public-mirrors/linux
1
0
Fork 0
mirror of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git synced 2025-09-18 22:14:16 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

arm64: dts: imx8mq: disable DDRC node by default

Browse source 
Without a OPP table or a downstream TF-A running on the system the DDRC will
fail to probe, as it has no means to scale the DRAM frequency in that case.
This however will block the bus scaling driver to come up and this in turn
prevents other devices that hook into the interconnect from probing.

If the DDRC is disabled, the interconnect driver will simply ignore it. As
most systems don't want to scale the DRAM frequency, disable the node by
default and only enable it on the systems that actually uses this
capability and provides a valid OPP table in the DT.

Signed-off-by: Lucas Stach <dev@lynxeye.de>
Reviewed-by: Fabio Estevam <festevam@gmail.com>
Acked-by: Martin Kepplinger <martin.kepplinger@puri.sm>
Reviewed-by: Guido Günther <agx@sigxcpu.org>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
This commit is contained in:
Lucas Stach 2021-12-18 19:18:08 +01:00 • committed by Shawn Guo
parent 58497d7a13
commit 0bcc4bf063
3 changed files with 3 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

1
arch/arm64/boot/dts/freescale/imx8mq-evk.dts
View file

@ -123,6 +123,7 @@
&ddrc {
operating-points-v2 = <&ddrc_opp_table>;
status = "okay";
ddrc_opp_table: opp-table {
compatible = "operating-points-v2";

1
arch/arm64/boot/dts/freescale/imx8mq-librem5.dtsi
View file

@ -278,6 +278,7 @@
&ddrc {
operating-points-v2 = <&ddrc_opp_table>;
status = "okay";
ddrc_opp_table: opp-table {
compatible = "operating-points-v2";

1
arch/arm64/boot/dts/freescale/imx8mq.dtsi
View file

@ -1579,6 +1579,7 @@
<&clk IMX8MQ_DRAM_PLL_OUT>,
<&clk IMX8MQ_CLK_DRAM_ALT>,
<&clk IMX8MQ_CLK_DRAM_APB>;
status = "disabled";
};
ddr-pmu@3d800000 {