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SubjectRe: [RFC 00/19] Rework support for i.MX8MQ interconnect with devfreq
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Hi,

You missed sending the patches to linux-pm mailing list.
On next version, please send it linux-pm.

Thanks,
Chanwoo Choi

On 21. 2. 20. 오전 12:59, Abel Vesa wrote:
> This has been on my queue for quite some time now. It is more of a
> proof-of-concept.
>
> This rework is done with the compatibility of future i.MX platforms in
> mind. For example, the i.MX8MP platform has multiple NoCs. This
> patchsets prepares the imx interconnect and imx devfreq for that too.
>
> As of now, none of the drivers involved are being used and there is no
> icc consumer on any off the i.MX platforms.
>
> Basically, the steps taken here are the following:
>
> 1. Make the dram_apb clock "reparantable" from kernel.
> This is needed in order to keep track of the actual parent of the
> dram_apb clock in the kernel clock hierarchy. Note that the actual
> switch is done EL3 (TF-A).
>
> 2. Rework the imx-bus so the actual link between the icc and the
> NoCs or the pl301s is not tightly coupled. This allows us to have
> as many NoCs as necessary but also allows as to use the same driver
> for the pl301s. The pl301s have their own clocks too, so we need to
> reduce their rates too.
>
> 3. Rework the imx8m-ddrc driver. Remove the support for dts defined
> OPPs. The EL3 provides those. So instead of havingi to keep the OPP table in
> both EL3 and kernel in sync, we rely on what the EL3 gives us.
> Also, when the platform suspends, the bus needs to be running at highest
> rate, otherwise there is a chance it might not resume anymore.
> By adding the late system sleep PM ops we can handle that easily.
>
> 4. Rework the imx interconnect driver to use the fsl,icc-id instead
> of the robust imx_icc_node_adj_desc for linking with the target node.
> By adding the fsl,icc-id property to all the NoC and pl301 dts nodes,
> we can link each icc node to their corresponding NoC, pl301 or dram.
> Basically, when the imx interconnect platform specific driver probes,
> it will take each node defined for that platform and look-up the
> corresponding dts node based on the id and add that as the qos device.
>
> 5. Added the fec and usdhc as icc consumers. This is just as an example.
> All the other consumers can be added later. Basically, each consumer
> will add a path to their device node and in the driver will have to
> handle that icc path accordingly.
>
> Abel Vesa (19):
> clk: imx8mq: Replace critical with ignore_unused flag for dram_apb
> clock
> dt-bindings: interconnect: imx8mq: Add missing pl301 and SAI ids
> devfreq: imx-bus: Switch governor to powersave
> devfreq: imx-bus: Decouple imx-bus from icc made
> devfreq: imx8m-ddrc: Change governor to powersave
> devfreq: imx8m-ddrc: Use the opps acquired from EL3
> devfreq: imx8m-ddrc: Add late system sleep PM ops
> interconnect: imx: Switch from imx_icc_node_adj_desc to fsl,icc-id
> node assignment
> interconnect: imx8: Remove the imx_icc_node_adj_desc
> interconnect: imx8mq: Add the pl301_per_m and pl301_wakeup nodes and
> subnodes
> interconnect: imx8mq: Add of_match_table
> interconnect: imx: Add imx_icc_get_bw and imx_icc_aggregate functions
> arm64: dts: imx8mq: Add fsl,icc-id property to ddrc node
> arm64: dts: imx8mq: Add fsl,icc-id to noc node
> arm64: dts: imx8mq: Add all pl301 nodes
> arm64: dts: imx8mq: Add the interconnect node
> arm64: dts: imx8mq: Add interconnect properties to icc consumer nodes
> net: ethernet: fec_main: Add interconnect support
> mmc: sdhci-esdhc-imx: Add interconnect support
>
> arch/arm64/boot/dts/freescale/imx8mq.dtsi | 200 +++++++++++++++++++++-
> drivers/clk/imx/clk-imx8mq.c | 2 +-
> drivers/devfreq/imx-bus.c | 42 +----
> drivers/devfreq/imx8m-ddrc.c | 75 +++-----
> drivers/interconnect/imx/imx.c | 92 +++++-----
> drivers/interconnect/imx/imx.h | 19 +-
> drivers/interconnect/imx/imx8mm.c | 32 ++--
> drivers/interconnect/imx/imx8mn.c | 28 +--
> drivers/interconnect/imx/imx8mq.c | 59 ++++---
> drivers/mmc/host/sdhci-esdhc-imx.c | 26 +++
> drivers/net/ethernet/freescale/fec.h | 3 +
> drivers/net/ethernet/freescale/fec_main.c | 19 ++
> include/dt-bindings/interconnect/imx8mq.h | 9 +
> scripts/dtc/fdtoverlay | Bin 0 -> 61280 bytes
> 14 files changed, 393 insertions(+), 213 deletions(-)
> create mode 100755 scripts/dtc/fdtoverlay
>

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