[PATCH V6 2/2] video: drm: exynos: Add device tree support
Leela Krishna Amudala
l.krishna at samsung.com
Fri Sep 21 21:22:16 EST 2012
This patch adds device tree based discovery support for exynos DRM-FIMD
driver which includes driver modification to handle platform data in
both the cases with DT and non-DT, Also adds the documentation for bindings.
Signed-off-by: Leela Krishna Amudala <l.krishna at samsung.com>
---
.../devicetree/bindings/drm/exynos/fimd.txt | 80 ++++++++++++++++
drivers/gpu/drm/exynos/exynos_drm_fimd.c | 95 +++++++++++++++++++-
2 files changed, 173 insertions(+), 2 deletions(-)
create mode 100644 Documentation/devicetree/bindings/drm/exynos/fimd.txt
diff --git a/Documentation/devicetree/bindings/drm/exynos/fimd.txt b/Documentation/devicetree/bindings/drm/exynos/fimd.txt
new file mode 100644
index 0000000..e94120c
--- /dev/null
+++ b/Documentation/devicetree/bindings/drm/exynos/fimd.txt
@@ -0,0 +1,80 @@
+* Samsung Display Controller using DRM frame work
+
+The display controller is used to transfer image data from memory to an
+external LCD driver interface. It supports various color formats such as
+rgb and yuv.
+
+Required properties:
+ - compatible: Should be "samsung,exynos5-fimd" or "samsung,exynos4-fimd" for
+ fimd using DRM frame work.
+ - reg: physical base address of the controller and length of memory
+ mapped region.
+ - interrupts: Three interrupts should be specified. The interrupts should be
+ specified in the following order.
+ - VSYNC interrupt
+ - FIFO level interrupt
+ - FIMD System Interrupt
+
+ - samsung,fimd-display: This property should specify the phandle of the
+ display device node which holds the video interface timing with the
+ below mentioned properties.
+
+ - lcd-htiming: Specifies the horizontal timing for the overlay. The
+ horizontal timing includes four parameters in the following order.
+
+ - horizontal back porch (in number of lcd clocks)
+ - horizontal front porch (in number of lcd clocks)
+ - hsync pulse width (in number of lcd clocks)
+ - Display panels X resolution.
+
+ - lcd-vtiming: Specifies the vertical timing for the overlay. The
+ vertical timing includes four parameters in the following order.
+
+ - vertical back porch (in number of lcd lines)
+ - vertical front porch (in number of lcd lines)
+ - vsync pulse width (in number of lcd clocks)
+ - Display panels Y resolution.
+
+
+ - samsung,default-window: Specifies the default window number of the fimd controller.
+
+ - samsung,fimd-win-bpp: Specifies the bits per pixel.
+
+Optional properties:
+ - samsung,fimd-vidout-rgb: Video output format is RGB.
+ - samsung,fimd-inv-vclk: invert video clock polarity.
+ - samsung,fimd-frame-rate: Number of video frames per second.
+
+Example:
+
+ The following is an example for the fimd controller is split into
+ two portions. The SoC specific portion can be specified in the SoC
+ specific dts file. The board specific portion can be specified in the
+ board specific dts file.
+
+ - SoC Specific portion
+
+ fimd {
+ compatible = "samsung,exynos5-fimd";
+ interrupt-parent = <&combiner>;
+ reg = <0x14400000 0x40000>;
+ interrupts = <18 5>, <18 4>, <18 6>;
+ };
+
+ - Board Specific portion
+
+ lcd_fimd0: lcd_panel0 {
+ lcd-htiming = <4 4 4 480>;
+ lcd-vtiming = <4 4 4 320>;
+ supports-mipi-panel;
+ };
+
+ fimd {
+ samsung,fimd-display = <&lcd_fimd0>;
+ samsung,fimd-vidout-rgb;
+ samsung,fimd-inv-vclk;
+ samsung,fimd-frame-rate = <60>;
+ samsung,default-window = <0>;
+ samsung,fimd-win-bpp = <32>;
+ };
+
diff --git a/drivers/gpu/drm/exynos/exynos_drm_fimd.c b/drivers/gpu/drm/exynos/exynos_drm_fimd.c
index 1ad10b6..b2d22ac 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_fimd.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_fimd.c
@@ -18,6 +18,7 @@
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/pm_runtime.h>
+#include <linux/of.h>
#include <video/samsung_fimd.h>
#include <drm/exynos_drm.h>
@@ -103,9 +104,18 @@ struct fimd_context {
struct exynos_drm_panel_info *panel;
};
+static const struct of_device_id fimd_dt_match[];
+
static inline struct fimd_driver_data *drm_fimd_get_driver_data(
struct platform_device *pdev)
{
+#ifdef CONFIG_OF
+ if (pdev->dev.of_node) {
+ const struct of_device_id *match;
+ match = of_match_ptr(fimd_dt_match);
+ return (struct fimd_driver_data *)match->data;
+ }
+#endif
return (struct fimd_driver_data *)
platform_get_device_id(pdev)->driver_data;
}
@@ -809,12 +819,77 @@ static int fimd_power_on(struct fimd_context *ctx, bool enable)
return 0;
}
+#ifdef CONFIG_OF
+static struct exynos_drm_fimd_pdata *drm_fimd_dt_parse_pdata(struct device *dev)
+{
+ struct device_node *np = dev->of_node;
+ struct device_node *disp_np;
+ struct exynos_drm_fimd_pdata *pd;
+ u32 data[4];
+
+ pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL);
+ if (!pd) {
+ dev_err(dev, "memory allocation for pdata failed\n");
+ return ERR_PTR(-ENOMEM);
+ }
+
+ if (of_get_property(np, "samsung,fimd-vidout-rgb", NULL))
+ pd->vidcon0 |= VIDCON0_VIDOUT_RGB | VIDCON0_PNRMODE_RGB;
+ if (of_get_property(np, "samsung,fimd-inv-hsync", NULL))
+ pd->vidcon1 |= VIDCON1_INV_HSYNC;
+ if (of_get_property(np, "samsung,fimd-inv-vsync", NULL))
+ pd->vidcon1 |= VIDCON1_INV_VSYNC;
+ if (of_get_property(np, "samsung,fimd-inv-vclk", NULL))
+ pd->vidcon1 |= VIDCON1_INV_VCLK;
+ if (of_get_property(np, "samsung,fimd-inv-vden", NULL))
+ pd->vidcon1 |= VIDCON1_INV_VDEN;
+
+ disp_np = of_parse_phandle(np, "samsung,fimd-display", 0);
+ if (!disp_np) {
+ dev_err(dev, "unable to find display panel info\n");
+ return ERR_PTR(-EINVAL);
+ }
+
+ if (of_property_read_u32_array(disp_np, "lcd-htiming", data, 4)) {
+ dev_err(dev, "invalid horizontal timing\n");
+ return ERR_PTR(-EINVAL);
+ }
+ pd->panel.timing.left_margin = data[0];
+ pd->panel.timing.right_margin = data[1];
+ pd->panel.timing.hsync_len = data[2];
+ pd->panel.timing.xres = data[3];
+
+ if (of_property_read_u32_array(disp_np, "lcd-vtiming", data, 4)) {
+ dev_err(dev, "invalid vertical timing\n");
+ return ERR_PTR(-EINVAL);
+ }
+ pd->panel.timing.upper_margin = data[0];
+ pd->panel.timing.lower_margin = data[1];
+ pd->panel.timing.vsync_len = data[2];
+ pd->panel.timing.yres = data[3];
+
+ of_property_read_u32(np, "samsung,fimd-frame-rate",
+ &pd->panel.timing.refresh);
+
+ of_property_read_u32(np, "samsung,default-window", &pd->default_win);
+
+ of_property_read_u32(np, "samsung,fimd-win-bpp", &pd->bpp);
+
+ return pd;
+}
+#else
+static struct exynos_drm_fimd_pdata *drm_fimd_dt_parse_pdata(struct device *dev)
+{
+ return NULL;
+}
+#endif /* CONFIG_OF */
+
static int __devinit fimd_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct fimd_context *ctx;
struct exynos_drm_subdrv *subdrv;
- struct exynos_drm_fimd_pdata *pdata;
+ struct exynos_drm_fimd_pdata *pdata = pdev->dev.platform_data;
struct exynos_drm_panel_info *panel;
struct resource *res;
int win;
@@ -822,7 +897,11 @@ static int __devinit fimd_probe(struct platform_device *pdev)
DRM_DEBUG_KMS("%s\n", __FILE__);
- pdata = pdev->dev.platform_data;
+ if (pdev->dev.of_node) {
+ pdata = drm_fimd_dt_parse_pdata(&pdev->dev);
+ if (IS_ERR(pdata))
+ return PTR_ERR(pdata);
+ }
if (!pdata) {
dev_err(dev, "no platform data specified\n");
return -EINVAL;
@@ -1011,6 +1090,17 @@ static struct platform_device_id fimd_driver_ids[] = {
};
MODULE_DEVICE_TABLE(platform, fimd_driver_ids);
+#ifdef CONFIG_OF
+static const struct of_device_id fimd_dt_match[] = {
+ { .compatible = "samsung,exynos5-fimd",
+ .data = &exynos5_fimd_driver_data },
+ { .compatible = "samsung,exynos4-fimd",
+ .data = &exynos4_fimd_driver_data },
+ {},
+};
+MODULE_DEVICE_TABLE(of, fimd_dt_match);
+#endif
+
static const struct dev_pm_ops fimd_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(fimd_suspend, fimd_resume)
SET_RUNTIME_PM_OPS(fimd_runtime_suspend, fimd_runtime_resume, NULL)
@@ -1024,5 +1114,6 @@ struct platform_driver fimd_driver = {
.name = "exynos4-fb",
.owner = THIS_MODULE,
.pm = &fimd_pm_ops,
+ .of_match_table = of_match_ptr(fimd_dt_match),
},
};
--
1.7.0.4
More information about the devicetree-discuss
mailing list