linux-kernel - Re: [PATCH 2/3] mtd: rawnand: stm32_fmc2: add STM32 FMC2 NAND flash controller driver

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Message-ID: <3b37bac8-2616-eb7e-b559-2d73b96bfe28@st.com>
Date:   Tue, 25 Sep 2018 11:14:30 +0200
From:   Christophe Kerello <christophe.kerello@...com>
To:     Boris Brezillon <boris.brezillon@...tlin.com>
CC:     <miquel.raynal@...tlin.com>, <richard@....at>,
        <dwmw2@...radead.org>, <computersforpeace@...il.com>,
        <marek.vasut@...il.com>, <robh+dt@...nel.org>,
        <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 2/3] mtd: rawnand: stm32_fmc2: add STM32 FMC2 NAND flash
 controller driver

Hi Boris,

On 09/24/2018 07:23 PM, Boris Brezillon wrote:
> Hi Christophe,
> 
> On Mon, 17 Sep 2018 17:47:39 +0200
> <christophe.kerello@...com> wrote:
> 
>> +struct stm32_fmc2 {
>> +	struct nand_chip chip;
>> +	struct device *dev;
>> +	void __iomem *io_base;
>> +	void __iomem *data_base[FMC2_MAX_CE];
>> +	void __iomem *cmd_base[FMC2_MAX_CE];
>> +	void __iomem *addr_base[FMC2_MAX_CE];
>> +	phys_addr_t io_phys_addr;
>> +	phys_addr_t data_phys_addr[FMC2_MAX_CE];
>> +	struct clk *clk;
>> +
>> +	struct dma_chan *dma_tx_ch;
>> +	struct dma_chan *dma_rx_ch;
>> +	struct dma_chan *dma_ecc_ch;
>> +	struct sg_table dma_data_sg;
>> +	struct sg_table dma_ecc_sg;
>> +	u8 *ecc_buf;
>> +	int dma_ecc_len;
>> +
>> +	struct completion complete;
>> +	struct completion dma_data_complete;
>> +	struct completion dma_ecc_complete;
>> +
>> +	struct stm32_fmc2_timings timings;
>> +	u8 cs_assigned;
>> +	int cs_sel;
>> +	int ncs;
>> +	int cs_used[FMC2_MAX_CE];
>> +};
> 
> Can we have a clear separation between the NAND controller and NAND
> chip structures. I know you only support a single chip per-controller
> right now, but I prefer to have things clearly separated from the
> beginning.

Yes, I can create 2 structures: one for the controller (stm32_fmc2) and 
one for the NAND chip (stm32_fmc2_nand_chip).

Regards,
Christophe Kerello.

> 
> Regards,
> 
> Boris
>