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Date: Sun, 20 Mar 2022 19:51:08 +0000
From: Chris Packham <Chris.Packham@...iedtelesis.co.nz>
To: Krzysztof Kozlowski <krzk@...nel.org>,
"huziji@...vell.com" <huziji@...vell.com>,
"ulf.hansson@...aro.org" <ulf.hansson@...aro.org>,
"robh+dt@...nel.org" <robh+dt@...nel.org>
CC: "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] dt-bindings: mmc: xenon: Convert to JSON schema
On 19/03/22 03:20, Krzysztof Kozlowski wrote:
> On 18/03/2022 04:35, Chris Packham wrote:
>> Convert the marvell,xenon-sdhci binding to JSON schema. This is a fairly
>> direct conversion so there are some requirements that are documented in
>> prose but not currently enforced.
>>
>> Signed-off-by: Chris Packham <chris.packham@...iedtelesis.co.nz>
> Thanks for the change. Several comments below.
>
>> ---
>> .../bindings/mmc/marvell,xenon-sdhci.txt | 173 ------------
>> .../bindings/mmc/marvell,xenon-sdhci.yaml | 252 ++++++++++++++++++
> Invalid path in maintainers, please update the maintainers file.
>
>> 2 files changed, 252 insertions(+), 173 deletions(-)
>> delete mode 100644 Documentation/devicetree/bindings/mmc/marvell,xenon-sdhci.txt
>> create mode 100644 Documentation/devicetree/bindings/mmc/marvell,xenon-sdhci.yaml
>>
>> diff --git a/Documentation/devicetree/bindings/mmc/marvell,xenon-sdhci.txt b/Documentation/devicetree/bindings/mmc/marvell,xenon-sdhci.txt
>> deleted file mode 100644
>> index c51a62d751dc..000000000000
>> --- a/Documentation/devicetree/bindings/mmc/marvell,xenon-sdhci.txt
>> +++ /dev/null
>> @@ -1,173 +0,0 @@
>> -Marvell Xenon SDHCI Controller device tree bindings
>> -This file documents differences between the core mmc properties
>> -described by mmc.txt and the properties used by the Xenon implementation.
>> -
>> -Multiple SDHCs might be put into a single Xenon IP, to save size and cost.
>> -Each SDHC is independent and owns independent resources, such as register sets,
>> -clock and PHY.
>> -Each SDHC should have an independent device tree node.
>> -
>> -Required Properties:
>> -- compatible: should be one of the following
>> - - "marvell,armada-3700-sdhci": For controllers on Armada-3700 SoC.
>> - Must provide a second register area and marvell,pad-type.
>> - - "marvell,armada-ap806-sdhci": For controllers on Armada AP806.
>> - - "marvell,armada-ap807-sdhci": For controllers on Armada AP807.
>> - - "marvell,armada-cp110-sdhci": For controllers on Armada CP110.
>> -
>> -- clocks:
>> - Array of clocks required for SDHC.
>> - Require at least input clock for Xenon IP core. For Armada AP806 and
>> - CP110, the AXI clock is also mandatory.
>> -
>> -- clock-names:
>> - Array of names corresponding to clocks property.
>> - The input clock for Xenon IP core should be named as "core".
>> - The input clock for the AXI bus must be named as "axi".
>> -
>> -- reg:
>> - * For "marvell,armada-3700-sdhci", two register areas.
>> - The first one for Xenon IP register. The second one for the Armada 3700 SoC
>> - PHY PAD Voltage Control register.
>> - Please follow the examples with compatible "marvell,armada-3700-sdhci"
>> - in below.
>> - Please also check property marvell,pad-type in below.
>> -
>> - * For other compatible strings, one register area for Xenon IP.
>> -
>> -Optional Properties:
>> -- marvell,xenon-sdhc-id:
>> - Indicate the corresponding bit index of current SDHC in
>> - SDHC System Operation Control Register Bit[7:0].
>> - Set/clear the corresponding bit to enable/disable current SDHC.
>> - If Xenon IP contains only one SDHC, this property is optional.
>> -
>> -- marvell,xenon-phy-type:
>> - Xenon support multiple types of PHYs.
>> - To select eMMC 5.1 PHY, set:
>> - marvell,xenon-phy-type = "emmc 5.1 phy"
>> - eMMC 5.1 PHY is the default choice if this property is not provided.
>> - To select eMMC 5.0 PHY, set:
>> - marvell,xenon-phy-type = "emmc 5.0 phy"
>> -
>> - All those types of PHYs can support eMMC, SD and SDIO.
>> - Please note that this property only presents the type of PHY.
>> - It doesn't stand for the entire SDHC type or property.
>> - For example, "emmc 5.1 phy" doesn't mean that this Xenon SDHC only
>> - supports eMMC 5.1.
>> -
>> -- marvell,xenon-phy-znr:
>> - Set PHY ZNR value.
>> - Only available for eMMC PHY.
>> - Valid range = [0:0x1F].
>> - ZNR is set as 0xF by default if this property is not provided.
>> -
>> -- marvell,xenon-phy-zpr:
>> - Set PHY ZPR value.
>> - Only available for eMMC PHY.
>> - Valid range = [0:0x1F].
>> - ZPR is set as 0xF by default if this property is not provided.
>> -
>> -- marvell,xenon-phy-nr-success-tun:
>> - Set the number of required consecutive successful sampling points
>> - used to identify a valid sampling window, in tuning process.
>> - Valid range = [1:7].
>> - Set as 0x4 by default if this property is not provided.
>> -
>> -- marvell,xenon-phy-tun-step-divider:
>> - Set the divider for calculating TUN_STEP.
>> - Set as 64 by default if this property is not provided.
>> -
>> -- marvell,xenon-phy-slow-mode:
>> - If this property is selected, transfers will bypass PHY.
>> - Only available when bus frequency lower than 55MHz in SDR mode.
>> - Disabled by default. Please only try this property if timing issues
>> - always occur with PHY enabled in eMMC HS SDR, SD SDR12, SD SDR25,
>> - SD Default Speed and HS mode and eMMC legacy speed mode.
>> -
>> -- marvell,xenon-tun-count:
>> - Xenon SDHC SoC usually doesn't provide re-tuning counter in
>> - Capabilities Register 3 Bit[11:8].
>> - This property provides the re-tuning counter.
>> - If this property is not set, default re-tuning counter will
>> - be set as 0x9 in driver.
>> -
>> -- marvell,pad-type:
>> - Type of Armada 3700 SoC PHY PAD Voltage Controller register.
>> - Only valid when "marvell,armada-3700-sdhci" is selected.
>> - Two types: "sd" and "fixed-1-8v".
>> - If "sd" is selected, SoC PHY PAD is set as 3.3V at the beginning and is
>> - switched to 1.8V when later in higher speed mode.
>> - If "fixed-1-8v" is selected, SoC PHY PAD is fixed 1.8V, such as for eMMC.
>> - Please follow the examples with compatible "marvell,armada-3700-sdhci"
>> - in below.
>> -
>> -Example:
>> -- For eMMC:
>> -
>> - sdhci@...000 {
>> - compatible = "marvell,armada-ap806-sdhci";
>> - reg = <0xaa0000 0x1000>;
>> - interrupts = <GIC_SPI 13 IRQ_TYPE_LEVEL_HIGH>
>> - clocks = <&emmc_clk>,<&axi_clk>;
>> - clock-names = "core", "axi";
>> - bus-width = <4>;
>> - marvell,xenon-phy-slow-mode;
>> - marvell,xenon-tun-count = <11>;
>> - non-removable;
>> - no-sd;
>> - no-sdio;
>> -
>> - /* Vmmc and Vqmmc are both fixed */
>> - };
>> -
>> -- For SD/SDIO:
>> -
>> - sdhci@...000 {
>> - compatible = "marvell,armada-cp110-sdhci";
>> - reg = <0xab0000 0x1000>;
>> - interrupts = <GIC_SPI 55 IRQ_TYPE_LEVEL_HIGH>
>> - vqmmc-supply = <&sd_vqmmc_regulator>;
>> - vmmc-supply = <&sd_vmmc_regulator>;
>> - clocks = <&sdclk>, <&axi_clk>;
>> - clock-names = "core", "axi";
>> - bus-width = <4>;
>> - marvell,xenon-tun-count = <9>;
>> - };
>> -
>> -- For eMMC with compatible "marvell,armada-3700-sdhci":
>> -
>> - sdhci@...000 {
>> - compatible = "marvell,armada-3700-sdhci";
>> - reg = <0xaa0000 0x1000>,
>> - <phy_addr 0x4>;
>> - interrupts = <GIC_SPI 13 IRQ_TYPE_LEVEL_HIGH>
>> - clocks = <&emmcclk>;
>> - clock-names = "core";
>> - bus-width = <8>;
>> - mmc-ddr-1_8v;
>> - mmc-hs400-1_8v;
>> - non-removable;
>> - no-sd;
>> - no-sdio;
>> -
>> - /* Vmmc and Vqmmc are both fixed */
>> -
>> - marvell,pad-type = "fixed-1-8v";
>> - };
>> -
>> -- For SD/SDIO with compatible "marvell,armada-3700-sdhci":
>> -
>> - sdhci@...000 {
>> - compatible = "marvell,armada-3700-sdhci";
>> - reg = <0xab0000 0x1000>,
>> - <phy_addr 0x4>;
>> - interrupts = <GIC_SPI 55 IRQ_TYPE_LEVEL_HIGH>
>> - vqmmc-supply = <&sd_regulator>;
>> - /* Vmmc is fixed */
>> - clocks = <&sdclk>;
>> - clock-names = "core";
>> - bus-width = <4>;
>> -
>> - marvell,pad-type = "sd";
>> - };
>> diff --git a/Documentation/devicetree/bindings/mmc/marvell,xenon-sdhci.yaml b/Documentation/devicetree/bindings/mmc/marvell,xenon-sdhci.yaml
>> new file mode 100644
>> index 000000000000..22d5cbf28042
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/mmc/marvell,xenon-sdhci.yaml
>> @@ -0,0 +1,252 @@
>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>> +%YAML 1.2
>> +---
>> +$id: http://scanmail.trustwave.com/?c=20988&d=qZW04jRMZgk_UFKhuPblJizHEw95We1imujRV7EwpA&u=http%3a%2f%2fdevicetree%2eorg%2fschemas%2fmmc%2fmarvell%2cxenon-sdhci%2eyaml%23
>> +$schema: http://scanmail.trustwave.com/?c=20988&d=qZW04jRMZgk_UFKhuPblJizHEw95We1imriGDeBi9w&u=http%3a%2f%2fdevicetree%2eorg%2fmeta-schemas%2fcore%2eyaml%23
>> +
>> +title: Marvell Xenon SDHCI Controller device tree bindings
> Drop "device tree bindings". Title is about hardware.
>
>> +
>> +description: |
>> + This file documents differences between the core mmc properties described by
> s/mmc/MMC/
>
>> + mmc-controller.yaml and the properties used by the Xenon implementation.
>> +
>> + Multiple SDHCs might be put into a single Xenon IP, to save size and cost.
>> + Each SDHC is independent and owns independent resources, such as register
>> + sets, clock and PHY.
>> +
>> + Each SDHC should have an independent device tree node.
>> +
>> +maintainers:
>> + - Ulf Hansson <ulf.hansson@...aro.org>
>> +
>> +patternProperties:
>> + "^sdhci@[0-9a-f]+$":
>> + type: object
>> + $ref: mmc-controller.yaml
> This is unusual schema... What are you matching here? Are these children
> of this device?
I was going for compatibility with existing uses. The
mmc-controller.yaml schema expects these nodes to be mmc@... . But all
of the existing usages of these bindings use sdhci@... as the primary
node. I could make my example use mmc@ to squash the warning but I was
hoping to be able to do something that didn't make the existing usages
invalid.
> Looks like you wanted allOf. See some existing examples, like:
> Documentation/devicetree/bindings/mmc/brcm,iproc-sdhci.yaml
>
>> +
>> + properties:
>> + compatible:
>> + oneOf:
>> + - const: marvell,armada-3700-sdhci
>> + description: |
>> + Must provide a second register area and marvell,pad-type
>> + - const: marvell,armada-ap806-sdhci
>> + - const: marvell,armada-ap807-sdhci
> This looks wrong. Either these can be standalone properties or in a list
> like in your last items below.
I was trying to allow 'compatible = "marvell,armada-ap806-sdhci";' or
'compatible = "marvell,armada-ap807-sdhci", "marvell,armada-ap806-sdhci";'
>
>> + - const: marvell,armada-cp110-sdhci
>> + - const: marvell,sdhci-xenon
>
> This did not exist before. Separate patches please for additions (with
> explanation why). Maybe some DTS lists this, but then it should be
> individually judged whether the DTS is correct.
Ah OK. I added it because it was in some DTSes but sure I can add it as
a follow up.
>
>> + - items:
>> + - const: marvell,armada-3700-sdhci
>> + - const: marvell,sdhci-xenon
>> + - items:
>> + - const: marvell,armada-ap807-sdhci
>> + - const: marvell,armada-ap806-sdhci
>> +
>> + reg:
>> + minItems: 1
>> + maxItems: 2
>> + description: |
>> + For "marvell,armada-3700-sdhci", two register areas. The first one
>> + for Xenon IP register. The second one for the Armada 3700 SoC PHY PAD
>> + Voltage Control register. Please follow the examples with compatible
>> + "marvell,armada-3700-sdhci" in below.
>> + Please also check property marvell,pad-type in below.
> For this condition and similar one in clocks/clock-names, you need
> if:then:" inside allOf. See for example:
> https://scanmail.trustwave.com/?c=20988&d=qZW04jRMZgk_UFKhuPblJizHEw95We1imreDVuBupQ&u=https%3a%2f%2felixir%2ebootlin%2ecom%2flinux%2fv5%2e17-rc8%2fsource%2fDocumentation%2fdevicetree%2fbindings%2fclock%2fsamsung%2cexynos850-clock%2eyaml%23L56
I'll give it a try. I did wonder if this was something best left as a
follow up after the initial conversion.
>
>> +
>> + For other compatible strings, one register area for Xenon IP.
>> +
>> + clocks:
>> + minItems: 1
>> + maxItems: 2
>> +
>> + clock-names:
>> + minItems: 1
>> + items:
>> + - const: core
>> + - const: axi
>> +
>> + marvell,xenon-sdhc-id:
>> + $ref: /schemas/types.yaml#/definitions/uint32
>> + minimum: 0
>> + maximum: 7
>> + description: |
>> + Indicate the corresponding bit index of current SDHC in SDHC System
>> + Operation Control Register Bit[7:0]. Set/clear the corresponding bit to
>> + enable/disable current SDHC. If Xenon IP contains only one SDHC, this
>> + property is optional.
> Skip all the "this property is optional" because it is obvious from
> "required:" part.
>
>> +
>> + marvell,xenon-phy-type:
>> + enum:
>> + - "emmc 5.1 phy"
>> + - "emmc 5.0 phy"
> ref: string.
>
>> + description: |
>> + Xenon support multiple types of PHYs. To select eMMC 5.1 PHY, set:
>> + marvell,xenon-phy-type = "emmc 5.1 phy" eMMC 5.1 PHY is the default
>> + choice if this property is not provided. To select eMMC 5.0 PHY, set:
>> + marvell,xenon-phy-type = "emmc 5.0 phy"
>> +
>> + All those types of PHYs can support eMMC, SD and SDIO. Please note that
>> + this property only presents the type of PHY. It doesn't stand for the
>> + entire SDHC type or property. For example, "emmc 5.1 phy" doesn't mean
>> + that this Xenon SDHC only supports eMMC 5.1.
>> +
>> + marvell,xenon-phy-znr:
>> + $ref: /schemas/types.yaml#/definitions/uint32
>> + minimum: 0
>> + maximum: 0x1f
>> + default: 0xf
>> + description: |
>> + Set PHY ZNR value.
>> + Only available for eMMC PHY.
>> + Valid range = [0:0x1F].
> Skip "valid range". It's obvious. Same in all other places. In general,
> trim the description from any parts which are now defined in the
> bindings. Previously (in TXT) this has to be mentioned in description,
> but now we have better way - through DT schema.
>
>> + ZNR is set as 0xF by default if this property is not provided.
>> +
>> + marvell,xenon-phy-zpr:
>> + $ref: /schemas/types.yaml#/definitions/uint32
>> + minimum: 0
>> + maximum: 0x1f
>> + default: 0xf
>> + description: |
>> + Set PHY ZPR value.
>> + Only available for eMMC PHY.
>> + Valid range = [0:0x1F].
>> + ZPR is set as 0xF by default if this property is not provided.
>> +
>> + marvell,xenon-phy-nr-success-tun:
>> + $ref: /schemas/types.yaml#/definitions/uint32
>> + minimum: 1
>> + maximum: 7
>> + default: 0x4
>> + description: |
>> + Set the number of required consecutive successful sampling points
>> + used to identify a valid sampling window, in tuning process.
>> + Valid range = [1:7].
>> + Set as 0x4 by default if this property is not provided.
>> +
>> + marvell,xenon-phy-tun-step-divider:
>> + $ref: /schemas/types.yaml#/definitions/uint32
>> + description: |
>> + Set the divider for calculating TUN_STEP.
>> + Set as 64 by default if this property is not provided.
> default: 64
>
>> +
>> + marvell,xenon-phy-slow-mode:
>> + type: boolean
>> + description: |
>> + If this property is selected, transfers will bypass PHY.
>> + Only available when bus frequency lower than 55MHz in SDR mode.
>> + Disabled by default. Please only try this property if timing issues
>> + always occur with PHY enabled in eMMC HS SDR, SD SDR12, SD SDR25,
>> + SD Default Speed and HS mode and eMMC legacy speed mode.
>> +
>> + marvell,xenon-tun-count:
>> + $ref: /schemas/types.yaml#/definitions/uint32
>> + description: |
>> + Xenon SDHC SoC usually doesn't provide re-tuning counter in
>> + Capabilities Register 3 Bit[11:8].
>> + This property provides the re-tuning counter.
>> + If this property is not set, default re-tuning counter will
>> + be set as 0x9 in driver.> +
>> + marvell,pad-type:
>> + enum:
>> + - sd
>> + - fixed-1-8v
>> + description: |
>> + Type of Armada 3700 SoC PHY PAD Voltage Controller register.
>> + Only valid when "marvell,armada-3700-sdhci" is selected.
>> + Two types: "sd" and "fixed-1-8v".
>> + If "sd" is selected, SoC PHY PAD is set as 3.3V at the beginning and is
>> + switched to 1.8V when later in higher speed mode.
>> + If "fixed-1-8v" is selected, SoC PHY PAD is fixed 1.8V, such as for eMMC.
>> + Please follow the examples with compatible "marvell,armada-3700-sdhci"
>> + in below.
>> +
>> + required:
>> + - compatible
>> + - reg
>> + - clocks
>> + - clock-names
>> +
>> + unevaluatedProperties: false
>> +
>> +additionalProperties: false
> This will be gone once you remove this incorrect patternProperties
>
>> +
>> +examples:
>> + - |
>> + // For eMMC
>> +
> Blank line rather after includes, not before.
>
>> + #include <dt-bindings/interrupt-controller/arm-gic.h>
>> + #include <dt-bindings/interrupt-controller/irq.h>
>> + sdhci@...000 {
>> + compatible = "marvell,armada-ap807-sdhci", "marvell,armada-ap806-sdhci";
>> + reg = <0xaa0000 0x1000>;
>> + interrupts = <GIC_SPI 13 IRQ_TYPE_LEVEL_HIGH>;
>> + clocks = <&emmc_clk 0>, <&axi_clk 0>;
>> + clock-names = "core", "axi";
>> + bus-width = <4>;
>> + marvell,xenon-phy-slow-mode;
>> + marvell,xenon-tun-count = <11>;
>> + non-removable;
>> + no-sd;
>> + no-sdio;
>> +
>> + /* Vmmc and Vqmmc are both fixed */
>> + };
>> +
>> + - |
>> + // For SD/SDIO
>> +
>> + #include <dt-bindings/interrupt-controller/arm-gic.h>
>> + #include <dt-bindings/interrupt-controller/irq.h>
>> + sdhci@...000 {
>> + compatible = "marvell,armada-cp110-sdhci";
>> + reg = <0xab0000 0x1000>;
>> + interrupts = <GIC_SPI 55 IRQ_TYPE_LEVEL_HIGH>;
>> + vqmmc-supply = <&sd_vqmmc_regulator>;
>> + vmmc-supply = <&sd_vmmc_regulator>;
>> + clocks = <&sdclk 0>, <&axi_clk 0>;
>> + clock-names = "core", "axi";
>> + bus-width = <4>;
>> + marvell,xenon-tun-count = <9>;
>> + };
>> +
>> + - |
>> + // For eMMC with compatible "marvell,armada-3700-sdhci":
>> +
>> + #include <dt-bindings/interrupt-controller/arm-gic.h>
>> + #include <dt-bindings/interrupt-controller/irq.h>
>> + sdhci@...000 {
>> + compatible = "marvell,armada-3700-sdhci";
>> + reg = <0xaa0000 0x1000>,
>> + <0x17808 0x4>;
>> + interrupts = <GIC_SPI 13 IRQ_TYPE_LEVEL_HIGH>;
>> + clocks = <&emmcclk 0>;
>> + clock-names = "core";
>> + bus-width = <8>;
>> + mmc-ddr-1_8v;
>> + mmc-hs400-1_8v;
>> + non-removable;
>> + no-sd;
>> + no-sdio;
>> +
>> + /* Vmmc and Vqmmc are both fixed */
>> +
>> + marvell,pad-type = "fixed-1-8v";
>> + };
>> +
>> + - |
>> + // For SD/SDIO with compatible "marvell,armada-3700-sdhci":
>> +
>> + #include <dt-bindings/interrupt-controller/arm-gic.h>
>> + #include <dt-bindings/interrupt-controller/irq.h>
>> + sdhci@...000 {
>> + compatible = "marvell,armada-3700-sdhci";
>> + reg = <0xab0000 0x1000>,
>> + <0x17808 0x4>;
>> + interrupts = <GIC_SPI 55 IRQ_TYPE_LEVEL_HIGH>;
>> + vqmmc-supply = <&sd_regulator>;
>> + /* Vmmc is fixed */
>> + clocks = <&sdclk 0>;
>> + clock-names = "core";
>> + bus-width = <4>;
>> +
>> + marvell,pad-type = "sd";
> It looks the same as previous example for SD. Maybe just remove it?
>
>> + };
>
> Best regards,
> Krzysztof
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