Merge tag 'asoc-v6.19' of https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound into for-linus

ASoC: Updates for v6.19

This is a very large set of updates, as well as some more extensive
cleanup work from Morimto-san we've also added a generic SCDA class
driver for SoundWire devices enabling us to support many chips with
no custom code.  There's also a batch of new drivers added for both
SoCs and CODECs.

 - Added a SoundWire SCDA generic class driver, pulling in a little
   regmap work to support it.
 - A *lot* of cleaup and API improvement work from Morimoto-san.
 - Lots of work on the existing Cirrus, Intel, Maxim and Qualcomm
   drivers.
 - Support for Allwinner A523, Mediatek MT8189, Qualcomm QCM2290,
   QRB2210 and SM6115, SpacemiT K1, and TI TAS2568, TAS5802, TAS5806,
   TAS5815, TAS5828 and TAS5830.

This also pulls in some gpiolib changes supporting shared GPIOs in the
core there so we can convert some of the ASoC drivers open coding
handling of that to the core functionality.

1 files changed, 61 insertions, 9 deletions

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index cd8800ba5825..476fcc897d90 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -37,6 +37,7 @@
 #include "gpiolib-acpi.h"
 #include "gpiolib-cdev.h"
 #include "gpiolib-of.h"
+#include "gpiolib-shared.h"
 #include "gpiolib-swnode.h"
 #include "gpiolib-sysfs.h"
 #include "gpiolib.h"
@@ -1200,6 +1201,10 @@ int gpiochip_add_data_with_key(struct gpio_chip *gc, void *data,
 	if (ret)
 		goto err_remove_irqchip_mask;
 
+	ret = gpio_device_setup_shared(gdev);
+	if (ret)
+		goto err_remove_irqchip;
+
 	/*
 	 * By first adding the chardev, and then adding the device,
 	 * we get a device node entry in sysfs under
@@ -1211,10 +1216,13 @@ int gpiochip_add_data_with_key(struct gpio_chip *gc, void *data,
 	if (gpiolib_initialized) {
 		ret = gpiochip_setup_dev(gdev);
 		if (ret)
-			goto err_remove_irqchip;
+			goto err_teardown_shared;
 	}
+
 	return 0;
 
+err_teardown_shared:
+	gpio_device_teardown_shared(gdev);
 err_remove_irqchip:
 	gpiochip_irqchip_remove(gc);
 err_remove_irqchip_mask:
@@ -1283,6 +1291,7 @@ void gpiochip_remove(struct gpio_chip *gc)
 	/* Numb the device, cancelling all outstanding operations */
 	rcu_assign_pointer(gdev->chip, NULL);
 	synchronize_srcu(&gdev->srcu);
+	gpio_device_teardown_shared(gdev);
 	gpiochip_irqchip_remove(gc);
 	acpi_gpiochip_remove(gc);
 	of_gpiochip_remove(gc);
@@ -3982,6 +3991,26 @@ int gpiod_set_consumer_name(struct gpio_desc *desc, const char *name)
 EXPORT_SYMBOL_GPL(gpiod_set_consumer_name);
 
 /**
+ * gpiod_is_shared() - check if this GPIO can be shared by multiple consumers
+ * @desc: GPIO to inspect
+ *
+ * Returns:
+ * True if this GPIO can be shared by multiple consumers at once. False if it's
+ * a regular, exclusive GPIO.
+ *
+ * Note:
+ * This function returning true does not mean that this GPIO is currently being
+ * shared. It means the GPIO core has registered the fact that the firmware
+ * configuration indicates that it can be shared by multiple consumers and is
+ * in charge of arbitrating the access.
+ */
+bool gpiod_is_shared(const struct gpio_desc *desc)
+{
+	return test_bit(GPIOD_FLAG_SHARED_PROXY, &desc->flags);
+}
+EXPORT_SYMBOL_GPL(gpiod_is_shared);
+
+/**
  * gpiod_to_irq() - return the IRQ corresponding to a GPIO
  * @desc: gpio whose IRQ will be returned (already requested)
  *
@@ -4652,11 +4681,29 @@ struct gpio_desc *gpiod_find_and_request(struct device *consumer,
 	scoped_guard(srcu, &gpio_devices_srcu) {
 		desc = gpiod_fwnode_lookup(fwnode, consumer, con_id, idx,
 					   &flags, &lookupflags);
+		if (!IS_ERR_OR_NULL(desc) &&
+		    test_bit(GPIOD_FLAG_SHARED, &desc->flags)) {
+			/*
+			 * We're dealing with a GPIO shared by multiple
+			 * consumers. This is the moment to add the machine
+			 * lookup table for the proxy device as previously
+			 * we only knew the consumer's fwnode.
+			 */
+			ret = gpio_shared_add_proxy_lookup(consumer, lookupflags);
+			if (ret)
+				return ERR_PTR(ret);
+
+			/* Trigger platform lookup for shared GPIO proxy. */
+			desc = ERR_PTR(-ENOENT);
+			/* Trigger it even for fwnode-only gpiod_get(). */
+			platform_lookup_allowed = true;
+		}
+
 		if (gpiod_not_found(desc) && platform_lookup_allowed) {
 			/*
 			 * Either we are not using DT or ACPI, or their lookup
-			 * did not return a result. In that case, use platform
-			 * lookup as a fallback.
+			 * did not return a result or this is a shared GPIO. In
+			 * that case, use platform lookup as a fallback.
 			 */
 			dev_dbg(consumer,
 				"using lookup tables for GPIO lookup\n");
@@ -4679,14 +4726,19 @@ struct gpio_desc *gpiod_find_and_request(struct device *consumer,
 			return ERR_PTR(ret);
 
 		/*
-		 * This happens when there are several consumers for
-		 * the same GPIO line: we just return here without
-		 * further initialization. It is a bit of a hack.
-		 * This is necessary to support fixed regulators.
+		 * This happens when there are several consumers for the same
+		 * GPIO line: we just return here without further
+		 * initialization. It's a hack introduced long ago to support
+		 * fixed regulators. We now have a better solution with
+		 * automated scanning where affected platforms just need to
+		 * select the provided Kconfig option.
 		 *
-		 * FIXME: Make this more sane and safe.
+		 * FIXME: Remove the GPIOD_FLAGS_BIT_NONEXCLUSIVE flag after
+		 * making sure all platforms use the new mechanism.
 		 */
-		dev_info(consumer, "nonexclusive access to GPIO for %s\n", name);
+		dev_info(consumer,
+			 "nonexclusive access to GPIO for %s, consider updating your code to using gpio-shared-proxy\n",
+			 name);
 		return desc;
 	}