[PATCH V9 0/4] dt: Add fdtoverlay rule and statically build unittest

[PATCH V9 0/4] dt: Add fdtoverlay rule and statically build unittest

[Viresh Kumar]

Hi,

This patchset adds a generic rule for applying overlays using fdtoverlay
tool and then updates unittests to get built statically using the same.

V8->V9:
- Added some comment in patch 3/4 based on Frank's suggestions.

V7->V8:
- Patch 1 is new.
- Platforms need to use dtb-y += foo.dtb instead of overlay-y +=
  foo.dtb.
- Use multi_depend instead of .SECONDEXPANSION.
- Use dtb-y for unittest instead of overlay-y.
- Rename the commented dtb filess in unittest Makefile as .dtbo.
- Improved Makefile code (I am learning a lot every day :)

V6->V7:
- Dropped the first 4 patches, already merged.
- Patch 1/3 is new, suggested by Rob and slightly modified by me.
- Adapt Patch 3/3 to the new rule and name the overlay dtbs as .dtbo.

--
Viresh

Rob Herring (1):
  kbuild: Add generic rule to apply fdtoverlay

Viresh Kumar (3):
  kbuild: Simplify builds with CONFIG_OF_ALL_DTBS
  of: unittest: Create overlay_common.dtsi and testcases_common.dtsi
  of: unittest: Statically apply overlays using fdtoverlay

 drivers/of/unittest-data/Makefile             | 50 ++++++++++
 drivers/of/unittest-data/overlay_base.dts     | 90 +-----------------
 drivers/of/unittest-data/overlay_common.dtsi  | 91 +++++++++++++++++++
 drivers/of/unittest-data/static_base_1.dts    |  4 +
 drivers/of/unittest-data/static_base_2.dts    |  4 +
 drivers/of/unittest-data/testcases.dts        | 23 ++---
 .../of/unittest-data/testcases_common.dtsi    | 19 ++++
 .../of/unittest-data/tests-interrupts.dtsi    | 11 +--
 scripts/Makefile.lib                          | 29 +++++-
 9 files changed, 210 insertions(+), 111 deletions(-)
 create mode 100644 drivers/of/unittest-data/overlay_common.dtsi
 create mode 100644 drivers/of/unittest-data/static_base_1.dts
 create mode 100644 drivers/of/unittest-data/static_base_2.dts
 create mode 100644 drivers/of/unittest-data/testcases_common.dtsi


base-commit: fe07bfda2fb9cdef8a4d4008a409bb02f35f1bd8
-- 
2.25.0.rc1.19.g042ed3e048af

[PATCH V9 1/4] kbuild: Simplify builds with CONFIG_OF_ALL_DTBS

[Viresh Kumar]

We update 'extra-y' based on CONFIG_OF_ALL_DTBS three times. It would be
far more straight forward if we rather update dtb-y to include all .dtb
files if CONFIG_OF_ALL_DTBS is enabled.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
---
 scripts/Makefile.lib | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
index eee59184de64..a2658242d956 100644
--- a/scripts/Makefile.lib
+++ b/scripts/Makefile.lib
@@ -73,14 +73,13 @@ always-y += $(userprogs-always-y) $(userprogs-always-m)
 
 # DTB
 # If CONFIG_OF_ALL_DTBS is enabled, all DT blobs are built
+dtb-$(CONFIG_OF_ALL_DTBS)       += $(dtb-)
+
 always-y			+= $(dtb-y)
-always-$(CONFIG_OF_ALL_DTBS)	+= $(dtb-)
 
 ifneq ($(CHECK_DTBS),)
 always-y += $(patsubst %.dtb,%.dt.yaml, $(dtb-y))
 always-y += $(patsubst %.dtbo,%.dt.yaml, $(dtb-y))
-always-$(CONFIG_OF_ALL_DTBS) += $(patsubst %.dtb,%.dt.yaml, $(dtb-))
-always-$(CONFIG_OF_ALL_DTBS) += $(patsubst %.dtbo,%.dt.yaml, $(dtb-))
 endif
 
 # Add subdir path
-- 
2.25.0.rc1.19.g042ed3e048af

[PATCH V9 2/4] kbuild: Add generic rule to apply fdtoverlay

[Viresh Kumar]

From: Rob Herring <robh@kernel.org>

Add a generic rule to apply fdtoverlay in Makefile.lib, so every
platform doesn't need to carry the complex rule.

The platform's Makefile only needs to have this now:

 DTC_FLAGS_foo_base += -@
 foo-dtbs := foo_base.dtb foo_overlay1.dtbo foo_overlay2.dtbo
 dtb-y := foo.dtb

We don't want to run schema checks on foo.dtb (as foo.dts doesn't exist)
and the Makefile is updated accordingly.

Signed-off-by: Rob Herring <robh@kernel.org>
Co-developed-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
---
 scripts/Makefile.lib | 24 ++++++++++++++++++++++--
 1 file changed, 22 insertions(+), 2 deletions(-)

diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
index a2658242d956..c430fbb36763 100644
--- a/scripts/Makefile.lib
+++ b/scripts/Makefile.lib
@@ -58,6 +58,10 @@ real-search = $(foreach m,$(1), $(if $(strip $(call suffix-search,$(m),$(2) -)),
 real-obj-y := $(call real-search, $(obj-y),-objs -y)
 real-obj-m := $(call real-search, $(obj-m),-objs -y -m)
 
+# List all dtbs to be generated by fdtoverlay
+overlay-y := $(foreach m,$(dtb-y), $(if $(strip $($(m:.dtb=-dtbs))),$(m),))
+overlay-$(CONFIG_OF_ALL_DTBS) += $(foreach m,$(dtb-), $(if $(strip $($(m:.dtb=-dtbs))),$(m),))
+
 always-y += $(always-m)
 
 # hostprogs-always-y += foo
@@ -72,14 +76,21 @@ userprogs += $(userprogs-always-y) $(userprogs-always-m)
 always-y += $(userprogs-always-y) $(userprogs-always-m)
 
 # DTB
+# Add base dtb and overlay dtbo
+dtb-y += $(foreach m,$(overlay-y), $($(m:.dtb=-dtbs)))
+
 # If CONFIG_OF_ALL_DTBS is enabled, all DT blobs are built
 dtb-$(CONFIG_OF_ALL_DTBS)       += $(dtb-)
 
 always-y			+= $(dtb-y)
 
 ifneq ($(CHECK_DTBS),)
-always-y += $(patsubst %.dtb,%.dt.yaml, $(dtb-y))
-always-y += $(patsubst %.dtbo,%.dt.yaml, $(dtb-y))
+# Don't run schema checks for dtbs created by fdtoverlay as they don't
+# have corresponding dts files.
+dt-yaml-y := $(filter-out $(overlay-y),$(dtb-y))
+
+always-y += $(patsubst %.dtb,%.dt.yaml, $(dt-yaml-y))
+always-y += $(patsubst %.dtbo,%.dt.yaml, $(dt-yaml-y))
 endif
 
 # Add subdir path
@@ -337,6 +348,15 @@ $(obj)/%.dtb: $(src)/%.dts $(DTC) FORCE
 $(obj)/%.dtbo: $(src)/%.dts $(DTC) FORCE
 	$(call if_changed_dep,dtc)
 
+overlay-y := $(addprefix $(obj)/, $(overlay-y))
+
+quiet_cmd_fdtoverlay = DTOVL   $@
+      cmd_fdtoverlay = $(objtree)/scripts/dtc/fdtoverlay -o $@ -i $(real-prereqs)
+
+$(overlay-y): FORCE
+	$(call if_changed,fdtoverlay)
+$(call multi_depend, $(overlay-y), .dtb, -dtbs)
+
 DT_CHECKER ?= dt-validate
 DT_BINDING_DIR := Documentation/devicetree/bindings
 # DT_TMP_SCHEMA may be overridden from Documentation/devicetree/bindings/Makefile
-- 
2.25.0.rc1.19.g042ed3e048af

[PATCH V9 3/4] of: unittest: Create overlay_common.dtsi and testcases_common.dtsi

[Viresh Kumar]

In order to build-test the same unit-test files using fdtoverlay tool,
move the device nodes from the existing overlay_base.dts and
testcases_common.dts files to .dtsi counterparts. The .dts files now
include the new .dtsi files, resulting in exactly the same behavior as
earlier.

The .dtsi files can now be reused for compile time tests using
fdtoverlay (will be done by a later commit).

This is required because the base files passed to fdtoverlay tool
shouldn't be overlays themselves (i.e. shouldn't have the /plugin/;
tag).

Note that this commit also moves "testcase-device2" node to
testcases.dts from tests-interrupts.dtsi, as this node has a deliberate
error in it and is only relevant for runtime testing done with
unittest.c.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
---
 drivers/of/unittest-data/overlay_base.dts     | 90 +-----------------
 drivers/of/unittest-data/overlay_common.dtsi  | 91 +++++++++++++++++++
 drivers/of/unittest-data/testcases.dts        | 23 ++---
 .../of/unittest-data/testcases_common.dtsi    | 19 ++++
 .../of/unittest-data/tests-interrupts.dtsi    | 11 +--
 5 files changed, 128 insertions(+), 106 deletions(-)
 create mode 100644 drivers/of/unittest-data/overlay_common.dtsi
 create mode 100644 drivers/of/unittest-data/testcases_common.dtsi

diff --git a/drivers/of/unittest-data/overlay_base.dts b/drivers/of/unittest-data/overlay_base.dts
index 99ab9d12d00b..ab9014589c5d 100644
--- a/drivers/of/unittest-data/overlay_base.dts
+++ b/drivers/of/unittest-data/overlay_base.dts
@@ -2,92 +2,4 @@
 /dts-v1/;
 /plugin/;
 
-/*
- * Base device tree that overlays will be applied against.
- *
- * Do not add any properties in node "/".
- * Do not add any nodes other than "/testcase-data-2" in node "/".
- * Do not add anything that would result in dtc creating node "/__fixups__".
- * dtc will create nodes "/__symbols__" and "/__local_fixups__".
- */
-
-/ {
-	testcase-data-2 {
-		#address-cells = <1>;
-		#size-cells = <1>;
-
-		electric_1: substation@100 {
-			compatible = "ot,big-volts-control";
-			reg = < 0x00000100 0x100 >;
-			status = "disabled";
-
-			hvac_1: hvac-medium-1 {
-				compatible = "ot,hvac-medium";
-				heat-range = < 50 75 >;
-				cool-range = < 60 80 >;
-			};
-
-			spin_ctrl_1: motor-1 {
-				compatible = "ot,ferris-wheel-motor";
-				spin = "clockwise";
-				rpm_avail = < 50 >;
-			};
-
-			spin_ctrl_2: motor-8 {
-				compatible = "ot,roller-coaster-motor";
-			};
-		};
-
-		rides_1: fairway-1 {
-			#address-cells = <1>;
-			#size-cells = <1>;
-			compatible = "ot,rides";
-			status = "disabled";
-			orientation = < 127 >;
-
-			ride@100 {
-				#address-cells = <1>;
-				#size-cells = <1>;
-				compatible = "ot,roller-coaster";
-				reg = < 0x00000100 0x100 >;
-				hvac-provider = < &hvac_1 >;
-				hvac-thermostat = < 29 > ;
-				hvac-zones = < 14 >;
-				hvac-zone-names = "operator";
-				spin-controller = < &spin_ctrl_2 5 &spin_ctrl_2 7 >;
-				spin-controller-names = "track_1", "track_2";
-				queues = < 2 >;
-
-				track@30 {
-					reg = < 0x00000030 0x10 >;
-				};
-
-				track@40 {
-					reg = < 0x00000040 0x10 >;
-				};
-
-			};
-		};
-
-		lights_1: lights@30000 {
-			compatible = "ot,work-lights";
-			reg = < 0x00030000 0x1000 >;
-			status = "disabled";
-		};
-
-		lights_2: lights@40000 {
-			compatible = "ot,show-lights";
-			reg = < 0x00040000 0x1000 >;
-			status = "disabled";
-			rate = < 13 138 >;
-		};
-
-		retail_1: vending@50000 {
-			reg = < 0x00050000 0x1000 >;
-			compatible = "ot,tickets";
-			status = "disabled";
-		};
-
-	};
-};
-
+#include "overlay_common.dtsi"
diff --git a/drivers/of/unittest-data/overlay_common.dtsi b/drivers/of/unittest-data/overlay_common.dtsi
new file mode 100644
index 000000000000..08874a72556e
--- /dev/null
+++ b/drivers/of/unittest-data/overlay_common.dtsi
@@ -0,0 +1,91 @@
+// SPDX-License-Identifier: GPL-2.0
+
+/*
+ * Base device tree that overlays will be applied against.
+ *
+ * Do not add any properties in node "/".
+ * Do not add any nodes other than "/testcase-data-2" in node "/".
+ * Do not add anything that would result in dtc creating node "/__fixups__".
+ * dtc will create nodes "/__symbols__" and "/__local_fixups__".
+ */
+
+/ {
+	testcase-data-2 {
+		#address-cells = <1>;
+		#size-cells = <1>;
+
+		electric_1: substation@100 {
+			compatible = "ot,big-volts-control";
+			reg = < 0x00000100 0x100 >;
+			status = "disabled";
+
+			hvac_1: hvac-medium-1 {
+				compatible = "ot,hvac-medium";
+				heat-range = < 50 75 >;
+				cool-range = < 60 80 >;
+			};
+
+			spin_ctrl_1: motor-1 {
+				compatible = "ot,ferris-wheel-motor";
+				spin = "clockwise";
+				rpm_avail = < 50 >;
+			};
+
+			spin_ctrl_2: motor-8 {
+				compatible = "ot,roller-coaster-motor";
+			};
+		};
+
+		rides_1: fairway-1 {
+			#address-cells = <1>;
+			#size-cells = <1>;
+			compatible = "ot,rides";
+			status = "disabled";
+			orientation = < 127 >;
+
+			ride@100 {
+				#address-cells = <1>;
+				#size-cells = <1>;
+				compatible = "ot,roller-coaster";
+				reg = < 0x00000100 0x100 >;
+				hvac-provider = < &hvac_1 >;
+				hvac-thermostat = < 29 > ;
+				hvac-zones = < 14 >;
+				hvac-zone-names = "operator";
+				spin-controller = < &spin_ctrl_2 5 &spin_ctrl_2 7 >;
+				spin-controller-names = "track_1", "track_2";
+				queues = < 2 >;
+
+				track@30 {
+					reg = < 0x00000030 0x10 >;
+				};
+
+				track@40 {
+					reg = < 0x00000040 0x10 >;
+				};
+
+			};
+		};
+
+		lights_1: lights@30000 {
+			compatible = "ot,work-lights";
+			reg = < 0x00030000 0x1000 >;
+			status = "disabled";
+		};
+
+		lights_2: lights@40000 {
+			compatible = "ot,show-lights";
+			reg = < 0x00040000 0x1000 >;
+			status = "disabled";
+			rate = < 13 138 >;
+		};
+
+		retail_1: vending@50000 {
+			reg = < 0x00050000 0x1000 >;
+			compatible = "ot,tickets";
+			status = "disabled";
+		};
+
+	};
+};
+
diff --git a/drivers/of/unittest-data/testcases.dts b/drivers/of/unittest-data/testcases.dts
index a85b5e1c381a..b80d6009ad7a 100644
--- a/drivers/of/unittest-data/testcases.dts
+++ b/drivers/of/unittest-data/testcases.dts
@@ -2,19 +2,20 @@
 /dts-v1/;
 /plugin/;
 
+#include "testcases_common.dtsi"
+
 / {
+        /*
+	 * testcase data that intentionally results in an error is located here
+	 * instead of in testcases_common.dtsi so that the static overlay apply
+	 * tests will not include the error.
+         */
 	testcase-data {
-		changeset {
-			prop-update = "hello";
-			prop-remove = "world";
-			node-remove {
-			};
+		testcase-device2 {
+			compatible = "testcase-device";
+			interrupt-parent = <&test_intc2>;
+			interrupts = <1>; /* invalid specifier - too short */
 		};
 	};
+
 };
-#include "tests-phandle.dtsi"
-#include "tests-interrupts.dtsi"
-#include "tests-match.dtsi"
-#include "tests-address.dtsi"
-#include "tests-platform.dtsi"
-#include "tests-overlay.dtsi"
diff --git a/drivers/of/unittest-data/testcases_common.dtsi b/drivers/of/unittest-data/testcases_common.dtsi
new file mode 100644
index 000000000000..19292bbb4cbb
--- /dev/null
+++ b/drivers/of/unittest-data/testcases_common.dtsi
@@ -0,0 +1,19 @@
+// SPDX-License-Identifier: GPL-2.0
+
+/ {
+	testcase-data {
+		changeset {
+			prop-update = "hello";
+			prop-remove = "world";
+			node-remove {
+			};
+		};
+	};
+};
+
+#include "tests-phandle.dtsi"
+#include "tests-interrupts.dtsi"
+#include "tests-match.dtsi"
+#include "tests-address.dtsi"
+#include "tests-platform.dtsi"
+#include "tests-overlay.dtsi"
diff --git a/drivers/of/unittest-data/tests-interrupts.dtsi b/drivers/of/unittest-data/tests-interrupts.dtsi
index ec175e800725..6c58fd61585c 100644
--- a/drivers/of/unittest-data/tests-interrupts.dtsi
+++ b/drivers/of/unittest-data/tests-interrupts.dtsi
@@ -62,11 +62,10 @@ testcase-device1 {
 			interrupts = <1>;
 		};
 
-		testcase-device2 {
-			compatible = "testcase-device";
-			interrupt-parent = <&test_intc2>;
-			interrupts = <1>; /* invalid specifier - too short */
-		};
+		/*
+		 * testcase data that intentionally results in an error is
+		 * located in testcases.dts instead of in this file so that the
+		 * static overlay apply tests will not include the error.
+                 */
 	};
-
 };
-- 
2.25.0.rc1.19.g042ed3e048af

[PATCH V9 4/4] of: unittest: Statically apply overlays using fdtoverlay

[Viresh Kumar]

Now that fdtoverlay is part of the kernel build, start using it to test
the unitest overlays we have by applying them statically. Create two new
base files static_base_1.dts and static_base_2.dts which includes other
.dtsi files.

Some unittest overlays deliberately contain errors that unittest checks
for. These overlays will cause fdtoverlay to fail, and are thus not
included for static builds.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
---
 drivers/of/unittest-data/Makefile          | 50 ++++++++++++++++++++++
 drivers/of/unittest-data/static_base_1.dts |  4 ++
 drivers/of/unittest-data/static_base_2.dts |  4 ++
 3 files changed, 58 insertions(+)
 create mode 100644 drivers/of/unittest-data/static_base_1.dts
 create mode 100644 drivers/of/unittest-data/static_base_2.dts

diff --git a/drivers/of/unittest-data/Makefile b/drivers/of/unittest-data/Makefile
index 009f4045c8e4..f88b2f48f172 100644
--- a/drivers/of/unittest-data/Makefile
+++ b/drivers/of/unittest-data/Makefile
@@ -34,7 +34,57 @@ DTC_FLAGS_overlay += -@
 DTC_FLAGS_overlay_bad_phandle += -@
 DTC_FLAGS_overlay_bad_symbol += -@
 DTC_FLAGS_overlay_base += -@
+DTC_FLAGS_static_base_1 += -@
+DTC_FLAGS_static_base_2 += -@
 DTC_FLAGS_testcases += -@
 
 # suppress warnings about intentional errors
 DTC_FLAGS_testcases += -Wno-interrupts_property
+
+# Apply overlays statically with fdtoverlay.  This is a build time test that
+# the overlays can be applied successfully by fdtoverlay.  This does not
+# guarantee that the overlays can be applied successfully at run time by
+# unittest, but it provides a bit of build time test coverage for those
+# who do not execute unittest.
+#
+# The overlays are applied on top of static_base_1.dtb and static_base_2.dtb to
+# create static_test_1.dtb and static_test_2.dtb.  If fdtoverlay detects an
+# error than the kernel build will fail.  static_test_1.dtb and
+# static_test_2.dtb are not consumed by unittest.
+#
+# Some unittest overlays deliberately contain errors that unittest checks for.
+# These overlays will cause fdtoverlay to fail, and are thus not included
+# in the static test:
+#			  overlay_bad_add_dup_node.dtbo \
+#			  overlay_bad_add_dup_prop.dtbo \
+#			  overlay_bad_phandle.dtbo \
+#			  overlay_bad_symbol.dtbo \
+
+apply_static_overlay_1 := overlay_0.dtbo \
+			  overlay_1.dtbo \
+			  overlay_2.dtbo \
+			  overlay_3.dtbo \
+			  overlay_4.dtbo \
+			  overlay_5.dtbo \
+			  overlay_6.dtbo \
+			  overlay_7.dtbo \
+			  overlay_8.dtbo \
+			  overlay_9.dtbo \
+			  overlay_10.dtbo \
+			  overlay_11.dtbo \
+			  overlay_12.dtbo \
+			  overlay_13.dtbo \
+			  overlay_15.dtbo \
+			  overlay_gpio_01.dtbo \
+			  overlay_gpio_02a.dtbo \
+			  overlay_gpio_02b.dtbo \
+			  overlay_gpio_03.dtbo \
+			  overlay_gpio_04a.dtbo \
+			  overlay_gpio_04b.dtbo
+
+apply_static_overlay_2 := overlay.dtbo
+
+static_test_1-dtbs := static_base_1.dtb $(apply_static_overlay_1)
+static_test_2-dtbs := static_base_2.dtb $(apply_static_overlay_2)
+
+dtb-$(CONFIG_OF_OVERLAY) += static_test_1.dtb static_test_2.dtb
diff --git a/drivers/of/unittest-data/static_base_1.dts b/drivers/of/unittest-data/static_base_1.dts
new file mode 100644
index 000000000000..10556cb3f01f
--- /dev/null
+++ b/drivers/of/unittest-data/static_base_1.dts
@@ -0,0 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+
+#include "testcases_common.dtsi"
diff --git a/drivers/of/unittest-data/static_base_2.dts b/drivers/of/unittest-data/static_base_2.dts
new file mode 100644
index 000000000000..b0ea9504d6f3
--- /dev/null
+++ b/drivers/of/unittest-data/static_base_2.dts
@@ -0,0 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+
+#include "overlay_common.dtsi"
-- 
2.25.0.rc1.19.g042ed3e048af

Re: [PATCH V9 2/4] kbuild: Add generic rule to apply fdtoverlay

[Geert Uytterhoeven]

Hi Viresh,

On Wed, Mar 3, 2021 at 5:36 AM Viresh Kumar <viresh.kumar@linaro.org> wrote:
> From: Rob Herring <robh@kernel.org>
>
> Add a generic rule to apply fdtoverlay in Makefile.lib, so every
> platform doesn't need to carry the complex rule.
>
> The platform's Makefile only needs to have this now:
>
>  DTC_FLAGS_foo_base += -@
>  foo-dtbs := foo_base.dtb foo_overlay1.dtbo foo_overlay2.dtbo
>  dtb-y := foo.dtb

Is there a way to autogenerate the DTC_FLAGS_foo_base rule, based on
the foo-dtbs rule?

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

Re: [PATCH V9 2/4] kbuild: Add generic rule to apply fdtoverlay

[Viresh Kumar]

On 03-03-21, 11:49, Geert Uytterhoeven wrote:
> Hi Viresh,
> 
> On Wed, Mar 3, 2021 at 5:36 AM Viresh Kumar <viresh.kumar@linaro.org> wrote:
> > From: Rob Herring <robh@kernel.org>
> >
> > Add a generic rule to apply fdtoverlay in Makefile.lib, so every
> > platform doesn't need to carry the complex rule.
> >
> > The platform's Makefile only needs to have this now:
> >
> >  DTC_FLAGS_foo_base += -@
> >  foo-dtbs := foo_base.dtb foo_overlay1.dtbo foo_overlay2.dtbo
> >  dtb-y := foo.dtb
> 
> Is there a way to autogenerate the DTC_FLAGS_foo_base rule, based on
> the foo-dtbs rule?

Since the first entry in "foo-dtbs" is always going to be the only
base file, maybe we can do that.

-- 
viresh

Re: [PATCH V9 1/4] kbuild: Simplify builds with CONFIG_OF_ALL_DTBS

[Masahiro Yamada]

On Wed, Mar 3, 2021 at 1:36 PM Viresh Kumar <viresh.kumar@linaro.org> wrote:
>
> We update 'extra-y' based on CONFIG_OF_ALL_DTBS three times. It would be
> far more straight forward if we rather update dtb-y to include all .dtb
> files if CONFIG_OF_ALL_DTBS is enabled.
>
> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>

Acked-by: Masahiro Yamada <masahiroy@kernel.org>


> ---
>  scripts/Makefile.lib | 5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)
>
> diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
> index eee59184de64..a2658242d956 100644
> --- a/scripts/Makefile.lib
> +++ b/scripts/Makefile.lib
> @@ -73,14 +73,13 @@ always-y += $(userprogs-always-y) $(userprogs-always-m)
>
>  # DTB
>  # If CONFIG_OF_ALL_DTBS is enabled, all DT blobs are built
> +dtb-$(CONFIG_OF_ALL_DTBS)       += $(dtb-)
> +
>  always-y                       += $(dtb-y)
> -always-$(CONFIG_OF_ALL_DTBS)   += $(dtb-)
>
>  ifneq ($(CHECK_DTBS),)
>  always-y += $(patsubst %.dtb,%.dt.yaml, $(dtb-y))
>  always-y += $(patsubst %.dtbo,%.dt.yaml, $(dtb-y))
> -always-$(CONFIG_OF_ALL_DTBS) += $(patsubst %.dtb,%.dt.yaml, $(dtb-))
> -always-$(CONFIG_OF_ALL_DTBS) += $(patsubst %.dtbo,%.dt.yaml, $(dtb-))
>  endif
>
>  # Add subdir path
> --
> 2.25.0.rc1.19.g042ed3e048af
>


-- 
Best Regards
Masahiro Yamada

Re: [PATCH V9 2/4] kbuild: Add generic rule to apply fdtoverlay

[Masahiro Yamada]

On Wed, Mar 3, 2021 at 1:36 PM Viresh Kumar <viresh.kumar@linaro.org> wrote:
>
> From: Rob Herring <robh@kernel.org>
>
> Add a generic rule to apply fdtoverlay in Makefile.lib, so every
> platform doesn't need to carry the complex rule.
>
> The platform's Makefile only needs to have this now:
>
>  DTC_FLAGS_foo_base += -@
>  foo-dtbs := foo_base.dtb foo_overlay1.dtbo foo_overlay2.dtbo
>  dtb-y := foo.dtb
>
> We don't want to run schema checks on foo.dtb (as foo.dts doesn't exist)
> and the Makefile is updated accordingly.
>
> Signed-off-by: Rob Herring <robh@kernel.org>
> Co-developed-by: Viresh Kumar <viresh.kumar@linaro.org>
> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
> ---
>  scripts/Makefile.lib | 24 ++++++++++++++++++++++--
>  1 file changed, 22 insertions(+), 2 deletions(-)
>
> diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
> index a2658242d956..c430fbb36763 100644
> --- a/scripts/Makefile.lib
> +++ b/scripts/Makefile.lib
> @@ -58,6 +58,10 @@ real-search = $(foreach m,$(1), $(if $(strip $(call suffix-search,$(m),$(2) -)),
>  real-obj-y := $(call real-search, $(obj-y),-objs -y)
>  real-obj-m := $(call real-search, $(obj-m),-objs -y -m)
>
> +# List all dtbs to be generated by fdtoverlay
> +overlay-y := $(foreach m,$(dtb-y), $(if $(strip $($(m:.dtb=-dtbs))),$(m),))
> +overlay-$(CONFIG_OF_ALL_DTBS) += $(foreach m,$(dtb-), $(if $(strip $($(m:.dtb=-dtbs))),$(m),))

This does not benefit from 1/4.


Squashing the following will shorten the code.

diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
index e12633f4057d..44a1652ddcd7 100644
--- a/scripts/Makefile.lib
+++ b/scripts/Makefile.lib
@@ -58,10 +58,6 @@ real-search = $(foreach m,$(1), $(if $(strip $(call
suffix-search,$(m),$(2) -)),
 real-obj-y := $(call real-search, $(obj-y),-objs -y)
 real-obj-m := $(call real-search, $(obj-m),-objs -y -m)

-# List all dtbs to be generated by fdtoverlay
-overlay-y := $(foreach m,$(dtb-y), $(if $(strip $($(m:.dtb=-dtbs))),$(m),))
-overlay-$(CONFIG_OF_ALL_DTBS) += $(foreach m,$(dtb-), $(if $(strip
$($(m:.dtb=-dtbs))),$(m),))
-
 always-y += $(always-m)

 # hostprogs-always-y += foo
@@ -75,13 +71,16 @@ always-y += $(hostprogs-always-y) $(hostprogs-always-m)
 userprogs += $(userprogs-always-y) $(userprogs-always-m)
 always-y += $(userprogs-always-y) $(userprogs-always-m)

+# If CONFIG_OF_ALL_DTBS is enabled, all DT blobs are built
+dtb-$(CONFIG_OF_ALL_DTBS)       += $(dtb-)
+
+# List all dtbs to be generated by fdtoverlay
+overlay-y := $(foreach m,$(dtb-y), $(if $(strip $($(m:.dtb=-dtbs))),$(m),))
+
 # DTB
 # Add base dtb and overlay dtbo
 dtb-y += $(foreach m,$(overlay-y), $($(m:.dtb=-dtbs)))

-# If CONFIG_OF_ALL_DTBS is enabled, all DT blobs are built
-dtb-$(CONFIG_OF_ALL_DTBS)       += $(dtb-)
-
 always-y                       += $(dtb-y)

 ifneq ($(CHECK_DTBS),)



-- 
Best Regards
Masahiro Yamada