| Message ID | 20181210132227.29262-2-narmstrong@baylibre.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | arm64: meson-gxm: Add support for the Mali T820 GPU | expand |
On Mon, Dec 10, 2018 at 7:22 AM Neil Armstrong <narmstrong@baylibre.com> wrote: > > The Amlogic ARM Mali Midgard requires reset controls to power on and > software reset the GPU, adds these as optional in the bindings. > > Signed-off-by: Neil Armstrong <narmstrong@baylibre.com> > --- > Documentation/devicetree/bindings/gpu/arm,mali-midgard.txt | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/Documentation/devicetree/bindings/gpu/arm,mali-midgard.txt b/Documentation/devicetree/bindings/gpu/arm,mali-midgard.txt > index 18a2cde2e5f3..24d83ec952f1 100644 > --- a/Documentation/devicetree/bindings/gpu/arm,mali-midgard.txt > +++ b/Documentation/devicetree/bindings/gpu/arm,mali-midgard.txt > @@ -37,6 +37,8 @@ Optional properties: > - operating-points-v2 : Refer to Documentation/devicetree/bindings/opp/opp.txt > for details. > > +- resets : Phandle to the reset controls for the Mali Midgard device. How many? Sounds like 1, but the dts has 2. There's also a similar patch for Allwinner[1]. I don't want to see a different number of resets and different names for each vendor. So first figure out how many resets the IP block has. You'll have to find someone with access to the TRM. Rob [1] https://patchwork.ozlabs.org/patch/1003654/
On 11/12/2018 17:58, Rob Herring wrote: > On Mon, Dec 10, 2018 at 7:22 AM Neil Armstrong <narmstrong@baylibre.com> wrote: >> >> The Amlogic ARM Mali Midgard requires reset controls to power on and >> software reset the GPU, adds these as optional in the bindings. >> >> Signed-off-by: Neil Armstrong <narmstrong@baylibre.com> >> --- >> Documentation/devicetree/bindings/gpu/arm,mali-midgard.txt | 2 ++ >> 1 file changed, 2 insertions(+) >> >> diff --git a/Documentation/devicetree/bindings/gpu/arm,mali-midgard.txt b/Documentation/devicetree/bindings/gpu/arm,mali-midgard.txt >> index 18a2cde2e5f3..24d83ec952f1 100644 >> --- a/Documentation/devicetree/bindings/gpu/arm,mali-midgard.txt >> +++ b/Documentation/devicetree/bindings/gpu/arm,mali-midgard.txt >> @@ -37,6 +37,8 @@ Optional properties: >> - operating-points-v2 : Refer to Documentation/devicetree/bindings/opp/opp.txt >> for details. >> >> +- resets : Phandle to the reset controls for the Mali Midgard device. > > How many? Sounds like 1, but the dts has 2. There's also a similar > patch for Allwinner[1]. I don't want to see a different number of > resets and different names for each vendor. So first figure out how > many resets the IP block has. You'll have to find someone with access > to the TRM. I can answer for Amlogic, they have a reset for the bus interface and the GPU IP itself. You are asking something impossible ;-) We can assume it has a single reset interface, but vendors can add more to reset some glue HW. So we will need some variant per-vendor, sorry to annoy you ! Neil > > Rob > > [1] https://patchwork.ozlabs.org/patch/1003654/ >
diff --git a/Documentation/devicetree/bindings/gpu/arm,mali-midgard.txt b/Documentation/devicetree/bindings/gpu/arm,mali-midgard.txt index 18a2cde2e5f3..24d83ec952f1 100644 --- a/Documentation/devicetree/bindings/gpu/arm,mali-midgard.txt +++ b/Documentation/devicetree/bindings/gpu/arm,mali-midgard.txt @@ -37,6 +37,8 @@ Optional properties: - operating-points-v2 : Refer to Documentation/devicetree/bindings/opp/opp.txt for details. +- resets : Phandle to the reset controls for the Mali Midgard device. + Example for a Mali-T760:
The Amlogic ARM Mali Midgard requires reset controls to power on and software reset the GPU, adds these as optional in the bindings. Signed-off-by: Neil Armstrong <narmstrong@baylibre.com> --- Documentation/devicetree/bindings/gpu/arm,mali-midgard.txt | 2 ++ 1 file changed, 2 insertions(+)