
> >>>the description at Documentation/devicetree/bindings/fb/mmp-disp.txt
> >>>
> >>>Signed-off-by: Zhou Zhu <zzhu3-eYqpPyKDWXRBDgjK7y7TUQ@public.gmane.org>
> >>>---
> >>>  Documentation/devicetree/bindings/fb/mmp-disp.txt |   71 ++++++++++++
> >>>  drivers/video/mmp/fb/mmpfb.c                      |   71 ++++++++----
> >>>  drivers/video/mmp/hw/mmp_ctrl.c                   |  120 ++++++++++++++++-----
> >>>  3 files changed, 217 insertions(+), 45 deletions(-)
> >>>  create mode 100644 Documentation/devicetree/bindings/fb/mmp-disp.txt
> >>>
> 
> [...]
> 
> >>+fb: fb {
> >>+	compatible = "marvell,mmp-fb";
> >
> >This compatible should have the specific SoC name in it, not just
> >'mmp'. Otherwise you can't properly distinguish between this version and
> >future versions of the mmp core.
> >
> We are using a same display IP for all mmp serial SoCs, and there
> would be inside register to get version. So I am planning put same
> compatible here for all SoCs using this IP.
> Would it be ok if I update compatible to "marvell,mmpdcx-fb"?
> "mmpdcx" is the IP name.

Using the SoC name is really good practice. This way you can add SoC
specific data to the compatible entry in the driver. Most bindings I've
seen which bind to some more generic string tend to add some additional
properties to the binding like marvell,has-new-feature or
marvell,needs-workaround-for-xy which you don't need at all if you bind
to the specific SoC in the first place.

If you insist on a generic binding you can still do a

	compatible = "marvell,soc-xy-fb", "marvell,mmp-fb";

This way you at least have the SoC information around (even in old
devicetrees) should you need it in the future.

BTW I've seen often enough that the version register is at a different
location on newer generations which makes it pretty useless.

> >> +	interrupts = <0 41 0x4>;
> >> +	marvell,disp-name = "mmp_disp";
> >> +	marvell,path-num = <1>;
> >> +	marvell,clk-name = "LCDCIHCLK";
> >
> > Don't pass clk names like this. We have a documented clock binding, use
> > it.
> >
> The patches to add dt support in common clk in our platforms are not
> upstreamed yet. As there's only one clock in this device, could I
> remove clock name related codes and direct use: devm_clk_get(dev,
> NULL)?

The clock name is defined by the device you are implementing, *not*
the name of the clock in the SoC. So if you have:

                                     ----------------------
   ---------  LCDCIHCLK             |            MMP       |
  | OSC/PLL |-----------------------|>pixclk               |
  ----------                        |                      |
                                     ----------------------


You have to do clk_get(dev, "pixclk") because you want to get the
clock associated to the pixclk input. Doing clk_get(dev, "LCDCIHCLK")
is wrong because that may change in future SoCs.
If you do this correctly there is no need to put the clk name into the
devicetree. You only have to put the information "which clk is connected
to the pixclk input of the MMP" into the devicetree.

Sascha

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