LXR linux/drivers/gpu/drm/pl111/pl111

   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
  12void 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}
  36EXPORT_SYMBOL_GPL(pl111_nomadik_init);
  37