linux-kernel - [PATCH v2 5/7] clk: raspberrypi: register platform device for raspberrypi-cpufreq

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Date:   Thu,  6 Jun 2019 16:22:58 +0200
From:   Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
To:     stefan.wahren@...e.com, linux-kernel@...r.kernel.org
Cc:     mbrugger@...e.de, viresh.kumar@...aro.org, rjw@...ysocki.net,
        sboyd@...nel.org, eric@...olt.net, f.fainelli@...il.com,
        bcm-kernel-feedback-list@...adcom.com, ptesarik@...e.com,
        linux-rpi-kernel@...ts.infradead.org, ssuloev@...altech.com,
        linux-clk@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        mturquette@...libre.com, linux-pm@...r.kernel.org,
        Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
Subject: [PATCH v2 5/7] clk: raspberrypi: register platform device for raspberrypi-cpufreq

As 'clk-raspberrypi' depends on RPi's firmware interface, which might be
configured as a module, the cpu clock might not be available for the
cpufreq driver during it's init process. So we register the
'raspberrypi-cpufreq' platform device after the probe sequence succeeds.

Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
Acked-by: Eric Anholt <eric@...olt.net>
---
 drivers/clk/bcm/clk-raspberrypi.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/clk/bcm/clk-raspberrypi.c b/drivers/clk/bcm/clk-raspberrypi.c
index b1365cf19f3a..052296b5fbe4 100644
--- a/drivers/clk/bcm/clk-raspberrypi.c
+++ b/drivers/clk/bcm/clk-raspberrypi.c
@@ -63,6 +63,8 @@ struct raspberrypi_firmware_prop {
 	__le32 disable_turbo;
 } __packed;
 
+static struct platform_device *rpi_cpufreq;
+
 static int raspberrypi_clock_property(struct rpi_firmware *firmware, u32 tag,
 				      u32 clk, u32 *val)
 {
@@ -285,6 +287,17 @@ static int raspberrypi_clk_probe(struct platform_device *pdev)
 		return ret;
 	}
 
+	rpi_cpufreq = platform_device_register_data(dev, "raspberrypi-cpufreq",
+						    -1, NULL, 0);
+
+	return 0;
+}
+
+static int raspberrypi_clk_remove(struct platform_device *pdev)
+{
+	platform_device_unregister(rpi_cpufreq);
+	rpi_cpufreq = NULL;
+
 	return 0;
 }
 
@@ -293,6 +306,7 @@ static struct platform_driver raspberrypi_clk_driver = {
 		.name = "raspberrypi-clk",
 	},
 	.probe          = raspberrypi_clk_probe,
+	.remove		= raspberrypi_clk_remove,
 };
 module_platform_driver(raspberrypi_clk_driver);
 
-- 
2.21.0