[PATCH V3 2/2] video: drm: exynos: Add device tree support
Leela Krishna Amudala
l.krishna at samsung.com
Fri Aug 17 19:37:24 EST 2012
Hello,
On Fri, Aug 17, 2012 at 6:55 AM, Joonyoung Shim <dofmind at gmail.com> wrote:
> Hi,
>
> 2012/8/16 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 +++++++++++++++++
>> 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..8ad8814
>> --- /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-drm" for fimd using DRM frame work.
>
> Just use "samsung,exynos5-fb" and add to support exynos4-fb
>
In the first version of this patch set I used "samsung,exynos5-fb",
but as per Kyungmin Park's suggestion changed it to exynos5-drm.
>> + - 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:
>> + - supports-mipi-panel: Specifies the lcd is mipi panel type
>
> How is this property used?
>
As this driver can be interfaced through MIPI or eDP, Arch side code
will check whether this property is available or not, if it is
available then it assumes mipi panel is connected and certain clock
rate will be set to fimd clock, otherwise assumes other panel is
connected and other clock rate will be set at arch side.
>> + - 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-drm";
>> + 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 8379c59..1753846 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 drm_fimd_dt_match[];
>> +
>
> Please remove drm_ prefix over all.
>
Ok, will do that
>> static inline struct drm_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_node(drm_fimd_dt_match, pdev->dev.of_node);
>
> Use of_match_ptr().
>
Ok, will change it
>> + return (struct drm_fimd_driver_data *)match->data;
>> + }
>> +#endif
>> return (struct drm_fimd_driver_data *)
>> platform_get_device_id(pdev)->driver_data;
>> }
>> @@ -821,12 +831,79 @@ 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-vidout-tv", NULL))
>> + pd->vidcon0 |= VIDCON0_VIDOUT_TV;
>
> What is this?
>
I'll remove this property.
>> + 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 int 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;
>> @@ -834,7 +911,11 @@ 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;
>> @@ -1027,6 +1108,15 @@ static struct platform_device_id exynos_drm_fimd_driver_ids[] = {
>> };
>> MODULE_DEVICE_TABLE(platform, exynos_drm_fimd_driver_ids);
>>
>> +#ifdef CONFIG_OF
>> +static const struct of_device_id drm_fimd_dt_match[] = {
>> + { .compatible = "samsung,exynos5-drm",
>> + .data = &exynos5_drm_fimd_driver_data },
>
> Add also samsung,exynos4-fb.
>
Ok, will add it.
>> + {},
>> +};
>> +MODULE_DEVICE_TABLE(of, drm_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)
>> @@ -1040,5 +1130,6 @@ struct platform_driver fimd_driver = {
>> .name = "exynos-drm-fimd",
>> .owner = THIS_MODULE,
>> .pm = &fimd_pm_ops,
>> + .of_match_table = of_match_ptr(drm_fimd_dt_match),
>> },
>> };
>> --
>> 1.7.0.4
>>
>> _______________________________________________
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>> devicetree-discuss at lists.ozlabs.org
>> https://lists.ozlabs.org/listinfo/devicetree-discuss
>
> Thanks.
>
> --
> - Joonyoung Shim
> _______________________________________________
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