linux-kernel - [RFC PATCH v5 3/6] PM / devfreq: exynos-bus: Add registration of interconnect child device

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Message-Id: <20200529163200.18031-4-s.nawrocki@samsung.com>
Date:   Fri, 29 May 2020 18:31:57 +0200
From:   Sylwester Nawrocki <s.nawrocki@...sung.com>
To:     georgi.djakov@...aro.org, cw00.choi@...sung.com, krzk@...nel.org
Cc:     a.swigon@...sung.com, myungjoo.ham@...sung.com,
        inki.dae@...sung.com, sw0312.kim@...sung.com,
        b.zolnierkie@...sung.com, m.szyprowski@...sung.com,
        s.nawrocki@...sung.com, linux-kernel@...r.kernel.org,
        linux-samsung-soc@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org
Subject: [RFC PATCH v5 3/6] PM / devfreq: exynos-bus: Add registration of
 interconnect child device

This patch adds registration of a child platform device for the exynos
interconnect driver. It is assumed that the interconnect provider will
only be needed when #interconnect-cells property is present in the bus
DT node, hence the child device will be created only when such a property
is present.

Signed-off-by: Sylwester Nawrocki <s.nawrocki@...sung.com>

Changes for v5:
 - new patch.
---
 drivers/devfreq/exynos-bus.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/drivers/devfreq/exynos-bus.c b/drivers/devfreq/exynos-bus.c
index 8fa8eb5..856e37d 100644
--- a/drivers/devfreq/exynos-bus.c
+++ b/drivers/devfreq/exynos-bus.c
@@ -24,6 +24,7 @@
 
 struct exynos_bus {
 	struct device *dev;
+	struct platform_device *icc_pdev;
 
 	struct devfreq *devfreq;
 	struct devfreq_event_dev **edev;
@@ -156,6 +157,8 @@ static void exynos_bus_exit(struct device *dev)
 	if (ret < 0)
 		dev_warn(dev, "failed to disable the devfreq-event devices\n");
 
+	platform_device_unregister(bus->icc_pdev);
+
 	dev_pm_opp_of_remove_table(dev);
 	clk_disable_unprepare(bus->clk);
 	if (bus->opp_table) {
@@ -168,6 +171,8 @@ static void exynos_bus_passive_exit(struct device *dev)
 {
 	struct exynos_bus *bus = dev_get_drvdata(dev);
 
+	platform_device_unregister(bus->icc_pdev);
+
 	dev_pm_opp_of_remove_table(dev);
 	clk_disable_unprepare(bus->clk);
 }
@@ -431,6 +436,18 @@ static int exynos_bus_probe(struct platform_device *pdev)
 	if (ret < 0)
 		goto err;
 
+	/* Create child platform device for the interconnect provider */
+	if (of_get_property(dev->of_node, "#interconnect-cells", NULL)) {
+		    bus->icc_pdev = platform_device_register_data(
+						dev, "exynos-generic-icc",
+						PLATFORM_DEVID_AUTO, NULL, 0);
+
+		    if (IS_ERR(bus->icc_pdev)) {
+			    ret = PTR_ERR(bus->icc_pdev);
+			    goto err;
+		    }
+	}
+
 	max_state = bus->devfreq->profile->max_state;
 	min_freq = (bus->devfreq->profile->freq_table[0] / 1000);
 	max_freq = (bus->devfreq->profile->freq_table[max_state - 1] / 1000);
-- 
2.7.4