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Message-ID: <10b68f0c46a68d9b946d6cedfacb5a9efb476e37.1765373900.git.matthias.schiffer@ew.tq-group.com>
Date: Wed, 10 Dec 2025 14:52:51 +0100
From: Matthias Schiffer <matthias.schiffer@...tq-group.com>
To: Andi Shyti <andi.shyti@...nel.org>,
Lee Jones <lee@...nel.org>
Cc: linux-i2c@...r.kernel.org,
linux-kernel@...r.kernel.org,
linux@...tq-group.com,
Matthias Schiffer <matthias.schiffer@...tq-group.com>
Subject: [PATCH v4 2/4] mfd: tqmx86: refactor I2C setup
Preparation for supporting the second I2C controller, and detecting both
ocores and machxo2 controllers.
- Introduce tqmx86_detect_i2c1()
- Avoid the confusing "soft" I2C controller term - just call it the
ocores I2C
- Define TQMX86_REG_I2C_DETECT relative to I2C base register
Signed-off-by: Matthias Schiffer <matthias.schiffer@...tq-group.com>
---
v2: no changes
v3: no changes
v4:
- Keep resource and mfd_cell definitions at the toplevel
- The very generic tqmx86_detect_i2c() of the previous version is replaced with
tqmx86_detect_i2c1(), so we don't need to pass so many arguments around
drivers/mfd/tqmx86.c | 92 +++++++++++++++++++++++---------------------
1 file changed, 49 insertions(+), 43 deletions(-)
diff --git a/drivers/mfd/tqmx86.c b/drivers/mfd/tqmx86.c
index 1c2fe3f912389..6d304741f8989 100644
--- a/drivers/mfd/tqmx86.c
+++ b/drivers/mfd/tqmx86.c
@@ -18,7 +18,7 @@
#define TQMX86_IOBASE 0x180
#define TQMX86_IOSIZE 0x20
-#define TQMX86_IOBASE_I2C 0x1a0
+#define TQMX86_IOBASE_I2C1 0x1a0
#define TQMX86_IOSIZE_I2C 0xa
#define TQMX86_IOBASE_WATCHDOG 0x18b
#define TQMX86_IOSIZE_WATCHDOG 0x2
@@ -56,8 +56,8 @@
#define TQMX86_REG_IO_EXT_INT_GPIO_SHIFT 4
#define TQMX86_REG_SAUC 0x17
-#define TQMX86_REG_I2C_DETECT 0x1a7
-#define TQMX86_REG_I2C_DETECT_SOFT 0xa5
+#define TQMX86_REG_I2C_DETECT 0x7
+#define TQMX86_REG_I2C_DETECT_OCORES 0xa5
static uint gpio_irq;
module_param(gpio_irq, uint, 0);
@@ -72,8 +72,8 @@ enum tqmx86_i2c1_resource_type {
TQMX86_I2C1_IRQ,
};
-static struct resource tqmx_i2c_soft_resources[] = {
- [TQMX86_I2C1_IO] = DEFINE_RES_IO(TQMX86_IOBASE_I2C, TQMX86_IOSIZE_I2C),
+static struct resource tqmx_i2c1_resources[] = {
+ [TQMX86_I2C1_IO] = DEFINE_RES_IO(TQMX86_IOBASE_I2C1, TQMX86_IOSIZE_I2C),
/* Placeholder for IRQ resource */
[TQMX86_I2C1_IRQ] = {},
};
@@ -93,26 +93,24 @@ static struct resource tqmx_gpio_resources[] = {
[TQMX86_GPIO_IRQ] = {},
};
-static struct i2c_board_info tqmx86_i2c_devices[] = {
+static const struct i2c_board_info tqmx86_i2c1_devices[] = {
{
/* 4K EEPROM at 0x50 */
I2C_BOARD_INFO("24c32", 0x50),
},
};
-static struct ocores_i2c_platform_data ocores_platform_data = {
- .num_devices = ARRAY_SIZE(tqmx86_i2c_devices),
- .devices = tqmx86_i2c_devices,
+static struct ocores_i2c_platform_data tqmx86_i2c1_platform_data_ocores = {
+ .num_devices = ARRAY_SIZE(tqmx86_i2c1_devices),
+ .devices = tqmx86_i2c1_devices,
};
-static const struct mfd_cell tqmx86_i2c_soft_dev[] = {
- {
- .name = "ocores-i2c",
- .platform_data = &ocores_platform_data,
- .pdata_size = sizeof(ocores_platform_data),
- .resources = tqmx_i2c_soft_resources,
- .num_resources = ARRAY_SIZE(tqmx_i2c_soft_resources),
- },
+static const struct mfd_cell tqmx86_i2c1_dev_ocores = {
+ .name = "ocores-i2c",
+ .platform_data = &tqmx86_i2c1_platform_data_ocores,
+ .pdata_size = sizeof(tqmx86_i2c1_platform_data_ocores),
+ .resources = tqmx_i2c1_resources,
+ .num_resources = ARRAY_SIZE(tqmx_i2c1_resources),
};
static const struct mfd_cell tqmx86_devs[] = {
@@ -246,13 +244,40 @@ static int tqmx86_setup_irq(struct device *dev, const char *label, u8 irq,
return 0;
}
+static int tqmx86_detect_i2c1(struct device *dev, void __iomem *io_base, int clock_khz)
+{
+ u8 i2c_det;
+
+ if (i2c1_irq) {
+ if (!tqmx86_setup_irq(dev, "I2C1", i2c1_irq, io_base,
+ TQMX86_REG_IO_EXT_INT_I2C1_SHIFT))
+ tqmx_i2c1_resources[TQMX86_I2C1_IRQ] = DEFINE_RES_IRQ(i2c1_irq);
+ }
+
+ /*
+ * The I2C_DETECT register is in the range assigned to the I2C driver
+ * later, so we don't extend TQMX86_IOSIZE. Use inb() for this one-off
+ * access instead of ioport_map + unmap.
+ */
+ i2c_det = inb(TQMX86_IOBASE_I2C1 + TQMX86_REG_I2C_DETECT);
+
+ if (i2c_det == TQMX86_REG_I2C_DETECT_OCORES) {
+ tqmx86_i2c1_platform_data_ocores.clock_khz = clock_khz;
+ return devm_mfd_add_devices(dev, PLATFORM_DEVID_NONE,
+ &tqmx86_i2c1_dev_ocores, 1, NULL, 0,
+ NULL);
+ }
+
+ return 0;
+}
+
static int tqmx86_probe(struct platform_device *pdev)
{
- u8 board_id, sauc, rev, i2c_det;
+ u8 board_id, sauc, rev;
struct device *dev = &pdev->dev;
const char *board_name;
void __iomem *io_base;
- int err;
+ int err, clock_khz;
io_base = devm_ioport_map(dev, TQMX86_IOBASE, TQMX86_IOSIZE);
if (!io_base)
@@ -267,13 +292,6 @@ static int tqmx86_probe(struct platform_device *pdev)
"Found %s - Board ID %d, PCB Revision %d, PLD Revision %d\n",
board_name, board_id, rev >> 4, rev & 0xf);
- /*
- * The I2C_DETECT register is in the range assigned to the I2C driver
- * later, so we don't extend TQMX86_IOSIZE. Use inb() for this one-off
- * access instead of ioport_map + unmap.
- */
- i2c_det = inb(TQMX86_REG_I2C_DETECT);
-
if (gpio_irq) {
err = tqmx86_setup_irq(dev, "GPIO", gpio_irq, io_base,
TQMX86_REG_IO_EXT_INT_GPIO_SHIFT);
@@ -281,23 +299,11 @@ static int tqmx86_probe(struct platform_device *pdev)
tqmx_gpio_resources[TQMX86_GPIO_IRQ] = DEFINE_RES_IRQ(gpio_irq);
}
- ocores_platform_data.clock_khz = tqmx86_board_id_to_clk_rate(dev, board_id);
-
- if (i2c_det == TQMX86_REG_I2C_DETECT_SOFT) {
- if (i2c1_irq) {
- err = tqmx86_setup_irq(dev, "I2C1", i2c1_irq, io_base,
- TQMX86_REG_IO_EXT_INT_I2C1_SHIFT);
- if (!err)
- tqmx_i2c_soft_resources[TQMX86_I2C1_IRQ] = DEFINE_RES_IRQ(i2c1_irq);
- }
-
- err = devm_mfd_add_devices(dev, PLATFORM_DEVID_NONE,
- tqmx86_i2c_soft_dev,
- ARRAY_SIZE(tqmx86_i2c_soft_dev),
- NULL, 0, NULL);
- if (err)
- return err;
- }
+ clock_khz = tqmx86_board_id_to_clk_rate(dev, board_id);
+
+ err = tqmx86_detect_i2c1(dev, io_base, clock_khz);
+ if (err)
+ return err;
return devm_mfd_add_devices(dev, PLATFORM_DEVID_NONE,
tqmx86_devs,
--
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