ARM: socfpga: clk: Obtain handoff base clock via DM

Bind fixed clock driver to the base clock instantiated in the handoff
DT and use DM clock framework to get their clock rate. This replaces
the ad-hoc DT parsing present thus far.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Chin Liang See <chin.liang.see@intel.com>
Cc: Dinh Nguyen <dinguyen@kernel.org>
Cc: Ley Foon Tan <ley.foon.tan@intel.com>

arch/arm/mach-socfpga/Kconfig

@@ -11,6 +11,8 @@ config TARGET_SOCFPGA_ARRIA10
 	bool
 	select ALTERA_SDRAM
 	select SPL_BOARD_INIT if SPL
+	select CLK
+	select SPL_CLK if SPL
 	select DM_I2C
 	select DM_RESET
 	select SPL_DM_RESET if SPL

arch/arm/mach-socfpga/clock_manager_arria10.c

@@ -7,6 +7,8 @@
 #include <fdtdec.h>
 #include <asm/io.h>
 #include <dm.h>
+#include <clk.h>
+#include <dm/device-internal.h>
 #include <asm/arch/clock_manager.h>
 
 static const struct socfpga_clock_manager *clock_manager_base =
@@ -141,9 +143,9 @@ struct strtopu32 {
 };
 
 const struct strtopu32 dt_to_val[] = {
-	{ "/clocks/altera_arria10_hps_eosc1", &eosc1_hz},
-	{ "/clocks/altera_arria10_hps_cb_intosc_ls", &cb_intosc_hz},
-	{ "/clocks/altera_arria10_hps_f2h_free", &f2s_free_hz},
+	{ "altera_arria10_hps_eosc1", &eosc1_hz },
+	{ "altera_arria10_hps_cb_intosc_ls", &cb_intosc_hz },
+	{ "altera_arria10_hps_f2h_free", &f2s_free_hz },
 };
 
 static int of_to_struct(const void *blob, int node, const struct strtou32 *cfg_tab,
@@ -163,28 +165,39 @@ static int of_to_struct(const void *blob, int node, const struct strtou32 *cfg_t
 	return 0;
 }
 
-static void of_get_input_clks(const void *blob)
+static int of_get_input_clks(const void *blob)
 {
-	int node, i;
+	struct udevice *dev;
+	struct clk clk;
+	int i, ret;
 
 	for (i = 0; i < ARRAY_SIZE(dt_to_val); i++) {
-		node = fdt_path_offset(blob, dt_to_val[i].str);
+		memset(&clk, 0, sizeof(clk));
 
-		if (node < 0)
-			continue;
+		ret = uclass_get_device_by_name(UCLASS_CLK, dt_to_val[i].str,
+						&dev);
+		if (ret)
+			return ret;
+
+		ret = clk_request(dev, &clk);
+		if (ret)
+			return ret;
 
-		fdtdec_get_int_array(blob, node, "clock-frequency",
-				     dt_to_val[i].p, 1);
+		*dt_to_val[i].p = clk_get_rate(&clk);
 	}
+
+	return 0;
 }
 
 static int of_get_clk_cfg(const void *blob, struct mainpll_cfg *main_cfg,
 			  struct perpll_cfg *per_cfg)
 {
-	int node, child, len;
+	int ret, node, child, len;
 	const char *node_name;
 
-	of_get_input_clks(blob);
+	ret = of_get_input_clks(blob);
+	if (ret)
+		return ret;
 
 	node = fdtdec_next_compatible(blob, 0, COMPAT_ALTERA_SOCFPGA_CLK_INIT);