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202 lines
6.0 KiB
202 lines
6.0 KiB
From 884d3962ef4787c8cf0b8a7a673531c623d1dff8 Mon Sep 17 00:00:00 2001
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From: Darren Etheridge <detheridge@ti.com>
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Date: Fri, 2 Aug 2013 15:35:36 -0500
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Subject: [PATCH 334/752] video: da8xx-fb: adding dt support
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Enhancing driver to enable probe triggered by a corresponding dt entry.
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Add da8xx-fb.txt documentation to devicetree section.
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Obtain fb_videomode details for the connected lcd panel using the
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display timing details present in DT.
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Ensure that platform data is present before checking whether platform
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callback is present (the one used to control backlight). So far this
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was not an issue as driver was purely non-DT triggered, but now DT
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support has been added this check must be performed.
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v2: squashing multiple commits from Afzal Mohammed (afzal@ti.com)
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v3: remove superfluous cast
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v4: expose both ti,am3352-lcdc and ti,da830-lcdc for .compatible
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as driver can use enhanced features of all version of the
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silicon block.
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v5: addressed review comments from Prabhakar Lad
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v6: Changed the .compatible naming to match the existing drm bindings
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for am33xx devices
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v7: clarify which compatible to use in the documentation for DA850
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Acked-by: Lad, Prabhakar <prabhakar.csengg@gmail.com>
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Signed-off-by: Darren Etheridge <detheridge@ti.com>
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---
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.../devicetree/bindings/video/da8xx-fb.txt | 42 +++++++++++++
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drivers/video/fbdev/da8xx-fb.c | 66 +++++++++++++++++++-
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2 files changed, 105 insertions(+), 3 deletions(-)
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create mode 100644 Documentation/devicetree/bindings/video/da8xx-fb.txt
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--- /dev/null
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+++ b/Documentation/devicetree/bindings/video/da8xx-fb.txt
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@@ -0,0 +1,42 @@
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+TI LCD Controller on DA830/DA850/AM335x SoC's
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+
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+Required properties:
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+- compatible:
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+ DA830, DA850 - "ti,da8xx-tilcdc"
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+ AM335x SoC's - "ti,am33xx-tilcdc"
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+- reg: Address range of lcdc register set
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+- interrupts: lcdc interrupt
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+- display-timings: typical videomode of lcd panel, represented as child.
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+ Refer Documentation/devicetree/bindings/video/display-timing.txt for
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+ display timing binding details. If multiple videomodes are mentioned
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+ in display timings node, typical videomode has to be mentioned as the
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+ native mode or it has to be first child (driver cares only for native
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+ videomode).
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+
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+Recommended properties:
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+- ti,hwmods: Name of the hwmod associated to the LCDC
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+
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+Example for am335x SoC's:
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+
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+lcdc@4830e000 {
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+ compatible = "ti,am33xx-tilcdc";
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+ reg = <0x4830e000 0x1000>;
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+ interrupts = <36>;
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+ ti,hwmods = "lcdc";
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+ status = "okay";
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+ display-timings {
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+ 800x480p62 {
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+ clock-frequency = <30000000>;
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+ hactive = <800>;
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+ vactive = <480>;
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+ hfront-porch = <39>;
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+ hback-porch = <39>;
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+ hsync-len = <47>;
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+ vback-porch = <29>;
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+ vfront-porch = <13>;
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+ vsync-len = <2>;
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+ hsync-active = <1>;
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+ vsync-active = <1>;
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+ };
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+ };
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+};
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--- a/drivers/video/fbdev/da8xx-fb.c
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+++ b/drivers/video/fbdev/da8xx-fb.c
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@@ -36,6 +36,7 @@
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#include <linux/slab.h>
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#include <linux/delay.h>
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#include <linux/lcm.h>
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+#include <video/of_display_timing.h>
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#include <video/da8xx-fb.h>
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#include <asm/div64.h>
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@@ -1317,12 +1318,54 @@ static struct fb_ops da8xx_fb_ops = {
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.fb_blank = cfb_blank,
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};
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+static struct lcd_ctrl_config *da8xx_fb_create_cfg(struct platform_device *dev)
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+{
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+ struct lcd_ctrl_config *cfg;
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+
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+ cfg = devm_kzalloc(&dev->dev, sizeof(struct fb_videomode), GFP_KERNEL);
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+ if (!cfg)
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+ return NULL;
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+
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+ /* default values */
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+
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+ if (lcd_revision == LCD_VERSION_1)
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+ cfg->bpp = 16;
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+ else
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+ cfg->bpp = 32;
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+
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+ /*
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+ * For panels so far used with this LCDC, below statement is sufficient.
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+ * For new panels, if required, struct lcd_ctrl_cfg fields to be updated
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+ * with additional/modified values. Those values would have to be then
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+ * obtained from dt(requiring new dt bindings).
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+ */
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+
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+ cfg->panel_shade = COLOR_ACTIVE;
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+
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+ return cfg;
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+}
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+
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static struct fb_videomode *da8xx_fb_get_videomode(struct platform_device *dev)
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{
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struct da8xx_lcdc_platform_data *fb_pdata = dev_get_platdata(&dev->dev);
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struct fb_videomode *lcdc_info;
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+ struct device_node *np = dev->dev.of_node;
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int i;
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+ if (np) {
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+ lcdc_info = devm_kzalloc(&dev->dev,
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+ sizeof(struct fb_videomode),
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+ GFP_KERNEL);
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+ if (!lcdc_info)
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+ return NULL;
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+
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+ if (of_get_fb_videomode(np, lcdc_info, OF_USE_NATIVE_MODE)) {
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+ dev_err(&dev->dev, "timings not available in DT\n");
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+ return NULL;
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+ }
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+ return lcdc_info;
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+ }
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+
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for (i = 0, lcdc_info = known_lcd_panels;
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i < ARRAY_SIZE(known_lcd_panels); i++, lcdc_info++) {
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if (strcmp(fb_pdata->type, lcdc_info->name) == 0)
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@@ -1351,7 +1394,7 @@ static int fb_probe(struct platform_devi
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int ret;
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unsigned long ulcm;
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- if (fb_pdata == NULL) {
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+ if (fb_pdata == NULL && !device->dev.of_node) {
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dev_err(&device->dev, "Can not get platform data\n");
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return -ENOENT;
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}
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@@ -1391,7 +1434,10 @@ static int fb_probe(struct platform_devi
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break;
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}
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- lcd_cfg = (struct lcd_ctrl_config *)fb_pdata->controller_data;
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+ if (device->dev.of_node)
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+ lcd_cfg = da8xx_fb_create_cfg(device);
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+ else
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+ lcd_cfg = fb_pdata->controller_data;
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if (!lcd_cfg) {
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ret = -EINVAL;
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@@ -1410,7 +1456,7 @@ static int fb_probe(struct platform_devi
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par->dev = &device->dev;
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par->lcdc_clk = tmp_lcdc_clk;
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par->lcdc_clk_rate = clk_get_rate(par->lcdc_clk);
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- if (fb_pdata->panel_power_ctrl) {
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+ if (fb_pdata && fb_pdata->panel_power_ctrl) {
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par->panel_power_ctrl = fb_pdata->panel_power_ctrl;
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par->panel_power_ctrl(1);
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}
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@@ -1654,12 +1700,26 @@ static int fb_resume(struct device *dev)
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static SIMPLE_DEV_PM_OPS(fb_pm_ops, fb_suspend, fb_resume);
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+#if IS_ENABLED(CONFIG_OF)
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+static const struct of_device_id da8xx_fb_of_match[] = {
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+ /*
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+ * this driver supports version 1 and version 2 of the
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+ * Texas Instruments lcd controller (lcdc) hardware block
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+ */
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+ {.compatible = "ti,da8xx-tilcdc", },
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+ {.compatible = "ti,am33xx-tilcdc", },
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+ {},
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+};
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+MODULE_DEVICE_TABLE(of, da8xx_fb_of_match);
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+#endif
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+
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static struct platform_driver da8xx_fb_driver = {
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.probe = fb_probe,
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.remove = fb_remove,
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.driver = {
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.name = DRIVER_NAME,
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.owner = THIS_MODULE,
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+ .of_match_table = of_match_ptr(da8xx_fb_of_match),
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.pm = &fb_pm_ops,
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},
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};
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