* Re: [PATCH] docs: ipmb: place it at driver-api and convert to ReST
From: Corey Minyard @ 2019-07-01 0:34 UTC (permalink / raw)
To: Mauro Carvalho Chehab
Cc: Linux Doc Mailing List, Mauro Carvalho Chehab, linux-kernel,
Jonathan Corbet, Greg Kroah-Hartman, Randy Dunlap,
Rafael J. Wysocki, Logan Gunthorpe, Asmaa Mnebhi, vadimp
In-Reply-To: <d23c36ca65fe6ad56af1723bf70f7a7f4154c410.1561804596.git.mchehab+samsung@kernel.org>
On Sat, Jun 29, 2019 at 07:36:46AM -0300, Mauro Carvalho Chehab wrote:
> No new doc should be added at the main Documentation/ directory.
>
> Instead, new docs should be added as ReST files, within the
> Kernel documentation body.
Got it, thanks.
-corey
>
> Fixes: 51bd6f291583 ("Add support for IPMB driver")
> Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
> ---
> Documentation/driver-api/index.rst | 1 +
> .../{IPMB.txt => driver-api/ipmb.rst} | 62 ++++++++++---------
> 2 files changed, 33 insertions(+), 30 deletions(-)
> rename Documentation/{IPMB.txt => driver-api/ipmb.rst} (71%)
>
> diff --git a/Documentation/driver-api/index.rst b/Documentation/driver-api/index.rst
> index e33849b948c7..e49c34bf16c0 100644
> --- a/Documentation/driver-api/index.rst
> +++ b/Documentation/driver-api/index.rst
> @@ -75,6 +75,7 @@ available subsections can be seen below.
> dell_rbu
> edid
> eisa
> + ipmb
> isa
> isapnp
> generic-counter
> diff --git a/Documentation/IPMB.txt b/Documentation/driver-api/ipmb.rst
> similarity index 71%
> rename from Documentation/IPMB.txt
> rename to Documentation/driver-api/ipmb.rst
> index cd20c9764705..3ec3baed84c4 100644
> --- a/Documentation/IPMB.txt
> +++ b/Documentation/driver-api/ipmb.rst
> @@ -32,11 +32,11 @@ This driver works with the I2C driver and a userspace
> program such as OpenIPMI:
>
> 1) It is an I2C slave backend driver. So, it defines a callback
> -function to set the Satellite MC as an I2C slave.
> -This callback function handles the received IPMI requests.
> + function to set the Satellite MC as an I2C slave.
> + This callback function handles the received IPMI requests.
>
> 2) It defines the read and write functions to enable a user
> -space program (such as OpenIPMI) to communicate with the kernel.
> + space program (such as OpenIPMI) to communicate with the kernel.
>
>
> Load the IPMB driver
> @@ -48,34 +48,35 @@ CONFIG_IPMB_DEVICE_INTERFACE=y
>
> 1) If you want the driver to be loaded at boot time:
>
> -a) Add this entry to your ACPI table, under the appropriate SMBus:
> +a) Add this entry to your ACPI table, under the appropriate SMBus::
>
> -Device (SMB0) // Example SMBus host controller
> -{
> - Name (_HID, "<Vendor-Specific HID>") // Vendor-Specific HID
> - Name (_UID, 0) // Unique ID of particular host controller
> - :
> - :
> - Device (IPMB)
> - {
> - Name (_HID, "IPMB0001") // IPMB device interface
> - Name (_UID, 0) // Unique device identifier
> - }
> -}
> + Device (SMB0) // Example SMBus host controller
> + {
> + Name (_HID, "<Vendor-Specific HID>") // Vendor-Specific HID
> + Name (_UID, 0) // Unique ID of particular host controller
> + :
> + :
> + Device (IPMB)
> + {
> + Name (_HID, "IPMB0001") // IPMB device interface
> + Name (_UID, 0) // Unique device identifier
> + }
> + }
>
> -b) Example for device tree:
> +b) Example for device tree::
>
> -&i2c2 {
> - status = "okay";
> + &i2c2 {
> + status = "okay";
>
> - ipmb@10 {
> - compatible = "ipmb-dev";
> - reg = <0x10>;
> - };
> -};
> + ipmb@10 {
> + compatible = "ipmb-dev";
> + reg = <0x10>;
> + };
> + };
>
> -2) Manually from Linux:
> -modprobe ipmb-dev-int
> +2) Manually from Linux::
> +
> + modprobe ipmb-dev-int
>
>
> Instantiate the device
> @@ -86,15 +87,16 @@ described in 'Documentation/i2c/instantiating-devices.rst'.
> If you have multiple BMCs, each connected to your Satellite MC via
> a different I2C bus, you can instantiate a device for each of
> those BMCs.
> +
> The name of the instantiated device contains the I2C bus number
> -associated with it as follows:
> +associated with it as follows::
>
> -BMC1 ------ IPMB/I2C bus 1 ---------| /dev/ipmb-1
> + BMC1 ------ IPMB/I2C bus 1 ---------| /dev/ipmb-1
> Satellite MC
> -BMC1 ------ IPMB/I2C bus 2 ---------| /dev/ipmb-2
> + BMC1 ------ IPMB/I2C bus 2 ---------| /dev/ipmb-2
>
> For instance, you can instantiate the ipmb-dev-int device from
> -user space at the 7 bit address 0x10 on bus 2:
> +user space at the 7 bit address 0x10 on bus 2::
>
> # echo ipmb-dev 0x1010 > /sys/bus/i2c/devices/i2c-2/new_device
>
> --
> 2.21.0
>
^ permalink raw reply
* [PATCH 4/7] kbuild: support header-test-pattern-y
From: Masahiro Yamada @ 2019-07-01 0:58 UTC (permalink / raw)
To: linux-kbuild
Cc: Sam Ravnborg, Joel Fernandes, Masahiro Yamada, linux-doc,
linux-kernel, Jonathan Corbet, Michal Marek
In-Reply-To: <20190701005845.12475-1-yamada.masahiro@socionext.com>
In my view, most of headers can be self-contained. So, it would be
tedious to add every header to header-test-y explicitly. We usually
end up with "all headers with some exceptions".
There are two types in exceptions:
[1] headers that are never compiled as standalone units
For examples, include/linux/compiler-gcc.h is not intended for
direct inclusion. We should always exclude such ones.
[2] headers that are conditionally compiled as standalone units
Some headers can be compiled only for particular architectures.
For example, include/linux/arm-cci.h can be compiled only for
arm/arm64 because it requires <asm/arm-cci.h> to exist.
Clang can compile include/soc/nps/mtm.h only for arc because
it contains an arch-specific register in inline assembler.
So, you can write Makefile like this:
header-test- += linux/compiler-gcc.h
header-test-$(CONFIG_ARM) += linux/arm-cci.h
header-test-$(CONFIG_ARM64) += linux/arm-cci.h
header-test-$(CONFIG_ARC) += soc/nps/mtm.h
The new syntax header-test-pattern-y will be useful to specify
"the rest".
The typical usage is like this:
header-test-pattern-y += */*.h
This will add all the headers in sub-directories to the test coverage,
excluding $(header-test-). In this regards, header-test-pattern-y
behaves like a weaker variant of header-test-y.
Caveat:
The patterns in header-test-pattern-y are prefixed with $(srctree)/$(src)/
but not $(objtree)/$(obj)/. Stale generated headers are often left over
when you traverse the git history without cleaning. Wildcard patterns for
$(objtree) may match to stale headers, which could fail to compile.
One pitfall is $(srctree)/$(src)/ and $(objtree)/$(obj)/ point to the
same directory for in-tree building. So, header-test-pattern-y should
be used with care since it can potentially match to stale headers.
Caveat2:
You could use wildcard for header-test-. For example,
header-test- += asm-generic/%
... will exclude headers in asm-generic directory. Unfortunately, the
wildcard character is '%' instead of '*' here because this is evaluated
by $(filter-out ...) whereas header-test-pattern-y is evaluated by
$(wildcard ...). This is a kludge, but seems useful in some places...
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Tested-by: Jani Nikula <jani.nikula@intel.com>
---
Changes in v4: None
Changes in v3: None
Changes in v2:
- New patch
Documentation/kbuild/makefiles.txt | 10 ++++++++++
scripts/Makefile.lib | 11 +++++++++++
2 files changed, 21 insertions(+)
diff --git a/Documentation/kbuild/makefiles.txt b/Documentation/kbuild/makefiles.txt
index 5080fec34609..b817e6cefb77 100644
--- a/Documentation/kbuild/makefiles.txt
+++ b/Documentation/kbuild/makefiles.txt
@@ -1025,6 +1025,16 @@ When kbuild executes, the following steps are followed (roughly):
i.e. compilable as standalone units. If CONFIG_HEADER_TEST is enabled,
this builds them as part of extra-y.
+ header-test-pattern-y
+
+ This works as a weaker version of header-test-y, and accepts wildcard
+ patterns. The typical usage is:
+
+ header-test-pattern-y += *.h
+
+ This specifies all the files that matches to '*.h' in the current
+ directory, but the files in 'header-test-' are excluded.
+
--- 6.7 Commands useful for building a boot image
Kbuild provides a few macros that are useful when building a
diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
index 55ae1ec65342..281864fcf0fe 100644
--- a/scripts/Makefile.lib
+++ b/scripts/Makefile.lib
@@ -67,6 +67,17 @@ extra-$(CONFIG_OF_ALL_DTBS) += $(patsubst %.dtb,%.dt.yaml, $(dtb-))
endif
# Test self-contained headers
+
+# Wildcard searches in $(srctree)/$(src)/, but not in $(objtree)/$(obj)/.
+# Stale generated headers are often left over, so pattern matching should
+# be avoided. Please notice $(srctree)/$(src)/ and $(objtree)/$(obj) point
+# to the same location for in-tree building. So, header-test-pattern-y should
+# be used with care.
+header-test-y += $(filter-out $(header-test-), \
+ $(patsubst $(srctree)/$(src)/%, %, \
+ $(wildcard $(addprefix $(srctree)/$(src)/, \
+ $(header-test-pattern-y)))))
+
extra-$(CONFIG_HEADER_TEST) += $(addsuffix .s, $(header-test-y))
# Add subdir path
--
2.17.1
^ permalink raw reply related
* [PATCH 3/7] kbuild: do not create wrappers for header-test-y
From: Masahiro Yamada @ 2019-07-01 0:58 UTC (permalink / raw)
To: linux-kbuild
Cc: Sam Ravnborg, Joel Fernandes, Masahiro Yamada, linux-doc,
Jonathan Corbet, linux-kernel, Michal Marek
In-Reply-To: <20190701005845.12475-1-yamada.masahiro@socionext.com>
header-test-y does not work with headers in sub-directories.
For example, you may want to write a Makefile, like this:
include/linux/Kbuild:
header-test-y += mtd/nand.h
This entry will create a wrapper include/linux/mtd/nand.hdrtest.c
with the following content:
#include "mtd/nand.h"
To make this work, we need to add $(srctree)/include/linux to the
header search path. It would be tedious to add ccflags-y.
Instead, we could change the *.hdrtest.c rule to wrap:
#include "nand.h"
This works for in-tree build since #include "..." searches in the
relative path from the header with this directive. For O=... build,
we need to add $(srctree)/include/linux/mtd to the header search path,
which will be even more tedious.
After all, I thought it would be handier to compile headers directly
without creating wrappers.
I added a new build rule to compile %.h into %.h.s
The target is %.h.s instead of %.h.o because it is slightly faster.
Also, as for GCC, an empty assembly is smaller than an empty object.
I wrote the build rule:
$(CC) $(c_flags) -S -o $@ -x c /dev/null -include $<
instead of:
$(CC) $(c_flags) -S -o $@ -x c $<
Both work fine with GCC, but the latter is bad for Clang.
This comes down to the difference in the -Wunused-function policy.
GCC does not warn about unused 'static inline' functions at all.
Clang does not warn about the ones in included headers, but does
about the ones in the source. So, we should handle headers as
headers, not as source files.
In fact, this has been hidden since commit abb2ea7dfd82 ("compiler,
clang: suppress warning for unused static inline functions"), but we
should not rely on that.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: Jani Nikula <jani.nikula@intel.com>
Tested-by: Jani Nikula <jani.nikula@intel.com>
---
Changes in v4: None
Changes in v3: None
Changes in v2:
- New patch
.gitignore | 1 -
Documentation/dontdiff | 1 -
Documentation/kbuild/makefiles.txt | 3 +--
Makefile | 1 -
scripts/Makefile.build | 10 +++++-----
scripts/Makefile.lib | 2 +-
6 files changed, 7 insertions(+), 11 deletions(-)
diff --git a/.gitignore b/.gitignore
index 4bb60f0fa23b..7587ef56b92d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -22,7 +22,6 @@
*.elf
*.gcno
*.gz
-*.hdrtest.c
*.i
*.ko
*.lex.c
diff --git a/Documentation/dontdiff b/Documentation/dontdiff
index 554dfe4883d2..5eba889ea84d 100644
--- a/Documentation/dontdiff
+++ b/Documentation/dontdiff
@@ -19,7 +19,6 @@
*.grep
*.grp
*.gz
-*.hdrtest.c
*.html
*.i
*.jpeg
diff --git a/Documentation/kbuild/makefiles.txt b/Documentation/kbuild/makefiles.txt
index ca4b24ec0399..5080fec34609 100644
--- a/Documentation/kbuild/makefiles.txt
+++ b/Documentation/kbuild/makefiles.txt
@@ -1023,8 +1023,7 @@ When kbuild executes, the following steps are followed (roughly):
header-test-y specifies headers (*.h) in the current directory that
should be compile tested to ensure they are self-contained,
i.e. compilable as standalone units. If CONFIG_HEADER_TEST is enabled,
- this autogenerates dummy sources to include the headers, and builds them
- as part of extra-y.
+ this builds them as part of extra-y.
--- 6.7 Commands useful for building a boot image
diff --git a/Makefile b/Makefile
index f23516980796..7f293b0431fe 100644
--- a/Makefile
+++ b/Makefile
@@ -1648,7 +1648,6 @@ clean: $(clean-dirs)
-o -name '*.dwo' -o -name '*.lst' \
-o -name '*.su' \
-o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
- -o -name '*.hdrtest.c' \
-o -name '*.lex.c' -o -name '*.tab.[ch]' \
-o -name '*.asn1.[ch]' \
-o -name '*.symtypes' -o -name 'modules.order' \
diff --git a/scripts/Makefile.build b/scripts/Makefile.build
index ee0319560513..776842b7e6a3 100644
--- a/scripts/Makefile.build
+++ b/scripts/Makefile.build
@@ -294,14 +294,14 @@ quiet_cmd_cc_lst_c = MKLST $@
$(obj)/%.lst: $(src)/%.c FORCE
$(call if_changed_dep,cc_lst_c)
-# Dummy C sources for header test (header-test-y target)
+# header test (header-test-y target)
# ---------------------------------------------------------------------------
-quiet_cmd_header_test = HDRTEST $@
- cmd_header_test = echo "\#include \"$*.h\"" > $@
+quiet_cmd_cc_s_h = CC $@
+ cmd_cc_s_h = $(CC) $(c_flags) -S -o $@ -x c /dev/null -include $<
-$(obj)/%.hdrtest.c:
- $(call cmd,header_test)
+$(obj)/%.h.s: $(src)/%.h FORCE
+ $(call if_changed_dep,cc_s_h)
# Compile assembler sources (.S)
# ---------------------------------------------------------------------------
diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
index 3e630fcaffd1..55ae1ec65342 100644
--- a/scripts/Makefile.lib
+++ b/scripts/Makefile.lib
@@ -67,7 +67,7 @@ extra-$(CONFIG_OF_ALL_DTBS) += $(patsubst %.dtb,%.dt.yaml, $(dtb-))
endif
# Test self-contained headers
-extra-$(CONFIG_HEADER_TEST) += $(patsubst %.h,%.hdrtest.o,$(header-test-y))
+extra-$(CONFIG_HEADER_TEST) += $(addsuffix .s, $(header-test-y))
# Add subdir path
--
2.17.1
^ permalink raw reply related
* [PATCH 0/7] Compile-test UAPI and kernel headers
From: Masahiro Yamada @ 2019-07-01 0:58 UTC (permalink / raw)
To: linux-kbuild
Cc: Sam Ravnborg, Joel Fernandes, Masahiro Yamada, Tony Luck,
linux-doc, John Fastabend, Jonathan Corbet, Jakub Kicinski,
linux-riscv, Daniel Borkmann, xdp-newbies, Anton Vorontsov,
Palmer Dabbelt, Matthias Brugger, Song Liu, Yonghong Song,
Michal Marek, Jesper Dangaard Brouer, Martin KaFai Lau,
linux-mediatek, linux-arm-kernel, Albert Ou, Colin Cross,
David S. Miller, Kees Cook, Alexei Starovoitov, netdev,
linux-kernel, bpf
1/7: add CONFIG_CC_CAN_LINK to use it in 2/7
2/7: Compile-test exported headers
3/7: Do not generate intermediate wrappers.
This will avoid header search path issue.
4/7: maybe useful for 7/7 and in some other places.
Add header-test-pattern-y syntax.
5/7: Minor cleanup of gen_kheaders.sh
6/7: Exclude all files without ".h" extension
from the kheaders_data.tar.xz
This will be needed by 7/7 because we need to
exclude "*.h.s" from the archive
7/7: Compile-test kernel-space headers in include/.
Masahiro Yamada (7):
init/Kconfig: add CONFIG_CC_CAN_LINK
kbuild: compile-test exported headers to ensure they are
self-contained
kbuild: do not create wrappers for header-test-y
kbuild: support header-test-pattern-y
kheaders: remove meaningless -R option of 'ls'
kheaders: include only headers into kheaders_data.tar.xz
kbuild: compile-test kernel headers to ensure they are self-contained
.gitignore | 1 -
Documentation/dontdiff | 1 -
Documentation/kbuild/makefiles.txt | 13 +-
Makefile | 4 +-
include/Kbuild | 1253 ++++++++++++++++++++++++++++
init/Kconfig | 24 +
kernel/gen_kheaders.sh | 51 +-
net/bpfilter/Kconfig | 2 +-
scripts/Makefile.build | 10 +-
scripts/Makefile.lib | 13 +-
usr/.gitignore | 1 -
usr/Makefile | 2 +
usr/include/.gitignore | 3 +
usr/include/Makefile | 131 +++
14 files changed, 1462 insertions(+), 47 deletions(-)
create mode 100644 include/Kbuild
create mode 100644 usr/include/.gitignore
create mode 100644 usr/include/Makefile
--
2.17.1
^ permalink raw reply
* Re: [PATCH 22/39] docs: ocxl.rst: add it to the uAPI book
From: Andrew Donnellan @ 2019-07-01 1:21 UTC (permalink / raw)
To: Mauro Carvalho Chehab, Linux Doc Mailing List
Cc: Mauro Carvalho Chehab, linux-kernel, Jonathan Corbet,
Frederic Barrat, linuxppc-dev
In-Reply-To: <ee63ec4412f2f8c87da877f67f693f2cd85c1a37.1561724493.git.mchehab+samsung@kernel.org>
On 28/6/19 10:30 pm, Mauro Carvalho Chehab wrote:
> The content of this file is user-faced.
>
> Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Acked-by: Andrew Donnellan <ajd@linux.ibm.com>
> ---
> Documentation/{ => userspace-api}/accelerators/ocxl.rst | 2 --
> Documentation/userspace-api/index.rst | 1 +
> MAINTAINERS | 2 +-
> 3 files changed, 2 insertions(+), 3 deletions(-)
> rename Documentation/{ => userspace-api}/accelerators/ocxl.rst (99%)
>
> diff --git a/Documentation/accelerators/ocxl.rst b/Documentation/userspace-api/accelerators/ocxl.rst
> similarity index 99%
> rename from Documentation/accelerators/ocxl.rst
> rename to Documentation/userspace-api/accelerators/ocxl.rst
> index b1cea19a90f5..14cefc020e2d 100644
> --- a/Documentation/accelerators/ocxl.rst
> +++ b/Documentation/userspace-api/accelerators/ocxl.rst
> @@ -1,5 +1,3 @@
> -:orphan:
> -
> ========================================================
> OpenCAPI (Open Coherent Accelerator Processor Interface)
> ========================================================
> diff --git a/Documentation/userspace-api/index.rst b/Documentation/userspace-api/index.rst
> index a3233da7fa88..ad494da40009 100644
> --- a/Documentation/userspace-api/index.rst
> +++ b/Documentation/userspace-api/index.rst
> @@ -20,6 +20,7 @@ place where this information is gathered.
> seccomp_filter
> unshare
> spec_ctrl
> + accelerators/ocxl
>
> .. only:: subproject and html
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 29d1498ad39d..f723371dccd0 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -11483,7 +11483,7 @@ F: arch/powerpc/include/asm/pnv-ocxl.h
> F: drivers/misc/ocxl/
> F: include/misc/ocxl*
> F: include/uapi/misc/ocxl.h
> -F: Documentation/accelerators/ocxl.rst
> +F: Documentation/userspace-api/accelerators/ocxl.rst
>
> OMAP AUDIO SUPPORT
> M: Peter Ujfalusi <peter.ujfalusi@ti.com>
>
--
Andrew Donnellan OzLabs, ADL Canberra
ajd@linux.ibm.com IBM Australia Limited
^ permalink raw reply
* Re: [PATCH 41/43] docs: extcon: convert it to ReST and move to acpi dir
From: Chanwoo Choi @ 2019-07-01 1:40 UTC (permalink / raw)
To: Mauro Carvalho Chehab, Linux Doc Mailing List
Cc: Mauro Carvalho Chehab, linux-kernel, Jonathan Corbet,
MyungJoo Ham, Rafael J. Wysocki, Len Brown, linux-acpi
In-Reply-To: <bce6d8c98a188ec5f0efe78962aa12839c7442e9.1561723980.git.mchehab+samsung@kernel.org>
Hi Mauro,
On 19. 6. 28. 오후 9:20, Mauro Carvalho Chehab wrote:
> The intel-int3496.txt file is a documentation for an ACPI driver.
>
> There's no reason to keep it on a separate directory.
>
> So, instead of keeping it on some random location, move it
> to a sub-directory inside the ACPI documentation dir,
> renaming it to .rst.
>
> Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
> ---
> .../acpi/extcon-intel-int3496.rst} | 14 ++++++++++----
> Documentation/firmware-guide/acpi/index.rst | 1 +
> MAINTAINERS | 6 +++---
> 3 files changed, 14 insertions(+), 7 deletions(-)
> rename Documentation/{extcon/intel-int3496.txt => firmware-guide/acpi/extcon-intel-int3496.rst} (66%)
>
> diff --git a/Documentation/extcon/intel-int3496.txt b/Documentation/firmware-guide/acpi/extcon-intel-int3496.rst
> similarity index 66%
> rename from Documentation/extcon/intel-int3496.txt
> rename to Documentation/firmware-guide/acpi/extcon-intel-int3496.rst
> index 8155dbc7fad3..5137ca834b54 100644
> --- a/Documentation/extcon/intel-int3496.txt
> +++ b/Documentation/firmware-guide/acpi/extcon-intel-int3496.rst
> @@ -1,5 +1,6 @@
> +=====================================================
> Intel INT3496 ACPI device extcon driver documentation
> ------------------------------------------------------
> +=====================================================
>
> The Intel INT3496 ACPI device extcon driver is a driver for ACPI
> devices with an acpi-id of INT3496, such as found for example on
> @@ -13,15 +14,20 @@ between an USB host and an USB peripheral controller.
> The ACPI devices exposes this functionality by returning an array with up
> to 3 gpio descriptors from its ACPI _CRS (Current Resource Settings) call:
>
> -Index 0: The input gpio for the id-pin, this is always present and valid
> -Index 1: The output gpio for enabling Vbus output from the device to the otg
> +======= =====================================================================
> +Index 0 The input gpio for the id-pin, this is always present and valid
> +Index 1 The output gpio for enabling Vbus output from the device to the otg
> port, write 1 to enable the Vbus output (this gpio descriptor may
> be absent or invalid)
> -Index 2: The output gpio for muxing of the data pins between the USB host and
> +Index 2 The output gpio for muxing of the data pins between the USB host and
> the USB peripheral controller, write 1 to mux to the peripheral
> controller
> +======= =====================================================================
>
> There is a mapping between indices and GPIO connection IDs as follows
> +
> + ======= =======
> id index 0
> vbus index 1
> mux index 2
> + ======= =======
> diff --git a/Documentation/firmware-guide/acpi/index.rst b/Documentation/firmware-guide/acpi/index.rst
> index ae609eec4679..90c90d42d9ad 100644
> --- a/Documentation/firmware-guide/acpi/index.rst
> +++ b/Documentation/firmware-guide/acpi/index.rst
> @@ -24,3 +24,4 @@ ACPI Support
> acpi-lid
> lpit
> video_extension
> + extcon-intel-int3496
> diff --git a/MAINTAINERS b/MAINTAINERS
> index fd6fab0dec77..2cf8abf6d48e 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -321,7 +321,7 @@ F: drivers/pnp/pnpacpi/
> F: include/linux/acpi.h
> F: include/linux/fwnode.h
> F: include/acpi/
> -F: Documentation/acpi/
> +F: Documentation/firmware-guide/acpi/
> F: Documentation/ABI/testing/sysfs-bus-acpi
> F: Documentation/ABI/testing/configfs-acpi
> F: drivers/pci/*acpi*
> @@ -4896,7 +4896,7 @@ S: Maintained
> F: Documentation/
> F: scripts/kernel-doc
> X: Documentation/ABI/
> -X: Documentation/acpi/
> +X: Documentation/firmware-guide/acpi/
> X: Documentation/devicetree/
> X: Documentation/i2c/
> X: Documentation/media/
> @@ -6073,7 +6073,7 @@ S: Maintained
> F: drivers/extcon/
> F: include/linux/extcon/
> F: include/linux/extcon.h
> -F: Documentation/extcon/
> +F: Documentation/firmware-guide/acpi/extcon-intel-int3496.rst
> F: Documentation/devicetree/bindings/extcon/
>
> EXYNOS DP DRIVER
>
Acked-by: Chanwoo Choi <cw00.choi@samsung.com>
--
Best Regards,
Chanwoo Choi
Samsung Electronics
^ permalink raw reply
* Re: [UPDATE][PATCH 10/10] tools/power/x86: A tool to validate Intel Speed Select commands
From: Andy Shevchenko @ 2019-07-01 11:32 UTC (permalink / raw)
To: Srinivas Pandruvada
Cc: Darren Hart, Andy Shevchenko, Andriy Shevchenko, Jonathan Corbet,
Rafael J. Wysocki, Alan Cox, Len Brown, prarit, darcari,
Linux Documentation List, Linux Kernel Mailing List,
Platform Driver
In-Reply-To: <20190630171408.8673-1-srinivas.pandruvada@linux.intel.com>
On Sun, Jun 30, 2019 at 8:14 PM Srinivas Pandruvada
<srinivas.pandruvada@linux.intel.com> wrote:
>
> The Intel(R) Speed select technologies contains four features.
>
> Performance profile:An non architectural mechanism that allows multiple
> optimized performance profiles per system via static and/or dynamic
> adjustment of core count, workload, Tjmax, and TDP, etc. aka ISS
> in the documentation.
>
> Base Frequency: Enables users to increase guaranteed base frequency on
> certain cores (high priority cores) in exchange for lower base frequency
> on remaining cores (low priority cores). aka PBF in the documenation.
>
> Turbo frequency: Enables the ability to set different turbo ratio limits
> to cores based on priority. aka FACT in the documentation.
>
> Core power: An Interface that allows user to define per core/tile
> priority.
>
> There is a multi level help for commands and options. This can be used
> to check required arguments for each feature and commands for the
> feature.
>
> To start navigating the features start with
>
> $sudo intel-speed-select --help
>
> For help on a specific feature for example
> $sudo intel-speed-select perf-profile --help
>
> To get help for a command for a feature for example
> $sudo intel-speed-select perf-profile get-lock-status --help
>
> Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
> ---
> Updates:
> - Copied Makefile from tools/gpio and moified the Makefile here
> - Added entry to tools/build/Makefile
> - Rename directory to match the executable name
> - Fix one error message
Thanks!
I pushed to my review and testing queue, while still waiting for some ACKs.
It seems I can promote the driver itself now,w/o tools, if you want me to do so.
--
With Best Regards,
Andy Shevchenko
^ permalink raw reply
* [PATCH] Documentation: gpio: Fix reference to gpiod_get_array()
From: Geert Uytterhoeven @ 2019-07-01 14:10 UTC (permalink / raw)
To: Linus Walleij, Bartosz Golaszewski, Jonathan Corbet
Cc: Janusz Krzysztofik, linux-gpio, linux-doc, linux-kernel,
Geert Uytterhoeven
The function is called gpiod_get_array(), not gpiod_array_get().
Fixes: 77588c14ac868cae ("gpiolib: Pass array info to get/set array functions")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
---
Documentation/driver-api/gpio/consumer.rst | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/Documentation/driver-api/gpio/consumer.rst b/Documentation/driver-api/gpio/consumer.rst
index 23d68c321c5c7c7d..9559aa3cbcef25a2 100644
--- a/Documentation/driver-api/gpio/consumer.rst
+++ b/Documentation/driver-api/gpio/consumer.rst
@@ -364,7 +364,7 @@ accessed sequentially.
The functions take three arguments:
* array_size - the number of array elements
* desc_array - an array of GPIO descriptors
- * array_info - optional information obtained from gpiod_array_get()
+ * array_info - optional information obtained from gpiod_get_array()
* value_bitmap - a bitmap to store the GPIOs' values (get) or
a bitmap of values to assign to the GPIOs (set)
--
2.17.1
^ permalink raw reply related
* Re: [PATCH v12 00/11] Appended signatures support for IMA appraisal
From: Mimi Zohar @ 2019-07-01 14:38 UTC (permalink / raw)
To: Thiago Jung Bauermann, linux-integrity
Cc: linux-security-module, keyrings, linux-crypto, linuxppc-dev,
linux-doc, linux-kernel, Dmitry Kasatkin, James Morris,
Serge E. Hallyn, David Howells, David Woodhouse, Jessica Yu,
Herbert Xu, David S. Miller, Jonathan Corbet, AKASHI, Takahiro
In-Reply-To: <20190628021934.4260-1-bauerman@linux.ibm.com>
On Thu, 2019-06-27 at 23:19 -0300, Thiago Jung Bauermann wrote:
> Hello,
>
> This version is essentially identical to the last one.
>
> It is only a rebase on top of today's linux-integrity/next-queued-testing,
> prompted by conflicts with Prakhar Srivastava's patches to measure the
> kernel command line. It also drops two patches that are already present in
> that branch.
Thanks, Thiago. These patches are now in next-queued-testing waiting
for some additional reviews/acks.
Mimi
^ permalink raw reply
* Re: [PATCH v12 01/11] MODSIGN: Export module signature definitions
From: Jessica Yu @ 2019-07-01 14:47 UTC (permalink / raw)
To: Thiago Jung Bauermann
Cc: linux-integrity, linux-security-module, keyrings, linux-crypto,
linuxppc-dev, linux-doc, linux-kernel, Mimi Zohar,
Dmitry Kasatkin, James Morris, Serge E. Hallyn, David Howells,
David Woodhouse, Herbert Xu, David S. Miller, Jonathan Corbet,
AKASHI, Takahiro
In-Reply-To: <20190628021934.4260-2-bauerman@linux.ibm.com>
+++ Thiago Jung Bauermann [27/06/19 23:19 -0300]:
>IMA will use the module_signature format for append signatures, so export
>the relevant definitions and factor out the code which verifies that the
>appended signature trailer is valid.
>
>Also, create a CONFIG_MODULE_SIG_FORMAT option so that IMA can select it
>and be able to use mod_check_sig() without having to depend on either
>CONFIG_MODULE_SIG or CONFIG_MODULES.
>
>Signed-off-by: Thiago Jung Bauermann <bauerman@linux.ibm.com>
>Reviewed-by: Mimi Zohar <zohar@linux.ibm.com>
>Cc: Jessica Yu <jeyu@kernel.org>
>---
> include/linux/module.h | 3 --
> include/linux/module_signature.h | 44 +++++++++++++++++++++++++
> init/Kconfig | 6 +++-
> kernel/Makefile | 1 +
> kernel/module.c | 1 +
> kernel/module_signature.c | 46 ++++++++++++++++++++++++++
> kernel/module_signing.c | 56 +++++---------------------------
> scripts/Makefile | 2 +-
> 8 files changed, 106 insertions(+), 53 deletions(-)
>
>diff --git a/include/linux/module.h b/include/linux/module.h
>index 188998d3dca9..aa56f531cf1e 100644
>--- a/include/linux/module.h
>+++ b/include/linux/module.h
>@@ -25,9 +25,6 @@
> #include <linux/percpu.h>
> #include <asm/module.h>
>
>-/* In stripped ARM and x86-64 modules, ~ is surprisingly rare. */
>-#define MODULE_SIG_STRING "~Module signature appended~\n"
>-
Hi Thiago, apologies for the delay.
It looks like arch/s390/kernel/machine_kexec_file.c also relies on
MODULE_SIG_STRING being defined, so module_signature.h will need to be
included there too, otherwise we'll run into a compilation error.
Other than that, the module-related changes look good to me:
Acked-by: Jessica Yu <jeyu@kernel.org>
Thanks!
Jessica
> /* Not Yet Implemented */
> #define MODULE_SUPPORTED_DEVICE(name)
>
>diff --git a/include/linux/module_signature.h b/include/linux/module_signature.h
>new file mode 100644
>index 000000000000..523617fc5b6a
>--- /dev/null
>+++ b/include/linux/module_signature.h
>@@ -0,0 +1,44 @@
>+/* SPDX-License-Identifier: GPL-2.0+ */
>+/*
>+ * Module signature handling.
>+ *
>+ * Copyright (C) 2012 Red Hat, Inc. All Rights Reserved.
>+ * Written by David Howells (dhowells@redhat.com)
>+ */
>+
>+#ifndef _LINUX_MODULE_SIGNATURE_H
>+#define _LINUX_MODULE_SIGNATURE_H
>+
>+/* In stripped ARM and x86-64 modules, ~ is surprisingly rare. */
>+#define MODULE_SIG_STRING "~Module signature appended~\n"
>+
>+enum pkey_id_type {
>+ PKEY_ID_PGP, /* OpenPGP generated key ID */
>+ PKEY_ID_X509, /* X.509 arbitrary subjectKeyIdentifier */
>+ PKEY_ID_PKCS7, /* Signature in PKCS#7 message */
>+};
>+
>+/*
>+ * Module signature information block.
>+ *
>+ * The constituents of the signature section are, in order:
>+ *
>+ * - Signer's name
>+ * - Key identifier
>+ * - Signature data
>+ * - Information block
>+ */
>+struct module_signature {
>+ u8 algo; /* Public-key crypto algorithm [0] */
>+ u8 hash; /* Digest algorithm [0] */
>+ u8 id_type; /* Key identifier type [PKEY_ID_PKCS7] */
>+ u8 signer_len; /* Length of signer's name [0] */
>+ u8 key_id_len; /* Length of key identifier [0] */
>+ u8 __pad[3];
>+ __be32 sig_len; /* Length of signature data */
>+};
>+
>+int mod_check_sig(const struct module_signature *ms, size_t file_len,
>+ const char *name);
>+
>+#endif /* _LINUX_MODULE_SIGNATURE_H */
>diff --git a/init/Kconfig b/init/Kconfig
>index 8b9ffe236e4f..c2286a3c74c5 100644
>--- a/init/Kconfig
>+++ b/init/Kconfig
>@@ -1852,6 +1852,10 @@ config BASE_SMALL
> default 0 if BASE_FULL
> default 1 if !BASE_FULL
>
>+config MODULE_SIG_FORMAT
>+ def_bool n
>+ select SYSTEM_DATA_VERIFICATION
>+
> menuconfig MODULES
> bool "Enable loadable module support"
> option modules
>@@ -1929,7 +1933,7 @@ config MODULE_SRCVERSION_ALL
> config MODULE_SIG
> bool "Module signature verification"
> depends on MODULES
>- select SYSTEM_DATA_VERIFICATION
>+ select MODULE_SIG_FORMAT
> help
> Check modules for valid signatures upon load: the signature
> is simply appended to the module. For more information see
>diff --git a/kernel/Makefile b/kernel/Makefile
>index 33824f0385b3..f29ae2997a43 100644
>--- a/kernel/Makefile
>+++ b/kernel/Makefile
>@@ -58,6 +58,7 @@ endif
> obj-$(CONFIG_UID16) += uid16.o
> obj-$(CONFIG_MODULES) += module.o
> obj-$(CONFIG_MODULE_SIG) += module_signing.o
>+obj-$(CONFIG_MODULE_SIG_FORMAT) += module_signature.o
> obj-$(CONFIG_KALLSYMS) += kallsyms.o
> obj-$(CONFIG_BSD_PROCESS_ACCT) += acct.o
> obj-$(CONFIG_CRASH_CORE) += crash_core.o
>diff --git a/kernel/module.c b/kernel/module.c
>index 6e6712b3aaf5..2712f4d217f5 100644
>--- a/kernel/module.c
>+++ b/kernel/module.c
>@@ -19,6 +19,7 @@
> #include <linux/export.h>
> #include <linux/extable.h>
> #include <linux/moduleloader.h>
>+#include <linux/module_signature.h>
> #include <linux/trace_events.h>
> #include <linux/init.h>
> #include <linux/kallsyms.h>
>diff --git a/kernel/module_signature.c b/kernel/module_signature.c
>new file mode 100644
>index 000000000000..4224a1086b7d
>--- /dev/null
>+++ b/kernel/module_signature.c
>@@ -0,0 +1,46 @@
>+// SPDX-License-Identifier: GPL-2.0+
>+/*
>+ * Module signature checker
>+ *
>+ * Copyright (C) 2012 Red Hat, Inc. All Rights Reserved.
>+ * Written by David Howells (dhowells@redhat.com)
>+ */
>+
>+#include <linux/errno.h>
>+#include <linux/printk.h>
>+#include <linux/module_signature.h>
>+#include <asm/byteorder.h>
>+
>+/**
>+ * mod_check_sig - check that the given signature is sane
>+ *
>+ * @ms: Signature to check.
>+ * @file_len: Size of the file to which @ms is appended.
>+ * @name: What is being checked. Used for error messages.
>+ */
>+int mod_check_sig(const struct module_signature *ms, size_t file_len,
>+ const char *name)
>+{
>+ if (be32_to_cpu(ms->sig_len) >= file_len - sizeof(*ms))
>+ return -EBADMSG;
>+
>+ if (ms->id_type != PKEY_ID_PKCS7) {
>+ pr_err("%s: Module is not signed with expected PKCS#7 message\n",
>+ name);
>+ return -ENOPKG;
>+ }
>+
>+ if (ms->algo != 0 ||
>+ ms->hash != 0 ||
>+ ms->signer_len != 0 ||
>+ ms->key_id_len != 0 ||
>+ ms->__pad[0] != 0 ||
>+ ms->__pad[1] != 0 ||
>+ ms->__pad[2] != 0) {
>+ pr_err("%s: PKCS#7 signature info has unexpected non-zero params\n",
>+ name);
>+ return -EBADMSG;
>+ }
>+
>+ return 0;
>+}
>diff --git a/kernel/module_signing.c b/kernel/module_signing.c
>index 6b9a926fd86b..cdd04a6b8074 100644
>--- a/kernel/module_signing.c
>+++ b/kernel/module_signing.c
>@@ -11,37 +11,13 @@
>
> #include <linux/kernel.h>
> #include <linux/errno.h>
>+#include <linux/module.h>
>+#include <linux/module_signature.h>
> #include <linux/string.h>
> #include <linux/verification.h>
> #include <crypto/public_key.h>
> #include "module-internal.h"
>
>-enum pkey_id_type {
>- PKEY_ID_PGP, /* OpenPGP generated key ID */
>- PKEY_ID_X509, /* X.509 arbitrary subjectKeyIdentifier */
>- PKEY_ID_PKCS7, /* Signature in PKCS#7 message */
>-};
>-
>-/*
>- * Module signature information block.
>- *
>- * The constituents of the signature section are, in order:
>- *
>- * - Signer's name
>- * - Key identifier
>- * - Signature data
>- * - Information block
>- */
>-struct module_signature {
>- u8 algo; /* Public-key crypto algorithm [0] */
>- u8 hash; /* Digest algorithm [0] */
>- u8 id_type; /* Key identifier type [PKEY_ID_PKCS7] */
>- u8 signer_len; /* Length of signer's name [0] */
>- u8 key_id_len; /* Length of key identifier [0] */
>- u8 __pad[3];
>- __be32 sig_len; /* Length of signature data */
>-};
>-
> /*
> * Verify the signature on a module.
> */
>@@ -49,6 +25,7 @@ int mod_verify_sig(const void *mod, struct load_info *info)
> {
> struct module_signature ms;
> size_t sig_len, modlen = info->len;
>+ int ret;
>
> pr_devel("==>%s(,%zu)\n", __func__, modlen);
>
>@@ -56,32 +33,15 @@ int mod_verify_sig(const void *mod, struct load_info *info)
> return -EBADMSG;
>
> memcpy(&ms, mod + (modlen - sizeof(ms)), sizeof(ms));
>- modlen -= sizeof(ms);
>+
>+ ret = mod_check_sig(&ms, modlen, info->name);
>+ if (ret)
>+ return ret;
>
> sig_len = be32_to_cpu(ms.sig_len);
>- if (sig_len >= modlen)
>- return -EBADMSG;
>- modlen -= sig_len;
>+ modlen -= sig_len + sizeof(ms);
> info->len = modlen;
>
>- if (ms.id_type != PKEY_ID_PKCS7) {
>- pr_err("%s: Module is not signed with expected PKCS#7 message\n",
>- info->name);
>- return -ENOPKG;
>- }
>-
>- if (ms.algo != 0 ||
>- ms.hash != 0 ||
>- ms.signer_len != 0 ||
>- ms.key_id_len != 0 ||
>- ms.__pad[0] != 0 ||
>- ms.__pad[1] != 0 ||
>- ms.__pad[2] != 0) {
>- pr_err("%s: PKCS#7 signature info has unexpected non-zero params\n",
>- info->name);
>- return -EBADMSG;
>- }
>-
> return verify_pkcs7_signature(mod, modlen, mod + modlen, sig_len,
> VERIFY_USE_SECONDARY_KEYRING,
> VERIFYING_MODULE_SIGNATURE,
>diff --git a/scripts/Makefile b/scripts/Makefile
>index 9d442ee050bd..52098b080ab7 100644
>--- a/scripts/Makefile
>+++ b/scripts/Makefile
>@@ -17,7 +17,7 @@ hostprogs-$(CONFIG_VT) += conmakehash
> hostprogs-$(BUILD_C_RECORDMCOUNT) += recordmcount
> hostprogs-$(CONFIG_BUILDTIME_EXTABLE_SORT) += sortextable
> hostprogs-$(CONFIG_ASN1) += asn1_compiler
>-hostprogs-$(CONFIG_MODULE_SIG) += sign-file
>+hostprogs-$(CONFIG_MODULE_SIG_FORMAT) += sign-file
> hostprogs-$(CONFIG_SYSTEM_TRUSTED_KEYRING) += extract-cert
> hostprogs-$(CONFIG_SYSTEM_EXTRA_CERTIFICATE) += insert-sys-cert
>
^ permalink raw reply
* Re: [linux-kernel-mentees] [PATCH v1] Doc : fs : convert xfs.txt to ReST
From: Eric Sandeen @ 2019-07-01 14:54 UTC (permalink / raw)
To: Jonathan Corbet, Sheriff Esseson
Cc: skhan, linux-kernel-mentees, darrick.wong, linux-xfs, linux-doc,
linux-kernel
In-Reply-To: <20190630113243.7265c33e@lwn.net>
On 6/30/19 12:32 PM, Jonathan Corbet wrote:
> On Sun, 30 Jun 2019 17:50:46 +0100
> Sheriff Esseson <sheriffesseson@gmail.com> wrote:
>
>> On Sat, Jun 29, 2019 at 09:57:59PM +0100, Sheriff Esseson wrote:
>>> Signed-off-by: Sheriff Esseson <sheriffesseson@gmail.com>
>>> ---
>>>
>>> In v3:
>>> Update MAINTAINERS. Fix Indentation/long line issues. Insert Sphinx tag.
>>>
>>> --
>>> 2.22.0
>>>
>>
>> Signed-off-by: Sheriff Esseson <sheriffesseson@gmail.com>
>> ---
>>
>> In v4:
>> dax.txt :
>> fix broken reference to xfs.rst
>
> I will now repeat what I said yesterday:
>
>> Please do us a favor?
>>
>> 1) Post each patch standalone, without quoted text, ready to be applied.
To be maybe more explicit,
While we appreciate the eagerness here I'd like to reiterate that the
followup V2, V3, ... patches should each be a standalone, self-contained
email, without any quoted text and with updated subject lines, i.e.
Subject: [PATCH] Doc : fs : convert xfs.txt to ReST
followed by:
Subject: [PATCH V2] Doc : fs : convert xfs.txt to ReST
followed by:
Subject: [PATCH V3] Doc : fs : convert xfs.txt to ReST
so it's trivial to see from subject lines when a new version has been
sent.
Also, what Jonathan said about time between iterations. ;)
Thanks,
-Eric
>> 2) Wait a little while between postings so that you can address more than
>> one comment at a time.
>>
>> OK, two favors - off-by-one errors are my specialty...:)
>
> I did actually mean that. For "a little while" I meant "a few days or
> so". Please slow down a little. In any case, we're getting closer to the
> merge window, so this patch won't be applied for a while regardless.
>
> Thanks,
>
> jon
>
^ permalink raw reply
* [PATCH v14 00/13] Ingenic TCU patchset v14
From: Paul Cercueil @ 2019-07-01 15:13 UTC (permalink / raw)
To: Lee Jones, Jonathan Corbet, Ralf Baechle, Paul Burton,
James Hogan, Michael Turquette, Stephen Boyd, Thomas Gleixner,
Daniel Lezcano
Cc: Mathieu Malaterre, od, devicetree, linux-kernel, linux-doc,
linux-mips, linux-clk
Hi,
Changelog from v13:
- [02/13]: The documentation has been converted to ReStructured Text.
- [04/13]: - Use ERR_CAST() instead of ERR_PTR(PTR_ERR())
- Remove ingenic_tcu_can_use_pwm().
- [05/13]: Use %d instead of %i in messages
- [06/13]: Remove empty lines in structure definitions
- [07/13]: Remove empty lines in structure definitions
The patches that are not listed above did not see any change since v13.
Regards,
-Paul
^ permalink raw reply
* [PATCH v14 02/13] doc: Add doc for the Ingenic TCU hardware
From: Paul Cercueil @ 2019-07-01 15:13 UTC (permalink / raw)
To: Lee Jones, Jonathan Corbet, Ralf Baechle, Paul Burton,
James Hogan, Michael Turquette, Stephen Boyd, Thomas Gleixner,
Daniel Lezcano
Cc: Mathieu Malaterre, od, devicetree, linux-kernel, linux-doc,
linux-mips, linux-clk, Paul Cercueil, Artur Rojek
In-Reply-To: <20190701151410.23127-1-paul@crapouillou.net>
Add documentation about the Timer/Counter Unit (TCU) present in the
Ingenic JZ47xx SoCs.
The Timer/Counter Unit (TCU) in Ingenic JZ47xx SoCs is a multi-function
hardware block. It features up to to eight channels, that can be used as
counters, timers, or PWM.
- JZ4725B, JZ4750, JZ4755 only have six TCU channels. The other SoCs all
have eight channels.
- JZ4725B introduced a separate channel, called Operating System Timer
(OST). It is a 32-bit programmable timer. On JZ4770 and above, it is
64-bit.
- Each one of the TCU channels has its own clock, which can be reparented
to three different clocks (pclk, ext, rtc), gated, and reclocked, through
their TCSR register.
* The watchdog and OST hardware blocks also feature a TCSR register with
the same format in their register space.
* The TCU registers used to gate/ungate can also gate/ungate the watchdog
and OST clocks.
- Each TCU channel works in one of two modes:
* mode TCU1: channels cannot work in sleep mode, but are easier to
operate.
* mode TCU2: channels can work in sleep mode, but the operation is a bit
more complicated than with TCU1 channels.
- The mode of each TCU channel depends on the SoC used:
* On the oldest SoCs (up to JZ4740), all of the eight channels operate in
TCU1 mode.
* On JZ4725B, channel 5 operates as TCU2, the others operate as TCU1.
* On newest SoCs (JZ4750 and above), channels 1-2 operate as TCU2, the
others operate as TCU1.
- Each channel can generate an interrupt. Some channels share an interrupt
line, some don't, and this changes between SoC versions:
* on older SoCs (JZ4740 and below), channel 0 and channel 1 have their
own interrupt line; channels 2-7 share the last interrupt line.
* On JZ4725B, channel 0 has its own interrupt; channels 1-5 share one
interrupt line; the OST uses the last interrupt line.
* on newer SoCs (JZ4750 and above), channel 5 has its own interrupt;
channels 0-4 and (if eight channels) 6-7 all share one interrupt line;
the OST uses the last interrupt line.
Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Tested-by: Mathieu Malaterre <malat@debian.org>
Tested-by: Artur Rojek <contact@artur-rojek.eu>
---
Notes:
v4: New patch in this series
v5: Added information about number of channels, and improved
documentation about channel modes
v6: Add info about OST (can be 32-bit on older SoCs)
v7-v11: No change
v12: Add details about new implementation
v13: No change
v14: Convert to ReStructured Text
Documentation/index.rst | 1 +
Documentation/mips/index.rst | 11 +++++
Documentation/mips/ingenic-tcu.rst | 72 ++++++++++++++++++++++++++++++
3 files changed, 84 insertions(+)
create mode 100644 Documentation/mips/index.rst
create mode 100644 Documentation/mips/ingenic-tcu.rst
diff --git a/Documentation/index.rst b/Documentation/index.rst
index a7566ef62411..00481ac8d75f 100644
--- a/Documentation/index.rst
+++ b/Documentation/index.rst
@@ -115,6 +115,7 @@ implementation.
x86/index
sh/index
x86/index
+ mips/index
Filesystem Documentation
------------------------
diff --git a/Documentation/mips/index.rst b/Documentation/mips/index.rst
new file mode 100644
index 000000000000..321b4794f3b8
--- /dev/null
+++ b/Documentation/mips/index.rst
@@ -0,0 +1,11 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+===========================
+MIPS-specific Documentation
+===========================
+
+.. toctree::
+ :maxdepth: 1
+ :numbered:
+
+ ingenic-tcu
diff --git a/Documentation/mips/ingenic-tcu.rst b/Documentation/mips/ingenic-tcu.rst
new file mode 100644
index 000000000000..651c2ebccf71
--- /dev/null
+++ b/Documentation/mips/ingenic-tcu.rst
@@ -0,0 +1,72 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+===============================================
+Ingenic JZ47xx SoCs Timer/Counter Unit hardware
+===============================================
+
+The Timer/Counter Unit (TCU) in Ingenic JZ47xx SoCs is a multi-function
+hardware block. It features up to to eight channels, that can be used as
+counters, timers, or PWM.
+
+- JZ4725B, JZ4750, JZ4755 only have six TCU channels. The other SoCs all
+ have eight channels.
+
+- JZ4725B introduced a separate channel, called Operating System Timer
+ (OST). It is a 32-bit programmable timer. On JZ4760B and above, it is
+ 64-bit.
+
+- Each one of the TCU channels has its own clock, which can be reparented to three
+ different clocks (pclk, ext, rtc), gated, and reclocked, through their TCSR register.
+
+ - The watchdog and OST hardware blocks also feature a TCSR register with the same
+ format in their register space.
+ - The TCU registers used to gate/ungate can also gate/ungate the watchdog and
+ OST clocks.
+
+- Each TCU channel works in one of two modes:
+
+ - mode TCU1: channels cannot work in sleep mode, but are easier to
+ operate.
+ - mode TCU2: channels can work in sleep mode, but the operation is a bit
+ more complicated than with TCU1 channels.
+
+- The mode of each TCU channel depends on the SoC used:
+
+ - On the oldest SoCs (up to JZ4740), all of the eight channels operate in
+ TCU1 mode.
+ - On JZ4725B, channel 5 operates as TCU2, the others operate as TCU1.
+ - On newest SoCs (JZ4750 and above), channels 1-2 operate as TCU2, the
+ others operate as TCU1.
+
+- Each channel can generate an interrupt. Some channels share an interrupt
+ line, some don't, and this changes between SoC versions:
+
+ - on older SoCs (JZ4740 and below), channel 0 and channel 1 have their
+ own interrupt line; channels 2-7 share the last interrupt line.
+ - On JZ4725B, channel 0 has its own interrupt; channels 1-5 share one
+ interrupt line; the OST uses the last interrupt line.
+ - on newer SoCs (JZ4750 and above), channel 5 has its own interrupt;
+ channels 0-4 and (if eight channels) 6-7 all share one interrupt line;
+ the OST uses the last interrupt line.
+
+Implementation
+==============
+
+The functionalities of the TCU hardware are spread across multiple drivers:
+
+=========== =====
+boilerplate drivers/mfd/ingenic-tcu.c
+clocks drivers/clk/ingenic/tcu.c
+interrupts drivers/irqchip/irq-ingenic-tcu.c
+timers drivers/clocksource/ingenic-timer.c
+OST drivers/clocksource/ingenic-ost.c
+PWM drivers/pwm/pwm-jz4740.c
+watchdog drivers/watchdog/jz4740_wdt.c
+=========== =====
+
+Because various functionalities of the TCU that belong to different drivers
+and frameworks can be controlled from the same registers, all of these
+drivers access their registers through the same regmap.
+
+For more information regarding the devicetree bindings of the TCU drivers,
+have a look at Documentation/devicetree/bindings/mfd/ingenic,tcu.txt.
--
2.21.0.593.g511ec345e18
^ permalink raw reply related
* [PATCH v14 06/13] irqchip: Add irq-ingenic-tcu driver
From: Paul Cercueil @ 2019-07-01 15:14 UTC (permalink / raw)
To: Lee Jones, Jonathan Corbet, Ralf Baechle, Paul Burton,
James Hogan, Michael Turquette, Stephen Boyd, Thomas Gleixner,
Daniel Lezcano
Cc: Mathieu Malaterre, od, devicetree, linux-kernel, linux-doc,
linux-mips, linux-clk, Paul Cercueil, Artur Rojek
In-Reply-To: <20190701151410.23127-1-paul@crapouillou.net>
This driver handles the interrupt controller built in the Timer/Counter
Unit (TCU) of the JZ47xx SoCs from Ingenic.
Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Tested-by: Mathieu Malaterre <malat@debian.org>
Tested-by: Artur Rojek <contact@artur-rojek.eu>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
---
Notes:
v12: New patch
v13: No change
v14: Remove empty lines in structure definitions
drivers/irqchip/Kconfig | 11 ++
drivers/irqchip/Makefile | 1 +
drivers/irqchip/irq-ingenic-tcu.c | 181 ++++++++++++++++++++++++++++++
3 files changed, 193 insertions(+)
create mode 100644 drivers/irqchip/irq-ingenic-tcu.c
diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig
index 659c5e0fb835..edc67268f777 100644
--- a/drivers/irqchip/Kconfig
+++ b/drivers/irqchip/Kconfig
@@ -294,6 +294,17 @@ config INGENIC_IRQ
depends on MACH_INGENIC
default y
+config INGENIC_TCU_IRQ
+ bool "Ingenic JZ47xx TCU interrupt controller"
+ default MACH_INGENIC
+ depends on MIPS || COMPILE_TEST
+ select INGENIC_TCU
+ help
+ Support for interrupts in the Timer/Counter Unit (TCU) of the Ingenic
+ JZ47xx SoCs.
+
+ If unsure, say N.
+
config RENESAS_H8300H_INTC
bool
select IRQ_DOMAIN
diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile
index 606a003a0000..f403b2c221e4 100644
--- a/drivers/irqchip/Makefile
+++ b/drivers/irqchip/Makefile
@@ -73,6 +73,7 @@ obj-$(CONFIG_RENESAS_H8300H_INTC) += irq-renesas-h8300h.o
obj-$(CONFIG_RENESAS_H8S_INTC) += irq-renesas-h8s.o
obj-$(CONFIG_ARCH_SA1100) += irq-sa11x0.o
obj-$(CONFIG_INGENIC_IRQ) += irq-ingenic.o
+obj-$(CONFIG_INGENIC_TCU_IRQ) += irq-ingenic-tcu.o
obj-$(CONFIG_IMX_GPCV2) += irq-imx-gpcv2.o
obj-$(CONFIG_PIC32_EVIC) += irq-pic32-evic.o
obj-$(CONFIG_MSCC_OCELOT_IRQ) += irq-mscc-ocelot.o
diff --git a/drivers/irqchip/irq-ingenic-tcu.c b/drivers/irqchip/irq-ingenic-tcu.c
new file mode 100644
index 000000000000..f43bd39d3a11
--- /dev/null
+++ b/drivers/irqchip/irq-ingenic-tcu.c
@@ -0,0 +1,181 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * JZ47xx SoCs TCU IRQ driver
+ * Copyright (C) 2019 Paul Cercueil <paul@crapouillou.net>
+ */
+
+#include <linux/clk.h>
+#include <linux/interrupt.h>
+#include <linux/irqchip.h>
+#include <linux/irqchip/chained_irq.h>
+#include <linux/mfd/ingenic-tcu.h>
+#include <linux/of_irq.h>
+#include <linux/regmap.h>
+
+struct ingenic_tcu {
+ struct regmap *map;
+ struct clk *clk;
+ struct irq_domain *domain;
+ unsigned int nb_parent_irqs;
+ u32 parent_irqs[3];
+};
+
+static void ingenic_tcu_intc_cascade(struct irq_desc *desc)
+{
+ struct irq_chip *irq_chip = irq_data_get_irq_chip(&desc->irq_data);
+ struct irq_domain *domain = irq_desc_get_handler_data(desc);
+ struct irq_chip_generic *gc = irq_get_domain_generic_chip(domain, 0);
+ struct regmap *map = gc->private;
+ uint32_t irq_reg, irq_mask;
+ unsigned int i;
+
+ regmap_read(map, TCU_REG_TFR, &irq_reg);
+ regmap_read(map, TCU_REG_TMR, &irq_mask);
+
+ chained_irq_enter(irq_chip, desc);
+
+ irq_reg &= ~irq_mask;
+
+ for_each_set_bit(i, (unsigned long *)&irq_reg, 32)
+ generic_handle_irq(irq_linear_revmap(domain, i));
+
+ chained_irq_exit(irq_chip, desc);
+}
+
+static void ingenic_tcu_gc_unmask_enable_reg(struct irq_data *d)
+{
+ struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
+ struct irq_chip_type *ct = irq_data_get_chip_type(d);
+ struct regmap *map = gc->private;
+ u32 mask = d->mask;
+
+ irq_gc_lock(gc);
+ regmap_write(map, ct->regs.ack, mask);
+ regmap_write(map, ct->regs.enable, mask);
+ *ct->mask_cache |= mask;
+ irq_gc_unlock(gc);
+}
+
+static void ingenic_tcu_gc_mask_disable_reg(struct irq_data *d)
+{
+ struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
+ struct irq_chip_type *ct = irq_data_get_chip_type(d);
+ struct regmap *map = gc->private;
+ u32 mask = d->mask;
+
+ irq_gc_lock(gc);
+ regmap_write(map, ct->regs.disable, mask);
+ *ct->mask_cache &= ~mask;
+ irq_gc_unlock(gc);
+}
+
+static void ingenic_tcu_gc_mask_disable_reg_and_ack(struct irq_data *d)
+{
+ struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
+ struct irq_chip_type *ct = irq_data_get_chip_type(d);
+ struct regmap *map = gc->private;
+ u32 mask = d->mask;
+
+ irq_gc_lock(gc);
+ regmap_write(map, ct->regs.ack, mask);
+ regmap_write(map, ct->regs.disable, mask);
+ irq_gc_unlock(gc);
+}
+
+static int __init ingenic_tcu_irq_init(struct device_node *np,
+ struct device_node *parent)
+{
+ struct irq_chip_generic *gc;
+ struct irq_chip_type *ct;
+ struct ingenic_tcu *tcu;
+ struct regmap *map;
+ unsigned int i;
+ int ret, irqs;
+
+ map = ingenic_tcu_get_regmap(np);
+ if (IS_ERR(map))
+ return PTR_ERR(map);
+
+ tcu = kzalloc(sizeof(*tcu), GFP_KERNEL);
+ if (!tcu)
+ return -ENOMEM;
+
+ tcu->map = map;
+
+ irqs = of_property_count_elems_of_size(np, "interrupts", sizeof(u32));
+ if (irqs < 0 || irqs > ARRAY_SIZE(tcu->parent_irqs)) {
+ pr_crit("%s: Invalid 'interrupts' property\n", __func__);
+ ret = -EINVAL;
+ goto err_free_tcu;
+ }
+
+ tcu->nb_parent_irqs = irqs;
+
+ tcu->domain = irq_domain_add_linear(np, 32, &irq_generic_chip_ops,
+ NULL);
+ if (!tcu->domain) {
+ ret = -ENOMEM;
+ goto err_free_tcu;
+ }
+
+ ret = irq_alloc_domain_generic_chips(tcu->domain, 32, 1, "TCU",
+ handle_level_irq, 0,
+ IRQ_NOPROBE | IRQ_LEVEL, 0);
+ if (ret) {
+ pr_crit("%s: Invalid 'interrupts' property\n", __func__);
+ goto out_domain_remove;
+ }
+
+ gc = irq_get_domain_generic_chip(tcu->domain, 0);
+ ct = gc->chip_types;
+
+ gc->wake_enabled = IRQ_MSK(32);
+ gc->private = tcu->map;
+
+ ct->regs.disable = TCU_REG_TMSR;
+ ct->regs.enable = TCU_REG_TMCR;
+ ct->regs.ack = TCU_REG_TFCR;
+ ct->chip.irq_unmask = ingenic_tcu_gc_unmask_enable_reg;
+ ct->chip.irq_mask = ingenic_tcu_gc_mask_disable_reg;
+ ct->chip.irq_mask_ack = ingenic_tcu_gc_mask_disable_reg_and_ack;
+ ct->chip.flags = IRQCHIP_MASK_ON_SUSPEND | IRQCHIP_SKIP_SET_WAKE;
+
+ /* Mask all IRQs by default */
+ regmap_write(tcu->map, TCU_REG_TMSR, IRQ_MSK(32));
+
+ /*
+ * On JZ4740, timer 0 and timer 1 have their own interrupt line;
+ * timers 2-7 share one interrupt.
+ * On SoCs >= JZ4770, timer 5 has its own interrupt line;
+ * timers 0-4 and 6-7 share one single interrupt.
+ *
+ * To keep things simple, we just register the same handler to
+ * all parent interrupts. The handler will properly detect which
+ * channel fired the interrupt.
+ */
+ for (i = 0; i < irqs; i++) {
+ tcu->parent_irqs[i] = irq_of_parse_and_map(np, i);
+ if (!tcu->parent_irqs[i]) {
+ ret = -EINVAL;
+ goto out_unmap_irqs;
+ }
+
+ irq_set_chained_handler_and_data(tcu->parent_irqs[i],
+ ingenic_tcu_intc_cascade,
+ tcu->domain);
+ }
+
+ return 0;
+
+out_unmap_irqs:
+ for (; i > 0; i--)
+ irq_dispose_mapping(tcu->parent_irqs[i - 1]);
+out_domain_remove:
+ irq_domain_remove(tcu->domain);
+err_free_tcu:
+ kfree(tcu);
+ return ret;
+}
+IRQCHIP_DECLARE(jz4740_tcu_irq, "ingenic,jz4740-tcu", ingenic_tcu_irq_init);
+IRQCHIP_DECLARE(jz4725b_tcu_irq, "ingenic,jz4725b-tcu", ingenic_tcu_irq_init);
+IRQCHIP_DECLARE(jz4770_tcu_irq, "ingenic,jz4770-tcu", ingenic_tcu_irq_init);
--
2.21.0.593.g511ec345e18
^ permalink raw reply related
* [PATCH v14 09/13] MIPS: jz4740: Add DTS nodes for the TCU drivers
From: Paul Cercueil @ 2019-07-01 15:14 UTC (permalink / raw)
To: Lee Jones, Jonathan Corbet, Ralf Baechle, Paul Burton,
James Hogan, Michael Turquette, Stephen Boyd, Thomas Gleixner,
Daniel Lezcano
Cc: Mathieu Malaterre, od, devicetree, linux-kernel, linux-doc,
linux-mips, linux-clk, Paul Cercueil, Artur Rojek
In-Reply-To: <20190701151410.23127-1-paul@crapouillou.net>
Add DTS nodes for the JZ4780, JZ4770 and JZ4740 devicetree files.
Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Tested-by: Mathieu Malaterre <malat@debian.org>
Tested-by: Artur Rojek <contact@artur-rojek.eu>
---
Notes:
v5: New patch
v6: Fix register lengths in watchdog/pwm nodes
v7: No change
v8: - Fix wrong start address for PWM node
- Add system timer and clocksource sub-nodes
v9: Drop timer and clocksource sub-nodes
v10-v11: No change
v12: Drop PWM/watchdog/OST sub-nodes, for now.
v13-v14: No change
arch/mips/boot/dts/ingenic/jz4740.dtsi | 22 ++++++++++++++++++++++
arch/mips/boot/dts/ingenic/jz4770.dtsi | 21 +++++++++++++++++++++
arch/mips/boot/dts/ingenic/jz4780.dtsi | 21 +++++++++++++++++++++
3 files changed, 64 insertions(+)
diff --git a/arch/mips/boot/dts/ingenic/jz4740.dtsi b/arch/mips/boot/dts/ingenic/jz4740.dtsi
index 2beb78a62b7d..807d9702d4cf 100644
--- a/arch/mips/boot/dts/ingenic/jz4740.dtsi
+++ b/arch/mips/boot/dts/ingenic/jz4740.dtsi
@@ -53,6 +53,28 @@
clock-names = "rtc";
};
+ tcu: timer@10002000 {
+ compatible = "ingenic,jz4740-tcu";
+ reg = <0x10002000 0x1000>;
+ #address-cells = <1>;
+ #size-cells = <1>;
+ ranges = <0x0 0x10002000 0x1000>;
+
+ #clock-cells = <1>;
+
+ clocks = <&cgu JZ4740_CLK_RTC
+ &cgu JZ4740_CLK_EXT
+ &cgu JZ4740_CLK_PCLK
+ &cgu JZ4740_CLK_TCU>;
+ clock-names = "rtc", "ext", "pclk", "tcu";
+
+ interrupt-controller;
+ #interrupt-cells = <1>;
+
+ interrupt-parent = <&intc>;
+ interrupts = <23 22 21>;
+ };
+
rtc_dev: rtc@10003000 {
compatible = "ingenic,jz4740-rtc";
reg = <0x10003000 0x40>;
diff --git a/arch/mips/boot/dts/ingenic/jz4770.dtsi b/arch/mips/boot/dts/ingenic/jz4770.dtsi
index 49ede6c14ff3..70932fd90902 100644
--- a/arch/mips/boot/dts/ingenic/jz4770.dtsi
+++ b/arch/mips/boot/dts/ingenic/jz4770.dtsi
@@ -46,6 +46,27 @@
#clock-cells = <1>;
};
+ tcu: timer@10002000 {
+ compatible = "ingenic,jz4770-tcu";
+ reg = <0x10002000 0x1000>;
+ #address-cells = <1>;
+ #size-cells = <1>;
+ ranges = <0x0 0x10002000 0x1000>;
+
+ #clock-cells = <1>;
+
+ clocks = <&cgu JZ4770_CLK_RTC
+ &cgu JZ4770_CLK_EXT
+ &cgu JZ4770_CLK_PCLK>;
+ clock-names = "rtc", "ext", "pclk";
+
+ interrupt-controller;
+ #interrupt-cells = <1>;
+
+ interrupt-parent = <&intc>;
+ interrupts = <27 26 25>;
+ };
+
pinctrl: pin-controller@10010000 {
compatible = "ingenic,jz4770-pinctrl";
reg = <0x10010000 0x600>;
diff --git a/arch/mips/boot/dts/ingenic/jz4780.dtsi b/arch/mips/boot/dts/ingenic/jz4780.dtsi
index b03cdec56de9..495082ce7fc5 100644
--- a/arch/mips/boot/dts/ingenic/jz4780.dtsi
+++ b/arch/mips/boot/dts/ingenic/jz4780.dtsi
@@ -46,6 +46,27 @@
#clock-cells = <1>;
};
+ tcu: timer@10002000 {
+ compatible = "ingenic,jz4770-tcu";
+ reg = <0x10002000 0x1000>;
+ #address-cells = <1>;
+ #size-cells = <1>;
+ ranges = <0x0 0x10002000 0x1000>;
+
+ #clock-cells = <1>;
+
+ clocks = <&cgu JZ4780_CLK_RTCLK
+ &cgu JZ4780_CLK_EXCLK
+ &cgu JZ4780_CLK_PCLK>;
+ clock-names = "rtc", "ext", "pclk";
+
+ interrupt-controller;
+ #interrupt-cells = <1>;
+
+ interrupt-parent = <&intc>;
+ interrupts = <27 26 25>;
+ };
+
rtc_dev: rtc@10003000 {
compatible = "ingenic,jz4780-rtc";
reg = <0x10003000 0x4c>;
--
2.21.0.593.g511ec345e18
^ permalink raw reply related
* [PATCH v14 13/13] MIPS: jz4740: Drop obsolete code
From: Paul Cercueil @ 2019-07-01 15:14 UTC (permalink / raw)
To: Lee Jones, Jonathan Corbet, Ralf Baechle, Paul Burton,
James Hogan, Michael Turquette, Stephen Boyd, Thomas Gleixner,
Daniel Lezcano
Cc: Mathieu Malaterre, od, devicetree, linux-kernel, linux-doc,
linux-mips, linux-clk, Paul Cercueil, Artur Rojek
In-Reply-To: <20190701151410.23127-1-paul@crapouillou.net>
The old clocksource/timer platform code is now obsoleted by the newly
introduced TCU drivers.
Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Tested-by: Mathieu Malaterre <malat@debian.org>
Tested-by: Artur Rojek <contact@artur-rojek.eu>
---
Notes:
v5: New patch
v6-v11: No change
v12: Only remove clocksource code. The rest will eventually be
removed in a future patchset when the PWM/watchdog drivers
are updated.
v13-v14: No change
arch/mips/jz4740/time.c | 154 +---------------------------------------
1 file changed, 2 insertions(+), 152 deletions(-)
diff --git a/arch/mips/jz4740/time.c b/arch/mips/jz4740/time.c
index a3260c754e65..5476899f0882 100644
--- a/arch/mips/jz4740/time.c
+++ b/arch/mips/jz4740/time.c
@@ -4,164 +4,14 @@
* JZ4740 platform time support
*/
-#include <linux/clk.h>
#include <linux/clk-provider.h>
-#include <linux/interrupt.h>
-#include <linux/kernel.h>
-#include <linux/time.h>
+#include <linux/clocksource.h>
-#include <linux/clockchips.h>
-#include <linux/sched_clock.h>
-
-#include <asm/mach-jz4740/clock.h>
-#include <asm/mach-jz4740/irq.h>
#include <asm/mach-jz4740/timer.h>
-#include <asm/time.h>
-
-#include "clock.h"
-
-#define TIMER_CLOCKEVENT 0
-#define TIMER_CLOCKSOURCE 1
-
-static uint16_t jz4740_jiffies_per_tick;
-
-static u64 jz4740_clocksource_read(struct clocksource *cs)
-{
- return jz4740_timer_get_count(TIMER_CLOCKSOURCE);
-}
-
-static struct clocksource jz4740_clocksource = {
- .name = "jz4740-timer",
- .rating = 200,
- .read = jz4740_clocksource_read,
- .mask = CLOCKSOURCE_MASK(16),
- .flags = CLOCK_SOURCE_IS_CONTINUOUS,
-};
-
-static u64 notrace jz4740_read_sched_clock(void)
-{
- return jz4740_timer_get_count(TIMER_CLOCKSOURCE);
-}
-
-static irqreturn_t jz4740_clockevent_irq(int irq, void *devid)
-{
- struct clock_event_device *cd = devid;
-
- jz4740_timer_ack_full(TIMER_CLOCKEVENT);
-
- if (!clockevent_state_periodic(cd))
- jz4740_timer_disable(TIMER_CLOCKEVENT);
-
- cd->event_handler(cd);
-
- return IRQ_HANDLED;
-}
-
-static int jz4740_clockevent_set_periodic(struct clock_event_device *evt)
-{
- jz4740_timer_set_count(TIMER_CLOCKEVENT, 0);
- jz4740_timer_set_period(TIMER_CLOCKEVENT, jz4740_jiffies_per_tick);
- jz4740_timer_irq_full_enable(TIMER_CLOCKEVENT);
- jz4740_timer_enable(TIMER_CLOCKEVENT);
-
- return 0;
-}
-
-static int jz4740_clockevent_resume(struct clock_event_device *evt)
-{
- jz4740_timer_irq_full_enable(TIMER_CLOCKEVENT);
- jz4740_timer_enable(TIMER_CLOCKEVENT);
-
- return 0;
-}
-
-static int jz4740_clockevent_shutdown(struct clock_event_device *evt)
-{
- jz4740_timer_disable(TIMER_CLOCKEVENT);
-
- return 0;
-}
-
-static int jz4740_clockevent_set_next(unsigned long evt,
- struct clock_event_device *cd)
-{
- jz4740_timer_set_count(TIMER_CLOCKEVENT, 0);
- jz4740_timer_set_period(TIMER_CLOCKEVENT, evt);
- jz4740_timer_enable(TIMER_CLOCKEVENT);
-
- return 0;
-}
-
-static struct clock_event_device jz4740_clockevent = {
- .name = "jz4740-timer",
- .features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
- .set_next_event = jz4740_clockevent_set_next,
- .set_state_shutdown = jz4740_clockevent_shutdown,
- .set_state_periodic = jz4740_clockevent_set_periodic,
- .set_state_oneshot = jz4740_clockevent_shutdown,
- .tick_resume = jz4740_clockevent_resume,
- .rating = 200,
-#ifdef CONFIG_MACH_JZ4740
- .irq = JZ4740_IRQ_TCU0,
-#endif
-#if defined(CONFIG_MACH_JZ4770) || defined(CONFIG_MACH_JZ4780)
- .irq = JZ4780_IRQ_TCU2,
-#endif
-};
-
-static struct irqaction timer_irqaction = {
- .handler = jz4740_clockevent_irq,
- .flags = IRQF_PERCPU | IRQF_TIMER,
- .name = "jz4740-timerirq",
- .dev_id = &jz4740_clockevent,
-};
void __init plat_time_init(void)
{
- int ret;
- uint32_t clk_rate;
- uint16_t ctrl;
- struct clk *ext_clk;
-
of_clk_init(NULL);
jz4740_timer_init();
-
- ext_clk = clk_get(NULL, "ext");
- if (IS_ERR(ext_clk))
- panic("unable to get ext clock");
- clk_rate = clk_get_rate(ext_clk) >> 4;
- clk_put(ext_clk);
-
- jz4740_jiffies_per_tick = DIV_ROUND_CLOSEST(clk_rate, HZ);
-
- clockevent_set_clock(&jz4740_clockevent, clk_rate);
- jz4740_clockevent.min_delta_ns = clockevent_delta2ns(100, &jz4740_clockevent);
- jz4740_clockevent.min_delta_ticks = 100;
- jz4740_clockevent.max_delta_ns = clockevent_delta2ns(0xffff, &jz4740_clockevent);
- jz4740_clockevent.max_delta_ticks = 0xffff;
- jz4740_clockevent.cpumask = cpumask_of(0);
-
- clockevents_register_device(&jz4740_clockevent);
-
- ret = clocksource_register_hz(&jz4740_clocksource, clk_rate);
-
- if (ret)
- printk(KERN_ERR "Failed to register clocksource: %d\n", ret);
-
- sched_clock_register(jz4740_read_sched_clock, 16, clk_rate);
-
- setup_irq(jz4740_clockevent.irq, &timer_irqaction);
-
- ctrl = JZ_TIMER_CTRL_PRESCALE_16 | JZ_TIMER_CTRL_SRC_EXT;
-
- jz4740_timer_set_ctrl(TIMER_CLOCKEVENT, ctrl);
- jz4740_timer_set_ctrl(TIMER_CLOCKSOURCE, ctrl);
-
- jz4740_timer_set_period(TIMER_CLOCKEVENT, jz4740_jiffies_per_tick);
- jz4740_timer_irq_full_enable(TIMER_CLOCKEVENT);
-
- jz4740_timer_set_period(TIMER_CLOCKSOURCE, 0xffff);
-
- jz4740_timer_enable(TIMER_CLOCKEVENT);
- jz4740_timer_enable(TIMER_CLOCKSOURCE);
+ timer_probe();
}
--
2.21.0.593.g511ec345e18
^ permalink raw reply related
* [PATCH v14 12/13] MIPS: GCW0: Reduce system timer and clocksource to 750 kHz
From: Paul Cercueil @ 2019-07-01 15:14 UTC (permalink / raw)
To: Lee Jones, Jonathan Corbet, Ralf Baechle, Paul Burton,
James Hogan, Michael Turquette, Stephen Boyd, Thomas Gleixner,
Daniel Lezcano
Cc: Mathieu Malaterre, od, devicetree, linux-kernel, linux-doc,
linux-mips, linux-clk, Paul Cercueil, Artur Rojek
In-Reply-To: <20190701151410.23127-1-paul@crapouillou.net>
The default clock (12 MHz) is too fast for the system timer.
Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Tested-by: Mathieu Malaterre <malat@debian.org>
Tested-by: Artur Rojek <contact@artur-rojek.eu>
---
Notes:
v8: New patch
v9: Don't configure clock timer1, as the OS Timer is used as
clocksource on this SoC
v10: Revert back to v8 bahaviour. Let the user choose what
clocksource should be used.
v11: No change
v12: Move clocksource to channel 2, as channel 1 is used as PWM
for the backlight.
v13-v14: No change
arch/mips/boot/dts/ingenic/gcw0.dts | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/arch/mips/boot/dts/ingenic/gcw0.dts b/arch/mips/boot/dts/ingenic/gcw0.dts
index 35f0291e8d38..f58d239c2058 100644
--- a/arch/mips/boot/dts/ingenic/gcw0.dts
+++ b/arch/mips/boot/dts/ingenic/gcw0.dts
@@ -2,6 +2,7 @@
/dts-v1/;
#include "jz4770.dtsi"
+#include <dt-bindings/clock/ingenic,tcu.h>
/ {
compatible = "gcw,zero", "ingenic,jz4770";
@@ -60,3 +61,12 @@
/* The WiFi module is connected to the UHC. */
status = "okay";
};
+
+&tcu {
+ /* 750 kHz for the system timer and clocksource */
+ assigned-clocks = <&tcu TCU_CLK_TIMER0>, <&tcu TCU_CLK_TIMER2>;
+ assigned-clock-rates = <750000>, <750000>;
+
+ /* PWM1 is in use, so reserve channel #2 for the clocksource */
+ ingenic,pwm-channels-mask = <0xfa>;
+};
--
2.21.0.593.g511ec345e18
^ permalink raw reply related
* [PATCH v14 11/13] MIPS: CI20: Reduce system timer and clocksource to 3 MHz
From: Paul Cercueil @ 2019-07-01 15:14 UTC (permalink / raw)
To: Lee Jones, Jonathan Corbet, Ralf Baechle, Paul Burton,
James Hogan, Michael Turquette, Stephen Boyd, Thomas Gleixner,
Daniel Lezcano
Cc: Mathieu Malaterre, od, devicetree, linux-kernel, linux-doc,
linux-mips, linux-clk, Paul Cercueil, Artur Rojek
In-Reply-To: <20190701151410.23127-1-paul@crapouillou.net>
The default clock (48 MHz) is too fast for the system timer.
Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Tested-by: Mathieu Malaterre <malat@debian.org>
Tested-by: Artur Rojek <contact@artur-rojek.eu>
---
Notes:
v5: New patch
v6: Set also the rate for the clocksource channel's clock
v7: No change
v8: No change
v9: Don't configure clock timer1, as the OS Timer is used as
clocksource on this SoC
v10: Revert back to v8 bahaviour. Let the user choose what
clocksource should be used.
v11-v14: No change
arch/mips/boot/dts/ingenic/ci20.dts | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/arch/mips/boot/dts/ingenic/ci20.dts b/arch/mips/boot/dts/ingenic/ci20.dts
index 4f7b1fa31cf5..2e9952311ecd 100644
--- a/arch/mips/boot/dts/ingenic/ci20.dts
+++ b/arch/mips/boot/dts/ingenic/ci20.dts
@@ -2,6 +2,7 @@
/dts-v1/;
#include "jz4780.dtsi"
+#include <dt-bindings/clock/ingenic,tcu.h>
#include <dt-bindings/gpio/gpio.h>
/ {
@@ -238,3 +239,9 @@
bias-disable;
};
};
+
+&tcu {
+ /* 3 MHz for the system timer and clocksource */
+ assigned-clocks = <&tcu TCU_CLK_TIMER0>, <&tcu TCU_CLK_TIMER1>;
+ assigned-clock-rates = <3000000>, <3000000>;
+};
--
2.21.0.593.g511ec345e18
^ permalink raw reply related
* [PATCH v14 10/13] MIPS: qi_lb60: Reduce system timer and clocksource to 750 kHz
From: Paul Cercueil @ 2019-07-01 15:14 UTC (permalink / raw)
To: Lee Jones, Jonathan Corbet, Ralf Baechle, Paul Burton,
James Hogan, Michael Turquette, Stephen Boyd, Thomas Gleixner,
Daniel Lezcano
Cc: Mathieu Malaterre, od, devicetree, linux-kernel, linux-doc,
linux-mips, linux-clk, Paul Cercueil, Artur Rojek
In-Reply-To: <20190701151410.23127-1-paul@crapouillou.net>
The default clock (12 MHz) is too fast for the system timer, which fails
to report time accurately.
Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Tested-by: Mathieu Malaterre <malat@debian.org>
Tested-by: Artur Rojek <contact@artur-rojek.eu>
---
Notes:
v5: New patch
v6: Remove ingenic,clocksource-channel property
v7-v14: No change
arch/mips/boot/dts/ingenic/qi_lb60.dts | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/arch/mips/boot/dts/ingenic/qi_lb60.dts b/arch/mips/boot/dts/ingenic/qi_lb60.dts
index 76aaf8982554..01b8c917cb33 100644
--- a/arch/mips/boot/dts/ingenic/qi_lb60.dts
+++ b/arch/mips/boot/dts/ingenic/qi_lb60.dts
@@ -2,6 +2,7 @@
/dts-v1/;
#include "jz4740.dtsi"
+#include <dt-bindings/clock/ingenic,tcu.h>
/ {
compatible = "qi,lb60", "ingenic,jz4740";
@@ -31,3 +32,9 @@
bias-disable;
};
};
+
+&tcu {
+ /* 750 kHz for the system timer and clocksource */
+ assigned-clocks = <&tcu TCU_CLK_TIMER0>, <&tcu TCU_CLK_TIMER1>;
+ assigned-clock-rates = <750000>, <750000>;
+};
--
2.21.0.593.g511ec345e18
^ permalink raw reply related
* [PATCH v14 08/13] clk: jz4740: Add TCU clock
From: Paul Cercueil @ 2019-07-01 15:14 UTC (permalink / raw)
To: Lee Jones, Jonathan Corbet, Ralf Baechle, Paul Burton,
James Hogan, Michael Turquette, Stephen Boyd, Thomas Gleixner,
Daniel Lezcano
Cc: Mathieu Malaterre, od, devicetree, linux-kernel, linux-doc,
linux-mips, linux-clk, Paul Cercueil, Artur Rojek, Rob Herring
In-Reply-To: <20190701151410.23127-1-paul@crapouillou.net>
Add the missing TCU clock to the list of clocks supplied by the CGU for
the JZ4740 SoC.
Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Tested-by: Mathieu Malaterre <malat@debian.org>
Tested-by: Artur Rojek <contact@artur-rojek.eu>
Acked-by: Stephen Boyd <sboyd@kernel.org>
Acked-by: Rob Herring <robh@kernel.org>
---
Notes:
v5: New patch
v6-v14: No change
drivers/clk/ingenic/jz4740-cgu.c | 6 ++++++
include/dt-bindings/clock/jz4740-cgu.h | 1 +
2 files changed, 7 insertions(+)
diff --git a/drivers/clk/ingenic/jz4740-cgu.c b/drivers/clk/ingenic/jz4740-cgu.c
index c77f4e1506dc..176d911b5839 100644
--- a/drivers/clk/ingenic/jz4740-cgu.c
+++ b/drivers/clk/ingenic/jz4740-cgu.c
@@ -203,6 +203,12 @@ static const struct ingenic_cgu_clk_info jz4740_cgu_clocks[] = {
.parents = { JZ4740_CLK_EXT, -1, -1, -1 },
.gate = { CGU_REG_CLKGR, 5 },
},
+
+ [JZ4740_CLK_TCU] = {
+ "tcu", CGU_CLK_GATE,
+ .parents = { JZ4740_CLK_EXT, -1, -1, -1 },
+ .gate = { CGU_REG_CLKGR, 1 },
+ },
};
static void __init jz4740_cgu_init(struct device_node *np)
diff --git a/include/dt-bindings/clock/jz4740-cgu.h b/include/dt-bindings/clock/jz4740-cgu.h
index 6ed83f926ae7..e82d77028581 100644
--- a/include/dt-bindings/clock/jz4740-cgu.h
+++ b/include/dt-bindings/clock/jz4740-cgu.h
@@ -34,5 +34,6 @@
#define JZ4740_CLK_ADC 19
#define JZ4740_CLK_I2C 20
#define JZ4740_CLK_AIC 21
+#define JZ4740_CLK_TCU 22
#endif /* __DT_BINDINGS_CLOCK_JZ4740_CGU_H__ */
--
2.21.0.593.g511ec345e18
^ permalink raw reply related
* [PATCH v14 07/13] clocksource: Add a new timer-ingenic driver
From: Paul Cercueil @ 2019-07-01 15:14 UTC (permalink / raw)
To: Lee Jones, Jonathan Corbet, Ralf Baechle, Paul Burton,
James Hogan, Michael Turquette, Stephen Boyd, Thomas Gleixner,
Daniel Lezcano
Cc: Mathieu Malaterre, od, devicetree, linux-kernel, linux-doc,
linux-mips, linux-clk, Paul Cercueil, Artur Rojek
In-Reply-To: <20190701151410.23127-1-paul@crapouillou.net>
This driver handles the TCU (Timer Counter Unit) present on the Ingenic
JZ47xx SoCs, and provides the kernel with a system timer, a clocksource
and a sched_clock.
Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Tested-by: Mathieu Malaterre <malat@debian.org>
Tested-by: Artur Rojek <contact@artur-rojek.eu>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
---
Notes:
v2: Use SPDX identifier for the license
v3: - Move documentation to its own patch
- Search the devicetree for PWM clients, and use all the TCU
channels that won't be used for PWM
v4: - Add documentation about why we search for PWM clients
- Verify that the PWM clients are for the TCU PWM driver
v5: Major overhaul. Too many changes to list. Consider it's a new
patch.
v6: - Add two API functions ingenic_tcu_request_channel and
ingenic_tcu_release_channel. To be used by the PWM driver to
request the use of a TCU channel. The driver will now dynamically
move away the system timer or clocksource to a new TCU channel.
- The system timer now defaults to channel 0, the clocksource now
defaults to channel 1 and is no more optional. The
ingenic,timer-channel and ingenic,clocksource-channel devicetree
properties are now gone.
- Fix round_rate / set_rate not calculating the prescale divider
the same way. This caused problems when (parent_rate / div) would
give a non-integer result. The behaviour is correct now.
- The clocksource clock is turned off on suspend now.
v7: Fix section mismatch by using builtin_platform_driver_probe()
v8: - Removed ingenic_tcu_[request,release]_channel, and the mechanism
to dynamically change the TCU channel of the system timer or
the clocksource.
- The driver's devicetree node can now have two more children
nodes, that correspond to the system timer and clocksource.
For these two, the driver will use the TCU timer that
correspond to the memory resource supplied in their
respective node.
v9: - Removed support for clocksource / timer children devicetree
nodes. Now, we use a property "ingenic,pwm-channels-mask" to
know which PWM channels are reserved for PWM use and should
not be used as OS timers.
v10: - Use CLK_SET_RATE_UNGATE instead of CLK_SET_RATE_GATE + manually
un-gating the clock before changing rate. Same for re-parenting.
- Unconditionally create the clocksource and sched_clock even if
the SoC possesses a OS Timer. That gives the choice back to the
user which clocksource should be selected.
- Use subsys_initcall() instead of builtin_platform_driver_probe().
The OS Timer driver calls builtin_platform_driver_probe, which
requires the device to be created before that.
- Cosmetic cleanups
v11: - Change prototype of exported function
ingenic_tcu_pwm_can_use_chn(), use a struct device * as first
argument.
- Read clocksource using the regmap instead of bypassing it.
Bypassing the regmap makes sense only for the sched_clock where
the read operation must be as fast as possible.
- Fix incorrect format in pr_crit() macro
v12: - Clock handling and IRQ handling are gone, and are now handled
in their own driver.
- Obtain regmap from the ingenic-tcu MFD driver. As a result, we
cannot bypass the regmap anymore for the sched_clock.
v13: No change
v14: Remove empty lines in structure definitions
drivers/clocksource/Kconfig | 11 +
drivers/clocksource/Makefile | 1 +
drivers/clocksource/ingenic-timer.c | 355 ++++++++++++++++++++++++++++
3 files changed, 367 insertions(+)
create mode 100644 drivers/clocksource/ingenic-timer.c
diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig
index 3300739edce4..2d911c15db70 100644
--- a/drivers/clocksource/Kconfig
+++ b/drivers/clocksource/Kconfig
@@ -673,4 +673,15 @@ config MILBEAUT_TIMER
help
Enables the support for Milbeaut timer driver.
+config INGENIC_TIMER
+ bool "Clocksource/timer using the TCU in Ingenic JZ SoCs"
+ default MACH_INGENIC
+ depends on MIPS || COMPILE_TEST
+ depends on COMMON_CLK
+ select INGENIC_TCU
+ select TIMER_OF
+ select IRQ_DOMAIN
+ help
+ Support for the timer/counter unit of the Ingenic JZ SoCs.
+
endmenu
diff --git a/drivers/clocksource/Makefile b/drivers/clocksource/Makefile
index 236858fa7fbf..553f3c61717a 100644
--- a/drivers/clocksource/Makefile
+++ b/drivers/clocksource/Makefile
@@ -78,6 +78,7 @@ obj-$(CONFIG_ASM9260_TIMER) += asm9260_timer.o
obj-$(CONFIG_H8300_TMR8) += h8300_timer8.o
obj-$(CONFIG_H8300_TMR16) += h8300_timer16.o
obj-$(CONFIG_H8300_TPU) += h8300_tpu.o
+obj-$(CONFIG_INGENIC_TIMER) += ingenic-timer.o
obj-$(CONFIG_CLKSRC_ST_LPC) += clksrc_st_lpc.o
obj-$(CONFIG_X86_NUMACHIP) += numachip.o
obj-$(CONFIG_ATCPIT100_TIMER) += timer-atcpit100.o
diff --git a/drivers/clocksource/ingenic-timer.c b/drivers/clocksource/ingenic-timer.c
new file mode 100644
index 000000000000..f3b4d55b46fd
--- /dev/null
+++ b/drivers/clocksource/ingenic-timer.c
@@ -0,0 +1,355 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * JZ47xx SoCs TCU IRQ driver
+ * Copyright (C) 2019 Paul Cercueil <paul@crapouillou.net>
+ */
+
+#include <linux/bitops.h>
+#include <linux/clk.h>
+#include <linux/clockchips.h>
+#include <linux/clocksource.h>
+#include <linux/interrupt.h>
+#include <linux/mfd/ingenic-tcu.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/sched_clock.h>
+
+#include <dt-bindings/clock/ingenic,tcu.h>
+
+struct ingenic_soc_info {
+ unsigned int num_channels;
+};
+
+struct ingenic_tcu {
+ struct regmap *map;
+ struct clk *timer_clk, *cs_clk;
+ unsigned int timer_channel, cs_channel;
+ struct clock_event_device cevt;
+ struct clocksource cs;
+ char name[4];
+ unsigned long pwm_channels_mask;
+};
+
+static struct ingenic_tcu *ingenic_tcu;
+
+static u64 notrace ingenic_tcu_timer_read(void)
+{
+ struct ingenic_tcu *tcu = ingenic_tcu;
+ unsigned int count;
+
+ regmap_read(tcu->map, TCU_REG_TCNTc(tcu->cs_channel), &count);
+
+ return count;
+}
+
+static u64 notrace ingenic_tcu_timer_cs_read(struct clocksource *cs)
+{
+ return ingenic_tcu_timer_read();
+}
+
+static inline struct ingenic_tcu *to_ingenic_tcu(struct clock_event_device *evt)
+{
+ return container_of(evt, struct ingenic_tcu, cevt);
+}
+
+static int ingenic_tcu_cevt_set_state_shutdown(struct clock_event_device *evt)
+{
+ struct ingenic_tcu *tcu = to_ingenic_tcu(evt);
+
+ regmap_write(tcu->map, TCU_REG_TECR, BIT(tcu->timer_channel));
+
+ return 0;
+}
+
+static int ingenic_tcu_cevt_set_next(unsigned long next,
+ struct clock_event_device *evt)
+{
+ struct ingenic_tcu *tcu = to_ingenic_tcu(evt);
+
+ if (next > 0xffff)
+ return -EINVAL;
+
+ regmap_write(tcu->map, TCU_REG_TDFRc(tcu->timer_channel), next);
+ regmap_write(tcu->map, TCU_REG_TCNTc(tcu->timer_channel), 0);
+ regmap_write(tcu->map, TCU_REG_TESR, BIT(tcu->timer_channel));
+
+ return 0;
+}
+
+static irqreturn_t ingenic_tcu_cevt_cb(int irq, void *dev_id)
+{
+ struct clock_event_device *evt = dev_id;
+ struct ingenic_tcu *tcu = to_ingenic_tcu(evt);
+
+ regmap_write(tcu->map, TCU_REG_TECR, BIT(tcu->timer_channel));
+
+ if (evt->event_handler)
+ evt->event_handler(evt);
+
+ return IRQ_HANDLED;
+}
+
+static struct clk * __init ingenic_tcu_get_clock(struct device_node *np, int id)
+{
+ struct of_phandle_args args;
+
+ args.np = np;
+ args.args_count = 1;
+ args.args[0] = id;
+
+ return of_clk_get_from_provider(&args);
+}
+
+static int __init ingenic_tcu_timer_init(struct device_node *np,
+ struct ingenic_tcu *tcu)
+{
+ unsigned int timer_virq, channel = tcu->timer_channel;
+ struct irq_domain *domain;
+ unsigned long rate;
+ int err;
+
+ tcu->timer_clk = ingenic_tcu_get_clock(np, channel);
+ if (IS_ERR(tcu->timer_clk))
+ return PTR_ERR(tcu->timer_clk);
+
+ err = clk_prepare_enable(tcu->timer_clk);
+ if (err)
+ goto err_clk_put;
+
+ rate = clk_get_rate(tcu->timer_clk);
+ if (!rate) {
+ err = -EINVAL;
+ goto err_clk_disable;
+ }
+
+ domain = irq_find_host(np);
+ if (!domain) {
+ err = -ENODEV;
+ goto err_clk_disable;
+ }
+
+ timer_virq = irq_create_mapping(domain, channel);
+ if (!timer_virq) {
+ err = -EINVAL;
+ goto err_clk_disable;
+ }
+
+ snprintf(tcu->name, sizeof(tcu->name), "TCU");
+
+ err = request_irq(timer_virq, ingenic_tcu_cevt_cb, IRQF_TIMER,
+ tcu->name, &tcu->cevt);
+ if (err)
+ goto err_irq_dispose_mapping;
+
+ tcu->cevt.cpumask = cpumask_of(smp_processor_id());
+ tcu->cevt.features = CLOCK_EVT_FEAT_ONESHOT;
+ tcu->cevt.name = tcu->name;
+ tcu->cevt.rating = 200;
+ tcu->cevt.set_state_shutdown = ingenic_tcu_cevt_set_state_shutdown;
+ tcu->cevt.set_next_event = ingenic_tcu_cevt_set_next;
+
+ clockevents_config_and_register(&tcu->cevt, rate, 10, 0xffff);
+
+ return 0;
+
+err_irq_dispose_mapping:
+ irq_dispose_mapping(timer_virq);
+err_clk_disable:
+ clk_disable_unprepare(tcu->timer_clk);
+err_clk_put:
+ clk_put(tcu->timer_clk);
+ return err;
+}
+
+static int __init ingenic_tcu_clocksource_init(struct device_node *np,
+ struct ingenic_tcu *tcu)
+{
+ unsigned int channel = tcu->cs_channel;
+ struct clocksource *cs = &tcu->cs;
+ unsigned long rate;
+ int err;
+
+ tcu->cs_clk = ingenic_tcu_get_clock(np, channel);
+ if (IS_ERR(tcu->cs_clk))
+ return PTR_ERR(tcu->cs_clk);
+
+ err = clk_prepare_enable(tcu->cs_clk);
+ if (err)
+ goto err_clk_put;
+
+ rate = clk_get_rate(tcu->cs_clk);
+ if (!rate) {
+ err = -EINVAL;
+ goto err_clk_disable;
+ }
+
+ /* Reset channel */
+ regmap_update_bits(tcu->map, TCU_REG_TCSRc(channel),
+ 0xffff & ~TCU_TCSR_RESERVED_BITS, 0);
+
+ /* Reset counter */
+ regmap_write(tcu->map, TCU_REG_TDFRc(channel), 0xffff);
+ regmap_write(tcu->map, TCU_REG_TCNTc(channel), 0);
+
+ /* Enable channel */
+ regmap_write(tcu->map, TCU_REG_TESR, BIT(channel));
+
+ cs->name = "ingenic-timer";
+ cs->rating = 200;
+ cs->flags = CLOCK_SOURCE_IS_CONTINUOUS;
+ cs->mask = CLOCKSOURCE_MASK(16);
+ cs->read = ingenic_tcu_timer_cs_read;
+
+ err = clocksource_register_hz(cs, rate);
+ if (err)
+ goto err_clk_disable;
+
+ return 0;
+
+err_clk_disable:
+ clk_disable_unprepare(tcu->cs_clk);
+err_clk_put:
+ clk_put(tcu->cs_clk);
+ return err;
+}
+
+static const struct ingenic_soc_info jz4740_soc_info = {
+ .num_channels = 8,
+};
+
+static const struct ingenic_soc_info jz4725b_soc_info = {
+ .num_channels = 6,
+};
+
+static const struct of_device_id ingenic_tcu_of_match[] = {
+ { .compatible = "ingenic,jz4740-tcu", .data = &jz4740_soc_info, },
+ { .compatible = "ingenic,jz4725b-tcu", .data = &jz4725b_soc_info, },
+ { .compatible = "ingenic,jz4770-tcu", .data = &jz4740_soc_info, },
+ { }
+};
+
+static int __init ingenic_tcu_init(struct device_node *np)
+{
+ const struct of_device_id *id = of_match_node(ingenic_tcu_of_match, np);
+ const struct ingenic_soc_info *soc_info = id->data;
+ struct ingenic_tcu *tcu;
+ struct regmap *map;
+ long rate;
+ int ret;
+
+ of_node_clear_flag(np, OF_POPULATED);
+
+ map = ingenic_tcu_get_regmap(np);
+ if (IS_ERR(map))
+ return PTR_ERR(map);
+
+ tcu = kzalloc(sizeof(*tcu), GFP_KERNEL);
+ if (!tcu)
+ return -ENOMEM;
+
+ /* Enable all TCU channels for PWM use by default except channels 0/1 */
+ tcu->pwm_channels_mask = GENMASK(soc_info->num_channels - 1, 2);
+ of_property_read_u32(np, "ingenic,pwm-channels-mask",
+ (u32 *)&tcu->pwm_channels_mask);
+
+ /* Verify that we have at least two free channels */
+ if (hweight8(tcu->pwm_channels_mask) > soc_info->num_channels - 2) {
+ pr_crit("%s: Invalid PWM channel mask: 0x%02lx\n", __func__,
+ tcu->pwm_channels_mask);
+ ret = -EINVAL;
+ goto err_free_ingenic_tcu;
+ }
+
+ tcu->map = map;
+ ingenic_tcu = tcu;
+
+ tcu->timer_channel = find_first_zero_bit(&tcu->pwm_channels_mask,
+ soc_info->num_channels);
+ tcu->cs_channel = find_next_zero_bit(&tcu->pwm_channels_mask,
+ soc_info->num_channels,
+ tcu->timer_channel + 1);
+
+ ret = ingenic_tcu_clocksource_init(np, tcu);
+ if (ret) {
+ pr_crit("%s: Unable to init clocksource: %d\n", __func__, ret);
+ goto err_free_ingenic_tcu;
+ }
+
+ ret = ingenic_tcu_timer_init(np, tcu);
+ if (ret)
+ goto err_tcu_clocksource_cleanup;
+
+ /* Register the sched_clock at the end as there's no way to undo it */
+ rate = clk_get_rate(tcu->cs_clk);
+ sched_clock_register(ingenic_tcu_timer_read, 16, rate);
+
+ return 0;
+
+err_tcu_clocksource_cleanup:
+ clocksource_unregister(&tcu->cs);
+ clk_disable_unprepare(tcu->cs_clk);
+ clk_put(tcu->cs_clk);
+err_free_ingenic_tcu:
+ kfree(tcu);
+ return ret;
+}
+
+TIMER_OF_DECLARE(jz4740_tcu_intc, "ingenic,jz4740-tcu", ingenic_tcu_init);
+TIMER_OF_DECLARE(jz4725b_tcu_intc, "ingenic,jz4725b-tcu", ingenic_tcu_init);
+TIMER_OF_DECLARE(jz4770_tcu_intc, "ingenic,jz4770-tcu", ingenic_tcu_init);
+
+
+static int __init ingenic_tcu_probe(struct platform_device *pdev)
+{
+ platform_set_drvdata(pdev, ingenic_tcu);
+
+ return 0;
+}
+
+static int __maybe_unused ingenic_tcu_suspend(struct device *dev)
+{
+ struct ingenic_tcu *tcu = dev_get_drvdata(dev);
+
+ clk_disable(tcu->cs_clk);
+ clk_disable(tcu->timer_clk);
+ return 0;
+}
+
+static int __maybe_unused ingenic_tcu_resume(struct device *dev)
+{
+ struct ingenic_tcu *tcu = dev_get_drvdata(dev);
+ int ret;
+
+ ret = clk_enable(tcu->timer_clk);
+ if (ret)
+ return ret;
+
+ ret = clk_enable(tcu->cs_clk);
+ if (ret) {
+ clk_disable(tcu->timer_clk);
+ return ret;
+ }
+
+ return 0;
+}
+
+static const struct dev_pm_ops __maybe_unused ingenic_tcu_pm_ops = {
+ /* _noirq: We want the TCU clocks to be gated last / ungated first */
+ .suspend_noirq = ingenic_tcu_suspend,
+ .resume_noirq = ingenic_tcu_resume,
+};
+
+static struct platform_driver ingenic_tcu_driver = {
+ .driver = {
+ .name = "ingenic-tcu-timer",
+#ifdef CONFIG_PM_SLEEP
+ .pm = &ingenic_tcu_pm_ops,
+#endif
+ .of_match_table = ingenic_tcu_of_match,
+ },
+};
+builtin_platform_driver_probe(ingenic_tcu_driver, ingenic_tcu_probe);
--
2.21.0.593.g511ec345e18
^ permalink raw reply related
* [PATCH v14 01/13] dt-bindings: ingenic: Add DT bindings for TCU clocks
From: Paul Cercueil @ 2019-07-01 15:13 UTC (permalink / raw)
To: Lee Jones, Jonathan Corbet, Ralf Baechle, Paul Burton,
James Hogan, Michael Turquette, Stephen Boyd, Thomas Gleixner,
Daniel Lezcano
Cc: Mathieu Malaterre, od, devicetree, linux-kernel, linux-doc,
linux-mips, linux-clk, Paul Cercueil, Artur Rojek, Rob Herring
In-Reply-To: <20190701151410.23127-1-paul@crapouillou.net>
This header provides clock numbers for the ingenic,tcu
DT binding.
Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Tested-by: Mathieu Malaterre <malat@debian.org>
Tested-by: Artur Rojek <contact@artur-rojek.eu>
Reviewed-by: Rob Herring <robh@kernel.org>
Acked-by: Stephen Boyd <sboyd@kernel.org>
---
Notes:
v2: Use SPDX identifier for the license
v3/v4: No change
v5: s/JZ47*_/TCU_/ and dropped *_CLK_LAST defines
v6-v14: No change
include/dt-bindings/clock/ingenic,tcu.h | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
create mode 100644 include/dt-bindings/clock/ingenic,tcu.h
diff --git a/include/dt-bindings/clock/ingenic,tcu.h b/include/dt-bindings/clock/ingenic,tcu.h
new file mode 100644
index 000000000000..d569650a7945
--- /dev/null
+++ b/include/dt-bindings/clock/ingenic,tcu.h
@@ -0,0 +1,20 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * This header provides clock numbers for the ingenic,tcu DT binding.
+ */
+
+#ifndef __DT_BINDINGS_CLOCK_INGENIC_TCU_H__
+#define __DT_BINDINGS_CLOCK_INGENIC_TCU_H__
+
+#define TCU_CLK_TIMER0 0
+#define TCU_CLK_TIMER1 1
+#define TCU_CLK_TIMER2 2
+#define TCU_CLK_TIMER3 3
+#define TCU_CLK_TIMER4 4
+#define TCU_CLK_TIMER5 5
+#define TCU_CLK_TIMER6 6
+#define TCU_CLK_TIMER7 7
+#define TCU_CLK_WDT 8
+#define TCU_CLK_OST 9
+
+#endif /* __DT_BINDINGS_CLOCK_INGENIC_TCU_H__ */
--
2.21.0.593.g511ec345e18
^ permalink raw reply related
* [PATCH v14 04/13] mfd: Add Ingenic TCU driver
From: Paul Cercueil @ 2019-07-01 15:14 UTC (permalink / raw)
To: Lee Jones, Jonathan Corbet, Ralf Baechle, Paul Burton,
James Hogan, Michael Turquette, Stephen Boyd, Thomas Gleixner,
Daniel Lezcano
Cc: Mathieu Malaterre, od, devicetree, linux-kernel, linux-doc,
linux-mips, linux-clk, Paul Cercueil, Artur Rojek
In-Reply-To: <20190701151410.23127-1-paul@crapouillou.net>
This driver will provide a regmap that can be retrieved very early in
the boot process through the API function ingenic_tcu_get_regmap().
Additionally, it will call devm_of_platform_populate() so that all the
children devices will be probed.
Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Tested-by: Mathieu Malaterre <malat@debian.org>
Tested-by: Artur Rojek <contact@artur-rojek.eu>
Reviewed-by: Paul Burton <paul.burton@mips.com>
---
Notes:
v12: New patch
v13: No change
v14:
- Use ERR_CAST() instead of ERR_PTR(PTR_ERR())
- Remove ingenic_tcu_can_use_pwm(); it belongs in the PWM driver.
drivers/mfd/Kconfig | 8 +++
drivers/mfd/Makefile | 1 +
drivers/mfd/ingenic-tcu.c | 87 +++++++++++++++++++++++++++++++++
include/linux/mfd/ingenic-tcu.h | 6 +++
4 files changed, 102 insertions(+)
create mode 100644 drivers/mfd/ingenic-tcu.c
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index a17d275bf1d4..f3ed22613cbc 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -495,6 +495,14 @@ config HTC_I2CPLD
This device provides input and output GPIOs through an I2C
interface to one or more sub-chips.
+config INGENIC_TCU
+ bool "Ingenic Timer/Counter Unit (TCU) support"
+ depends on MIPS || COMPILE_TEST
+ select REGMAP_MMIO
+ help
+ Say yes here to support the Timer/Counter Unit (TCU) IP present
+ in the JZ47xx SoCs from Ingenic.
+
config MFD_INTEL_QUARK_I2C_GPIO
tristate "Intel Quark MFD I2C GPIO"
depends on PCI
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 52b1a90ff515..fb89e131ae98 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -180,6 +180,7 @@ obj-$(CONFIG_AB8500_CORE) += ab8500-core.o ab8500-sysctrl.o
obj-$(CONFIG_MFD_TIMBERDALE) += timberdale.o
obj-$(CONFIG_PMIC_ADP5520) += adp5520.o
obj-$(CONFIG_MFD_KEMPLD) += kempld-core.o
+obj-$(CONFIG_INGENIC_TCU) += ingenic-tcu.o
obj-$(CONFIG_MFD_INTEL_QUARK_I2C_GPIO) += intel_quark_i2c_gpio.o
obj-$(CONFIG_LPC_SCH) += lpc_sch.o
obj-$(CONFIG_LPC_ICH) += lpc_ich.o
diff --git a/drivers/mfd/ingenic-tcu.c b/drivers/mfd/ingenic-tcu.c
new file mode 100644
index 000000000000..2d12bebd5430
--- /dev/null
+++ b/drivers/mfd/ingenic-tcu.c
@@ -0,0 +1,87 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * JZ47xx SoCs TCU MFD driver
+ * Copyright (C) 2019 Paul Cercueil <paul@crapouillou.net>
+ */
+
+#include <linux/mfd/ingenic-tcu.h>
+#include <linux/of_address.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+
+static struct regmap *tcu_regmap __initdata;
+
+static const struct regmap_config ingenic_tcu_regmap_config = {
+ .reg_bits = 32,
+ .val_bits = 32,
+ .reg_stride = 4,
+ .max_register = TCU_REG_OST_CNTHBUF,
+};
+
+static const struct of_device_id ingenic_tcu_of_match[] = {
+ { .compatible = "ingenic,jz4740-tcu" },
+ { .compatible = "ingenic,jz4725b-tcu" },
+ { .compatible = "ingenic,jz4770-tcu" },
+ { /* sentinel */ }
+};
+
+static struct regmap * __init ingenic_tcu_create_regmap(struct device_node *np)
+{
+ struct resource res;
+ void __iomem *base;
+ struct regmap *map;
+
+ if (!of_match_node(ingenic_tcu_of_match, np))
+ return ERR_PTR(-EINVAL);
+
+ base = of_io_request_and_map(np, 0, "TCU");
+ if (IS_ERR(base))
+ return ERR_CAST(base);
+
+ map = regmap_init_mmio(NULL, base, &ingenic_tcu_regmap_config);
+ if (IS_ERR(map))
+ goto err_iounmap;
+
+ return map;
+
+err_iounmap:
+ iounmap(base);
+ of_address_to_resource(np, 0, &res);
+ release_mem_region(res.start, resource_size(&res));
+
+ return map;
+}
+
+static int __init ingenic_tcu_probe(struct platform_device *pdev)
+{
+ struct regmap *map = ingenic_tcu_get_regmap(pdev->dev.of_node);
+
+ platform_set_drvdata(pdev, map);
+
+ regmap_attach_dev(&pdev->dev, map, &ingenic_tcu_regmap_config);
+
+ return devm_of_platform_populate(&pdev->dev);
+}
+
+static struct platform_driver ingenic_tcu_driver = {
+ .driver = {
+ .name = "ingenic-tcu",
+ .of_match_table = ingenic_tcu_of_match,
+ },
+};
+
+static int __init ingenic_tcu_platform_init(void)
+{
+ return platform_driver_probe(&ingenic_tcu_driver,
+ ingenic_tcu_probe);
+}
+subsys_initcall(ingenic_tcu_platform_init);
+
+struct regmap * __init ingenic_tcu_get_regmap(struct device_node *np)
+{
+ if (!tcu_regmap)
+ tcu_regmap = ingenic_tcu_create_regmap(np);
+
+ return tcu_regmap;
+}
diff --git a/include/linux/mfd/ingenic-tcu.h b/include/linux/mfd/ingenic-tcu.h
index 2083fa20821d..045fb90c57fd 100644
--- a/include/linux/mfd/ingenic-tcu.h
+++ b/include/linux/mfd/ingenic-tcu.h
@@ -6,6 +6,10 @@
#define __LINUX_MFD_INGENIC_TCU_H_
#include <linux/bitops.h>
+#include <linux/init.h>
+
+struct device_node;
+struct regmap;
#define TCU_REG_WDT_TDR 0x00
#define TCU_REG_WDT_TCER 0x04
@@ -53,4 +57,6 @@
#define TCU_REG_TCNTc(c) (TCU_REG_TCNT0 + ((c) * TCU_CHANNEL_STRIDE))
#define TCU_REG_TCSRc(c) (TCU_REG_TCSR0 + ((c) * TCU_CHANNEL_STRIDE))
+struct regmap * __init ingenic_tcu_get_regmap(struct device_node *np);
+
#endif /* __LINUX_MFD_INGENIC_TCU_H_ */
--
2.21.0.593.g511ec345e18
^ permalink raw reply related
* [PATCH v14 05/13] clk: ingenic: Add driver for the TCU clocks
From: Paul Cercueil @ 2019-07-01 15:14 UTC (permalink / raw)
To: Lee Jones, Jonathan Corbet, Ralf Baechle, Paul Burton,
James Hogan, Michael Turquette, Stephen Boyd, Thomas Gleixner,
Daniel Lezcano
Cc: Mathieu Malaterre, od, devicetree, linux-kernel, linux-doc,
linux-mips, linux-clk, Paul Cercueil, Artur Rojek
In-Reply-To: <20190701151410.23127-1-paul@crapouillou.net>
Add driver to support the clocks provided by the Timer/Counter Unit
(TCU) of the JZ47xx SoCs from Ingenic.
Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Tested-by: Mathieu Malaterre <malat@debian.org>
Tested-by: Artur Rojek <contact@artur-rojek.eu>
---
Notes:
v12: New patch
v13:
- Don't enable/disable the TCU clock on demand. Enable it in the probe
and call it a day.
- Register suspend callbacks to gate/ungate the TCU clock on
suspend/resume.
- Use pr_fmt and pr_crit instead of custom TCU_ERR() macro
- Remove useless dependency on COMMON_CLK in Kconfig
- Remove registration of clkdev
v14: Change %i to %d
drivers/clk/ingenic/Kconfig | 10 +-
drivers/clk/ingenic/Makefile | 1 +
drivers/clk/ingenic/tcu.c | 473 +++++++++++++++++++++++++++++++++++
3 files changed, 483 insertions(+), 1 deletion(-)
create mode 100644 drivers/clk/ingenic/tcu.c
diff --git a/drivers/clk/ingenic/Kconfig b/drivers/clk/ingenic/Kconfig
index fe8db93cf21a..0f39c038670f 100644
--- a/drivers/clk/ingenic/Kconfig
+++ b/drivers/clk/ingenic/Kconfig
@@ -1,5 +1,5 @@
# SPDX-License-Identifier: GPL-2.0-only
-menu "Ingenic JZ47xx CGU drivers"
+menu "Ingenic JZ47xx drivers"
depends on MIPS
config INGENIC_CGU_COMMON
@@ -45,4 +45,12 @@ config INGENIC_CGU_JZ4780
If building for a JZ4780 SoC, you want to say Y here.
+config INGENIC_TCU_CLK
+ bool "Ingenic JZ47xx TCU clocks driver"
+ default MACH_INGENIC
+ select INGENIC_TCU
+ help
+ Support the clocks of the Timer/Counter Unit (TCU) of the Ingenic
+ JZ47xx SoCs.
+
endmenu
diff --git a/drivers/clk/ingenic/Makefile b/drivers/clk/ingenic/Makefile
index ab58a6a862a5..d25a5801bd8a 100644
--- a/drivers/clk/ingenic/Makefile
+++ b/drivers/clk/ingenic/Makefile
@@ -4,3 +4,4 @@ obj-$(CONFIG_INGENIC_CGU_JZ4740) += jz4740-cgu.o
obj-$(CONFIG_INGENIC_CGU_JZ4725B) += jz4725b-cgu.o
obj-$(CONFIG_INGENIC_CGU_JZ4770) += jz4770-cgu.o
obj-$(CONFIG_INGENIC_CGU_JZ4780) += jz4780-cgu.o
+obj-$(CONFIG_INGENIC_TCU_CLK) += tcu.o
diff --git a/drivers/clk/ingenic/tcu.c b/drivers/clk/ingenic/tcu.c
new file mode 100644
index 000000000000..528aa215eb0f
--- /dev/null
+++ b/drivers/clk/ingenic/tcu.c
@@ -0,0 +1,473 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * JZ47xx SoCs TCU clocks driver
+ * Copyright (C) 2019 Paul Cercueil <paul@crapouillou.net>
+ */
+
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
+#include <linux/clockchips.h>
+#include <linux/mfd/ingenic-tcu.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+#include <linux/syscore_ops.h>
+
+#include <dt-bindings/clock/ingenic,tcu.h>
+
+/* 8 channels max + watchdog + OST */
+#define TCU_CLK_COUNT 10
+
+#undef pr_fmt
+#define pr_fmt(fmt) "ingenic-tcu-clk: " fmt
+
+enum tcu_clk_parent {
+ TCU_PARENT_PCLK,
+ TCU_PARENT_RTC,
+ TCU_PARENT_EXT,
+};
+
+struct ingenic_soc_info {
+ unsigned int num_channels;
+ bool has_ost;
+ bool has_tcu_clk;
+};
+
+struct ingenic_tcu_clk_info {
+ struct clk_init_data init_data;
+ u8 gate_bit;
+ u8 tcsr_reg;
+};
+
+struct ingenic_tcu_clk {
+ struct clk_hw hw;
+ unsigned int idx;
+ struct ingenic_tcu *tcu;
+ const struct ingenic_tcu_clk_info *info;
+};
+
+struct ingenic_tcu {
+ const struct ingenic_soc_info *soc_info;
+ struct regmap *map;
+ struct clk *clk;
+
+ struct clk_hw_onecell_data *clocks;
+};
+
+static struct ingenic_tcu *ingenic_tcu;
+
+static inline struct ingenic_tcu_clk *to_tcu_clk(struct clk_hw *hw)
+{
+ return container_of(hw, struct ingenic_tcu_clk, hw);
+}
+
+static int ingenic_tcu_enable(struct clk_hw *hw)
+{
+ struct ingenic_tcu_clk *tcu_clk = to_tcu_clk(hw);
+ const struct ingenic_tcu_clk_info *info = tcu_clk->info;
+ struct ingenic_tcu *tcu = tcu_clk->tcu;
+
+ regmap_write(tcu->map, TCU_REG_TSCR, BIT(info->gate_bit));
+
+ return 0;
+}
+
+static void ingenic_tcu_disable(struct clk_hw *hw)
+{
+ struct ingenic_tcu_clk *tcu_clk = to_tcu_clk(hw);
+ const struct ingenic_tcu_clk_info *info = tcu_clk->info;
+ struct ingenic_tcu *tcu = tcu_clk->tcu;
+
+ regmap_write(tcu->map, TCU_REG_TSSR, BIT(info->gate_bit));
+}
+
+static int ingenic_tcu_is_enabled(struct clk_hw *hw)
+{
+ struct ingenic_tcu_clk *tcu_clk = to_tcu_clk(hw);
+ const struct ingenic_tcu_clk_info *info = tcu_clk->info;
+ unsigned int value;
+
+ regmap_read(tcu_clk->tcu->map, TCU_REG_TSR, &value);
+
+ return !(value & BIT(info->gate_bit));
+}
+
+static bool ingenic_tcu_enable_regs(struct clk_hw *hw)
+{
+ struct ingenic_tcu_clk *tcu_clk = to_tcu_clk(hw);
+ const struct ingenic_tcu_clk_info *info = tcu_clk->info;
+ struct ingenic_tcu *tcu = tcu_clk->tcu;
+ bool enabled = false;
+
+ /*
+ * If the SoC has no global TCU clock, we must ungate the channel's
+ * clock to be able to access its registers.
+ * If we have a TCU clock, it will be enabled automatically as it has
+ * been attached to the regmap.
+ */
+ if (!tcu->clk) {
+ enabled = !!ingenic_tcu_is_enabled(hw);
+ regmap_write(tcu->map, TCU_REG_TSCR, BIT(info->gate_bit));
+ }
+
+ return enabled;
+}
+
+static void ingenic_tcu_disable_regs(struct clk_hw *hw)
+{
+ struct ingenic_tcu_clk *tcu_clk = to_tcu_clk(hw);
+ const struct ingenic_tcu_clk_info *info = tcu_clk->info;
+ struct ingenic_tcu *tcu = tcu_clk->tcu;
+
+ if (!tcu->clk)
+ regmap_write(tcu->map, TCU_REG_TSSR, BIT(info->gate_bit));
+}
+
+static u8 ingenic_tcu_get_parent(struct clk_hw *hw)
+{
+ struct ingenic_tcu_clk *tcu_clk = to_tcu_clk(hw);
+ const struct ingenic_tcu_clk_info *info = tcu_clk->info;
+ unsigned int val = 0;
+ int ret;
+
+ ret = regmap_read(tcu_clk->tcu->map, info->tcsr_reg, &val);
+ WARN_ONCE(ret < 0, "Unable to read TCSR %d", tcu_clk->idx);
+
+ return ffs(val & TCU_TCSR_PARENT_CLOCK_MASK) - 1;
+}
+
+static int ingenic_tcu_set_parent(struct clk_hw *hw, u8 idx)
+{
+ struct ingenic_tcu_clk *tcu_clk = to_tcu_clk(hw);
+ const struct ingenic_tcu_clk_info *info = tcu_clk->info;
+ bool was_enabled;
+ int ret;
+
+ was_enabled = ingenic_tcu_enable_regs(hw);
+
+ ret = regmap_update_bits(tcu_clk->tcu->map, info->tcsr_reg,
+ TCU_TCSR_PARENT_CLOCK_MASK, BIT(idx));
+ WARN_ONCE(ret < 0, "Unable to update TCSR %d", tcu_clk->idx);
+
+ if (!was_enabled)
+ ingenic_tcu_disable_regs(hw);
+
+ return 0;
+}
+
+static unsigned long ingenic_tcu_recalc_rate(struct clk_hw *hw,
+ unsigned long parent_rate)
+{
+ struct ingenic_tcu_clk *tcu_clk = to_tcu_clk(hw);
+ const struct ingenic_tcu_clk_info *info = tcu_clk->info;
+ unsigned int prescale;
+ int ret;
+
+ ret = regmap_read(tcu_clk->tcu->map, info->tcsr_reg, &prescale);
+ WARN_ONCE(ret < 0, "Unable to read TCSR %d", tcu_clk->idx);
+
+ prescale = (prescale & TCU_TCSR_PRESCALE_MASK) >> TCU_TCSR_PRESCALE_LSB;
+
+ return parent_rate >> (prescale * 2);
+}
+
+static u8 ingenic_tcu_get_prescale(unsigned long rate, unsigned long req_rate)
+{
+ u8 prescale;
+
+ for (prescale = 0; prescale < 5; prescale++)
+ if ((rate >> (prescale * 2)) <= req_rate)
+ return prescale;
+
+ return 5; /* /1024 divider */
+}
+
+static long ingenic_tcu_round_rate(struct clk_hw *hw, unsigned long req_rate,
+ unsigned long *parent_rate)
+{
+ unsigned long rate = *parent_rate;
+ u8 prescale;
+
+ if (req_rate > rate)
+ return -EINVAL;
+
+ prescale = ingenic_tcu_get_prescale(rate, req_rate);
+
+ return rate >> (prescale * 2);
+}
+
+static int ingenic_tcu_set_rate(struct clk_hw *hw, unsigned long req_rate,
+ unsigned long parent_rate)
+{
+ struct ingenic_tcu_clk *tcu_clk = to_tcu_clk(hw);
+ const struct ingenic_tcu_clk_info *info = tcu_clk->info;
+ u8 prescale = ingenic_tcu_get_prescale(parent_rate, req_rate);
+ bool was_enabled;
+ int ret;
+
+ was_enabled = ingenic_tcu_enable_regs(hw);
+
+ ret = regmap_update_bits(tcu_clk->tcu->map, info->tcsr_reg,
+ TCU_TCSR_PRESCALE_MASK,
+ prescale << TCU_TCSR_PRESCALE_LSB);
+ WARN_ONCE(ret < 0, "Unable to update TCSR %d", tcu_clk->idx);
+
+ if (!was_enabled)
+ ingenic_tcu_disable_regs(hw);
+
+ return 0;
+}
+
+static const struct clk_ops ingenic_tcu_clk_ops = {
+ .get_parent = ingenic_tcu_get_parent,
+ .set_parent = ingenic_tcu_set_parent,
+
+ .recalc_rate = ingenic_tcu_recalc_rate,
+ .round_rate = ingenic_tcu_round_rate,
+ .set_rate = ingenic_tcu_set_rate,
+
+ .enable = ingenic_tcu_enable,
+ .disable = ingenic_tcu_disable,
+ .is_enabled = ingenic_tcu_is_enabled,
+};
+
+static const char * const ingenic_tcu_timer_parents[] = {
+ [TCU_PARENT_PCLK] = "pclk",
+ [TCU_PARENT_RTC] = "rtc",
+ [TCU_PARENT_EXT] = "ext",
+};
+
+#define DEF_TIMER(_name, _gate_bit, _tcsr) \
+ { \
+ .init_data = { \
+ .name = _name, \
+ .parent_names = ingenic_tcu_timer_parents, \
+ .num_parents = ARRAY_SIZE(ingenic_tcu_timer_parents),\
+ .ops = &ingenic_tcu_clk_ops, \
+ .flags = CLK_SET_RATE_UNGATE, \
+ }, \
+ .gate_bit = _gate_bit, \
+ .tcsr_reg = _tcsr, \
+ }
+static const struct ingenic_tcu_clk_info ingenic_tcu_clk_info[] = {
+ [TCU_CLK_TIMER0] = DEF_TIMER("timer0", 0, TCU_REG_TCSRc(0)),
+ [TCU_CLK_TIMER1] = DEF_TIMER("timer1", 1, TCU_REG_TCSRc(1)),
+ [TCU_CLK_TIMER2] = DEF_TIMER("timer2", 2, TCU_REG_TCSRc(2)),
+ [TCU_CLK_TIMER3] = DEF_TIMER("timer3", 3, TCU_REG_TCSRc(3)),
+ [TCU_CLK_TIMER4] = DEF_TIMER("timer4", 4, TCU_REG_TCSRc(4)),
+ [TCU_CLK_TIMER5] = DEF_TIMER("timer5", 5, TCU_REG_TCSRc(5)),
+ [TCU_CLK_TIMER6] = DEF_TIMER("timer6", 6, TCU_REG_TCSRc(6)),
+ [TCU_CLK_TIMER7] = DEF_TIMER("timer7", 7, TCU_REG_TCSRc(7)),
+};
+
+static const struct ingenic_tcu_clk_info ingenic_tcu_watchdog_clk_info =
+ DEF_TIMER("wdt", 16, TCU_REG_WDT_TCSR);
+static const struct ingenic_tcu_clk_info ingenic_tcu_ost_clk_info =
+ DEF_TIMER("ost", 15, TCU_REG_OST_TCSR);
+#undef DEF_TIMER
+
+static int __init ingenic_tcu_register_clock(struct ingenic_tcu *tcu,
+ unsigned int idx, enum tcu_clk_parent parent,
+ const struct ingenic_tcu_clk_info *info,
+ struct clk_hw_onecell_data *clocks)
+{
+ struct ingenic_tcu_clk *tcu_clk;
+ int err;
+
+ tcu_clk = kzalloc(sizeof(*tcu_clk), GFP_KERNEL);
+ if (!tcu_clk)
+ return -ENOMEM;
+
+ tcu_clk->hw.init = &info->init_data;
+ tcu_clk->idx = idx;
+ tcu_clk->info = info;
+ tcu_clk->tcu = tcu;
+
+ /* Reset channel and clock divider, set default parent */
+ ingenic_tcu_enable_regs(&tcu_clk->hw);
+ regmap_update_bits(tcu->map, info->tcsr_reg, 0xffff, BIT(parent));
+ ingenic_tcu_disable_regs(&tcu_clk->hw);
+
+ err = clk_hw_register(NULL, &tcu_clk->hw);
+ if (err) {
+ kfree(tcu_clk);
+ return err;
+ }
+
+ clocks->hws[idx] = &tcu_clk->hw;
+
+ return 0;
+}
+
+static const struct ingenic_soc_info jz4740_soc_info = {
+ .num_channels = 8,
+ .has_ost = false,
+ .has_tcu_clk = true,
+};
+
+static const struct ingenic_soc_info jz4725b_soc_info = {
+ .num_channels = 6,
+ .has_ost = true,
+ .has_tcu_clk = true,
+};
+
+static const struct ingenic_soc_info jz4770_soc_info = {
+ .num_channels = 8,
+ .has_ost = true,
+ .has_tcu_clk = false,
+};
+
+static const struct of_device_id ingenic_tcu_of_match[] __initconst = {
+ { .compatible = "ingenic,jz4740-tcu", .data = &jz4740_soc_info, },
+ { .compatible = "ingenic,jz4725b-tcu", .data = &jz4725b_soc_info, },
+ { .compatible = "ingenic,jz4770-tcu", .data = &jz4770_soc_info, },
+ { }
+};
+
+static int __init ingenic_tcu_probe(struct device_node *np)
+{
+ const struct of_device_id *id = of_match_node(ingenic_tcu_of_match, np);
+ struct ingenic_tcu *tcu;
+ struct regmap *map;
+ unsigned int i;
+ int ret;
+
+ map = ingenic_tcu_get_regmap(np);
+ if (IS_ERR(map))
+ return PTR_ERR(map);
+
+ tcu = kzalloc(sizeof(*tcu), GFP_KERNEL);
+ if (!tcu)
+ return -ENOMEM;
+
+ tcu->map = map;
+ tcu->soc_info = id->data;
+
+ if (tcu->soc_info->has_tcu_clk) {
+ tcu->clk = of_clk_get_by_name(np, "tcu");
+ if (IS_ERR(tcu->clk)) {
+ ret = PTR_ERR(tcu->clk);
+ pr_crit("Cannot get TCU clock\n");
+ goto err_free_tcu;
+ }
+
+ ret = clk_prepare_enable(tcu->clk);
+ if (ret) {
+ pr_crit("Unable to enable TCU clock\n");
+ goto err_put_clk;
+ }
+ }
+
+ tcu->clocks = kzalloc(sizeof(*tcu->clocks) +
+ sizeof(*tcu->clocks->hws) * TCU_CLK_COUNT,
+ GFP_KERNEL);
+ if (!tcu->clocks) {
+ ret = -ENOMEM;
+ goto err_clk_disable;
+ }
+
+ tcu->clocks->num = TCU_CLK_COUNT;
+
+ for (i = 0; i < tcu->soc_info->num_channels; i++) {
+ ret = ingenic_tcu_register_clock(tcu, i, TCU_PARENT_EXT,
+ &ingenic_tcu_clk_info[i],
+ tcu->clocks);
+ if (ret) {
+ pr_crit("cannot register clock %d\n", i);
+ goto err_unregister_timer_clocks;
+ }
+ }
+
+ /*
+ * We set EXT as the default parent clock for all the TCU clocks
+ * except for the watchdog one, where we set the RTC clock as the
+ * parent. Since the EXT and PCLK are much faster than the RTC clock,
+ * the watchdog would kick after a maximum time of 5s, and we might
+ * want a slower kicking time.
+ */
+ ret = ingenic_tcu_register_clock(tcu, TCU_CLK_WDT, TCU_PARENT_RTC,
+ &ingenic_tcu_watchdog_clk_info,
+ tcu->clocks);
+ if (ret) {
+ pr_crit("cannot register watchdog clock\n");
+ goto err_unregister_timer_clocks;
+ }
+
+ if (tcu->soc_info->has_ost) {
+ ret = ingenic_tcu_register_clock(tcu, TCU_CLK_OST,
+ TCU_PARENT_EXT,
+ &ingenic_tcu_ost_clk_info,
+ tcu->clocks);
+ if (ret) {
+ pr_crit("cannot register ost clock\n");
+ goto err_unregister_watchdog_clock;
+ }
+ }
+
+ ret = of_clk_add_hw_provider(np, of_clk_hw_onecell_get, tcu->clocks);
+ if (ret) {
+ pr_crit("cannot add OF clock provider\n");
+ goto err_unregister_ost_clock;
+ }
+
+ ingenic_tcu = tcu;
+
+ return 0;
+
+err_unregister_ost_clock:
+ if (tcu->soc_info->has_ost)
+ clk_hw_unregister(tcu->clocks->hws[i + 1]);
+err_unregister_watchdog_clock:
+ clk_hw_unregister(tcu->clocks->hws[i]);
+err_unregister_timer_clocks:
+ for (i = 0; i < tcu->clocks->num; i++)
+ if (tcu->clocks->hws[i])
+ clk_hw_unregister(tcu->clocks->hws[i]);
+ kfree(tcu->clocks);
+err_clk_disable:
+ if (tcu->soc_info->has_tcu_clk)
+ clk_disable_unprepare(tcu->clk);
+err_put_clk:
+ if (tcu->soc_info->has_tcu_clk)
+ clk_put(tcu->clk);
+err_free_tcu:
+ kfree(tcu);
+ return ret;
+}
+
+static int __maybe_unused tcu_pm_suspend(void)
+{
+ struct ingenic_tcu *tcu = ingenic_tcu;
+
+ if (tcu->clk)
+ clk_disable(tcu->clk);
+
+ return 0;
+}
+
+static void __maybe_unused tcu_pm_resume(void)
+{
+ struct ingenic_tcu *tcu = ingenic_tcu;
+
+ if (tcu->clk)
+ clk_enable(tcu->clk);
+}
+
+static struct syscore_ops __maybe_unused tcu_pm_ops = {
+ .suspend = tcu_pm_suspend,
+ .resume = tcu_pm_resume,
+};
+
+static void __init ingenic_tcu_init(struct device_node *np)
+{
+ int ret = ingenic_tcu_probe(np);
+
+ if (ret)
+ pr_crit("Failed to initialize TCU clocks: %d\n", ret);
+
+ if (IS_ENABLED(CONFIG_PM_SLEEP))
+ register_syscore_ops(&tcu_pm_ops);
+}
+
+CLK_OF_DECLARE(jz4740_cgu, "ingenic,jz4740-tcu", ingenic_tcu_init);
+CLK_OF_DECLARE(jz4725b_cgu, "ingenic,jz4725b-tcu", ingenic_tcu_init);
+CLK_OF_DECLARE(jz4770_cgu, "ingenic,jz4770-tcu", ingenic_tcu_init);
--
2.21.0.593.g511ec345e18
^ permalink raw reply related
* [PATCH v14 03/13] dt-bindings: Add doc for the Ingenic TCU drivers
From: Paul Cercueil @ 2019-07-01 15:14 UTC (permalink / raw)
To: Lee Jones, Jonathan Corbet, Ralf Baechle, Paul Burton,
James Hogan, Michael Turquette, Stephen Boyd, Thomas Gleixner,
Daniel Lezcano
Cc: Mathieu Malaterre, od, devicetree, linux-kernel, linux-doc,
linux-mips, linux-clk, Paul Cercueil, Rob Herring, Artur Rojek
In-Reply-To: <20190701151410.23127-1-paul@crapouillou.net>
Add documentation about how to properly use the Ingenic TCU
(Timer/Counter Unit) drivers from devicetree.
Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Reviewed-by: Rob Herring <robh@kernel.org>
Tested-by: Mathieu Malaterre <malat@debian.org>
Tested-by: Artur Rojek <contact@artur-rojek.eu>
---
Notes:
v4: New patch in this series. Corresponds to V2 patches 3-4-5 with
added content.
v5:
- Edited PWM/watchdog DT bindings documentation to point to the new
document.
- Moved main document to
Documentation/devicetree/bindings/timer/ingenic,tcu.txt
- Updated documentation to reflect the new devicetree bindings.
v6:
- Removed PWM/watchdog documentation files as asked by upstream
- Removed doc about properties that should be implicit
- Removed doc about ingenic,timer-channel /
ingenic,clocksource-channel as they are gone
- Fix WDT clock name in the binding doc
- Fix lengths of register areas in watchdog/pwm nodes
v7: No change
v8:
- Fix address of the PWM node
- Added doc about system timer and clocksource children nodes
v9:
- Remove doc about system timer and clocksource children
nodes...
- Add doc about ingenic,pwm-channels-mask property
v10: No change
v11: Fix info about default value of ingenic,pwm-channels-mask
v12: Drop sub-nodes for now; they will be introduced in a follow-up
patchset.
v13:
- Revert back to v11. Turns out it was okay.
- Remove 'interrupt-parent' of the list of required properties.
v14: No change
.../bindings/pwm/ingenic,jz47xx-pwm.txt | 25 ----
.../devicetree/bindings/timer/ingenic,tcu.txt | 136 ++++++++++++++++++
.../bindings/watchdog/ingenic,jz4740-wdt.txt | 17 ---
3 files changed, 136 insertions(+), 42 deletions(-)
delete mode 100644 Documentation/devicetree/bindings/pwm/ingenic,jz47xx-pwm.txt
create mode 100644 Documentation/devicetree/bindings/timer/ingenic,tcu.txt
delete mode 100644 Documentation/devicetree/bindings/watchdog/ingenic,jz4740-wdt.txt
diff --git a/Documentation/devicetree/bindings/pwm/ingenic,jz47xx-pwm.txt b/Documentation/devicetree/bindings/pwm/ingenic,jz47xx-pwm.txt
deleted file mode 100644
index 7d9d3f90641b..000000000000
--- a/Documentation/devicetree/bindings/pwm/ingenic,jz47xx-pwm.txt
+++ /dev/null
@@ -1,25 +0,0 @@
-Ingenic JZ47xx PWM Controller
-=============================
-
-Required properties:
-- compatible: One of:
- * "ingenic,jz4740-pwm"
- * "ingenic,jz4770-pwm"
- * "ingenic,jz4780-pwm"
-- #pwm-cells: Should be 3. See pwm.txt in this directory for a description
- of the cells format.
-- clocks : phandle to the external clock.
-- clock-names : Should be "ext".
-
-
-Example:
-
- pwm: pwm@10002000 {
- compatible = "ingenic,jz4740-pwm";
- reg = <0x10002000 0x1000>;
-
- #pwm-cells = <3>;
-
- clocks = <&ext>;
- clock-names = "ext";
- };
diff --git a/Documentation/devicetree/bindings/timer/ingenic,tcu.txt b/Documentation/devicetree/bindings/timer/ingenic,tcu.txt
new file mode 100644
index 000000000000..87962da64561
--- /dev/null
+++ b/Documentation/devicetree/bindings/timer/ingenic,tcu.txt
@@ -0,0 +1,136 @@
+Ingenic JZ47xx SoCs Timer/Counter Unit devicetree bindings
+==========================================================
+
+For a description of the TCU hardware and drivers, have a look at
+Documentation/mips/ingenic-tcu.txt.
+
+Required properties:
+
+- compatible: Must be one of:
+ * ingenic,jz4740-tcu
+ * ingenic,jz4725b-tcu
+ * ingenic,jz4770-tcu
+- reg: Should be the offset/length value corresponding to the TCU registers
+- clocks: List of phandle & clock specifiers for clocks external to the TCU.
+ The "pclk", "rtc" and "ext" clocks should be provided. The "tcu" clock
+ should be provided if the SoC has it.
+- clock-names: List of name strings for the external clocks.
+- #clock-cells: Should be <1>;
+ Clock consumers specify this argument to identify a clock. The valid values
+ may be found in <dt-bindings/clock/ingenic,tcu.h>.
+- interrupt-controller : Identifies the node as an interrupt controller
+- #interrupt-cells : Specifies the number of cells needed to encode an
+ interrupt source. The value should be 1.
+- interrupts : Specifies the interrupt the controller is connected to.
+
+Optional properties:
+
+- ingenic,pwm-channels-mask: Bitmask of TCU channels reserved for PWM use.
+ Default value is 0xfc.
+
+
+Children nodes
+==========================================================
+
+
+PWM node:
+---------
+
+Required properties:
+
+- compatible: Must be one of:
+ * ingenic,jz4740-pwm
+ * ingenic,jz4725b-pwm
+- #pwm-cells: Should be 3. See ../pwm/pwm.txt for a description of the cell
+ format.
+- clocks: List of phandle & clock specifiers for the TCU clocks.
+- clock-names: List of name strings for the TCU clocks.
+
+
+Watchdog node:
+--------------
+
+Required properties:
+
+- compatible: Must be "ingenic,jz4740-watchdog"
+- clocks: phandle to the WDT clock
+- clock-names: should be "wdt"
+
+
+OS Timer node:
+---------
+
+Required properties:
+
+- compatible: Must be one of:
+ * ingenic,jz4725b-ost
+ * ingenic,jz4770-ost
+- clocks: phandle to the OST clock
+- clock-names: should be "ost"
+- interrupts : Specifies the interrupt the OST is connected to.
+
+
+Example
+==========================================================
+
+#include <dt-bindings/clock/jz4770-cgu.h>
+#include <dt-bindings/clock/ingenic,tcu.h>
+
+/ {
+ tcu: timer@10002000 {
+ compatible = "ingenic,jz4770-tcu";
+ reg = <0x10002000 0x1000>;
+ #address-cells = <1>;
+ #size-cells = <1>;
+ ranges = <0x0 0x10002000 0x1000>;
+
+ #clock-cells = <1>;
+
+ clocks = <&cgu JZ4770_CLK_RTC
+ &cgu JZ4770_CLK_EXT
+ &cgu JZ4770_CLK_PCLK>;
+ clock-names = "rtc", "ext", "pclk";
+
+ interrupt-controller;
+ #interrupt-cells = <1>;
+
+ interrupt-parent = <&intc>;
+ interrupts = <27 26 25>;
+
+ watchdog: watchdog@0 {
+ compatible = "ingenic,jz4740-watchdog";
+ reg = <0x0 0xc>;
+
+ clocks = <&tcu TCU_CLK_WDT>;
+ clock-names = "wdt";
+ };
+
+ pwm: pwm@40 {
+ compatible = "ingenic,jz4740-pwm";
+ reg = <0x40 0x80>;
+
+ #pwm-cells = <3>;
+
+ clocks = <&tcu TCU_CLK_TIMER0
+ &tcu TCU_CLK_TIMER1
+ &tcu TCU_CLK_TIMER2
+ &tcu TCU_CLK_TIMER3
+ &tcu TCU_CLK_TIMER4
+ &tcu TCU_CLK_TIMER5
+ &tcu TCU_CLK_TIMER6
+ &tcu TCU_CLK_TIMER7>;
+ clock-names = "timer0", "timer1", "timer2", "timer3",
+ "timer4", "timer5", "timer6", "timer7";
+ };
+
+ ost: timer@e0 {
+ compatible = "ingenic,jz4770-ost";
+ reg = <0xe0 0x20>;
+
+ clocks = <&tcu TCU_CLK_OST>;
+ clock-names = "ost";
+
+ interrupts = <15>;
+ };
+ };
+};
diff --git a/Documentation/devicetree/bindings/watchdog/ingenic,jz4740-wdt.txt b/Documentation/devicetree/bindings/watchdog/ingenic,jz4740-wdt.txt
deleted file mode 100644
index ce1cb72d5345..000000000000
--- a/Documentation/devicetree/bindings/watchdog/ingenic,jz4740-wdt.txt
+++ /dev/null
@@ -1,17 +0,0 @@
-Ingenic Watchdog Timer (WDT) Controller for JZ4740 & JZ4780
-
-Required properties:
-compatible: "ingenic,jz4740-watchdog" or "ingenic,jz4780-watchdog"
-reg: Register address and length for watchdog registers
-clocks: phandle to the RTC clock
-clock-names: should be "rtc"
-
-Example:
-
-watchdog: jz4740-watchdog@10002000 {
- compatible = "ingenic,jz4740-watchdog";
- reg = <0x10002000 0x10>;
-
- clocks = <&cgu JZ4740_CLK_RTC>;
- clock-names = "rtc";
-};
--
2.21.0.593.g511ec345e18
^ permalink raw reply related
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