drivers/gpu/drm/pl111/pl111_nomadik.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 #include <linux/device.h>
   3 #include <linux/regmap.h>
   4 #include <linux/mfd/syscon.h>
   5 #include <linux/bitops.h>
   6 #include <linux/module.h>
   7 #include "pl111_nomadik.h"
   8
   9 #define PMU_CTRL_OFFSET 0x0000
  10 #define PMU_CTRL_LCDNDIF BIT(26)
  11
  12 void pl111_nomadik_init(struct device *dev)
  13 {
  14         struct regmap *pmu_regmap;
  15
  16         /*
  17          * Just bail out of this is not found, we could be running
  18          * multiplatform on something else than Nomadik.
  19          */
  20         pmu_regmap =
  21                 syscon_regmap_lookup_by_compatible("stericsson,nomadik-pmu");
  22         if (IS_ERR(pmu_regmap))
  23                 return;
  24
  25         /*
  26          * This bit in the PMU controller multiplexes the two graphics
  27          * blocks found in the Nomadik STn8815. The other one is called
  28          * MDIF (Master Display Interface) and gets muxed out here.
  29          */
  30         regmap_update_bits(pmu_regmap,
  31                            PMU_CTRL_OFFSET,
  32                            PMU_CTRL_LCDNDIF,
  33                            0);
  34         dev_info(dev, "set Nomadik PMU mux to CLCD mode\n");
  35 }
  36 EXPORT_SYMBOL_GPL(pl111_nomadik_init);