[PATCH next v6 1/2] i2c: hisi: Add initial device tree support

[Weilong Chen]

The HiSilicon I2C controller can be used on embedded platform, which
boot from devicetree.

Signed-off-by: Weilong Chen <chenweilong@xxxxxxxxxx>
---
Change since v5:
- Use hisilicon,i2c-ascend910 as compatible string. For more information about
  the SoC at https://e.huawei.com/en/products/cloud-computing-dc/atlas/ascend-910
Link: https://lore.kernel.org/linux-i2c/20220920072215.161331-1-chenweilong@xxxxxxxxxx/

Change since v4:
- Remove the protection for the headers for ACPI/OF
Link: https://lore.kernel.org/lkml/20220909074842.281232-1-chenweilong@xxxxxxxxxx/T/

 drivers/i2c/busses/Kconfig    |  2 +-
 drivers/i2c/busses/i2c-hisi.c | 15 ++++++++++++++-
 2 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index 264e780ae32e..a2081c03f3c4 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -673,7 +673,7 @@ config I2C_HIGHLANDER
 
 config I2C_HISI
 	tristate "HiSilicon I2C controller"
-	depends on (ARM64 && ACPI) || COMPILE_TEST
+	depends on ARM64 || COMPILE_TEST
 	help
 	  Say Y here if you want to have Hisilicon I2C controller support
 	  available on the Kunpeng Server.
diff --git a/drivers/i2c/busses/i2c-hisi.c b/drivers/i2c/busses/i2c-hisi.c
index 76c3d8f6fc3c..d58a6d2f1bc6 100644
--- a/drivers/i2c/busses/i2c-hisi.c
+++ b/drivers/i2c/busses/i2c-hisi.c
@@ -5,6 +5,7 @@
  * Copyright (c) 2021 HiSilicon Technologies Co., Ltd.
  */
 
+#include <linux/acpi.h>
 #include <linux/bits.h>
 #include <linux/bitfield.h>
 #include <linux/completion.h>
@@ -13,6 +14,7 @@
 #include <linux/io.h>
 #include <linux/module.h>
 #include <linux/mod_devicetable.h>
+#include <linux/of.h>
 #include <linux/platform_device.h>
 #include <linux/property.h>
 #include <linux/units.h>
@@ -483,17 +485,28 @@ static int hisi_i2c_probe(struct platform_device *pdev)
 	return 0;
 }
 
+#ifdef CONFIG_ACPI
 static const struct acpi_device_id hisi_i2c_acpi_ids[] = {
 	{ "HISI03D1", 0 },
 	{ }
 };
 MODULE_DEVICE_TABLE(acpi, hisi_i2c_acpi_ids);
+#endif
+
+#ifdef CONFIG_OF
+static const struct of_device_id hisi_i2c_dts_ids[] = {
+	{ .compatible = "hisilicon,i2c-ascend910", },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, hisi_i2c_dts_ids);
+#endif
 
 static struct platform_driver hisi_i2c_driver = {
 	.probe		= hisi_i2c_probe,
 	.driver		= {
 		.name	= "hisi-i2c",
-		.acpi_match_table = hisi_i2c_acpi_ids,
+		.acpi_match_table = ACPI_PTR(hisi_i2c_acpi_ids),
+		.of_match_table = of_match_ptr(hisi_i2c_dts_ids),
 	},
 };
 module_platform_driver(hisi_i2c_driver);
-- 
2.31.GIT