linux-kernel - [PATCH 07/15] drm/panfrost: use device_property

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Date:   Sun, 10 May 2020 18:55:30 +0200
From:   Clément Péron <peron.clem@...il.com>
To:     Rob Herring <robh@...nel.org>,
        Tomeu Vizoso <tomeu.vizoso@...labora.com>,
        Steven Price <steven.price@....com>,
        Alyssa Rosenzweig <alyssa.rosenzweig@...labora.com>,
        Viresh Kumar <vireshk@...nel.org>, Nishanth Menon <nm@...com>,
        Stephen Boyd <sboyd@...nel.org>,
        Maxime Ripard <mripard@...nel.org>,
        Chen-Yu Tsai <wens@...e.org>
Cc:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Clément Péron <peron.clem@...il.com>
Subject: [PATCH 07/15] drm/panfrost: use device_property_present to check for OPP

Instead of expecting an error from dev_pm_opp_of_add_table()
do a simple device_property_present() check.

Signed-off-by: Clément Péron <peron.clem@...il.com>
---
 drivers/gpu/drm/panfrost/panfrost_devfreq.c | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/panfrost/panfrost_devfreq.c b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
index d9007f44b772..fce21c682414 100644
--- a/drivers/gpu/drm/panfrost/panfrost_devfreq.c
+++ b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
@@ -96,15 +96,19 @@ int panfrost_devfreq_init(struct panfrost_device *pfdev)
 	struct thermal_cooling_device *cooling;
 	struct panfrost_devfreq *pfdevfreq = &pfdev->pfdevfreq;
 
-	ret = dev_pm_opp_of_add_table(dev);
-	if (ret == -ENODEV) /* Optional, continue without devfreq */
+	if (!device_property_present(dev, "operating-points-v2"))
+		/* Optional, continue without devfreq */
 		return 0;
-	else if (ret)
-		return ret;
-	pfdevfreq->opp_of_table_added = true;
 
 	spin_lock_init(&pfdevfreq->lock);
 
+	ret = dev_pm_opp_of_add_table(dev);
+	if (ret) {
+		DRM_DEV_ERROR(dev, "Couldn't add OPP table\n");
+		goto err_fini;
+	}
+	pfdevfreq->opp_of_table_added = true;
+
 	panfrost_devfreq_reset(pfdevfreq);
 
 	cur_freq = clk_get_rate(pfdev->clock);
-- 
2.20.1