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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-06 01:02:30 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-06 01:02:30 +0000 |
commit | 76cb841cb886eef6b3bee341a2266c76578724ad (patch) | |
tree | f5892e5ba6cc11949952a6ce4ecbe6d516d6ce58 /arch/powerpc/sysdev/mpc5xxx_clocks.c | |
parent | Initial commit. (diff) | |
download | linux-c109f8d9e922037b3fa45f46d78384d49db8ad76.tar.xz linux-c109f8d9e922037b3fa45f46d78384d49db8ad76.zip |
Adding upstream version 4.19.249.upstream/4.19.249upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/powerpc/sysdev/mpc5xxx_clocks.c')
-rw-r--r-- | arch/powerpc/sysdev/mpc5xxx_clocks.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/arch/powerpc/sysdev/mpc5xxx_clocks.c b/arch/powerpc/sysdev/mpc5xxx_clocks.c new file mode 100644 index 000000000..834a6d7fb --- /dev/null +++ b/arch/powerpc/sysdev/mpc5xxx_clocks.c @@ -0,0 +1,31 @@ +// SPDX-License-Identifier: GPL-2.0 +/** + * mpc5xxx_get_bus_frequency - Find the bus frequency for a device + * @node: device node + * + * Returns bus frequency (IPS on MPC512x, IPB on MPC52xx), + * or 0 if the bus frequency cannot be found. + */ + +#include <linux/kernel.h> +#include <linux/of_platform.h> +#include <linux/export.h> +#include <asm/mpc5xxx.h> + +unsigned long mpc5xxx_get_bus_frequency(struct device_node *node) +{ + const unsigned int *p_bus_freq = NULL; + + of_node_get(node); + while (node) { + p_bus_freq = of_get_property(node, "bus-frequency", NULL); + if (p_bus_freq) + break; + + node = of_get_next_parent(node); + } + of_node_put(node); + + return p_bus_freq ? *p_bus_freq : 0; +} +EXPORT_SYMBOL(mpc5xxx_get_bus_frequency); |