linux-kernel - [PATCH v5 03/27] firmware: rpi: Only create clocks device if we don't have a node for it

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Date:   Mon, 15 Jun 2020 10:40:43 +0200
From:   Maxime Ripard <maxime@...no.tech>
To:     Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
Cc:     linux-rpi-kernel@...ts.infradead.org,
        bcm-kernel-feedback-list@...adcom.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Dave Stevenson <dave.stevenson@...pberrypi.com>,
        Tim Gover <tim.gover@...pberrypi.com>,
        Phil Elwell <phil@...pberrypi.com>,
        Mike Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>, linux-clk@...r.kernel.org,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Maxime Ripard <maxime@...no.tech>
Subject: [PATCH v5 03/27] firmware: rpi: Only create clocks device if we don't have a node for it

The firmware clocks driver was previously probed through a platform_device
created by the firmware driver.

Since we will now have a node for that clocks driver, we need to create the
device only in the case where there's no node for it already.

Reviewed-by: Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
Tested-by: Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
Signed-off-by: Maxime Ripard <maxime@...no.tech>
---
 drivers/firmware/raspberrypi.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/firmware/raspberrypi.c b/drivers/firmware/raspberrypi.c
index ef8098856a47..b25901a77c09 100644
--- a/drivers/firmware/raspberrypi.c
+++ b/drivers/firmware/raspberrypi.c
@@ -208,6 +208,20 @@ rpi_register_hwmon_driver(struct device *dev, struct rpi_firmware *fw)
 
 static void rpi_register_clk_driver(struct device *dev)
 {
+	struct device_node *firmware;
+
+	/*
+	 * Earlier DTs don't have a node for the firmware clocks but
+	 * rely on us creating a platform device by hand. If we do
+	 * have a node for the firmware clocks, just bail out here.
+	 */
+	firmware = of_get_compatible_child(dev->of_node,
+					   "raspberrypi,firmware-clocks");
+	if (firmware) {
+		of_node_put(firmware);
+		return;
+	}
+
 	rpi_clk = platform_device_register_data(dev, "raspberrypi-clk",
 						-1, NULL, 0);
 }
-- 
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