[PATCH V4 2/2] video: drm: exynos: Add device tree support
Inki Dae
inki.dae at samsung.com
Thu Sep 20 02:29:44 EDT 2012
Hi,
I had merged this patch set but I realizes this patch has no
descriptions enough so please add the descriptions what is this patch.
2012/9/6 Leela Krishna Amudala <l.krishna at samsung.com>:
> Add device tree based discovery support for DRM-FIMD driver.
>
> Signed-off-by: Leela Krishna Amudala <l.krishna at samsung.com>
> ---
> Documentation/devicetree/bindings/fb/drm-fimd.txt | 80 +++++++++++++++++
and, how about making drm folder instead of fb? so like below;
Documentation/devicetree/bindings/drm/exynos/fimd.txt
Thanks,
Inki Dae
> drivers/gpu/drm/exynos/exynos_drm_fimd.c | 95 ++++++++++++++++++++-
> 2 files changed, 173 insertions(+), 2 deletions(-)
> create mode 100644 Documentation/devicetree/bindings/fb/drm-fimd.txt
>
> diff --git a/Documentation/devicetree/bindings/fb/drm-fimd.txt b/Documentation/devicetree/bindings/fb/drm-fimd.txt
> new file mode 100644
> index 0000000..4ff1829
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/fb/drm-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-fb" 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 3701fbe..a4fa8e9 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;
> @@ -1016,6 +1095,17 @@ 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-fb",
> + .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)
> @@ -1029,5 +1119,6 @@ struct platform_driver fimd_driver = {
> .name = "exynos-drm-fimd",
> .owner = THIS_MODULE,
> .pm = &fimd_pm_ops,
> + .of_match_table = of_match_ptr(fimd_dt_match),
> },
> };
> --
> 1.7.0.4
>
>
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