Message-ID: <bf59a2bc-a708-27de-866a-346085dcee7d@canonical.com>
Date:   Tue, 8 Mar 2022 19:03:15 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
To:     Brian Norris <briannorris@...omium.org>,
        MyungJoo Ham <myungjoo.ham@...sung.com>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Rob Herring <robh+dt@...nel.org>
Cc:     Lin Huang <hl@...k-chips.com>, Heiko Stuebner <heiko@...ech.de>,
        Derek Basehore <dbasehore@...omium.org>,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v3 01/15] dt-bindings: devfreq: rk3399_dmc: Convert to
 YAML

On 08/03/2022 01:09, Brian Norris wrote:
> I want to add, deprecate, and bugfix some properties, as well as add the
> first users. This is easier with a proper schema.
> 
> The transformation is mostly straightforward, plus a few notable tweaks:
> 
>  * Renamed rockchip,dram_speed_bin to rockchip,ddr3_speed_bin. The
>    driver code and the example matched, but the description was
>    different. I went with the implementation. Note that this property is
>    also slated for deprecation/deletion in the subsequent patches.
> 
>  * Drop upthreshold and downdifferential properties from the example.
>    These were undocumented (so, wouldn't pass validation), but were
>    representing software properties (governor tweaks). I drop them from
>    the driver in subsequent patches.
> 
>  * Rename clock from pclk_ddr_mon to dmc_clk. The driver, DT example,
>    and all downstream users matched -- the binding definition was the
>    exception. Anyway, "dmc_clk" is a more appropriately generic name.
> 
> Signed-off-by: Brian Norris <briannorris@...omium.org>
> ---
> 
> Changes in v3:
>  * Add |maxItems| for devfreq-events
>  * Improve deprecation notes
> 
> Changes in v2:
>  * rename to 'memory-controller' in example
>  * place 'required' after properties
>  * drop superluous free-form references and repetitions of other
>    bindings
>  * fix for yamllint

Apologies for jumping in late in discussion, but how about moving it to
memory-controllers or interconnect directory? devfreq is Linux specific
and DMC sounds a lot like dynamic memory controller.

> 
>  .../bindings/devfreq/rk3399_dmc.txt           | 212 -------------
>  .../bindings/devfreq/rk3399_dmc.yaml          | 294 ++++++++++++++++++

file name:
rockchip,rk3399-dmc.yaml

>  2 files changed, 294 insertions(+), 212 deletions(-)
>  delete mode 100644 Documentation/devicetree/bindings/devfreq/rk3399_dmc.txt
>  create mode 100644 Documentation/devicetree/bindings/devfreq/rk3399_dmc.yaml
> 
> diff --git a/Documentation/devicetree/bindings/devfreq/rk3399_dmc.txt b/Documentation/devicetree/bindings/devfreq/rk3399_dmc.txt
> deleted file mode 100644
> index 58fc8a6cebc7..000000000000
> --- a/Documentation/devicetree/bindings/devfreq/rk3399_dmc.txt
> +++ /dev/null
> @@ -1,212 +0,0 @@
> -* Rockchip rk3399 DMC (Dynamic Memory Controller) device
> -
> -Required properties:
> -- compatible:		 Must be "rockchip,rk3399-dmc".
> -- devfreq-events:	 Node to get DDR loading, Refer to
> -			 Documentation/devicetree/bindings/devfreq/event/
> -			 rockchip-dfi.txt
> -- clocks:		 Phandles for clock specified in "clock-names" property
> -- clock-names :		 The name of clock used by the DFI, must be
> -			 "pclk_ddr_mon";
> -- operating-points-v2:	 Refer to Documentation/devicetree/bindings/opp/opp-v2.yaml
> -			 for details.
> -- center-supply:	 DMC supply node.
> -- status:		 Marks the node enabled/disabled.
> -- rockchip,pmu:		 Phandle to the syscon managing the "PMU general register
> -			 files".
> -
> -Optional properties:
> -- interrupts:		 The CPU interrupt number. The interrupt specifier
> -			 format depends on the interrupt controller.
> -			 It should be a DCF interrupt. When DDR DVFS finishes
> -			 a DCF interrupt is triggered.
> -- rockchip,pmu:		 Phandle to the syscon managing the "PMU general register
> -			 files".
> -
> -Following properties relate to DDR timing:
> -
> -- rockchip,dram_speed_bin :	  Value reference include/dt-bindings/clock/rk3399-ddr.h,
> -				  it selects the DDR3 cl-trp-trcd type. It must be
> -				  set according to "Speed Bin" in DDR3 datasheet,
> -				  DO NOT use a smaller "Speed Bin" than specified
> -				  for the DDR3 being used.
> -
> -- rockchip,pd_idle :		  Configure the PD_IDLE value. Defines the
> -				  power-down idle period in which memories are
> -				  placed into power-down mode if bus is idle
> -				  for PD_IDLE DFI clock cycles.
> -
> -- rockchip,sr_idle :		  Configure the SR_IDLE value. Defines the
> -				  self-refresh idle period in which memories are
> -				  placed into self-refresh mode if bus is idle
> -				  for SR_IDLE * 1024 DFI clock cycles (DFI
> -				  clocks freq is half of DRAM clock), default
> -				  value is "0".
> -
> -- rockchip,sr_mc_gate_idle :	  Defines the memory self-refresh and controller
> -				  clock gating idle period. Memories are placed
> -				  into self-refresh mode and memory controller
> -				  clock arg gating started if bus is idle for
> -				  sr_mc_gate_idle*1024 DFI clock cycles.
> -
> -- rockchip,srpd_lite_idle :	  Defines the self-refresh power down idle
> -				  period in which memories are placed into
> -				  self-refresh power down mode if bus is idle
> -				  for srpd_lite_idle * 1024 DFI clock cycles.
> -				  This parameter is for LPDDR4 only.
> -
> -- rockchip,standby_idle :	  Defines the standby idle period in which
> -				  memories are placed into self-refresh mode.
> -				  The controller, pi, PHY and DRAM clock will
> -				  be gated if bus is idle for standby_idle * DFI
> -				  clock cycles.
> -
> -- rockchip,dram_dll_dis_freq :	  Defines the DDR3 DLL bypass frequency in MHz.
> -				  When DDR frequency is less than DRAM_DLL_DISB_FREQ,
> -				  DDR3 DLL will be bypassed. Note: if DLL was bypassed,
> -				  the odt will also stop working.
> -
> -- rockchip,phy_dll_dis_freq :	  Defines the PHY dll bypass frequency in
> -				  MHz (Mega Hz). When DDR frequency is less than
> -				  DRAM_DLL_DISB_FREQ, PHY DLL will be bypassed.
> -				  Note: PHY DLL and PHY ODT are independent.
> -
> -- rockchip,ddr3_odt_dis_freq :	  When the DRAM type is DDR3, this parameter defines
> -				  the ODT disable frequency in MHz (Mega Hz).
> -				  when the DDR frequency is  less then ddr3_odt_dis_freq,
> -				  the ODT on the DRAM side and controller side are
> -				  both disabled.
> -
> -- rockchip,ddr3_drv :		  When the DRAM type is DDR3, this parameter defines
> -				  the DRAM side driver strength in ohms. Default
> -				  value is 40.
> -
> -- rockchip,ddr3_odt :		  When the DRAM type is DDR3, this parameter defines
> -				  the DRAM side ODT strength in ohms. Default value
> -				  is 120.
> -
> -- rockchip,phy_ddr3_ca_drv :	  When the DRAM type is DDR3, this parameter defines
> -				  the phy side CA line (incluing command line,
> -				  address line and clock line) driver strength.
> -				  Default value is 40.
> -
> -- rockchip,phy_ddr3_dq_drv :	  When the DRAM type is DDR3, this parameter defines
> -				  the PHY side DQ line (including DQS/DQ/DM line)
> -				  driver strength. Default value is 40.
> -
> -- rockchip,phy_ddr3_odt : 	  When the DRAM type is DDR3, this parameter defines
> -				  the PHY side ODT strength. Default value is 240.
> -
> -- rockchip,lpddr3_odt_dis_freq : When the DRAM type is LPDDR3, this parameter defines
> -				  then ODT disable frequency in MHz (Mega Hz).
> -				  When DDR frequency is less then ddr3_odt_dis_freq,
> -				  the ODT on the DRAM side and controller side are
> -				  both disabled.
> -
> -- rockchip,lpddr3_drv :		  When the DRAM type is LPDDR3, this parameter defines
> -				  the DRAM side driver strength in ohms. Default
> -				  value is 34.
> -
> -- rockchip,lpddr3_odt :		  When the DRAM type is LPDDR3, this parameter defines
> -				  the DRAM side ODT strength in ohms. Default value
> -				  is 240.
> -
> -- rockchip,phy_lpddr3_ca_drv :	  When the DRAM type is LPDDR3, this parameter defines
> -				  the PHY side CA line (including command line,
> -				  address line and clock line) driver strength.
> -				  Default value is 40.
> -
> -- rockchip,phy_lpddr3_dq_drv :	  When the DRAM type is LPDDR3, this parameter defines
> -				  the PHY side DQ line (including DQS/DQ/DM line)
> -				  driver strength. Default value is 40.
> -
> -- rockchip,phy_lpddr3_odt : 	  When dram type is LPDDR3, this parameter define
> -				  the phy side odt strength, default value is 240.
> -
> -- rockchip,lpddr4_odt_dis_freq : When the DRAM type is LPDDR4, this parameter
> -				  defines the ODT disable frequency in
> -				  MHz (Mega Hz). When the DDR frequency is less then
> -				  ddr3_odt_dis_freq, the ODT on the DRAM side and
> -				  controller side are both disabled.
> -
> -- rockchip,lpddr4_drv :		  When the DRAM type is LPDDR4, this parameter defines
> -				  the DRAM side driver strength in ohms. Default
> -				  value is 60.
> -
> -- rockchip,lpddr4_dq_odt : 	  When the DRAM type is LPDDR4, this parameter defines
> -				  the DRAM side ODT on DQS/DQ line strength in ohms.
> -				  Default value is 40.
> -
> -- rockchip,lpddr4_ca_odt :	  When the DRAM type is LPDDR4, this parameter defines
> -				  the DRAM side ODT on CA line strength in ohms.
> -				  Default value is 40.
> -
> -- rockchip,phy_lpddr4_ca_drv :	  When the DRAM type is LPDDR4, this parameter defines
> -				  the PHY side CA line (including command address
> -				  line) driver strength. Default value is 40.
> -
> -- rockchip,phy_lpddr4_ck_cs_drv : When the DRAM type is LPDDR4, this parameter defines
> -				  the PHY side clock line and CS line driver
> -				  strength. Default value is 80.
> -
> -- rockchip,phy_lpddr4_dq_drv :	  When the DRAM type is LPDDR4, this parameter defines
> -				  the PHY side DQ line (including DQS/DQ/DM line)
> -				  driver strength. Default value is 80.
> -
> -- rockchip,phy_lpddr4_odt :	  When the DRAM type is LPDDR4, this parameter defines
> -				  the PHY side ODT strength. Default value is 60.
> -
> -Example:
> -	dmc_opp_table: dmc_opp_table {
> -		compatible = "operating-points-v2";
> -
> -		opp00 {
> -			opp-hz = /bits/ 64 <300000000>;
> -			opp-microvolt = <900000>;
> -		};
> -		opp01 {
> -			opp-hz = /bits/ 64 <666000000>;
> -			opp-microvolt = <900000>;
> -		};
> -	};
> -
> -	dmc: dmc {
> -		compatible = "rockchip,rk3399-dmc";
> -		devfreq-events = <&dfi>;
> -		interrupts = <GIC_SPI 1 IRQ_TYPE_LEVEL_HIGH>;
> -		clocks = <&cru SCLK_DDRC>;
> -		clock-names = "dmc_clk";
> -		operating-points-v2 = <&dmc_opp_table>;
> -		center-supply = <&ppvar_centerlogic>;
> -		upthreshold = <15>;
> -		downdifferential = <10>;
> -		rockchip,ddr3_speed_bin = <21>;
> -		rockchip,pd_idle = <0x40>;
> -		rockchip,sr_idle = <0x2>;
> -		rockchip,sr_mc_gate_idle = <0x3>;
> -		rockchip,srpd_lite_idle	= <0x4>;
> -		rockchip,standby_idle = <0x2000>;
> -		rockchip,dram_dll_dis_freq = <300>;
> -		rockchip,phy_dll_dis_freq = <125>;
> -		rockchip,auto_pd_dis_freq = <666>;
> -		rockchip,ddr3_odt_dis_freq = <333>;
> -		rockchip,ddr3_drv = <40>;
> -		rockchip,ddr3_odt = <120>;
> -		rockchip,phy_ddr3_ca_drv = <40>;
> -		rockchip,phy_ddr3_dq_drv = <40>;
> -		rockchip,phy_ddr3_odt = <240>;
> -		rockchip,lpddr3_odt_dis_freq = <333>;
> -		rockchip,lpddr3_drv = <34>;
> -		rockchip,lpddr3_odt = <240>;
> -		rockchip,phy_lpddr3_ca_drv = <40>;
> -		rockchip,phy_lpddr3_dq_drv = <40>;
> -		rockchip,phy_lpddr3_odt = <240>;
> -		rockchip,lpddr4_odt_dis_freq = <333>;
> -		rockchip,lpddr4_drv = <60>;
> -		rockchip,lpddr4_dq_odt = <40>;
> -		rockchip,lpddr4_ca_odt = <40>;
> -		rockchip,phy_lpddr4_ca_drv = <40>;
> -		rockchip,phy_lpddr4_ck_cs_drv = <80>;
> -		rockchip,phy_lpddr4_dq_drv = <80>;
> -		rockchip,phy_lpddr4_odt = <60>;
> -	};
> diff --git a/Documentation/devicetree/bindings/devfreq/rk3399_dmc.yaml b/Documentation/devicetree/bindings/devfreq/rk3399_dmc.yaml
> new file mode 100644
> index 000000000000..ddddddc5c6fb
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/devfreq/rk3399_dmc.yaml
> @@ -0,0 +1,294 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +# %YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/devfreq/rk3399_dmc.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Rockchip rk3399 DMC (Dynamic Memory Controller) device
> +
> +maintainers:
> +  - Brian Norris <briannorris@...omium.org>
> +
> +properties:
> +  compatible:
> +    enum:
> +      - rockchip,rk3399-dmc
> +
> +  devfreq-events:
> +    $ref: /schemas/types.yaml#/definitions/phandle-array
> +    minItems: 1
> +    maxItems: 1

Rob previously asked about max, but it seems it is only one phandle,
right? Then the type - 'phandle'.

> +    description:
> +      Node to get DDR loading. Refer to
> +      Documentation/devicetree/bindings/devfreq/event/rockchip-dfi.txt.
> +
> +  clocks:
> +    maxItems: 1
> +
> +  clock-names:
> +    items:
> +      - const: dmc_clk
> +
> +  operating-points-v2: true
> +
> +  center-supply:
> +    description:
> +      DMC regulator supply.
> +
> +  rockchip,pmu:
> +    $ref: /schemas/types.yaml#/definitions/phandle
> +    description:
> +      Phandle to the syscon managing the "PMU general register files".
> +
> +  interrupts:
> +    maxItems: 1
> +    description:
> +      The CPU interrupt number. It should be a DCF interrupt. When DDR DVFS
> +      finishes, a DCF interrupt is triggered.
> +
> +  rockchip,ddr3_speed_bin:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description:
> +      For values, reference include/dt-bindings/clock/rk3399-ddr.h. Selects the
> +      DDR3 cl-trp-trcd type. It must be set according to "Speed Bin" in DDR3
> +      datasheet; DO NOT use a smaller "Speed Bin" than specified for the DDR3
> +      being used.
> +
> +  rockchip,pd_idle:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description:
> +      Configure the PD_IDLE value. Defines the power-down idle period in which
> +      memories are placed into power-down mode if bus is idle for PD_IDLE DFI
> +      clock cycles.
> +
> +  rockchip,sr_idle:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description:
> +      Configure the SR_IDLE value. Defines the self-refresh idle period in
> +      which memories are placed into self-refresh mode if bus is idle for
> +      SR_IDLE * 1024 DFI clock cycles (DFI clocks freq is half of DRAM clock).
> +      Default value is "0".
> +
> +  rockchip,sr_mc_gate_idle:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description:
> +      Defines the memory self-refresh and controller clock gating idle period.
> +      Memories are placed into self-refresh mode and memory controller clock
> +      arg gating started if bus is idle for sr_mc_gate_idle*1024 DFI clock
> +      cycles.
> +
> +  rockchip,srpd_lite_idle:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description:
> +      Defines the self-refresh power down idle period in which memories are
> +      placed into self-refresh power down mode if bus is idle for
> +      srpd_lite_idle * 1024 DFI clock cycles. This parameter is for LPDDR4
> +      only.
> +
> +  rockchip,standby_idle:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description:
> +      Defines the standby idle period in which memories are placed into
> +      self-refresh mode. The controller, pi, PHY and DRAM clock will be gated
> +      if bus is idle for standby_idle * DFI clock cycles.
> +
> +  rockchip,dram_dll_dis_freq:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description: |
> +      Defines the DDR3 DLL bypass frequency in MHz. When DDR frequency is less
> +      than DRAM_DLL_DISB_FREQ, DDR3 DLL will be bypassed.
> +      Note: if DLL was bypassed, the odt will also stop working.
> +
> +  rockchip,phy_dll_dis_freq:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description: |
> +      Defines the PHY dll bypass frequency in MHz (Mega Hz). When DDR frequency
> +      is less than DRAM_DLL_DISB_FREQ, PHY DLL will be bypassed.
> +      Note: PHY DLL and PHY ODT are independent.
> +
> +  rockchip,auto_pd_dis_freq:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description:
> +      Defines the auto PD disable frequency in MHz.
> +
> +  rockchip,ddr3_odt_dis_freq:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description:
> +      When the DRAM type is DDR3, this parameter defines the ODT disable
> +      frequency in MHz (Mega Hz). When the DDR frequency is less then
> +      ddr3_odt_dis_freq, the ODT on the DRAM side and controller side are both
> +      disabled.
> +
> +  rockchip,ddr3_drv:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description:
> +      When the DRAM type is DDR3, this parameter defines the DRAM side drive
> +      strength in ohms. Default value is 40.
> +
> +  rockchip,ddr3_odt:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description:
> +      When the DRAM type is DDR3, this parameter defines the DRAM side ODT
> +      strength in ohms. Default value is 120.

Here and in all other places - instead of describing default value in
description, just add "default: 120".

> +
> +  rockchip,phy_ddr3_ca_drv:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description:
> +      When the DRAM type is DDR3, this parameter defines the phy side CA line
> +      (incluing command line, address line and clock line) drive strength.
> +      Default value is 40.
> +


Best regards,
Krzysztof

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