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Message-ID: <8c1568e8-8b88-05c3-12ac-46dd77404163@kernel.org>
Date: Thu, 7 Oct 2021 11:03:50 +0300
From: Roger Quadros <rogerq@...nel.org>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
tony@...mide.com
Cc: robh+dt@...nel.org, grygorii.strashko@...com, nm@...com,
lokeshvutla@...com, nsekhar@...com, miquel.raynal@...tlin.com,
devicetree@...r.kernel.org, linux-mtd@...ts.infradead.org,
linux-omap@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 7/8] dt-bindings: memory-controllers: ti,gpmc: Convert
to yaml
Hi Krzysztof,
On 15/09/2021 10:20, Krzysztof Kozlowski wrote:
> On 14/09/2021 14:27, Roger Quadros wrote:
>> Convert omap-gpmc.txt to ti,gpmc.yaml.
>>
>> Signed-off-by: Roger Quadros <rogerq@...nel.org>
>> ---
>> .../bindings/memory-controllers/omap-gpmc.txt | 157 ----------------
>> .../bindings/memory-controllers/ti,gpmc.yaml | 172 ++++++++++++++++++
>> 2 files changed, 172 insertions(+), 157 deletions(-)
>> delete mode 100644 Documentation/devicetree/bindings/memory-controllers/omap-gpmc.txt
>> create mode 100644 Documentation/devicetree/bindings/memory-controllers/ti,gpmc.yaml
>>
>> diff --git a/Documentation/devicetree/bindings/memory-controllers/omap-gpmc.txt b/Documentation/devicetree/bindings/memory-controllers/omap-gpmc.txt
>> deleted file mode 100644
>> index c1359f4d48d7..000000000000
>> --- a/Documentation/devicetree/bindings/memory-controllers/omap-gpmc.txt
>> +++ /dev/null
>> @@ -1,157 +0,0 @@
>> -Device tree bindings for OMAP general purpose memory controllers (GPMC)
>> -
>> -The actual devices are instantiated from the child nodes of a GPMC node.
>> -
>> -Required properties:
>> -
>> - - compatible: Should be set to one of the following:
>> -
>> - ti,omap2420-gpmc (omap2420)
>> - ti,omap2430-gpmc (omap2430)
>> - ti,omap3430-gpmc (omap3430 & omap3630)
>> - ti,omap4430-gpmc (omap4430 & omap4460 & omap543x)
>> - ti,am3352-gpmc (am335x devices)
>> -
>> - - reg: A resource specifier for the register space
>> - (see the example below)
>> - - ti,hwmods: Should be set to "ti,gpmc" until the DT transition is
>> - completed.
>> - - #address-cells: Must be set to 2 to allow memory address translation
>> - - #size-cells: Must be set to 1 to allow CS address passing
>> - - gpmc,num-cs: The maximum number of chip-select lines that controller
>> - can support.
>> - - gpmc,num-waitpins: The maximum number of wait pins that controller can
>> - support.
>> - - ranges: Must be set up to reflect the memory layout with four
>> - integer values for each chip-select line in use:
>> -
>> - <cs-number> 0 <physical address of mapping> <size>
>> -
>> - Currently, calculated values derived from the contents
>> - of the per-CS register GPMC_CONFIG7 (as set up by the
>> - bootloader) are used for the physical address decoding.
>> - As this will change in the future, filling correct
>> - values here is a requirement.
>> - - interrupt-controller: The GPMC driver implements and interrupt controller for
>> - the NAND events "fifoevent" and "termcount" plus the
>> - rising/falling edges on the GPMC_WAIT pins.
>> - The interrupt number mapping is as follows
>> - 0 - NAND_fifoevent
>> - 1 - NAND_termcount
>> - 2 - GPMC_WAIT0 pin edge
>> - 3 - GPMC_WAIT1 pin edge, and so on.
>> - - interrupt-cells: Must be set to 2
>> - - gpio-controller: The GPMC driver implements a GPIO controller for the
>> - GPMC WAIT pins that can be used as general purpose inputs.
>> - 0 maps to GPMC_WAIT0 pin.
>> - - gpio-cells: Must be set to 2
>> -
>> -Required properties when using NAND prefetch dma:
>> - - dmas GPMC NAND prefetch dma channel
>> - - dma-names Must be set to "rxtx"
>> -
>> -Timing properties for child nodes. All are optional and default to 0.
>> -
>> - - gpmc,sync-clk-ps: Minimum clock period for synchronous mode, in picoseconds
>> -
>> - Chip-select signal timings (in nanoseconds) corresponding to GPMC_CONFIG2:
>> - - gpmc,cs-on-ns: Assertion time
>> - - gpmc,cs-rd-off-ns: Read deassertion time
>> - - gpmc,cs-wr-off-ns: Write deassertion time
>> -
>> - ADV signal timings (in nanoseconds) corresponding to GPMC_CONFIG3:
>> - - gpmc,adv-on-ns: Assertion time
>> - - gpmc,adv-rd-off-ns: Read deassertion time
>> - - gpmc,adv-wr-off-ns: Write deassertion time
>> - - gpmc,adv-aad-mux-on-ns: Assertion time for AAD
>> - - gpmc,adv-aad-mux-rd-off-ns: Read deassertion time for AAD
>> - - gpmc,adv-aad-mux-wr-off-ns: Write deassertion time for AAD
>> -
>> - WE signals timings (in nanoseconds) corresponding to GPMC_CONFIG4:
>> - - gpmc,we-on-ns Assertion time
>> - - gpmc,we-off-ns: Deassertion time
>> -
>> - OE signals timings (in nanoseconds) corresponding to GPMC_CONFIG4:
>> - - gpmc,oe-on-ns: Assertion time
>> - - gpmc,oe-off-ns: Deassertion time
>> - - gpmc,oe-aad-mux-on-ns: Assertion time for AAD
>> - - gpmc,oe-aad-mux-off-ns: Deassertion time for AAD
>> -
>> - Access time and cycle time timings (in nanoseconds) corresponding to
>> - GPMC_CONFIG5:
>> - - gpmc,page-burst-access-ns: Multiple access word delay
>> - - gpmc,access-ns: Start-cycle to first data valid delay
>> - - gpmc,rd-cycle-ns: Total read cycle time
>> - - gpmc,wr-cycle-ns: Total write cycle time
>> - - gpmc,bus-turnaround-ns: Turn-around time between successive accesses
>> - - gpmc,cycle2cycle-delay-ns: Delay between chip-select pulses
>> - - gpmc,clk-activation-ns: GPMC clock activation time
>> - - gpmc,wait-monitoring-ns: Start of wait monitoring with regard to valid
>> - data
>> -
>> -Boolean timing parameters. If property is present parameter enabled and
>> -disabled if omitted:
>> - - gpmc,adv-extra-delay: ADV signal is delayed by half GPMC clock
>> - - gpmc,cs-extra-delay: CS signal is delayed by half GPMC clock
>> - - gpmc,cycle2cycle-diffcsen: Add "cycle2cycle-delay" between successive
>> - accesses to a different CS
>> - - gpmc,cycle2cycle-samecsen: Add "cycle2cycle-delay" between successive
>> - accesses to the same CS
>> - - gpmc,oe-extra-delay: OE signal is delayed by half GPMC clock
>> - - gpmc,we-extra-delay: WE signal is delayed by half GPMC clock
>> - - gpmc,time-para-granularity: Multiply all access times by 2
>> -
>> -The following are only applicable to OMAP3+ and AM335x:
>> - - gpmc,wr-access-ns: In synchronous write mode, for single or
>> - burst accesses, defines the number of
>> - GPMC_FCLK cycles from start access time
>> - to the GPMC_CLK rising edge used by the
>> - memory device for the first data capture.
>> - - gpmc,wr-data-mux-bus-ns: In address-data multiplex mode, specifies
>> - the time when the first data is driven on
>> - the address-data bus.
>> -
>> -GPMC chip-select settings properties for child nodes. All are optional.
>> -
>> -- gpmc,burst-length Page/burst length. Must be 4, 8 or 16.
>> -- gpmc,burst-wrap Enables wrap bursting
>> -- gpmc,burst-read Enables read page/burst mode
>> -- gpmc,burst-write Enables write page/burst mode
>> -- gpmc,device-width Total width of device(s) connected to a GPMC
>> - chip-select in bytes. The GPMC supports 8-bit
>> - and 16-bit devices and so this property must be
>> - 1 or 2.
>> -- gpmc,mux-add-data Address and data multiplexing configuration.
>> - Valid values are 1 for address-address-data
>> - multiplexing mode and 2 for address-data
>> - multiplexing mode.
>> -- gpmc,sync-read Enables synchronous read. Defaults to asynchronous
>> - is this is not set.
>> -- gpmc,sync-write Enables synchronous writes. Defaults to asynchronous
>> - is this is not set.
>> -- gpmc,wait-pin Wait-pin used by client. Must be less than
>> - "gpmc,num-waitpins".
>> -- gpmc,wait-on-read Enables wait monitoring on reads.
>> -- gpmc,wait-on-write Enables wait monitoring on writes.
>> -
>> -Example for an AM33xx board:
>> -
>> - gpmc: gpmc@...00000 {
>> - compatible = "ti,am3352-gpmc";
>> - ti,hwmods = "gpmc";
>> - reg = <0x50000000 0x2000>;
>> - interrupts = <100>;
>> - dmas = <&edma 52 0>;
>> - dma-names = "rxtx";
>> - gpmc,num-cs = <8>;
>> - gpmc,num-waitpins = <2>;
>> - #address-cells = <2>;
>> - #size-cells = <1>;
>> - ranges = <0 0 0x08000000 0x10000000>; /* CS0 @addr 0x8000000, size 0x10000000 */
>> - interrupt-controller;
>> - #interrupt-cells = <2>;
>> - gpio-controller;
>> - #gpio-cells = <2>;
>> -
>> - /* child nodes go here */
>> - };
>> diff --git a/Documentation/devicetree/bindings/memory-controllers/ti,gpmc.yaml b/Documentation/devicetree/bindings/memory-controllers/ti,gpmc.yaml
>> new file mode 100644
>> index 000000000000..d6cd39bd3940
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/memory-controllers/ti,gpmc.yaml
>> @@ -0,0 +1,172 @@
>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/memory-controllers/ti,gpmc.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: Texas Instruments GPMC Memory Controller device-tree bindings
>> +
>> +maintainers:
>> + - Tony Lindgren <tony@...mide.com>
>> + - Roger Quadros <rogerq@...nel.org>
>> +
>> +description:
>> + The GPMC is a unified memory controller dedicated for interfacing
>> + with external memory devices like
>> + - Asynchronous SRAM-like memories and ASICs
>> + - Asynchronous, synchronous, and page mode burst NOR flash
>> + - NAND flash
>> + - Pseudo-SRAM devices
>> +
>> +properties:
>> + compatible:
>> + items:
>> + - enum:
>> + - ti,omap2420-gpmc
>> + - ti,omap2430-gpmc
>> + - ti,omap3430-gpmc
>> + - ti,omap4430-gpmc
>> + - ti,am3352-gpmc
>
> How about putting them in alphabetical order?
OK.
>
>> +
>> + reg:
>> + maxItems: 1
>> +
>> + interrupts:
>> + maxItems: 1
>> +
>> + clocks:
>> + maxItems: 1
>> + description: |
>> + Functional clock. Used for bus timing calculations and
>> + GPMC configuration.
>> +
>> + clock-names:
>> + items:
>> + - const: fck
>> +
>> + dmas:
>> + items:
>> + - description: DMA channel for GPMC NAND prefetch
>> +
>> + dma-names:
>> + items:
>> + - const: rxtx
>> +
>> + "#address-cells": true
>> +
>> + "#size-cells": true
>> +
>> + gpmc,num-cs:
>> + description: maximum number of supported chip-select lines.
>> + $ref: /schemas/types.yaml#/definitions/uint32
>> +
>> + gpmc,num-waitpins:
>> + description: maximum number of supported wait pins.
>> + $ref: /schemas/types.yaml#/definitions/uint32
>> +
>> + ranges:
>> + minItems: 1
>> + description: |
>> + Must be set up to reflect the memory layout with four
>> + integer values for each chip-select line in use,
>> + <cs-number> 0 <physical address of mapping> <size>
>> + items:
>> + - description: NAND bank 0
>> + - description: NOR/SRAM bank 0
>> + - description: NOR/SRAM bank 1
>> +
>> + '#interrupt-cells':
>> + const: 2
>> +
>> + interrupt-controller:
>> + description: |
>> + The GPMC driver implements and interrupt controller for
>> + the NAND events "fifoevent" and "termcount" plus the
>> + rising/falling edges on the GPMC_WAIT pins.
>> + The interrupt number mapping is as follows
>> + 0 - NAND_fifoevent
>> + 1 - NAND_termcount
>> + 2 - GPMC_WAIT0 pin edge
>> + 3 - GPMC_WAIT1 pin edge, and so on.
>> +
>> + '#gpio-cells':
>> + const: 2
>> +
>> + gpio-controller:
>> + description: |
>> + The GPMC driver implements a GPIO controller for the
>> + GPMC WAIT pins that can be used as general purpose inputs.
>> + 0 maps to GPMC_WAIT0 pin.
>> +
>> + ti,hwmods:
>> + description:
>> + Name of the HWMOD associated with GPMC. This is for legacy
>> + omap2/3 platforms only.
>> + $ref: /schemas/types.yaml#/definitions/string
>> + deprecated: true
>> +
>> + ti,no-idle-on-init:
>> + description:
>> + Prevent idling the module at init. This is for legacy omap2/3
>> + platforms only.
>> + type: boolean
>> + deprecated: true
>> +
>> +patternProperties:
>> + "@[0-7],[a-f0-9]+$":
>> + type: object
>> + description: |
>> + The child device node represents the device connected to the GPMC
>> + bus. The device can be a NAND chip, SRAM device, NOR device
>> + or an ASIC.
>> +
>> + allOf:
>> + - $ref: "ti,gpmc-child.yaml"
>> +
>> + unevaluatedProperties: false
>> +
>> +required:
>> + - compatible
>> + - reg
>> + - gpmc,num-cs
>> + - gpmc,num-waitpins
>> + - "#address-cells"
>> + - "#size-cells"
>> +
>> +additionalProperties: false
>> +
>> +examples:
>> + - |
>> + #include <dt-bindings/interrupt-controller/arm-gic.h>
>> + #include <dt-bindings/gpio/gpio.h>
>> +
>> + gpmc: memory-controller@...00000 {
>> + compatible = "ti,am3352-gpmc";
>> + reg = <0x50000000 0x2000>;
>> + interrupts = <100>;
>> + clocks = <&l3s_clkctrl>;
>> + clock-names = "fck";
>> + dmas = <&edma 52 0>;
>> + dma-names = "rxtx";
>> + gpmc,num-cs = <8>;
>> + gpmc,num-waitpins = <2>;
>> + #address-cells = <2>;
>> + #size-cells = <1>;
>> + ranges = <0 0 0x08000000 0x10000000>; /* CS0 @addr 0x8000000, size 0x10000000 */
>> + interrupt-controller;
>> + #interrupt-cells = <2>;
>> + gpio-controller;
>> + #gpio-cells = <2>;
>> +
>> + nand@0,0 {
>> + compatible = "ti,omap2-nand";
>> + reg = <0 0 4>;
>> + interrupt-parent = <&gpmc>;
>> + interrupts = <0 IRQ_TYPE_NONE>, /* fifoevent */
>> + <1 IRQ_TYPE_NONE>; /* termcount */
>
> Why these are interrupts of unspecified type (NONE)?
These are not external interrupt pins but internal to the SoC.
So they don't have any meaning for rising/falling edge or low/high level.
>
>> + ti,nand-xfer-type = "prefetch-dma";
>> + ti,nand-ecc-opt = "bch16";
>> + ti,elm-id = <&elm>;
>> + rb-gpios = <&gpmc 0 GPIO_ACTIVE_HIGH>; /* gpmc_wait0 pin */
>> + };
>> + };
>>
>
>
> Best regards,
> Krzysztof
>
cheers,
-roger
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