| Message ID | 20200311074032.119481-2-jitao.shi@mediatek.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Config mipi tx drive current and impedance | expand |
On Wed, Mar 11, 2020 at 03:40:29PM +0800, Jitao Shi wrote: > Add a property to control mipi tx drive current: > "drive-strength-microamp" > > Signed-off-by: Jitao Shi <jitao.shi@mediatek.com> > --- > .../devicetree/bindings/display/mediatek/mediatek,dsi.txt | 4 ++++ > 1 file changed, 4 insertions(+) > > diff --git a/Documentation/devicetree/bindings/display/mediatek/mediatek,dsi.txt b/Documentation/devicetree/bindings/display/mediatek/mediatek,dsi.txt > index a19a6cc375ed..d501f9ff4b1f 100644 > --- a/Documentation/devicetree/bindings/display/mediatek/mediatek,dsi.txt > +++ b/Documentation/devicetree/bindings/display/mediatek/mediatek,dsi.txt > @@ -33,6 +33,9 @@ Required properties: > - #clock-cells: must be <0>; > - #phy-cells: must be <0>. > > +Optional properties: > +- drive-strength-microamp: adjust driving current, should be 1 ~ 0xF TBC, 1-0xf is in units of microamps? So a max drive strength of 15uA? Seems a bit low. > + > Example: > > mipi_tx0: mipi-dphy@10215000 { > @@ -42,6 +45,7 @@ mipi_tx0: mipi-dphy@10215000 { > clock-output-names = "mipi_tx0_pll"; > #clock-cells = <0>; > #phy-cells = <0>; > + drive-strength-microamp = <0x8>; > }; > > dsi0: dsi@1401b000 { > -- > 2.21.0
On Mon, 2020-03-23 at 16:00 -0600, Rob Herring wrote: > On Wed, Mar 11, 2020 at 03:40:29PM +0800, Jitao Shi wrote: > > Add a property to control mipi tx drive current: > > "drive-strength-microamp" > > > > Signed-off-by: Jitao Shi <jitao.shi@mediatek.com> > > --- > > .../devicetree/bindings/display/mediatek/mediatek,dsi.txt | 4 ++++ > > 1 file changed, 4 insertions(+) > > > > diff --git a/Documentation/devicetree/bindings/display/mediatek/mediatek,dsi.txt b/Documentation/devicetree/bindings/display/mediatek/mediatek,dsi.txt > > index a19a6cc375ed..d501f9ff4b1f 100644 > > --- a/Documentation/devicetree/bindings/display/mediatek/mediatek,dsi.txt > > +++ b/Documentation/devicetree/bindings/display/mediatek/mediatek,dsi.txt > > @@ -33,6 +33,9 @@ Required properties: > > - #clock-cells: must be <0>; > > - #phy-cells: must be <0>. > > > > +Optional properties: > > +- drive-strength-microamp: adjust driving current, should be 1 ~ 0xF > > TBC, 1-0xf is in units of microamps? So a max drive strength of 15uA? > Seems a bit low. > The minimum amp is 3000 macroamps, step is 200macroamps. So the drive current is 3000 + 200 * drive-strength-microamp amps. I will update "drive-strength-microamp" define next version. BR Jitao > > + > > Example: > > > > mipi_tx0: mipi-dphy@10215000 { > > @@ -42,6 +45,7 @@ mipi_tx0: mipi-dphy@10215000 { > > clock-output-names = "mipi_tx0_pll"; > > #clock-cells = <0>; > > #phy-cells = <0>; > > + drive-strength-microamp = <0x8>; > > }; > > > > dsi0: dsi@1401b000 { > > -- > > 2.21.0
diff --git a/Documentation/devicetree/bindings/display/mediatek/mediatek,dsi.txt b/Documentation/devicetree/bindings/display/mediatek/mediatek,dsi.txt index a19a6cc375ed..d501f9ff4b1f 100644 --- a/Documentation/devicetree/bindings/display/mediatek/mediatek,dsi.txt +++ b/Documentation/devicetree/bindings/display/mediatek/mediatek,dsi.txt @@ -33,6 +33,9 @@ Required properties: - #clock-cells: must be <0>; - #phy-cells: must be <0>. +Optional properties: +- drive-strength-microamp: adjust driving current, should be 1 ~ 0xF + Example: mipi_tx0: mipi-dphy@10215000 { @@ -42,6 +45,7 @@ mipi_tx0: mipi-dphy@10215000 { clock-output-names = "mipi_tx0_pll"; #clock-cells = <0>; #phy-cells = <0>; + drive-strength-microamp = <0x8>; }; dsi0: dsi@1401b000 {
Add a property to control mipi tx drive current: "drive-strength-microamp" Signed-off-by: Jitao Shi <jitao.shi@mediatek.com> --- .../devicetree/bindings/display/mediatek/mediatek,dsi.txt | 4 ++++ 1 file changed, 4 insertions(+)