linux-kernel - Re: [PATCH v2 1/3] dt-bindings: mtd: stm32_fmc2: add STM32 FMC2 NAND controller documentation

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Date:   Mon, 15 Oct 2018 09:39:15 +0200
From:   Christophe Kerello <christophe.kerello@...com>
To:     Rob Herring <robh@...nel.org>
CC:     <boris.brezillon@...tlin.com>, <miquel.raynal@...tlin.com>,
        <richard@....at>, <dwmw2@...radead.org>,
        <computersforpeace@...il.com>, <marek.vasut@...il.com>,
        <mark.rutland@....com>, <linux-mtd@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>
Subject: Re: [PATCH v2 1/3] dt-bindings: mtd: stm32_fmc2: add STM32 FMC2 NAND
 controller documentation



On 10/12/2018 10:32 PM, Rob Herring wrote:
> On Fri, Oct 05, 2018 at 11:41:58AM +0200, christophe.kerello@...com wrote:
>> From: Christophe Kerello <christophe.kerello@...com>
>>
>> This patch adds the documentation of the device tree bindings for the STM32
>> FMC2 NAND controller.
>>
>> Signed-off-by: Christophe Kerello <christophe.kerello@...com>
>> ---
>>   .../devicetree/bindings/mtd/stm32-fmc2-nand.txt    | 59 ++++++++++++++++++++++
>>   1 file changed, 59 insertions(+)
>>   create mode 100644 Documentation/devicetree/bindings/mtd/stm32-fmc2-nand.txt
>>
>> diff --git a/Documentation/devicetree/bindings/mtd/stm32-fmc2-nand.txt b/Documentation/devicetree/bindings/mtd/stm32-fmc2-nand.txt
>> new file mode 100644
>> index 0000000..b620176
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/mtd/stm32-fmc2-nand.txt
>> @@ -0,0 +1,59 @@
>> +STMicroelectronics Flexible Memory Controller 2 (FMC2)
>> +NAND Interface
>> +
>> +Required properties:
>> +- compatible: Should be one of:
>> +              * st,stm32mp15-fmc2
>> +- reg: NAND flash controller memory areas.
>> +       First region contains the register location.
>> +       Regions 2 to 4 respectively contain the data, command,
>> +       and address space for CS0.
>> +       Regions 5 to 7 contain the same areas for CS1.
>> +- interrupts: The interrupt number
>> +- pinctrl-0: Standard Pinctrl phandle (see: pinctrl/pinctrl-bindings.txt)
>> +- clocks: Use common clock framework
> 
> How many? 'common clock framework' is a Linux thing, not part of
> bindings.
> 

Hi Rob,

Only one clock is needed.
I will replace this comment by:
  - clocks: the clock needed by the NAND flash controller.

Regards,
Christophe Kerello.

>> +
>> +Optional properties:
>> +- resets: Reference to a reset controller asserting the FMC controller
>> +- dmas: DMA specifiers (see: dma/stm32-mdma.txt)
>> +- dma-names: Must be "tx", "rx" and "ecc"
>> +
>> +Optional children nodes:
>> +Children nodes represent the available NAND chips.
>> +
>> +Optional properties:
>> +- nand-on-flash-bbt: see nand.txt
>> +- nand-ecc-strength: see nand.txt
>> +- nand-ecc-step-size: see nand.txt
>> +
>> +The following ECC strength and step size are currently supported:
>> + - nand-ecc-strength = <1>, nand-ecc-step-size = <512> (Hamming)
>> + - nand-ecc-strength = <4>, nand-ecc-step-size = <512> (BCH4)
>> + - nand-ecc-strength = <8>, nand-ecc-step-size = <512> (BCH8) (default)
>> +
>> +Example:
>> +
>> +	fmc: nand-controller@...02000 {
>> +		compatible = "st,stm32mp15-fmc2";
>> +		reg = <0x58002000 0x1000>,
>> +		      <0x80000000 0x1000>,
>> +		      <0x88010000 0x1000>,
>> +		      <0x88020000 0x1000>,
>> +		      <0x81000000 0x1000>,
>> +		      <0x89010000 0x1000>,
>> +		      <0x89020000 0x1000>;
>> +		interrupts = <GIC_SPI 48 IRQ_TYPE_LEVEL_HIGH>;
>> +		clocks = <&rcc FMC_K>;
>> +		resets = <&rcc FMC_R>;
>> +		pinctrl-names = "default";
>> +		pinctrl-0 = <&fmc_pins_a>;
>> +		#address-cells = <1>;
>> +		#size-cells = <0>;
>> +
>> +		nand@0 {
>> +			reg = <0>;
>> +			nand-on-flash-bbt;
>> +			#address-cells = <1>;
>> +			#size-cells = <1>;
>> +		};
>> +	};
>> -- 
>> 1.9.1
>>