video: Kbuild: detect x1p42100-videocc.h at build time

The dt-bindings header <dt-bindings/clock/qcom,x1p42100-videocc.h>
is present in qcom-specific kernel trees (qcom-6.18, qcom-next) but
is not yet available in linux-yocto based trees (yocto-6.18,
yocto-next).  A file-existence check cannot be replaced by a version
number because both kernel families share the same version.

Add a build-time probe in video/Kbuild that tests for the header
and, when found, passes -DMSM_VIDC_HAS_X1P42100_VIDEOCC=1 to compiler.

Guard the include of that header and the three clock-table entries
whose initialiser values (VIDEO_CC_MVS0C_CLK, VIDEO_CC_MVS0_CLK,
VIDEO_CC_MVS0_BSE_CLK) are defined exclusively by it with the same
macro.

Also guard the qcom,x1p42100-iris entry in msm_vidc_dt_match[] so
that the kernel does not associate the driver with the purwa device
at all on kernels where the header is absent.

Signed-off-by: Gourav Kumar <gouravk@qti.qualcomm.com>

Author: gouravk-qualcomm

driver/platform/purwa/src/purwa.c

@@ -4,7 +4,9 @@
  */
 
 #include <dt-bindings/clock/qcom,x1e80100-gcc.h>
+#ifdef MSM_VIDC_HAS_X1P42100_VIDEOCC
 #include <dt-bindings/clock/qcom,x1p42100-videocc.h>
+#endif
 #include <media/v4l2_vidc_extensions.h>
 
 #include "msm_vidc_purwa.h"
@@ -1809,11 +1811,13 @@ static const char * const purwa_opp_pd_table[] = { "mxc", "mmcx", NULL };
 /* name, clock id, scaling */
 static const struct clk_table purwa_clk_table[] = {
 	{ "iface",                    GCC_VIDEO_AXI0_CLK,      0},
+#ifdef MSM_VIDC_HAS_X1P42100_VIDEOCC
 	{ "core",                     VIDEO_CC_MVS0C_CLK,      0},
 	{ "vcodec0_core",             VIDEO_CC_MVS0_CLK,       1,
 	 (u64[]) {500000000, 424000000, 335000000, 300000000, 210000000}, 5},
 	{ "vcodec0_bse",              VIDEO_CC_MVS0_BSE_CLK,   1,
 	 (u64[]) {250000000, 212000000, 167500000, 150000000, 105000000}, 5},
+#endif
 };
 
 /* name */

driver/vidc/src/msm_vidc_probe.c

@@ -172,7 +172,9 @@ static const struct of_device_id msm_vidc_dt_match[] = {
 	{.compatible = "qcom,kera-vidc"},
 	{.compatible = "qcom,x1e80100-vidc"},
 	{.compatible = "qcom,x1e80100-iris"},
+#ifdef MSM_VIDC_HAS_X1P42100_VIDEOCC
 	{.compatible = "qcom,x1p42100-iris"},
+#endif
 	{.compatible = "qcom,sa8775p-iris"},
 	{.compatible = "qcom,qcs8300-iris"},
 	{.compatible = "qcom,sc7280-venus"},

video/Kbuild

@@ -1,5 +1,9 @@
 # SPDX-License-Identifier: GPL-2.0-only
 
+# KERNEL_SRC may not be set in all build environments; fall back to srctree
+# which is always defined by the kernel build system.
+KERNEL_SRC ?= $(srctree)
+
 VIDEO_DRIVER_ABS_PATH := $(VIDEO_ROOT)/video/driver
 VIDEO_DRIVER_REL_PATH := ../video/driver
 
@@ -9,6 +13,12 @@ ifeq ($(HAS_UBWC_HELPERS),yes)
   ccflags-y += -DMSM_VIDC_HAS_QCOM_UBWC_HELPERS=1
 endif
 
+X1P42100_VIDEOCC_H := $(KERNEL_SRC)/include/dt-bindings/clock/qcom,x1p42100-videocc.h
+HAS_X1P42100_VIDEOCC := $(shell test -f $(X1P42100_VIDEOCC_H) && echo yes || echo no)
+ifeq ($(HAS_X1P42100_VIDEOCC),yes)
+  ccflags-y += -DMSM_VIDC_HAS_X1P42100_VIDEOCC=1
+endif
+
 MDT_LOADER_H := $(KERNEL_SRC)/include/linux/soc/qcom/mdt_loader.h
 
 HAS_MDT_PAS_LOAD := $(shell grep -qs 'qcom_mdt_pas_load' $(MDT_LOADER_H) && echo yes || echo no)