linux-kernel - Re: [PATCH 4/4] memory: jz4780_nemc: Add support for the JZ4725B

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Date:   Fri, 18 Jan 2019 09:18:32 +0100
From:   Boris Brezillon <bbrezillon@...nel.org>
To:     Paul Cercueil <paul@...pouillou.net>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/4] memory: jz4780_nemc: Add support for the JZ4725B

On Thu, 17 Jan 2019 19:45:50 -0300
Paul Cercueil <paul@...pouillou.net> wrote:

> Add support for the JZ4725B SoC from Ingenic.
> 
> Signed-off-by: Paul Cercueil <paul@...pouillou.net>

I don't know anything about the JZ4725B constraints but the code looks
good, so

Reviewed-by: Boris Brezillon <bbrezillon@...nel.org>

> ---
>  drivers/memory/jz4780-nemc.c | 24 +++++++++++++++++++++---
>  1 file changed, 21 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/memory/jz4780-nemc.c b/drivers/memory/jz4780-nemc.c
> index ef3f20e46590..c472a22d6df5 100644
> --- a/drivers/memory/jz4780-nemc.c
> +++ b/drivers/memory/jz4780-nemc.c
> @@ -44,9 +44,14 @@
>  #define NEMC_NFCSR_NFCEn(n)	BIT((((n) - 1) << 1) + 1)
>  #define NEMC_NFCSR_TNFEn(n)	BIT(16 + (n) - 1)
>  
> +struct jz_soc_info {
> +	u8 tas_tah_cycles_max;
> +};
> +
>  struct jz4780_nemc {
>  	spinlock_t lock;
>  	struct device *dev;
> +	const struct jz_soc_info *soc_info;
>  	void __iomem *base;
>  	struct clk *clk;
>  	uint32_t clk_period;
> @@ -202,7 +207,7 @@ static bool jz4780_nemc_configure_bank(struct jz4780_nemc *nemc,
>  	if (of_property_read_u32(node, "ingenic,nemc-tAS", &val) == 0) {
>  		smcr &= ~NEMC_SMCR_TAS_MASK;
>  		cycles = jz4780_nemc_ns_to_cycles(nemc, val);
> -		if (cycles > 15) {
> +		if (cycles > nemc->soc_info->tas_tah_cycles_max) {
>  			dev_err(nemc->dev, "tAS %u is too high (%u cycles)\n",
>  				val, cycles);
>  			return false;
> @@ -214,7 +219,7 @@ static bool jz4780_nemc_configure_bank(struct jz4780_nemc *nemc,
>  	if (of_property_read_u32(node, "ingenic,nemc-tAH", &val) == 0) {
>  		smcr &= ~NEMC_SMCR_TAH_MASK;
>  		cycles = jz4780_nemc_ns_to_cycles(nemc, val);
> -		if (cycles > 15) {
> +		if (cycles > nemc->soc_info->tas_tah_cycles_max) {
>  			dev_err(nemc->dev, "tAH %u is too high (%u cycles)\n",
>  				val, cycles);
>  			return false;
> @@ -278,6 +283,10 @@ static int jz4780_nemc_probe(struct platform_device *pdev)
>  	if (!nemc)
>  		return -ENOMEM;
>  
> +	nemc->soc_info = device_get_match_data(dev);
> +	if (!nemc->soc_info)
> +		return -EINVAL;
> +
>  	spin_lock_init(&nemc->lock);
>  	nemc->dev = dev;
>  
> @@ -370,8 +379,17 @@ static int jz4780_nemc_remove(struct platform_device *pdev)
>  	return 0;
>  }
>  
> +static const struct jz_soc_info jz4725b_soc_info = {
> +	.tas_tah_cycles_max = 7,
> +};
> +
> +static const struct jz_soc_info jz4780_soc_info = {
> +	.tas_tah_cycles_max = 15,
> +};
> +
>  static const struct of_device_id jz4780_nemc_dt_match[] = {
> -	{ .compatible = "ingenic,jz4780-nemc" },
> +	{ .compatible = "ingenic,jz4725b-nemc", .data = &jz4725b_soc_info, },
> +	{ .compatible = "ingenic,jz4780-nemc", .data = &jz4780_soc_info, },
>  	{},
>  };
>