target/linux/omap/patches-3.14/0334-video-da8xx-fb-adding-dt-support.patch

   1 From 884d3962ef4787c8cf0b8a7a673531c623d1dff8 Mon Sep 17 00:00:00 2001
   2 From: Darren Etheridge <detheridge@ti.com>
   3 Date: Fri, 2 Aug 2013 15:35:36 -0500
   4 Subject: [PATCH 334/752] video: da8xx-fb: adding dt support
   5
   6 Enhancing driver to enable probe triggered by a corresponding dt entry.
   7
   8 Add da8xx-fb.txt documentation to devicetree section.
   9
  10 Obtain fb_videomode details for the connected lcd panel using the
  11 display timing details present in DT.
  12
  13 Ensure that platform data is present before checking whether platform
  14 callback is present (the one used to control backlight). So far this
  15 was not an issue as driver was purely non-DT triggered, but now DT
  16 support has been added this check must be performed.
  17
  18 v2: squashing multiple commits from Afzal Mohammed (afzal@ti.com)
  19 v3: remove superfluous cast
  20 v4: expose both ti,am3352-lcdc and ti,da830-lcdc for .compatible
  21         as driver can use enhanced features of all version of the
  22         silicon block.
  23 v5: addressed review comments from Prabhakar Lad
  24 v6: Changed the .compatible naming to match the existing drm bindings
  25         for am33xx devices
  26 v7: clarify which compatible to use in the documentation for DA850
  27
  28 Acked-by: Lad, Prabhakar <prabhakar.csengg@gmail.com>
  29 Signed-off-by: Darren Etheridge <detheridge@ti.com>
  30 ---
  31  .../devicetree/bindings/video/da8xx-fb.txt         |   42 +++++++++++++
  32  drivers/video/da8xx-fb.c                           |   66 +++++++++++++++++++-
  33  2 files changed, 105 insertions(+), 3 deletions(-)
  34  create mode 100644 Documentation/devicetree/bindings/video/da8xx-fb.txt
  35
  36 --- /dev/null
  37 +++ b/Documentation/devicetree/bindings/video/da8xx-fb.txt
  38 @@ -0,0 +1,42 @@
  39 +TI LCD Controller on DA830/DA850/AM335x SoC's
  40 +
  41 +Required properties:
  42 +- compatible:
  43 +       DA830, DA850 - "ti,da8xx-tilcdc"
  44 +       AM335x SoC's - "ti,am33xx-tilcdc"
  45 +- reg: Address range of lcdc register set
  46 +- interrupts: lcdc interrupt
  47 +- display-timings: typical videomode of lcd panel, represented as child.
  48 +  Refer Documentation/devicetree/bindings/video/display-timing.txt for
  49 +  display timing binding details. If multiple videomodes are mentioned
  50 +  in display timings node, typical videomode has to be mentioned as the
  51 +  native mode or it has to be first child (driver cares only for native
  52 +  videomode).
  53 +
  54 +Recommended properties:
  55 +- ti,hwmods: Name of the hwmod associated to the LCDC
  56 +
  57 +Example for am335x SoC's:
  58 +
  59 +lcdc@4830e000 {
  60 +       compatible = "ti,am33xx-tilcdc";
  61 +       reg =  <0x4830e000 0x1000>;
  62 +       interrupts = <36>;
  63 +       ti,hwmods = "lcdc";
  64 +       status = "okay";
  65 +       display-timings {
  66 +               800x480p62 {
  67 +                       clock-frequency = <30000000>;
  68 +                       hactive = <800>;
  69 +                       vactive = <480>;
  70 +                       hfront-porch = <39>;
  71 +                       hback-porch = <39>;
  72 +                       hsync-len = <47>;
  73 +                       vback-porch = <29>;
  74 +                       vfront-porch = <13>;
  75 +                       vsync-len = <2>;
  76 +                       hsync-active = <1>;
  77 +                       vsync-active = <1>;
  78 +               };
  79 +       };
  80 +};
  81 --- a/drivers/video/da8xx-fb.c
  82 +++ b/drivers/video/da8xx-fb.c
  83 @@ -36,6 +36,7 @@
  84  #include <linux/slab.h>
  85  #include <linux/delay.h>
  86  #include <linux/lcm.h>
  87 +#include <video/of_display_timing.h>
  88  #include <video/da8xx-fb.h>
  89  #include <asm/div64.h>
  90
  91 @@ -1311,12 +1312,54 @@ static struct fb_ops da8xx_fb_ops = {
  92         .fb_blank = cfb_blank,
  93  };
  94
  95 +static struct lcd_ctrl_config *da8xx_fb_create_cfg(struct platform_device *dev)
  96 +{
  97 +       struct lcd_ctrl_config *cfg;
  98 +
  99 +       cfg = devm_kzalloc(&dev->dev, sizeof(struct fb_videomode), GFP_KERNEL);
 100 +       if (!cfg)
 101 +               return NULL;
 102 +
 103 +       /* default values */
 104 +
 105 +       if (lcd_revision == LCD_VERSION_1)
 106 +               cfg->bpp = 16;
 107 +       else
 108 +               cfg->bpp = 32;
 109 +
 110 +       /*
 111 +        * For panels so far used with this LCDC, below statement is sufficient.
 112 +        * For new panels, if required, struct lcd_ctrl_cfg fields to be updated
 113 +        * with additional/modified values. Those values would have to be then
 114 +        * obtained from dt(requiring new dt bindings).
 115 +        */
 116 +
 117 +       cfg->panel_shade = COLOR_ACTIVE;
 118 +
 119 +       return cfg;
 120 +}
 121 +
 122  static struct fb_videomode *da8xx_fb_get_videomode(struct platform_device *dev)
 123  {
 124         struct da8xx_lcdc_platform_data *fb_pdata = dev_get_platdata(&dev->dev);
 125         struct fb_videomode *lcdc_info;
 126 +       struct device_node *np = dev->dev.of_node;
 127         int i;
 128
 129 +       if (np) {
 130 +               lcdc_info = devm_kzalloc(&dev->dev,
 131 +                                        sizeof(struct fb_videomode),
 132 +                                        GFP_KERNEL);
 133 +               if (!lcdc_info)
 134 +                       return NULL;
 135 +
 136 +               if (of_get_fb_videomode(np, lcdc_info, OF_USE_NATIVE_MODE)) {
 137 +                       dev_err(&dev->dev, "timings not available in DT\n");
 138 +                       return NULL;
 139 +               }
 140 +               return lcdc_info;
 141 +       }
 142 +
 143         for (i = 0, lcdc_info = known_lcd_panels;
 144                 i < ARRAY_SIZE(known_lcd_panels); i++, lcdc_info++) {
 145                 if (strcmp(fb_pdata->type, lcdc_info->name) == 0)
 146 @@ -1345,7 +1388,7 @@ static int fb_probe(struct platform_devi
 147         int ret;
 148         unsigned long ulcm;
 149
 150 -       if (fb_pdata == NULL) {
 151 +       if (fb_pdata == NULL && !device->dev.of_node) {
 152                 dev_err(&device->dev, "Can not get platform data\n");
 153                 return -ENOENT;
 154         }
 155 @@ -1385,7 +1428,10 @@ static int fb_probe(struct platform_devi
 156                 break;
 157         }
 158
 159 -       lcd_cfg = (struct lcd_ctrl_config *)fb_pdata->controller_data;
 160 +       if (device->dev.of_node)
 161 +               lcd_cfg = da8xx_fb_create_cfg(device);
 162 +       else
 163 +               lcd_cfg = fb_pdata->controller_data;
 164
 165         if (!lcd_cfg) {
 166                 ret = -EINVAL;
 167 @@ -1404,7 +1450,7 @@ static int fb_probe(struct platform_devi
 168         par->dev = &device->dev;
 169         par->lcdc_clk = tmp_lcdc_clk;
 170         par->lcdc_clk_rate = clk_get_rate(par->lcdc_clk);
 171 -       if (fb_pdata->panel_power_ctrl) {
 172 +       if (fb_pdata && fb_pdata->panel_power_ctrl) {
 173                 par->panel_power_ctrl = fb_pdata->panel_power_ctrl;
 174                 par->panel_power_ctrl(1);
 175         }
 176 @@ -1652,6 +1698,19 @@ static int fb_resume(struct platform_dev
 177  #define fb_resume NULL
 178  #endif
 179
 180 +#if IS_ENABLED(CONFIG_OF)
 181 +static const struct of_device_id da8xx_fb_of_match[] = {
 182 +       /*
 183 +        * this driver supports version 1 and version 2 of the
 184 +        * Texas Instruments lcd controller (lcdc) hardware block
 185 +        */
 186 +       {.compatible = "ti,da8xx-tilcdc", },
 187 +       {.compatible = "ti,am33xx-tilcdc", },
 188 +       {},
 189 +};
 190 +MODULE_DEVICE_TABLE(of, da8xx_fb_of_match);
 191 +#endif
 192 +
 193  static struct platform_driver da8xx_fb_driver = {
 194         .probe = fb_probe,
 195         .remove = fb_remove,
 196 @@ -1660,6 +1719,7 @@ static struct platform_driver da8xx_fb_d
 197         .driver = {
 198                    .name = DRIVER_NAME,
 199                    .owner = THIS_MODULE,
 200 +                  .of_match_table = of_match_ptr(da8xx_fb_of_match),
 201                    },
 202  };
 203  module_platform_driver(da8xx_fb_driver);