linux-kernel - [PATCH v2 09/11] memory: samsung: exynos5422-dmc: Replace the deprecated 'devfreq-events' property

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Message-Id: <20191220002430.11995-10-cw00.choi@samsung.com>
Date:   Fri, 20 Dec 2019 09:24:28 +0900
From:   Chanwoo Choi <cw00.choi@...sung.com>
To:     robh+dt@...nel.org, krzk@...nel.org, heiko@...ech.de,
        leonard.crestez@....com, lukasz.luba@....com
Cc:     mark.rutland@....com, a.swigon@...sung.com,
        m.szyprowski@...sung.com, kgene@...nel.org, cw00.choi@...sung.com,
        myungjoo.ham@...sung.com, kyungmin.park@...sung.com,
        linux-pm@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-rockchip@...ts.infradead.org
Subject: [PATCH v2 09/11] memory: samsung: exynos5422-dmc: Replace the
 deprecated 'devfreq-events' property

Replace the deprecated 'devfreq-events' property with 'exynos,ppmu-device'
property. But, to guarantee the backward-compatibility, keep the support
of 'devfreq-events' property.

Reviewed-by: Lukasz Luba <lukasz.luba@....com>
Signed-off-by: Chanwoo Choi <cw00.choi@...sung.com>
---
 drivers/memory/samsung/exynos5422-dmc.c | 29 ++++++++++++++++++++-----
 1 file changed, 23 insertions(+), 6 deletions(-)

diff --git a/drivers/memory/samsung/exynos5422-dmc.c b/drivers/memory/samsung/exynos5422-dmc.c
index f11fe29a69fc..6e8aa19e84d3 100644
--- a/drivers/memory/samsung/exynos5422-dmc.c
+++ b/drivers/memory/samsung/exynos5422-dmc.c
@@ -1270,10 +1270,17 @@ static int exynos5_dmc_init_clks(struct exynos5_dmc *dmc)
 static struct devfreq_event_dev *exynos5_dmc_get_edev(struct device_node *np,
 							int index)
 {
-	struct device_node *node = of_parse_phandle(np, "devfreq-events",
+	struct device_node *node = of_parse_phandle(np, "exynos,ppmu-device",
 							index);
-	if (!node)
-		return ERR_PTR(-ENODEV);
+	if (!node) {
+		 /*
+		  * Check the deprecated 'devfreq-events' property
+		  * to support backward-compatibility.
+		 */
+		node = of_parse_phandle(np, "devfreq-events", index);
+		if (!node)
+			return ERR_PTR(-ENODEV);
+	}
 	return devfreq_event_get_edev_by_node(node);
 }
 
@@ -1292,10 +1299,20 @@ static int exynos5_performance_counters_init(struct exynos5_dmc *dmc)
 	int ret, i;
 
 	dmc->num_counters = of_property_count_elems_of_size(dmc->dev->of_node,
-					"devfreq-events", sizeof(u32));
+					"exynos,ppmu-device", sizeof(u32));
 	if (dmc->num_counters < 0) {
-		dev_err(dmc->dev, "could not get devfreq-event counters\n");
-		return dmc->num_counters;
+		 /*
+		  * Check the deprecated 'devfreq-events' property
+		  * to support backward-compatibility.
+		 */
+		dmc->num_counters = of_property_count_elems_of_size(
+					dmc->dev->of_node,
+					"devfreq-events", sizeof(u32));
+		if (dmc->num_counters < 0) {
+			dev_err(dmc->dev,
+				"could not get devfreq-event counters\n");
+			return dmc->num_counters;
+		}
 	}
 
 	counters_size = sizeof(struct devfreq_event_dev) * dmc->num_counters;
-- 
2.17.1