Add devicetree support for imx framebuffer driver. It uses the generic
display bindings and helper functions.
Signed-off-by: Markus Pargmann <mpa@xxxxxxxxxxxxxx>
---
.../devicetree/bindings/video/fsl,imx-fb.txt | 30 ++++
drivers/video/imxfb.c | 176 +++++++++++++++++----
2 files changed, 173 insertions(+), 33 deletions(-)
create mode 100644 Documentation/devicetree/bindings/video/fsl,imx-fb.txt
diff --git a/Documentation/devicetree/bindings/video/fsl,imx-fb.txt b/Documentation/devicetree/bindings/video/fsl,imx-fb.txt
new file mode 100644
index 0000000..fd88d26
--- /dev/null
+++ b/Documentation/devicetree/bindings/video/fsl,imx-fb.txt
@@ -0,0 +1,30 @@
+Freescale imx21 Framebuffer
+
+This framebuffer driver supports chips imx1 and imx21.
+
+Required properties:
+- compatible : "fsl,<chip>-fb"
+- reg : Should contain 1 register ranges(address and length)
+- interrupts : One interrupt of the fb dev
+
+Required nodes:
+- display: a display node is required to initialize the lcd panel
+ This should be in the board dts. See definition in
+ Documentation/devicetree/bindings/video/via,vt8500-fb.txt
+- default-mode: a videomode node as specified in
+ Documentation/devicetree/bindings/video/via,vt8500-fb.txt
+
+Optional properties:
+- pwmr: Address of pwmr register
+- lscr1: Address of lscr1 register
+- dmacr: Address of dmacr register
+
+Example:
+
+ imxfb: fb@10021000 {
+ compatible = "fsl,imx27-fb", "fsl,imx21-fb";
+ interrupts = <61>;
+ reg = <0x10021000 0x1000>;
+ display = <&display0>;
+ default-mode = <&mode0>;
+ };
diff --git a/drivers/video/imxfb.c b/drivers/video/imxfb.c
index ef2b587..6f1b04c 100644
--- a/drivers/video/imxfb.c
+++ b/drivers/video/imxfb.c
@@ -32,6 +32,12 @@
#include <linux/io.h>
#include <linux/math64.h>
#include <linux/uaccess.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+
+#include <video/of_display_timing.h>
+#include <video/of_videomode.h>
+#include <video/videomode.h>
#include <linux/platform_data/video-imxfb.h>
@@ -120,7 +126,6 @@
/* Used fb-mode. Can be set on kernel command line, therefore file-static. */
static const char *fb_mode;
-
/*
* These are the bitfields for each
* display depth that we support.
@@ -192,6 +197,19 @@ static struct platform_device_id imxfb_devtype[] = {
};
MODULE_DEVICE_TABLE(platform, imxfb_devtype);
+static struct of_device_id imxfb_of_dev_id[] = {
+ {
+ .compatible = "fsl,imx1-fb",
+ .data = &imxfb_devtype[IMX1_FB],
+ }, {
+ .compatible = "fsl,imx21-fb",
+ .data = &imxfb_devtype[IMX21_FB],
+ }, {
+ /* sentinel */
+ }
+};
+MODULE_DEVICE_TABLE(of, imxfb_of_dev_id);
+
static inline int is_imx1_fb(struct imxfb_info *fbi)
{
return fbi->devtype == IMX1_FB;
@@ -324,6 +342,9 @@ static const struct imx_fb_videomode *imxfb_find_mode(struct imxfb_info *fbi)
struct imx_fb_videomode *m;
int i;
+ if (!fb_mode)
+ return &fbi->mode[0];
+
for (i = 0, m = &fbi->mode[0]; i < fbi->num_modes; i++, m++) {
if (!strcmp(m->mode.name, fb_mode))
return m;
@@ -758,13 +779,13 @@ static int imxfb_resume(struct platform_device *dev)
#define imxfb_resume NULL
#endif
-static int __init imxfb_init_fbinfo(struct platform_device *pdev)
+static int imxfb_init_fbinfo(struct platform_device *pdev)
{
struct imx_fb_platform_data *pdata = pdev->dev.platform_data;
struct fb_info *info = dev_get_drvdata(&pdev->dev);
struct imxfb_info *fbi = info->par;
- struct imx_fb_videomode *m;
- int i;
+ struct device_node *np;
+ int ret;
pr_debug("%s\n",__func__);
@@ -795,41 +816,93 @@ static int __init imxfb_init_fbinfo(struct platform_device *pdev)
info->fbops = &imxfb_ops;
info->flags = FBINFO_FLAG_DEFAULT |
FBINFO_READS_FAST;
- info->var.grayscale = pdata->cmap_greyscale;
- fbi->cmap_inverse = pdata->cmap_inverse;
- fbi->cmap_static = pdata->cmap_static;
- fbi->lscr1 = pdata->lscr1;
- fbi->dmacr = pdata->dmacr;
- fbi->pwmr = pdata->pwmr;
- fbi->lcd_power = pdata->lcd_power;
- fbi->backlight_power = pdata->backlight_power;
-
- for (i = 0, m = &pdata->mode[0]; i < pdata->num_modes; i++, m++)
- info->fix.smem_len = max_t(size_t, info->fix.smem_len,
- m->mode.xres * m->mode.yres * m->bpp / 8);
+ if (pdata) {
+ info->var.grayscale = pdata->cmap_greyscale;
+ fbi->cmap_inverse = pdata->cmap_inverse;
+ fbi->cmap_static = pdata->cmap_static;
+ fbi->lscr1 = pdata->lscr1;
+ fbi->dmacr = pdata->dmacr;
+ fbi->pwmr = pdata->pwmr;
+ fbi->lcd_power = pdata->lcd_power;
+ fbi->backlight_power = pdata->backlight_power;
+ } else {
+ np = pdev->dev.of_node;
+ info->var.grayscale = of_property_read_bool(np,
+ "cmap-greyscale");
+ fbi->cmap_inverse = of_property_read_bool(np, "cmap-inverse");
+ fbi->cmap_static = of_property_read_bool(np, "cmap-static");
+
+ ret = of_property_read_u32(np, "lscr1", &fbi->lscr1);
+ if (ret)
+ fbi->lscr1 = 0;
+ ret = of_property_read_u32(np, "dmacr", &fbi->dmacr);
+ if (ret)
+ fbi->dmacr = 0;
+ ret = of_property_read_u32(np, "pwmr", &fbi->pwmr);
+ if (ret)
+ fbi->pwmr = 0;
+
+ /* These two function pointers could be used by some specific
+ * platforms. */
+ fbi->lcd_power = NULL;
+ fbi->backlight_power = NULL;
+ }
return 0;
}
-static int __init imxfb_probe(struct platform_device *pdev)
+static int imxfb_of_read_mode(struct device_node *np,
+ struct imx_fb_videomode *imxfb_mode)
+{
+ int ret;
+ struct fb_videomode *of_mode = &imxfb_mode->mode;
+ u32 bpp;
+ u32 pcr;
+
+ ret = of_property_read_string(np, "model", &of_mode->name);
+ if (ret)
+ of_mode->name = NULL;
+
+ ret = of_get_fb_videomode(np, of_mode, OF_USE_NATIVE_MODE);
+ if (ret)
+ return ret;
+
+ ret = of_property_read_u32(np, "bpp", &bpp);
+ ret |= of_property_read_u32(np, "pcr", &pcr);
+
+ if (ret)
+ return ret;
+
+ if (bpp > 255)
+ return -EINVAL;
+
+ imxfb_mode->bpp = bpp;
+ imxfb_mode->pcr = pcr;
+
+ return ret;
+}
+
+static int imxfb_probe(struct platform_device *pdev)
{
struct imxfb_info *fbi;
struct fb_info *info;
struct imx_fb_platform_data *pdata;
struct resource *res;
+ struct imx_fb_videomode *m;
+ const struct of_device_id *of_id;
int ret, i;
dev_info(&pdev->dev, "i.MX Framebuffer driver\n");
+ of_id = of_match_device(imxfb_of_dev_id, &pdev->dev);
+ if (of_id)
+ pdev->id_entry = of_id->data;
+
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res)
return -ENODEV;
pdata = pdev->dev.platform_data;
- if (!pdata) {
- dev_err(&pdev->dev,"No platform_data available\n");
- return -ENOMEM;
- }
info = framebuffer_alloc(sizeof(struct imxfb_info), &pdev->dev);
if (!info)
@@ -837,15 +910,51 @@ static int __init imxfb_probe(struct platform_device *pdev)
fbi = info->par;
- if (!fb_mode)
- fb_mode = pdata->mode[0].mode.name;
-
platform_set_drvdata(pdev, info);
ret = imxfb_init_fbinfo(pdev);
if (ret < 0)
goto failed_init;
+ if (pdata) {
+ if (!fb_mode)
+ fb_mode = pdata->mode[0].mode.name;
+
+ fbi->mode = pdata->mode;
+ fbi->num_modes = pdata->num_modes;
+ } else {
+ struct device_node *display_np;
+ fb_mode = NULL;
+
+ display_np = of_parse_phandle(pdev->dev.of_node, "display", 0);
+ if (!display_np) {
+ dev_err(&pdev->dev, "No display defined in devicetree\n");
+ ret = -EINVAL;
+ goto failed_of_parse;
+ }
+
+ /*
+ * imxfb does not support more modes, we choose only the native
+ * mode.
+ */
+ fbi->num_modes = 1;
+
+ fbi->mode = devm_kzalloc(&pdev->dev,
+ sizeof(struct imx_fb_videomode), GFP_KERNEL);
+ if (!fbi->mode) {
+ ret = -ENOMEM;
+ goto failed_of_parse;
+ }
+
+ ret = imxfb_of_read_mode(display_np, fbi->mode);
+ if (ret)
+ goto failed_of_parse;
+ }
+
+ for (i = 0, m = &fbi->mode[0]; i < fbi->num_modes; i++, m++)
+ info->fix.smem_len = max_t(size_t, info->fix.smem_len,
+ m->mode.xres * m->mode.yres * m->bpp / 8);
+
res = request_mem_region(res->start, resource_size(res),
DRIVER_NAME);
if (!res) {
@@ -878,7 +987,8 @@ static int __init imxfb_probe(struct platform_device *pdev)
goto failed_ioremap;
}
- if (!pdata->fixed_screen_cpu) {
+ /* Seems not being used by anyone, so no support for oftree */
+ if (!pdata || !pdata->fixed_screen_cpu) {
fbi->map_size = PAGE_ALIGN(info->fix.smem_len);
fbi->map_cpu = dma_alloc_writecombine(&pdev->dev,
fbi->map_size, &fbi->map_dma, GFP_KERNEL);
@@ -903,18 +1013,16 @@ static int __init imxfb_probe(struct platform_device *pdev)
info->fix.smem_start = fbi->screen_dma;
}
- if (pdata->init) {
+ if (pdata && pdata->init) {
ret = pdata->init(fbi->pdev);
if (ret)
goto failed_platform_init;
}
- fbi->mode = pdata->mode;
- fbi->num_modes = pdata->num_modes;
INIT_LIST_HEAD(&info->modelist);
- for (i = 0; i < pdata->num_modes; i++)
- fb_add_videomode(&pdata->mode[i].mode, &info->modelist);
+ for (i = 0; i < fbi->num_modes; i++)
+ fb_add_videomode(&fbi->mode[i].mode, &info->modelist);
/*
* This makes sure that our colour bitfield
@@ -944,10 +1052,10 @@ static int __init imxfb_probe(struct platform_device *pdev)
failed_register:
fb_dealloc_cmap(&info->cmap);
failed_cmap:
- if (pdata->exit)
+ if (pdata && pdata->exit)
pdata->exit(fbi->pdev);
failed_platform_init:
- if (!pdata->fixed_screen_cpu)
+ if (pdata && !pdata->fixed_screen_cpu)
dma_free_writecombine(&pdev->dev,fbi->map_size,fbi->map_cpu,
fbi->map_dma);
failed_map:
@@ -956,6 +1064,7 @@ failed_ioremap:
failed_getclock:
release_mem_region(res->start, resource_size(res));
failed_req:
+failed_of_parse:
kfree(info->pseudo_palette);
failed_init:
platform_set_drvdata(pdev, NULL);
@@ -980,7 +1089,7 @@ static int imxfb_remove(struct platform_device *pdev)
unregister_framebuffer(info);
pdata = pdev->dev.platform_data;
- if (pdata->exit)
+ if (pdata && pdata->exit)
pdata->exit(fbi->pdev);
fb_dealloc_cmap(&info->cmap);
@@ -1009,6 +1118,7 @@ static struct platform_driver imxfb_driver = {
.shutdown = imxfb_shutdown,
.driver = {
.name = DRIVER_NAME,
+ .of_match_table = imxfb_of_dev_id,
},
.id_table = imxfb_devtype,
};
--
1.8.1.4
--
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