linux-kernel - [PATCH v6 1/6] drm: panfrost: add optional bus

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Date:   Tue, 21 May 2019 18:10:57 +0200
From:   Clément Péron <peron.clem@...il.com>
To:     David Airlie <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        Chen-Yu Tsai <wens@...e.org>,
        Tomeu Vizoso <tomeu.vizoso@...labora.com>,
        Will Deacon <will.deacon@....com>,
        Robin Murphy <robin.murphy@....com>,
        Joerg Roedel <joro@...tes.org>,
        Neil Armstrong <narmstrong@...libre.com>,
        Steven Price <steven.price@....com>
Cc:     dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        iommu@...ts.linux-foundation.org,
        Clément Péron <peron.clem@...il.com>
Subject: [PATCH v6 1/6] drm: panfrost: add optional bus_clock

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@...il.com>
---
 drivers/gpu/drm/panfrost/panfrost_device.c | 22 ++++++++++++++++++++++
 drivers/gpu/drm/panfrost/panfrost_device.h |  1 +
 2 files changed, 23 insertions(+)

diff --git a/drivers/gpu/drm/panfrost/panfrost_device.c b/drivers/gpu/drm/panfrost/panfrost_device.c
index 3b2bced1b015..ccb8eb2a518c 100644
--- a/drivers/gpu/drm/panfrost/panfrost_device.c
+++ b/drivers/gpu/drm/panfrost/panfrost_device.c
@@ -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);
 }
 
diff --git a/drivers/gpu/drm/panfrost/panfrost_device.h b/drivers/gpu/drm/panfrost/panfrost_device.h
index 56f452dfb490..8074f221034b 100644
--- a/drivers/gpu/drm/panfrost/panfrost_device.h
+++ b/drivers/gpu/drm/panfrost/panfrost_device.h
@@ -66,6 +66,7 @@ struct panfrost_device {
 
 	void __iomem *iomem;
 	struct clk *clock;
+	struct clk *bus_clock;
 	struct regulator *regulator;
 	struct reset_control *rstc;
 
-- 
2.17.1