diff options
| author | Christoph Muellner <christoph.muellner@theobroma-systems.com> | 2019-02-28 16:06:40 +0100 |
|---|---|---|
| committer | Christoph Müllner <christophm30@gmail.com> | 2019-04-07 15:23:03 +0200 |
| commit | eca667c3f7f7c6687db7542a7ddced5669e64ff8 (patch) | |
| tree | b5707dca4b61bc76f981b5aca4d241437ca6e2ac | |
| parent | 363162f7c35b462e7a910b22095a262eb2951643 (diff) | |
arm64: dts: rockchip: Decrease emmc-phy's drive impedance on rk3399-puma
The RK3399-Q7 (Puma) requires 33 Ohm drive strength to ensure signal
integrity at HS-400 (200MHz clock, DDR signalling).
A repeated EMC testing run validates that this increase does not
negatively impact EMC compliance (emissions have ample distance to
the regulatory limits).
Signed-off-by: Christoph Muellner <christoph.muellner@theobroma-systems.com>
Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Tested-by: Jakob Unterwurzacher <jakob.unterwurzacher@theobroma-systems.com>
Tested-by: Klaus Goger <klaus.goger@theobroma-systems.com>
| -rw-r--r-- | arch/arm64/boot/dts/rockchip/rk3399-puma.dtsi | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/arm64/boot/dts/rockchip/rk3399-puma.dtsi b/arch/arm64/boot/dts/rockchip/rk3399-puma.dtsi index 0130b9f98c9d..4f75bb6b2f14 100644 --- a/arch/arm64/boot/dts/rockchip/rk3399-puma.dtsi +++ b/arch/arm64/boot/dts/rockchip/rk3399-puma.dtsi @@ -146,6 +146,7 @@ &emmc_phy { status = "okay"; + drive-impedance-ohm = <33>; }; &gmac { |