1 files changed, 66 insertions, 0 deletions
diff --git a/drivers/clk/clk-stub.c b/drivers/clk/clk-stub.c
new file mode 100644
index 0000000..ea81703
--- /dev/null
+++ b/drivers/clk/clk-stub.c
@@ -0,0 +1,66 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Stub clk driver for non-essential clocks.
+ *
+ * This driver should be used for clock controllers
+ * which are described as dependencies in DT but aren't
+ * actually necessary for hardware functionality.
+ */
+
+#include <clk-uclass.h>
+#include <dm.h>
+
+/* NOP parent nodes to stub clocks */
+static const struct udevice_id nop_parent_ids[] = {
+	{ .compatible = "qcom,rpm-proc" },
+	{ .compatible = "qcom,glink-rpm" },
+	{ .compatible = "qcom,rpm-sm6115" },
+	{ }
+};
+
+U_BOOT_DRIVER(nop_parent) = {
+	.name = "nop_parent",
+	.id = UCLASS_NOP,
+	.of_match = nop_parent_ids,
+	.bind = dm_scan_fdt_dev,
+	.flags = DM_FLAG_DEFAULT_PD_CTRL_OFF,
+};
+
+static ulong stub_clk_set_rate(struct clk *clk, ulong rate)
+{
+	return (clk->rate = rate);
+}
+
+static ulong stub_clk_get_rate(struct clk *clk)
+{
+	return clk->rate;
+}
+
+static int stub_clk_nop(struct clk *clk)
+{
+	return 0;
+}
+
+static struct clk_ops stub_clk_ops = {
+	.set_rate = stub_clk_set_rate,
+	.get_rate = stub_clk_get_rate,
+	.enable = stub_clk_nop,
+	.disable = stub_clk_nop,
+};
+
+static const struct udevice_id stub_clk_ids[] = {
+	{ .compatible = "qcom,rpmcc" },
+	{ .compatible = "qcom,sm8250-rpmh-clk" },
+	{ .compatible = "qcom,sm8550-rpmh-clk" },
+	{ .compatible = "qcom,sm8650-rpmh-clk" },
+	{ }
+};
+
+U_BOOT_DRIVER(clk_stub) = {
+	.name = "clk_stub",
+	.id = UCLASS_CLK,
+	.ops = &stub_clk_ops,
+	.of_match = stub_clk_ids,
+	.flags = DM_FLAG_DEFAULT_PD_CTRL_OFF,
+};
+