linux-stable/drivers/gpu/drm/sun4i/sun6i_drc.c
Dave Airlie 318313d1d4 Merge tag 'drm-misc-next-2016-11-16' of git://anongit.freedesktop.org/git/drm-misc into drm-next
Another pile of misc:
- Explicit fencing for atomic! Big thanks to Gustavo, Sean, Rob 3x, Brian
  and anyone else I've forgotten to make this happen.
- roll out fbdev helper ops to drivers (Stefan Christ)
- last bits of drm_crtc split-up&kerneldoc
- some drm_irq.c crtc functions cleanup
- prepare_fb helper for cma, works correctly with explicit fencing (Marek
  Vasut)
- misc small patches all over

* tag 'drm-misc-next-2016-11-16' of git://anongit.freedesktop.org/git/drm-misc: (51 commits)
  drm/fence: add out-fences support
  drm/fence: add fence timeline to drm_crtc
  drm/fence: add in-fences support
  drm/bridge: analogix_dp: return error if transfer none byte
  drm: drm_irq.h header cleanup
  drm/irq: Unexport drm_vblank_on/off
  drm/irq: Unexport drm_vblank_count
  drm/irq: Make drm_vblank_pre/post_modeset internal
  drm/nouveau: Use drm_crtc_vblank_off/on
  drm/amdgpu: Use drm_crtc_vblank_on/off for dce6
  drm/color: document NULL values and default settings better
  drm: Drop externs from drm_crtc.h
  drm: Move tile group code into drm_connector.c
  drm: Extract drm_mode_config.[hc]
  Revert "drm: Add aspect ratio parsing in DRM layer"
  Revert "drm: Add and handle new aspect ratios in DRM layer"
  drm/print: Move kerneldoc next to definition
  drm: Consolidate dumb buffer docs
  drm: Clean up kerneldoc for struct drm_driver
  drm: Extract drm_drv.h
  ...
2016-11-17 08:02:46 +10:00

120 lines
2.9 KiB
C

/*
* Copyright (C) 2016 Free Electrons
*
* Maxime Ripard <maxime.ripard@free-electrons.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*/
#include <linux/clk.h>
#include <linux/component.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/reset.h>
struct sun6i_drc {
struct clk *bus_clk;
struct clk *mod_clk;
struct reset_control *reset;
};
static int sun6i_drc_bind(struct device *dev, struct device *master,
void *data)
{
struct sun6i_drc *drc;
int ret;
drc = devm_kzalloc(dev, sizeof(*drc), GFP_KERNEL);
if (!drc)
return -ENOMEM;
dev_set_drvdata(dev, drc);
drc->reset = devm_reset_control_get(dev, NULL);
if (IS_ERR(drc->reset)) {
dev_err(dev, "Couldn't get our reset line\n");
return PTR_ERR(drc->reset);
}
ret = reset_control_deassert(drc->reset);
if (ret) {
dev_err(dev, "Couldn't deassert our reset line\n");
return ret;
}
drc->bus_clk = devm_clk_get(dev, "ahb");
if (IS_ERR(drc->bus_clk)) {
dev_err(dev, "Couldn't get our bus clock\n");
ret = PTR_ERR(drc->bus_clk);
goto err_assert_reset;
}
clk_prepare_enable(drc->bus_clk);
drc->mod_clk = devm_clk_get(dev, "mod");
if (IS_ERR(drc->mod_clk)) {
dev_err(dev, "Couldn't get our mod clock\n");
ret = PTR_ERR(drc->mod_clk);
goto err_disable_bus_clk;
}
clk_prepare_enable(drc->mod_clk);
return 0;
err_disable_bus_clk:
clk_disable_unprepare(drc->bus_clk);
err_assert_reset:
reset_control_assert(drc->reset);
return ret;
}
static void sun6i_drc_unbind(struct device *dev, struct device *master,
void *data)
{
struct sun6i_drc *drc = dev_get_drvdata(dev);
clk_disable_unprepare(drc->mod_clk);
clk_disable_unprepare(drc->bus_clk);
reset_control_assert(drc->reset);
}
static const struct component_ops sun6i_drc_ops = {
.bind = sun6i_drc_bind,
.unbind = sun6i_drc_unbind,
};
static int sun6i_drc_probe(struct platform_device *pdev)
{
return component_add(&pdev->dev, &sun6i_drc_ops);
}
static int sun6i_drc_remove(struct platform_device *pdev)
{
component_del(&pdev->dev, &sun6i_drc_ops);
return 0;
}
static const struct of_device_id sun6i_drc_of_table[] = {
{ .compatible = "allwinner,sun6i-a31-drc" },
{ .compatible = "allwinner,sun6i-a31s-drc" },
{ .compatible = "allwinner,sun8i-a33-drc" },
{ }
};
MODULE_DEVICE_TABLE(of, sun6i_drc_of_table);
static struct platform_driver sun6i_drc_platform_driver = {
.probe = sun6i_drc_probe,
.remove = sun6i_drc_remove,
.driver = {
.name = "sun6i-drc",
.of_match_table = sun6i_drc_of_table,
},
};
module_platform_driver(sun6i_drc_platform_driver);
MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
MODULE_DESCRIPTION("Allwinner A31 Dynamic Range Control (DRC) Driver");
MODULE_LICENSE("GPL");