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From:   Maxime Ripard <maxime@cerno.tech>
To:     Nicolas Saenz Julienne <nsaenzjulienne@suse.de>,
        Eric Anholt <eric@anholt.net>
Cc:     dri-devel@lists.freedesktop.org,
        linux-rpi-kernel@lists.infradead.org,
        bcm-kernel-feedback-list@broadcom.com,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
        Dave Stevenson <dave.stevenson@raspberrypi.com>,
        Tim Gover <tim.gover@raspberrypi.com>,
        Phil Elwell <phil@raspberrypi.com>,
        Maxime Ripard <maxime@cerno.tech>,
        Michael Turquette <mturquette@baylibre.com>,
        Stephen Boyd <sboyd@kernel.org>, linux-clk@vger.kernel.org
Subject: [PATCH 07/89] clk: bcm: rpi: Allow the driver to be probed by DT
Date:   Mon, 24 Feb 2020 10:06:09 +0100
Message-Id: <c358081207dcf4f320a6b7e2932f0d5365bf3242.1582533919.git-series.maxime@cerno.tech>
In-Reply-To: <cover.6c896ace9a5a7840e9cec008b553cbb004ca1f91.1582533919.git-series.maxime@cerno.tech>
References: <cover.6c896ace9a5a7840e9cec008b553cbb004ca1f91.1582533919.git-series.maxime@cerno.tech>
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The current firmware clock driver for the RaspberryPi can only be probed by
manually registering an associated platform_device.

While this works fine for cpufreq where the device gets attached a clkdev
lookup, it would be tedious to maintain a table of all the devices using
one of the clocks exposed by the firmware.

Since the DT on the other hand is the perfect place to store those
associations, make the firmware clocks driver probe-able through the device
tree so that we can represent it as a node.

Cc: Michael Turquette <mturquette@baylibre.com>
Cc: Stephen Boyd <sboyd@kernel.org>
Cc: linux-clk@vger.kernel.org
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
---
 drivers/clk/bcm/clk-raspberrypi.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/clk/bcm/clk-raspberrypi.c b/drivers/clk/bcm/clk-raspberrypi.c
index 1654fd0eedc9..94870234824c 100644
--- a/drivers/clk/bcm/clk-raspberrypi.c
+++ b/drivers/clk/bcm/clk-raspberrypi.c
@@ -255,15 +255,13 @@ static int raspberrypi_clk_probe(struct platform_device *pdev)
 	struct raspberrypi_clk *rpi;
 	int ret;
 
-	firmware_node = of_find_compatible_node(NULL, NULL,
-					"raspberrypi,bcm2835-firmware");
+	firmware_node = of_parse_phandle(dev->of_node, "raspberrypi,firmware", 0);
 	if (!firmware_node) {
 		dev_err(dev, "Missing firmware node\n");
 		return -ENOENT;
 	}
 
 	firmware = rpi_firmware_get(firmware_node);
-	of_node_put(firmware_node);
 	if (!firmware)
 		return -EPROBE_DEFER;
 
@@ -300,9 +298,16 @@ static int raspberrypi_clk_remove(struct platform_device *pdev)
 	return 0;
 }
 
+static const struct of_device_id raspberrypi_clk_match[] = {
+        { .compatible = "raspberrypi,firmware-clocks" },
+        { },
+};
+MODULE_DEVICE_TABLE(of, raspberrypi_clk_match);
+
 static struct platform_driver raspberrypi_clk_driver = {
 	.driver = {
 		.name = "raspberrypi-clk",
+		.of_match_table = raspberrypi_clk_match,
 	},
 	.probe          = raspberrypi_clk_probe,
 	.remove		= raspberrypi_clk_remove,
-- 
git-series 0.9.1