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SubjectRe: [PATCH v1 1/1] scripts: dtc: mask flags bit when check i2c addr
On Fri, Feb 28, 2020 at 7:20 PM Rob Herring <robh+dt@kernel.org> wrote:
>
> On Fri, Feb 28, 2020 at 2:48 AM Rayagonda Kokatanur
> <rayagonda.kokatanur@broadcom.com> wrote:
> >
> > Generally i2c addr should not be greater than 10-bit. The highest 2 bits
> > are used for I2C_TEN_BIT_ADDRESS and I2C_OWN_SLAVE_ADDRESS. Need to mask
> > these flags if check slave addr valid.
> >
> > Signed-off-by: Rayagonda Kokatanur <rayagonda.kokatanur@broadcom.com>
> > ---
> > scripts/dtc/Makefile | 2 +-
> > scripts/dtc/checks.c | 5 +++++
> > 2 files changed, 6 insertions(+), 1 deletion(-)
>
> dtc changes must be submitted against upstream dtc.

Please let me know link to clone the upstream dtc branch.
>
>
> > diff --git a/scripts/dtc/Makefile b/scripts/dtc/Makefile
> > index 3acbb410904c..c5e8d6a9e73c 100644
> > --- a/scripts/dtc/Makefile
> > +++ b/scripts/dtc/Makefile
> > @@ -9,7 +9,7 @@ dtc-objs := dtc.o flattree.o fstree.o data.o livetree.o treesource.o \
> > dtc-objs += dtc-lexer.lex.o dtc-parser.tab.o
> >
> > # Source files need to get at the userspace version of libfdt_env.h to compile
> > -HOST_EXTRACFLAGS := -I $(srctree)/$(src)/libfdt
> > +HOST_EXTRACFLAGS := -I $(srctree)/$(src)/libfdt -I$(srctree)/tools/include
> >
> > ifeq ($(shell pkg-config --exists yaml-0.1 2>/dev/null && echo yes),)
> > ifneq ($(CHECK_DTBS),)
> > diff --git a/scripts/dtc/checks.c b/scripts/dtc/checks.c
> > index 756f0fa9203f..17c9ed4137b5 100644
> > --- a/scripts/dtc/checks.c
> > +++ b/scripts/dtc/checks.c
> > @@ -3,6 +3,7 @@
> > * (C) Copyright David Gibson <dwg@au1.ibm.com>, IBM Corporation. 2007.
> > */
> >
> > +#include <linux/bits.h>
>
> Not a UAPI header not that that would be much better as dtc also builds on Mac.
>
> > #include "dtc.h"
> > #include "srcpos.h"
> >
> > @@ -17,6 +18,9 @@
> > #define TRACE(c, fmt, ...) do { } while (0)
> > #endif
> >
> > +#define I2C_TEN_BIT_ADDRESS BIT(31)
> > +#define I2C_OWN_SLAVE_ADDRESS BIT(30)
> > +
> > enum checkstatus {
> > UNCHECKED = 0,
> > PREREQ,
> > @@ -1048,6 +1052,7 @@ static void check_i2c_bus_reg(struct check *c, struct dt_info *dti, struct node
> >
> > for (len = prop->val.len; len > 0; len -= 4) {
> > reg = fdt32_to_cpu(*(cells++));
> > + reg &= ~(I2C_OWN_SLAVE_ADDRESS | I2C_TEN_BIT_ADDRESS);
>
> I'd just mask the top byte so we don't have to update on the next flag we add.
Do you mean something like this, shown below ?
reg &= 0xFFFF_FC000;

>
> Rob

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