diff options
| author | Christoph Muellner <christoph.muellner@theobroma-systems.com> | 2019-02-28 16:06:40 +0100 |
|---|---|---|
| committer | Christoph Muellner <christoph.muellner@theobroma-systems.com> | 2019-05-21 18:23:43 +0200 |
| commit | 7e93719067dce93363529a7cc13f478c6b6d9158 (patch) | |
| tree | 4d55613b6718b47218ea9b14723026a6a9865952 | |
| parent | 1560f21c4ffe10824f3a7eab69e6a557f69ec83f (diff) | |
arm64: dts: rockchip: Decrease emmc-phy's drive impedance on rk3399-pumapuma-release-4.4.126-2018-04-12
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.dts | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/arm64/boot/dts/rockchip/rk3399-puma.dts b/arch/arm64/boot/dts/rockchip/rk3399-puma.dts index b8e316eed69d..481a30d182ee 100644 --- a/arch/arm64/boot/dts/rockchip/rk3399-puma.dts +++ b/arch/arm64/boot/dts/rockchip/rk3399-puma.dts @@ -366,6 +366,7 @@ &emmc_phy { status = "okay"; + drive-impedance-ohm = <33>; }; &gmac { |