[PATCH 08/11] platform/x86: intel_cht_int33fe: Provide software nodes for the devices

Heikki Krogerus
2019-04-03T16:45:34Z

Software nodes provide two features that we will need later.
1) Software nodes can have references to other software nodes.
2) Software nodes can exist before a device entry is created.

Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
---
drivers/platform/x86/intel_cht_int33fe.c | 122 +++++++++++++++++------
1 file changed, 92 insertions(+), 30 deletions(-)

diff --git a/drivers/platform/x86/intel_cht_int33fe.c b/drivers/platform/x86/intel_cht_int33fe.c
index 657b8d61554c..2f12ce154489 100644
--- a/drivers/platform/x86/intel_cht_int33fe.c
+++ b/drivers/platform/x86/intel_cht_int33fe.c
@@ -24,15 +24,25 @@
#include <linux/platform_device.h>
#include <linux/regulator/consumer.h>
#include <linux/slab.h>
+#include <linux/pci.h>

#define EXPECTED_PTYPE 4

+enum {
+ INT33FE_NODE_FUSB302,
+ INT33FE_NODE_MAX17047,
+ INT33FE_NODE_PI3USB30532,
+ INT33FE_NODE_MAX,
+};
+
struct cht_int33fe_data {
struct i2c_client *max17047;
struct i2c_client *fusb302;
struct i2c_client *pi3usb30532;
/* Contain a list-head must be per device */
struct device_connection connections[4];
+
+ struct fwnode_handle *node[INT33FE_NODE_MAX];
};

/*
@@ -63,14 +73,6 @@ static int cht_int33fe_check_for_max17047(struct device *dev, void *data)
return 1;
}

-static struct i2c_client *cht_int33fe_find_max17047(void)
-{
- struct i2c_client *max17047 = NULL;
-
- i2c_for_each_dev(&max17047, cht_int33fe_check_for_max17047);
- return max17047;
-}
-
static const char * const max17047_suppliers[] = { "bq24190-charger" };

static const struct property_entry max17047_props[] = {
@@ -78,6 +80,36 @@ static const struct property_entry max17047_props[] = {
{ }
};

+static int
+cht_int33fe_max17047(struct device *dev, struct cht_int33fe_data *data)
+{
+ struct fwnode_handle *fwnode = data->node[INT33FE_NODE_MAX17047];
+ struct i2c_client *max17047 = NULL;
+ struct i2c_board_info board_info;
+ int ret;
+
+ i2c_for_each_dev(&max17047, cht_int33fe_check_for_max17047);
+ if (max17047) {
+ /* Pre-existing i2c-client for the max17047, add device-props */
+ max17047->dev.fwnode->secondary = fwnode;
+ /* And re-probe to get the new device-props applied. */
+ ret = device_reprobe(&max17047->dev);
+ if (ret)
+ dev_warn(dev, "Reprobing max17047 error: %d\n", ret);
+ return 0;
+ }
+
+ memset(&board_info, 0, sizeof(board_info));
+ strlcpy(board_info.type, "max17047", I2C_NAME_SIZE);
+ board_info.dev_name = "max17047";
+ board_info.fwnode = fwnode;
+ data->max17047 = i2c_acpi_new_device(dev, 1, &board_info);
+ if (IS_ERR(data->max17047))
+ return PTR_ERR(data->max17047);
+
+ return 0;
+}
+
static const struct property_entry fusb302_props[] = {
PROPERTY_ENTRY_STRING("linux,extcon-name", "cht_wcove_pwrsrc"),
PROPERTY_ENTRY_U32("fcs,max-sink-microvolt", 12000000),
@@ -86,12 +118,50 @@ static const struct property_entry fusb302_props[] = {
{ }
};

+static const struct property_entry *props[] = {
+ [INT33FE_NODE_FUSB302] = fusb302_props,
+ [INT33FE_NODE_MAX17047] = max17047_props,
+ [INT33FE_NODE_PI3USB30532] = NULL,
+};
+
+static void cht_int33fe_remove_nodes(struct cht_int33fe_data *data)
+{
+ int i;
+
+ for (i = 0; i < INT33FE_NODE_MAX; i++) {
+ fwnode_remove_software_node(data->node[i]);
+ data->node[i] = NULL;
+ }
+}
+
+static int cht_int33fe_add_nodes(struct cht_int33fe_data *data)
+{
+ struct fwnode_handle *fwnode;
+ int ret;
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(props); i++) {
+ fwnode = fwnode_create_software_node(props[i], NULL);
+ if (IS_ERR(fwnode)) {
+ ret = PTR_ERR(fwnode);
+ goto err_remove_nodes;
+ }
+ data->node[i] = fwnode;
+ }
+
+ return 0;
+
+err_remove_nodes:
+ cht_int33fe_remove_nodes(data);
+
+ return ret;
+}
+
static int cht_int33fe_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct i2c_board_info board_info;
struct cht_int33fe_data *data;
- struct i2c_client *max17047;
struct regulator *regulator;
unsigned long long ptyp;
acpi_status status;
@@ -151,26 +221,14 @@ static int cht_int33fe_probe(struct platform_device *pdev)
if (!data)
return -ENOMEM;

+ ret = cht_int33fe_add_nodes(data);
+ if (ret)
+ return ret;
+
/* Work around BIOS bug, see comment on cht_int33fe_find_max17047 */
- max17047 = cht_int33fe_find_max17047();
- if (max17047) {
- /* Pre-existing i2c-client for the max17047, add device-props */
- ret = device_add_properties(&max17047->dev, max17047_props);
- if (ret)
- return ret;
- /* And re-probe to get the new device-props applied. */
- ret = device_reprobe(&max17047->dev);
- if (ret)
- dev_warn(dev, "Reprobing max17047 error: %d\n", ret);
- } else {
- memset(&board_info, 0, sizeof(board_info));
- strlcpy(board_info.type, "max17047", I2C_NAME_SIZE);
- board_info.dev_name = "max17047";
- board_info.properties = max17047_props;
- data->max17047 = i2c_acpi_new_device(dev, 1, &board_info);
- if (IS_ERR(data->max17047))
- return PTR_ERR(data->max17047);
- }
+ ret = cht_int33fe_max17047(dev, data);
+ if (ret)
+ goto out_remove_nodes;

data->connections[0].endpoint[0] = "port0";
data->connections[0].endpoint[1] = "i2c-pi3usb30532-switch";
@@ -187,7 +245,7 @@ static int cht_int33fe_probe(struct platform_device *pdev)
memset(&board_info, 0, sizeof(board_info));
strlcpy(board_info.type, "typec_fusb302", I2C_NAME_SIZE);
board_info.dev_name = "fusb302";
- board_info.properties = fusb302_props;
+ board_info.fwnode = data->node[INT33FE_NODE_FUSB302];
board_info.irq = fusb302_irq;

data->fusb302 = i2c_acpi_new_device(dev, 2, &board_info);
@@ -198,6 +256,7 @@ static int cht_int33fe_probe(struct platform_device *pdev)

memset(&board_info, 0, sizeof(board_info));
board_info.dev_name = "pi3usb30532";
+ board_info.fwnode = data->node[INT33FE_NODE_PI3USB30532];
strlcpy(board_info.type, "pi3usb30532", I2C_NAME_SIZE);

data->pi3usb30532 = i2c_acpi_new_device(dev, 3, &board_info);
@@ -214,9 +273,11 @@ static int cht_int33fe_probe(struct platform_device *pdev)
i2c_unregister_device(data->fusb302);

out_unregister_max17047:
+ device_connections_remove(data->connections);
i2c_unregister_device(data->max17047);

- device_connections_remove(data->connections);
+out_remove_nodes:
+ cht_int33fe_remove_nodes(data);

return ret;
}
@@ -230,6 +291,7 @@ static int cht_int33fe_remove(struct platform_device *pdev)
i2c_unregister_device(data->max17047);

device_connections_remove(data->connections);
+ cht_int33fe_remove_nodes(data);

return 0;
}
--
2.20.1