diff options
Diffstat (limited to 'target/linux/bcm27xx/patches-5.4/950-0510-clk-bcm-rpi-Allow-the-driver-to-be-probed-by-DT.patch')
| -rw-r--r-- | target/linux/bcm27xx/patches-5.4/950-0510-clk-bcm-rpi-Allow-the-driver-to-be-probed-by-DT.patch | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/target/linux/bcm27xx/patches-5.4/950-0510-clk-bcm-rpi-Allow-the-driver-to-be-probed-by-DT.patch b/target/linux/bcm27xx/patches-5.4/950-0510-clk-bcm-rpi-Allow-the-driver-to-be-probed-by-DT.patch new file mode 100644 index 0000000000..d622d9ded5 --- /dev/null +++ b/target/linux/bcm27xx/patches-5.4/950-0510-clk-bcm-rpi-Allow-the-driver-to-be-probed-by-DT.patch @@ -0,0 +1,60 @@ +From faeea753ba262e2a781570f9db23c5773c5d20e7 Mon Sep 17 00:00:00 2001 +From: Maxime Ripard <maxime@cerno.tech> +Date: Mon, 23 Dec 2019 19:58:08 +0100 +Subject: [PATCH] clk: bcm: rpi: Allow the driver to be probed by DT + +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(-) + +--- a/drivers/clk/bcm/clk-raspberrypi.c ++++ b/drivers/clk/bcm/clk-raspberrypi.c +@@ -255,15 +255,13 @@ static int raspberrypi_clk_probe(struct + 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 + 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, |