linux-kernel - Re: [PATCH 2/2] mtd: rawnand: marvell: add support for AC5 SoC

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Message-ID: <20230531093752.17fbeb1b@xps-13>
Date:   Wed, 31 May 2023 09:37:52 +0200
From:   Miquel Raynal <miquel.raynal@...tlin.com>
To:     Chris Packham <chris.packham@...iedtelesis.co.nz>
Cc:     richard@....at, vigneshr@...com, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
        arnd@...db.de, daniel.lezcano@...aro.org,
        neil.armstrong@...aro.org, f.fainelli@...il.com,
        christophe.kerello@...s.st.com, liang.yang@...ogic.com,
        jdelvare@...e.de, linux-mtd@...ts.infradead.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] mtd: rawnand: marvell: add support for AC5 SoC

Hi Chris,

chris.packham@...iedtelesis.co.nz wrote on Wed, 31 May 2023 14:58:47
+1200:

> Add support for the AC5/AC5X SoC from Marvell. The NFC on this SoC only
> supports SDR modes up to 3.

Strange!

But alright, I'm okay with the series.

I'll put it aside waiting for all binding changes to be acked (yaml
conversion series + this one) and then I'll apply everything.

> Marvell's SDK includes some predefined values for the ndtr registers.
> These haven't been incorporated as the existing code seems to get good
> values based on measurements taken with an oscilloscope.

Good :)

By the way did you sort the timings question on 8k?

> Signed-off-by: Chris Packham <chris.packham@...iedtelesis.co.nz>
> ---
>  drivers/mtd/nand/raw/Kconfig        |  2 +-
>  drivers/mtd/nand/raw/marvell_nand.c | 16 ++++++++++++++++
>  2 files changed, 17 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/mtd/nand/raw/Kconfig b/drivers/mtd/nand/raw/Kconfig
> index b523354dfb00..0f4cbb497010 100644
> --- a/drivers/mtd/nand/raw/Kconfig
> +++ b/drivers/mtd/nand/raw/Kconfig
> @@ -160,7 +160,7 @@ config MTD_NAND_MARVELL
>  	  including:
>  	  - PXA3xx processors (NFCv1)
>  	  - 32-bit Armada platforms (XP, 37x, 38x, 39x) (NFCv2)
> -	  - 64-bit Aramda platforms (7k, 8k) (NFCv2)
> +	  - 64-bit Aramda platforms (7k, 8k, ac5) (NFCv2)
>  
>  config MTD_NAND_SLC_LPC32XX
>  	tristate "NXP LPC32xx SLC NAND controller"
> diff --git a/drivers/mtd/nand/raw/marvell_nand.c b/drivers/mtd/nand/raw/marvell_nand.c
> index 30c15e4e1cc0..b9a8dd324211 100644
> --- a/drivers/mtd/nand/raw/marvell_nand.c
> +++ b/drivers/mtd/nand/raw/marvell_nand.c
> @@ -375,6 +375,7 @@ static inline struct marvell_nand_chip_sel *to_nand_sel(struct marvell_nand_chip
>   *			BCH error detection and correction algorithm,
>   *			NDCB3 register has been added
>   * @use_dma:		Use dma for data transfers
> + * @max_mode_number:	Maximum timing mode supported by the controller
>   */
>  struct marvell_nfc_caps {
>  	unsigned int max_cs_nb;
> @@ -383,6 +384,7 @@ struct marvell_nfc_caps {
>  	bool legacy_of_bindings;
>  	bool is_nfcv2;
>  	bool use_dma;
> +	unsigned int max_mode_number;
>  };
>  
>  /**
> @@ -2376,6 +2378,9 @@ static int marvell_nfc_setup_interface(struct nand_chip *chip, int chipnr,
>  	if (IS_ERR(sdr))
>  		return PTR_ERR(sdr);
>  
> +	if (nfc->caps->max_mode_number && nfc->caps->max_mode_number < conf->timings.mode)
> +		return -EOPNOTSUPP;
> +
>  	/*
>  	 * SDR timings are given in pico-seconds while NFC timings must be
>  	 * expressed in NAND controller clock cycles, which is half of the
> @@ -3073,6 +3078,13 @@ static const struct marvell_nfc_caps marvell_armada_8k_nfc_caps = {
>  	.is_nfcv2 = true,
>  };
>  
> +static const struct marvell_nfc_caps marvell_ac5_caps = {
> +	.max_cs_nb = 2,
> +	.max_rb_nb = 1,
> +	.is_nfcv2 = true,
> +	.max_mode_number = 3,
> +};
> +
>  static const struct marvell_nfc_caps marvell_armada370_nfc_caps = {
>  	.max_cs_nb = 4,
>  	.max_rb_nb = 2,
> @@ -3121,6 +3133,10 @@ static const struct of_device_id marvell_nfc_of_ids[] = {
>  		.compatible = "marvell,armada-8k-nand-controller",
>  		.data = &marvell_armada_8k_nfc_caps,
>  	},
> +	{
> +		.compatible = "marvell,ac5-nand-controller",
> +		.data = &marvell_ac5_caps,
> +	},
>  	{
>  		.compatible = "marvell,armada370-nand-controller",
>  		.data = &marvell_armada370_nfc_caps,


Thanks,
Miquèl