On Tue, Jul 17, 2018 at 04:55:10PM -0700, Doug Anderson wrote:
> Hi,
>
> On Tue, Jul 17, 2018 at 4:42 PM, Matthias Kaehlcke <mka@xxxxxxxxxxxx> wrote:
> > On Thu, Jul 12, 2018 at 02:09:04PM +0530, Amit Kucheria wrote:
> >> We also split up the regmap address space into two, for the TM and SROT
> >> registers. This was required to deal with different address offsets for the
> >> TM and SROT registers across different SoC families.
> >>
> >> 8996 has two TSENS IP blocks, initialise the second one too.
> >>
> >> Since tsens-common.c/init_common() currently only registers one address
> >> space, the order is important (TM before SROT). This is OK since the code
> >> doesn't really use the SROT functionality yet.
> >>
> >> Signed-off-by: Amit Kucheria <amit.kucheria@xxxxxxxxxx>
> >> Reviewed-by: Bjorn Andersson <bjorn.andersson@xxxxxxxxxx>
> >> Tested-by: Matthias Kaehlcke <mka@xxxxxxxxxxxx>
> >> ---
> >> arch/arm64/boot/dts/qcom/msm8996.dtsi | 14 ++++++++++++--
> >> 1 file changed, 12 insertions(+), 2 deletions(-)
> >>
> >> diff --git a/arch/arm64/boot/dts/qcom/msm8996.dtsi b/arch/arm64/boot/dts/qcom/msm8996.dtsi
> >> index 8c7f9ca..688e752 100644
> >> --- a/arch/arm64/boot/dts/qcom/msm8996.dtsi
> >> +++ b/arch/arm64/boot/dts/qcom/msm8996.dtsi
> >> @@ -459,9 +459,19 @@
> >> status = "disabled";
> >> };
> >>
> >> - tsens0: thermal-sensor@4a8000 {
> >> + tsens0: thermal-sensor@4a9000 {
> > ~~~~~~
> >
> > I suppose the address of the TM block is used here instead of the SROT
> > address (which is lower) since SROT functionality is currently not
> > used. Would/should this change if/when the driver uses SROT?
>
> For device tree you're always supposed to use the address of the first
> "reg" listed as the unit address in the node name. It doesn't matter
> if it's bigger or smaller as long as it's the first one listed.
>
> The bindings indicate that the TM block should be listed as the first
> register. This won't change even if you start using SROT.
Thanks for the clarification, there is always something more to learn!
Reviewed-by: Matthias Kaehlcke <mka@xxxxxxxxxxxx>
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