clk: Rename clk_get_by_driver_info()

This is actually a misnomer now, since the phandle info may contain
a driver_info index or a udevice index. Rename it to use the word
'phandle', which seems more accurate. Add a comment while we are here.

Also add a test for this function.

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

drivers/clk/clk-uclass.c

@@ -36,8 +36,8 @@ struct clk *dev_get_clk_ptr(struct udevice *dev)
 }
 
 #if CONFIG_IS_ENABLED(OF_PLATDATA)
-int clk_get_by_driver_info(struct udevice *dev, struct phandle_1_arg *cells,
-			   struct clk *clk)
+int clk_get_by_phandle(struct udevice *dev, const struct phandle_1_arg *cells,
+		       struct clk *clk)
 {
 	int ret;
 
@@ -413,6 +413,7 @@ int clk_get_by_name(struct udevice *dev, const char *name, struct clk *clk)
 
 	return clk_get_by_index(dev, index, clk);
 }
+#endif /* OF_REAL */
 
 int clk_get_by_name_nodev(ofnode node, const char *name, struct clk *clk)
 {
@@ -465,8 +466,6 @@ int clk_release_all(struct clk *clk, int count)
 	return 0;
 }
 
-#endif /* OF_REAL */
-
 int clk_request(struct udevice *dev, struct clk *clk)
 {
 	const struct clk_ops *ops;

drivers/mmc/ftsdc010_mci.c

@@ -433,7 +433,7 @@ static int ftsdc010_mmc_probe(struct udevice *dev)
 	chip->priv = dev;
 	chip->dev_index = 1;
 	memcpy(priv->minmax, dtplat->clock_freq_min_max, sizeof(priv->minmax));
-	ret = clk_get_by_driver_info(dev, dtplat->clocks, &priv->clk);
+	ret = clk_get_by_phandle(dev, dtplat->clocks, &priv->clk);
 	if (ret < 0)
 		return ret;
 #endif

drivers/mmc/rockchip_dw_mmc.c

@@ -123,7 +123,7 @@ static int rockchip_dwmmc_probe(struct udevice *dev)
 	priv->minmax[0] = 400000;  /*  400 kHz */
 	priv->minmax[1] = dtplat->max_frequency;
 
-	ret = clk_get_by_driver_info(dev, dtplat->clocks, &priv->clk);
+	ret = clk_get_by_phandle(dev, dtplat->clocks, &priv->clk);
 	if (ret < 0)
 		return ret;
 #else

drivers/ram/rockchip/sdram_rk3399.c

@@ -3107,7 +3107,7 @@ static int rk3399_dmc_init(struct udevice *dev)
 	      priv->cic, priv->pmugrf, priv->pmusgrf, priv->pmucru, priv->pmu);
 
 #if CONFIG_IS_ENABLED(OF_PLATDATA)
-	ret = clk_get_by_driver_info(dev, dtplat->clocks, &priv->ddr_clk);
+	ret = clk_get_by_phandle(dev, dtplat->clocks, &priv->ddr_clk);
 #else
 	ret = clk_get_by_index(dev, 0, &priv->ddr_clk);
 #endif

drivers/spi/rk_spi.c

@@ -183,7 +183,7 @@ static int conv_of_plat(struct udevice *dev)
 
 	plat->base = dtplat->reg[0];
 	plat->frequency = 20000000;
-	ret = clk_get_by_driver_info(dev, dtplat->clocks, &priv->clk);
+	ret = clk_get_by_phandle(dev, dtplat->clocks, &priv->clk);
 	if (ret < 0)
 		return ret;
 

include/clk.h

@@ -89,11 +89,36 @@ struct clk_bulk {
 
 #if CONFIG_IS_ENABLED(OF_CONTROL) && CONFIG_IS_ENABLED(CLK)
 struct phandle_1_arg;
-int clk_get_by_driver_info(struct udevice *dev,
-			   struct phandle_1_arg *cells, struct clk *clk);
+/**
+ * clk_get_by_phandle() - Get a clock by its phandle information (of-platadata)
+ *
+ * This function is used when of-platdata is enabled.
+ *
+ * This looks up a clock using the phandle info. With dtoc, each phandle in the
+ * 'clocks' property is transformed into an idx representing the device. For
+ * example:
+ *
+ *	clocks = <&dpll_mpu_ck 23>;
+ *
+ * might result in:
+ *
+ *	.clocks = {1, {23}},},
+ *
+ * indicating that the clock is udevice idx 1 in dt-plat.c with an argument of
+ * 23. This function can return a valid clock given the above information. In
+ * this example it would return a clock containing the 'dpll_mpu_ck' device and
+ * the clock ID 23.
+ *
+ * @dev: Device containing the phandle
+ * @cells: Phandle info
+ * @clock: A pointer to a clock struct to initialise
+ * @return 0 if OK, or a negative error code.
+ */
+int clk_get_by_phandle(struct udevice *dev, const struct phandle_1_arg *cells,
+		       struct clk *clk);
 
 /**
- * clk_get_by_index - Get/request a clock by integer index.
+ * clk_get_by_index() - Get/request a clock by integer index.
  *
  * This looks up and requests a clock. The index is relative to the client
  * device; each device is assumed to have n clocks associated with it somehow,

test/dm/of_platdata.c

@@ -1,6 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0+
 
 #include <common.h>
+#include <clk.h>
 #include <dm.h>
 #include <dt-structs.h>
 #include <dm/test.h>
@@ -222,3 +223,21 @@ static int dm_test_of_plat_parent(struct unit_test_state *uts)
 }
 DM_TEST(dm_test_of_plat_parent, UT_TESTF_SCAN_PDATA);
 #endif
+
+/* Test clocks with of-platdata */
+static int dm_test_of_plat_clk(struct unit_test_state *uts)
+{
+	struct dtd_sandbox_clk_test *plat;
+	struct udevice *dev;
+	struct clk clk;
+
+	ut_assertok(uclass_first_device_err(UCLASS_MISC, &dev));
+	ut_asserteq_str("sandbox_clk_test", dev->name);
+	plat = dev_get_plat(dev);
+
+	ut_assertok(clk_get_by_phandle(dev, &plat->clocks[0], &clk));
+	ut_asserteq_str("sandbox_fixed_clock", clk.dev->name);
+
+	return 0;
+}
+DM_TEST(dm_test_of_plat_clk, UT_TESTF_SCAN_PDATA);