drivers: pwm: Fix build for Linux v6.8

Commit 54c86dd20bba ("pwm: Replace PWM chip unique base by unique ID")
removed the 'base' field of the 'pwm_chip' structure replacing it with
an 'id' field. The new 'id' is initialised by the PWM driver core and
does not need to be configured by the PWM drivers.

Add a test for conftest to detect if the 'pwm_chip' structure has the
'base' field and update the various PWM driver to only set this field if
present.

Bug 4448428

Change-Id: I7cf466eddba4aedb57db84534e3cbf99be64151e
Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/3027486
Reviewed-by: Laxman Dewangan <ldewangan@nvidia.com>
GVS: Gerrit_Virtual_Submit <buildbot_gerritrpt@nvidia.com>

drivers/media/platform/tegra/cdi/cdi_pwm.c

@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: GPL-2.0
-// Copyright (c) 2016-2023, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+// Copyright (c) 2016-2024, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
 
 #include <nvidia/conftest.h>
 
@@ -162,7 +162,9 @@ static int cdi_pwm_probe(struct platform_device *pdev)
 
 	info->chip.dev = &pdev->dev;
 	info->chip.ops = &cdi_pwm_ops;
+#if defined(NV_PWM_CHIP_STRUCT_HAS_BASE_ARG)
 	info->chip.base = -1;
+#endif
 	info->chip.npwm = npwm;
 	info->chip.of_xlate = of_cdi_pwm_xlate;
 	info->chip.of_pwm_n_cells = 2;

drivers/media/platform/tegra/isc/isc_pwm.c

@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: GPL-2.0
-// Copyright (c) 2016-2023, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+// Copyright (c) 2016-2024, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
 
 #include <nvidia/conftest.h>
 
@@ -162,7 +162,9 @@ static int isc_pwm_probe(struct platform_device *pdev)
 
 	info->chip.dev = &pdev->dev;
 	info->chip.ops = &isc_pwm_ops;
+#if defined(NV_PWM_CHIP_STRUCT_HAS_BASE_ARG)
 	info->chip.base = -1;
+#endif
 	info->chip.npwm = npwm;
 	info->chip.of_xlate = of_isc_pwm_xlate;
 	info->chip.of_pwm_n_cells = 2;

drivers/pwm/pwm-tegra-tachometer.c

@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: GPL-2.0
-// Copyright (c) 2022-2023, NVIDIA CORPORATION.  All rights reserved.
+// Copyright (c) 2022-2024, NVIDIA CORPORATION.  All rights reserved.
 
 #include <nvidia/conftest.h>
 
@@ -429,7 +429,9 @@ static int pwm_tegra_tach_probe(struct platform_device *pdev)
 
 	ptt->chip.dev = &pdev->dev;
 	ptt->chip.ops = &pwm_tegra_tach_ops;
+#if defined(NV_PWM_CHIP_STRUCT_HAS_BASE_ARG)
 	ptt->chip.base = -1;
+#endif
 	ptt->chip.npwm = 1;
 
 	ret = pwmchip_add(&ptt->chip);

scripts/conftest/Makefile

@@ -135,6 +135,7 @@ NV_CONFTEST_FUNCTION_COMPILE_TESTS += of_get_named_gpio_flags
 NV_CONFTEST_FUNCTION_COMPILE_TESTS += gpio_chip_struct_has_of_node_present
 NV_CONFTEST_FUNCTION_COMPILE_TESTS += gpiochip_find
 NV_CONFTEST_FUNCTION_COMPILE_TESTS += pde_data
+NV_CONFTEST_FUNCTION_COMPILE_TESTS += pwm_chip_struct_has_base_arg
 NV_CONFTEST_FUNCTION_COMPILE_TESTS += pwm_ops_struct_has_owner
 NV_CONFTEST_FUNCTION_COMPILE_TESTS += pwm_ops_struct_has_config
 NV_CONFTEST_FUNCTION_COMPILE_TESTS += pci_epc_event_ops_struct_has_core_deinit

scripts/conftest/conftest.sh

@@ -7163,6 +7163,23 @@ compile_test() {
             compile_check_conftest "$CODE" "NV_MII_BUS_STRUCT_HAS_WRITE_C45" "" "types"
         ;;
 
+        pwm_chip_struct_has_base_arg)
+            #
+            # Determine if 'struct pwm_chip' has the 'base' field.
+            #
+            # Commit 54c86dd20bba ("pwm: Replace PWM chip unique base by unique ID")
+            # removed the 'base' field of the 'pwm_chip' structure replacing it with
+            # an 'id' field.
+            #
+            CODE="
+            #include <sound/soc.h>
+            int conftest_pwm_chip_struct_has_base_arg(void) {
+                return offsetof(struct pwm_chip, base);
+            }"
+
+            compile_check_conftest "$CODE" "NV_PWM_CHIP_STRUCT_HAS_BASE_ARG" "" "types"
+        ;;
+
         pwm_ops_struct_has_owner)
             #
             # Determine if the pwm_ops struct has an owner member.