dpll: zl3073x: Add low-level flash functions

JIRA: https://issues.redhat.com/browse/RHEL-115367

commit 3639bd0
Author: Ivan Vecera <ivecera@redhat.com>
Date:   Tue Sep 9 11:15:29 2025 +0200

    dpll: zl3073x: Add low-level flash functions

    To implement the devlink device flash functionality, the driver needs
    to access both the device memory and the internal flash memory. The flash
    memory is accessed using a device-specific program (called the flash
    utility). This flash utility must be downloaded by the driver into
    the device memory and then executed by the device CPU. Once running,
    the flash utility provides a flash API to access the flash memory itself.

    During this operation, the normal functionality provided by the standard
    firmware is not available. Therefore, the driver must ensure that DPLL
    callbacks and monitoring functions are not executed during the flash
    operation.

    Add all necessary functions for downloading the utility to device memory,
    entering and exiting flash mode, and performing flash operations.

    Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>
    Signed-off-by: Ivan Vecera <ivecera@redhat.com>
    Link: https://patch.msgid.link/20250909091532.11790-3-ivecera@redhat.com
    Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Signed-off-by: Ivan Vecera <ivecera@redhat.com>

Author: ivecera

drivers/dpll/zl3073x/Makefile

@@ -1,7 +1,7 @@
 # SPDX-License-Identifier: GPL-2.0
 
 obj-$(CONFIG_ZL3073X)		+= zl3073x.o
-zl3073x-objs			:= core.o devlink.o dpll.o prop.o
+zl3073x-objs			:= core.o devlink.o dpll.o flash.o prop.o
 
 obj-$(CONFIG_ZL3073X_I2C)	+= zl3073x_i2c.o
 zl3073x_i2c-objs		:= i2c.o

drivers/dpll/zl3073x/devlink.c

@@ -138,6 +138,15 @@ zl3073x_devlink_reload_up(struct devlink *devlink,
 	return 0;
 }
 
+void zl3073x_devlink_flash_notify(struct zl3073x_dev *zldev, const char *msg,
+				  const char *component, u32 done, u32 total)
+{
+	struct devlink *devlink = priv_to_devlink(zldev);
+
+	devlink_flash_update_status_notify(devlink, msg, component, done,
+					   total);
+}
+
 static const struct devlink_ops zl3073x_devlink_ops = {
 	.info_get = zl3073x_devlink_info_get,
 	.reload_actions = BIT(DEVLINK_RELOAD_ACTION_DRIVER_REINIT),

drivers/dpll/zl3073x/devlink.h

@@ -9,4 +9,7 @@ struct zl3073x_dev *zl3073x_devm_alloc(struct device *dev);
 
 int zl3073x_devlink_register(struct zl3073x_dev *zldev);
 
+void zl3073x_devlink_flash_notify(struct zl3073x_dev *zldev, const char *msg,
+				  const char *component, u32 done, u32 total);
+
 #endif /* _ZL3073X_DEVLINK_H */