From: Binbin Zhou <zhoubinbin@loongson.cn>
To: Wolfram Sang <wsa@kernel.org>,
Wolfram Sang <wsa+renesas@sang-engineering.com>,
Mika Westerberg <mika.westerberg@linux.intel.com>,
linux-i2c@vger.kernel.org
Cc: loongarch@lists.linux.dev, linux-acpi@vger.kernel.org,
WANG Xuerui <kernel@xen0n.name>,
Jianmin Lv <lvjianmin@loongson.cn>,
Binbin Zhou <zhoubinbin@loongson.cn>,
Huacai Chen <chenhuacai@loongson.cn>
Subject: [PATCH V2 1/4] i2c: gpio: Add support on ACPI-based system
Date: Mon, 26 Sep 2022 21:00:04 +0800 [thread overview]
Message-ID: <f5df899e2218c0cd8cc8782b4a8f157ebb9726bc.1664193316.git.zhoubinbin@loongson.cn> (raw)
In-Reply-To: <cover.1664193316.git.zhoubinbin@loongson.cn>
Add support for the ACPI-based device registration so that the driver
can be also enabled through ACPI table.
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Signed-off-by: Binbin Zhou <zhoubinbin@loongson.cn>
---
drivers/i2c/busses/i2c-gpio.c | 30 ++++++++++++++++++++++++++++++
1 file changed, 30 insertions(+)
diff --git a/drivers/i2c/busses/i2c-gpio.c b/drivers/i2c/busses/i2c-gpio.c
index b1985c1667e1..417eb31e0971 100644
--- a/drivers/i2c/busses/i2c-gpio.c
+++ b/drivers/i2c/busses/i2c-gpio.c
@@ -13,6 +13,7 @@
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/module.h>
+#include <linux/acpi.h>
#include <linux/of.h>
#include <linux/platform_data/i2c-gpio.h>
#include <linux/platform_device.h>
@@ -318,6 +319,24 @@ static void of_i2c_gpio_get_props(struct device_node *np,
of_property_read_bool(np, "i2c-gpio,scl-output-only");
}
+static void acpi_i2c_gpio_get_props(struct device *dev,
+ struct i2c_gpio_platform_data *pdata)
+{
+ u32 reg;
+
+ device_property_read_u32(dev, "delay-us", &pdata->udelay);
+
+ if (!device_property_read_u32(dev, "timeout-ms", ®))
+ pdata->timeout = msecs_to_jiffies(reg);
+
+ pdata->sda_is_open_drain =
+ device_property_read_bool(dev, "sda-open-drain");
+ pdata->scl_is_open_drain =
+ device_property_read_bool(dev, "scl-open-drain");
+ pdata->scl_is_output_only =
+ device_property_read_bool(dev, "scl-output-only");
+}
+
static struct gpio_desc *i2c_gpio_get_desc(struct device *dev,
const char *con_id,
unsigned int index,
@@ -375,6 +394,8 @@ static int i2c_gpio_probe(struct platform_device *pdev)
if (np) {
of_i2c_gpio_get_props(np, pdata);
+ } else if (ACPI_COMPANION(dev)) {
+ acpi_i2c_gpio_get_props(dev, pdata);
} else {
/*
* If all platform data settings are zero it is OK
@@ -491,10 +512,19 @@ static const struct of_device_id i2c_gpio_dt_ids[] = {
MODULE_DEVICE_TABLE(of, i2c_gpio_dt_ids);
#endif
+#ifdef CONFIG_ACPI
+static const struct acpi_device_id i2c_gpio_acpi_match[] = {
+ {"LOON0005"}, /*LoongArch*/
+ {}
+};
+MODULE_DEVICE_TABLE(acpi, i2c_gpio_acpi_match);
+#endif
+
static struct platform_driver i2c_gpio_driver = {
.driver = {
.name = "i2c-gpio",
.of_match_table = of_match_ptr(i2c_gpio_dt_ids),
+ .acpi_match_table = ACPI_PTR(i2c_gpio_acpi_match),
},
.probe = i2c_gpio_probe,
.remove = i2c_gpio_remove,
--
2.31.1
next prev parent reply other threads:[~2022-09-26 13:01 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-26 13:00 [PATCH V2 0/4] i2c: ls2x: Add support for the Loongson-2K/LS7A I2C Binbin Zhou
2022-09-26 13:00 ` Binbin Zhou [this message]
2022-09-26 14:59 ` [PATCH V2 1/4] i2c: gpio: Add support on ACPI-based system Mika Westerberg
2022-09-27 7:49 ` Arnd Bergmann
2022-09-26 15:39 ` Andy Shevchenko
2022-09-26 13:00 ` [PATCH V2 2/4] dt-bindings: i2c: add bindings for Loongson LS2X I2C Binbin Zhou
2022-09-26 13:00 ` [PATCH V2 3/4] i2c: Add driver for Loongson-2K/LS7A I2C controller Binbin Zhou
2022-09-26 16:06 ` Andy Shevchenko
2022-09-26 13:00 ` [PATCH V2 4/4] LoongArch: Enable LS2X I2C in loongson3_defconfig Binbin Zhou
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