clk: sandbox: Create a special fixed-rate driver

Create a version of this driver for sandbox so that it can use the
of-platdata struct.

Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Simon Glass <sjg@chromium.org>

arch/sandbox/dts/sandbox.dtsi

@@ -31,7 +31,7 @@
 
 	clk_fixed: clk-fixed {
 		u-boot,dm-pre-reloc;
-		compatible = "fixed-clock";
+		compatible = "sandbox,fixed-clock";
 		#clock-cells = <0>;
 		clock-frequency = <1234>;
 	};

arch/sandbox/include/asm/clk.h

@@ -61,6 +61,14 @@ struct sandbox_clk_test {
 	struct clk_bulk bulk;
 };
 
+/* Platform data for the sandbox fixed-rate clock driver */
+struct sandbox_clk_fixed_rate_plat {
+#if CONFIG_IS_ENABLED(OF_PLATDATA)
+	struct dtd_sandbox_fixed_clock dtplat;
+#endif
+	struct clk_fixed_rate fixed;
+};
+
 /**
  * sandbox_clk_query_rate - Query the current rate of a sandbox clock.
  *

drivers/clk/clk_sandbox.c

@@ -9,6 +9,7 @@
 #include <errno.h>
 #include <malloc.h>
 #include <asm/clk.h>
+#include <linux/clk-provider.h>
 
 static ulong sandbox_clk_get_rate(struct clk *clk)
 {
@@ -171,3 +172,35 @@ int sandbox_clk_query_requested(struct udevice *dev, int id)
 		return -EINVAL;
 	return priv->requested[id];
 }
+
+int clk_fixed_rate_of_to_plat(struct udevice *dev)
+{
+	struct clk_fixed_rate *cplat;
+
+#if CONFIG_IS_ENABLED(OF_PLATDATA)
+	struct sandbox_clk_fixed_rate_plat *plat = dev_get_plat(dev);
+
+	cplat = &plat->fixed;
+	cplat->fixed_rate = plat->dtplat.clock_frequency;
+#else
+	cplat = to_clk_fixed_rate(dev);
+#endif
+	clk_fixed_rate_ofdata_to_plat_(dev, cplat);
+
+	return 0;
+}
+
+static const struct udevice_id sandbox_clk_fixed_rate_match[] = {
+	{ .compatible = "sandbox,fixed-clock" },
+	{ /* sentinel */ }
+};
+
+U_BOOT_DRIVER(sandbox_fixed_clock) = {
+	.name = "sandbox_fixed_clock",
+	.id = UCLASS_CLK,
+	.of_match = sandbox_clk_fixed_rate_match,
+	.of_to_plat = clk_fixed_rate_of_to_plat,
+	.plat_auto = sizeof(struct sandbox_clk_fixed_rate_plat),
+	.ops = &clk_fixed_rate_ops,
+	.flags = DM_FLAG_PRE_RELOC,
+};

test/dm/of_platdata.c

@@ -185,7 +185,7 @@ static int dm_test_of_plat_phandle(struct unit_test_state *uts)
 	plat = dev_get_plat(dev);
 
 	ut_assertok(device_get_by_driver_info_idx(plat->clocks[0].idx, &clk));
-	ut_asserteq_str("fixed_clock", clk->name);
+	ut_asserteq_str("sandbox_fixed_clock", clk->name);
 
 	ut_assertok(device_get_by_driver_info_idx(plat->clocks[1].idx, &clk));
 	ut_asserteq_str("sandbox_clk", clk->name);