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drm: panfrost: add optional bus_clock

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Allwinner H6 has an ARM Mali-T720 MP2 which required a bus_clock.

Add an optional bus_clock at the init of the panfrost driver.

Signed-off-by: Clément Péron <peron.clem@gmail.com>
Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20190521161102.29620-2-peron.clem@gmail.com
This commit is contained in:
Clément Péron 2019-05-21 18:10:57 +02:00 committed by Rob Herring
parent d4db6c0890
commit b681af0bc1
2 changed files with 23 additions and 0 deletions
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22
drivers/gpu/drm/panfrost/panfrost_device.c
View file

@ -55,11 +55,33 @@ static int panfrost_clk_init(struct panfrost_device *pfdev)
if (err)
return err;
pfdev->bus_clock = devm_clk_get_optional(pfdev->dev, "bus");
if (IS_ERR(pfdev->bus_clock)) {
dev_err(pfdev->dev, "get bus_clock failed %ld\n",
PTR_ERR(pfdev->bus_clock));
return PTR_ERR(pfdev->bus_clock);
}
if (pfdev->bus_clock) {
rate = clk_get_rate(pfdev->bus_clock);
dev_info(pfdev->dev, "bus_clock rate = %lu\n", rate);
err = clk_prepare_enable(pfdev->bus_clock);
if (err)
goto disable_clock;
}
return 0;
disable_clock:
clk_disable_unprepare(pfdev->clock);
return err;
}
static void panfrost_clk_fini(struct panfrost_device *pfdev)
{
clk_disable_unprepare(pfdev->bus_clock);
clk_disable_unprepare(pfdev->clock);
}

1
drivers/gpu/drm/panfrost/panfrost_device.h
View file

@ -66,6 +66,7 @@ struct panfrost_device {
void __iomem *iomem;
struct clk *clock;
struct clk *bus_clock;
struct regulator *regulator;
struct reset_control *rstc;