[PATCH v1] mmc: socfpga_dw_mmc: Retrieve clock manager address via clocks phandle

[alif.zakuan.yuslaimi at altera.com]

From: Alif Zakuan Yuslaimi <alif.zakuan.yuslaimi at altera.com>

Improve the current clock manager base address retrieval by probing the
clocks phandle under the mmc node in the device tree instead of probing
the clock manager node name in the device tree.

This will help to make the driver more scalable for more families as we
no longer need to rely on the exact node name in the device tree to probe
the clock manager driver for its base address.

Signed-off-by: Alif Zakuan Yuslaimi <alif.zakuan.yuslaimi at altera.com>
---
 drivers/mmc/socfpga_dw_mmc.c | 19 +++++++++++++++----
 1 file changed, 15 insertions(+), 4 deletions(-)

diff --git a/drivers/mmc/socfpga_dw_mmc.c b/drivers/mmc/socfpga_dw_mmc.c
index 3b86bc9b18c..ff1dd0055f8 100644
--- a/drivers/mmc/socfpga_dw_mmc.c
+++ b/drivers/mmc/socfpga_dw_mmc.c
@@ -54,17 +54,28 @@ static int socfpga_dwmci_clksel(struct dwmci_host *host)
 	u32 sdmmc_mask = ((priv->smplsel & 0x7) << SYSMGR_SDMMC_SMPLSEL_SHIFT) |
 			 ((priv->drvsel & 0x7) << SYSMGR_SDMMC_DRVSEL_SHIFT);
 
-	/* Get clock manager base address */
+	struct udevice *mmc_dev = host->mmc->dev;
+	struct ofnode_phandle_args clkmgr_args;
 	struct udevice *clkmgr_dev;
-	int ret = uclass_get_device_by_name(UCLASS_CLK, "clock-controller at ffd10000", &clkmgr_dev);
+	fdt_addr_t clkmgr_base;
+	int ret;
 
+	/*
+	 * Get the clkmgr device from the first phandle in the "clocks" property.
+	 */
+	ret = dev_read_phandle_with_args(mmc_dev, "clocks", "#clock-cells", 0, 0, &clkmgr_args);
 	if (ret) {
-		printf("Failed to get clkmgr device: %d\n", ret);
+		printf("Failed to parse clocks property: %d\n", ret);
 		return ret;
 	}
 
-	fdt_addr_t clkmgr_base = dev_read_addr(clkmgr_dev);
+	ret = uclass_get_device_by_ofnode(UCLASS_CLK, clkmgr_args.node, &clkmgr_dev);
+	if (ret) {
+		printf("Failed to get clkmgr device: %d\n", ret);
+		return ret;
+	}
 
+	clkmgr_base = dev_read_addr(clkmgr_dev);
 	if (clkmgr_base == FDT_ADDR_T_NONE) {
 		printf("Failed to read base address from clkmgr DT node\n");
 		return -EINVAL;
-- 
2.35.3