@@ -284,6 +284,7 @@ config SPI_COLDFIRE_QSPI
config SPI_CS42L43
tristate "Cirrus Logic CS42L43 SPI controller"
depends on MFD_CS42L43 && PINCTRL_CS42L43
+ select GPIO_SWNODE_UNDEFINED
help
This enables support for the SPI controller inside the Cirrus Logic
CS42L43 audio codec.
@@ -5,10 +5,14 @@
// Copyright (C) 2022-2023 Cirrus Logic, Inc. and
// Cirrus Logic International Semiconductor Ltd.
+#include <linux/acpi.h>
+#include <linux/array_size.h>
#include <linux/bits.h>
#include <linux/bitfield.h>
#include <linux/device.h>
#include <linux/errno.h>
+#include <linux/gpio/machine.h>
+#include <linux/gpio/property.h>
#include <linux/mfd/cs42l43.h>
#include <linux/mfd/cs42l43-regs.h>
#include <linux/mod_devicetable.h>
@@ -16,6 +20,7 @@
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
+#include <linux/property.h>
#include <linux/regmap.h>
#include <linux/spi/spi.h>
#include <linux/units.h>
@@ -39,6 +44,44 @@ static const unsigned int cs42l43_clock_divs[] = {
2, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30
};
+static const struct software_node ampl = {
+ .name = "cs35l56-left",
+};
+
+static const struct software_node ampr = {
+ .name = "cs35l56-right",
+};
+
+static struct spi_board_info ampl_info = {
+ .modalias = "cs35l56",
+ .max_speed_hz = 20 * HZ_PER_MHZ,
+ .chip_select = 0,
+ .mode = SPI_MODE_0,
+ .swnode = &l,
+};
+
+static struct spi_board_info ampr_info = {
+ .modalias = "cs35l56",
+ .max_speed_hz = 20 * HZ_PER_MHZ,
+ .chip_select = 1,
+ .mode = SPI_MODE_0,
+ .swnode = &r,
+};
+
+static const struct software_node cs42l43_gpiochip_swnode = {
+ .name = "cs42l43-pinctrl",
+};
+
+static const struct software_node_ref_args cs42l43_cs_refs[] = {
+ SOFTWARE_NODE_REFERENCE(&cs42l43_gpiochip_swnode, 0, GPIO_ACTIVE_LOW),
+ SOFTWARE_NODE_REFERENCE(&swnode_gpio_undefined),
+};
+
+static const struct property_entry cs42l43_cs_props[] = {
+ PROPERTY_ENTRY_REF_ARRAY("cs-gpios", cs42l43_cs_refs),
+ {}
+};
+
static int cs42l43_spi_tx(struct regmap *regmap, const u8 *buf, unsigned int len)
{
const u8 *end = buf + len;
@@ -203,16 +246,59 @@ static size_t cs42l43_spi_max_length(struct spi_device *spi)
return CS42L43_SPI_MAX_LENGTH;
}
+static bool cs42l43_has_sidecar(struct fwnode_handle *fwnode)
+{
+ static const u32 func_smart_amp = 0x1;
+ struct fwnode_handle *child_fwnode, *ext_fwnode;
+ unsigned int val;
+ u32 function;
+ int ret;
+
+ fwnode_for_each_child_node(fwnode, child_fwnode) {
+ acpi_handle handle = ACPI_HANDLE_FWNODE(child_fwnode);
+
+ ret = acpi_get_local_address(handle, &function);
+ if (ret || function != func_smart_amp)
+ continue;
+
+ ext_fwnode = fwnode_get_named_child_node(child_fwnode,
+ "mipi-sdca-function-expansion-subproperties");
+ if (!ext_fwnode)
+ continue;
+
+ ret = fwnode_property_read_u32(ext_fwnode,
+ "01fa-cirrus-sidecar-instances",
+ &val);
+
+ fwnode_handle_put(ext_fwnode);
+
+ if (ret)
+ continue;
+
+ fwnode_handle_put(child_fwnode);
+
+ return !!val;
+ }
+
+ return false;
+}
+
static void cs42l43_release_of_node(void *data)
{
fwnode_handle_put(data);
}
+static void cs42l43_release_sw_node(void *data)
+{
+ software_node_unregister(&cs42l43_gpiochip_swnode);
+}
+
static int cs42l43_spi_probe(struct platform_device *pdev)
{
struct cs42l43 *cs42l43 = dev_get_drvdata(pdev->dev.parent);
struct cs42l43_spi *priv;
struct fwnode_handle *fwnode = dev_fwnode(cs42l43->dev);
+ bool has_sidecar = cs42l43_has_sidecar(fwnode);
int ret;
priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
@@ -266,14 +352,42 @@ static int cs42l43_spi_probe(struct platform_device *pdev)
}
}
- device_set_node(&priv->ctlr->dev, fwnode);
+ if (has_sidecar) {
+ ret = software_node_register(&cs42l43_gpiochip_swnode);
+ if (ret)
+ return dev_err_probe(priv->dev, ret,
+ "Failed to register gpio swnode\n");
+
+ ret = devm_add_action(priv->dev, cs42l43_release_sw_node, NULL);
+ if (ret) {
+ software_node_unregister(&cs42l43_gpiochip_swnode);
+ return ret;
+ }
+
+ ret = device_create_managed_software_node(&priv->ctlr->dev,
+ cs42l43_cs_props, NULL);
+ if (ret)
+ return dev_err_probe(priv->dev, ret, "Failed to add swnode\n");
+ } else {
+ device_set_node(&priv->ctlr->dev, fwnode);
+ }
ret = devm_spi_register_controller(priv->dev, priv->ctlr);
- if (ret) {
- dev_err(priv->dev, "Failed to register SPI controller: %d\n", ret);
+ if (ret)
+ return dev_err_probe(priv->dev, ret,
+ "Failed to register SPI controller\n");
+
+ if (has_sidecar) {
+ if (!spi_new_device(priv->ctlr, &l_info))
+ return dev_err_probe(priv->dev, -ENODEV,
+ "Failed to create left amp slave\n");
+
+ if (!spi_new_device(priv->ctlr, &r_info))
+ return dev_err_probe(priv->dev, -ENODEV,
+ "Failed to create right amp slave\n");
}
- return ret;
+ return 0;
}
static const struct platform_device_id cs42l43_spi_id_table[] = {
@@ -291,6 +405,7 @@ static struct platform_driver cs42l43_spi_driver = {
};
module_platform_driver(cs42l43_spi_driver);
+MODULE_IMPORT_NS(GPIO_SWNODE);
MODULE_DESCRIPTION("CS42L43 SPI Driver");
MODULE_AUTHOR("Lucas Tanure <tanureal@opensource.cirrus.com>");
MODULE_AUTHOR("Maciej Strozek <mstrozek@opensource.cirrus.com>");