[PATCH 3/8] clk: spacemit: k1: spawn reset device from per-syscon clock drivers

[Guodong Xu]

The K1 reset driver in drivers/reset/spacemit/ binds by name (no DT
of_match), so the per-syscon clock drivers must spawn it.

Add a .bind hook to k1_mpmu_clk, k1_apbc_clk and k1_apmu_clk that
calls spacemit_k1_reset_bind() to instantiate a UCLASS_RESET sibling
on the same ofnode.

Also introduce k1_apbc2_clk here. Its kernel DT node has #reset-cells
but no #clock-cells, so the driver exists only as the binding hook
for the apbc2 reset spawn.

With this in place, references such as
  resets = <&syscon_apbc RESET_TWSI0>;
in the kernel-mainline DT resolve correctly.

Signed-off-by: Guodong Xu <guodong at riscstar.com>
---
 drivers/clk/spacemit/clk-k1.c | 37 +++++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/drivers/clk/spacemit/clk-k1.c b/drivers/clk/spacemit/clk-k1.c
index 4c0972d952e..80eede251b8 100644
--- a/drivers/clk/spacemit/clk-k1.c
+++ b/drivers/clk/spacemit/clk-k1.c
@@ -13,6 +13,7 @@
 #include <dm/lists.h>
 #include <regmap.h>
 #include <linux/clk-provider.h>
+#include <soc/spacemit/k1-reset.h>
 #include <soc/spacemit/k1-syscon.h>
 
 #include "clk_common.h"
@@ -1670,6 +1671,26 @@ U_BOOT_DRIVER(k1_pll_clk) = {
 	.flags		= DM_FLAG_PRE_RELOC,
 };
 
+static int k1_mpmu_clk_bind(struct udevice *dev)
+{
+	return spacemit_k1_reset_bind(dev, SPACEMIT_K1_RESET_MPMU);
+}
+
+static int k1_apbc_clk_bind(struct udevice *dev)
+{
+	return spacemit_k1_reset_bind(dev, SPACEMIT_K1_RESET_APBC);
+}
+
+static int k1_apmu_clk_bind(struct udevice *dev)
+{
+	return spacemit_k1_reset_bind(dev, SPACEMIT_K1_RESET_APMU);
+}
+
+static int k1_apbc2_clk_bind(struct udevice *dev)
+{
+	return spacemit_k1_reset_bind(dev, SPACEMIT_K1_RESET_APBC2);
+}
+
 static const struct udevice_id k1_mpmu_clk_match[] = {
 	{ .compatible = "spacemit,k1-syscon-mpmu",
 	  .data = (ulong)&k1_ccu_mpmu_data },
@@ -1682,6 +1703,7 @@ U_BOOT_DRIVER(k1_mpmu_clk) = {
 	.name		= "k1_mpmu_clk",
 	.id		= UCLASS_CLK,
 	.of_match	= k1_mpmu_clk_match,
+	.bind		= k1_mpmu_clk_bind,
 	.probe		= k1_mpmu_clk_probe,
 	.ops		= &k1_mpmu_clk_ops,
 	.flags		= DM_FLAG_PRE_RELOC,
@@ -1699,6 +1721,7 @@ U_BOOT_DRIVER(k1_apbc_clk) = {
 	.name		= "k1_apbc_clk",
 	.id		= UCLASS_CLK,
 	.of_match	= k1_apbc_clk_match,
+	.bind		= k1_apbc_clk_bind,
 	.probe		= k1_apbc_clk_probe,
 	.ops		= &k1_apbc_clk_ops,
 	.flags		= DM_FLAG_PRE_RELOC,
@@ -1716,7 +1739,21 @@ U_BOOT_DRIVER(k1_apmu_clk) = {
 	.name		= "k1_apmu_clk",
 	.id		= UCLASS_CLK,
 	.of_match	= k1_apmu_clk_match,
+	.bind		= k1_apmu_clk_bind,
 	.probe		= k1_apmu_clk_probe,
 	.ops		= &k1_apmu_clk_ops,
 	.flags		= DM_FLAG_PRE_RELOC,
 };
+
+static const struct udevice_id k1_apbc2_clk_match[] = {
+	{ .compatible = "spacemit,k1-syscon-apbc2" },
+	{ /* sentinel */ },
+};
+
+U_BOOT_DRIVER(k1_apbc2_clk) = {
+	.name		= "k1_apbc2_clk",
+	.id		= UCLASS_CLK,
+	.of_match	= k1_apbc2_clk_match,
+	.bind		= k1_apbc2_clk_bind,
+	.flags		= DM_FLAG_PRE_RELOC,
+};

-- 
2.43.0