arm: airoha: introduce EN7523 helpers to get SCU and CHIP_SCU regmaps

We need access SCU and CHIP_SCU regmaps in several places (clk-airoha,
reset-airoha, airoha_eth). Unfortunately these regmaps can't be easily
retrieved with a common code, because of different Airoha SoCs uses
a different dts structure.

To make life easy we can write a commonly named SoC specific helpers
for these tasks. This patch implements helpers for Airoha EN7523 SoC.

Signed-off-by: Mikhail Kshevetskiy <mikhail.kshevetskiy@iopsys.eu>

diff --git a/arch/arm/include/asm/arch-en7523 b/arch/arm/include/asm/arch-en7523
new file mode 120000 (symlink)
index 0000000..d2317ed
--- /dev/null
+++ b/arch/arm/include/asm/arch-en7523
@@ -0,0 +1 @@
+arch-airoha
\ No newline at end of file

diff --git a/arch/arm/mach-airoha/en7523/Makefile b/arch/arm/mach-airoha/en7523/Makefile
index 886ab7e..51f978a 100644 (file)
--- a/arch/arm/mach-airoha/en7523/Makefile
+++ b/arch/arm/mach-airoha/en7523/Makefile
@@ -1,3 +1,4 @@
 # SPDX-License-Identifier:     GPL-2.0
 
 obj-y += init.o
+obj-y += scu-regmap.o

diff --git a/arch/arm/mach-airoha/en7523/scu-regmap.c b/arch/arm/mach-airoha/en7523/scu-regmap.c
new file mode 100644 (file)
index 0000000..1e201cb
--- /dev/null
+++ b/arch/arm/mach-airoha/en7523/scu-regmap.c
@@ -0,0 +1,38 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Author: Mikhail Kshevetskiy <mikhail.kshevetskiy@iopsys.eu>
+ */
+
+#include <dm/ofnode.h>
+#include <linux/err.h>
+#include <asm/arch/scu-regmap.h>
+
+static struct regmap *airoha_scu_node_regmap_by_index(unsigned int index)
+{
+       struct regmap *map;
+       ofnode node;
+       int err;
+
+       node = ofnode_by_compatible(ofnode_null(), "airoha,en7523-scu");
+       if (!ofnode_valid(node))
+               return ERR_PTR(-EINVAL);
+
+       /* CHIP_SCU (index=0), SCU (index=1) */
+       err = regmap_init_mem_index(node, &map, index);
+       if (err)
+               return ERR_PTR(err);
+
+       return map;
+}
+
+struct regmap *airoha_get_scu_regmap(void)
+{
+       /* CHIP_SCU (index=0), SCU (index=1) */
+       return airoha_scu_node_regmap_by_index(1);
+}
+
+struct regmap *airoha_get_chip_scu_regmap(void)
+{
+       /* CHIP_SCU (index=0), SCU (index=1) */
+       return airoha_scu_node_regmap_by_index(0);
+}