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> | 2019-04-30 20:02:02 +0200 |
| commit | 3ea780b7a13a70f8d4d4b51c9e76d20903040578 (patch) | |
| tree | 3b371d5e14303f44a3be1729a656edf3cd937d40 | |
| parent | d0f8c46c8694791395d3f77e58e051b259aff188 (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.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 ba95a94c247e..a8a5e38150f7 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 { |