linux-kernel - Re: [PATCH 3/5] spi: spi-qpic: Add qpic spi nand driver support

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Date: Thu, 15 Feb 2024 18:57:50 +0100
From: Konrad Dybcio <konrad.dybcio@...aro.org>
To: Md Sadre Alam <quic_mdalam@...cinc.com>, andersson@...nel.org,
 broonie@...nel.org, robh@...nel.org, krzysztof.kozlowski+dt@...aro.org,
 conor+dt@...nel.org, miquel.raynal@...tlin.com, richard@....at,
 vigneshr@...com, manivannan.sadhasivam@...aro.org,
 linux-arm-msm@...r.kernel.org, linux-spi@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-mtd@...ts.infradead.org
Cc: quic_srichara@...cinc.com, quic_varada@...cinc.com
Subject: Re: [PATCH 3/5] spi: spi-qpic: Add qpic spi nand driver support

On 15.02.2024 14:48, Md Sadre Alam wrote:
> Add qpic spi nand driver support. The spi nand
> driver currently supported the below commands.
> 
> -- RESET
> -- READ ID
> -- SET FEATURE
> -- GET FEATURE
> -- READ PAGE
> -- WRITE PAGE
> -- ERASE PAGE
> 
> Co-developed-by: Sricharan Ramabadhran <quic_srichara@...cinc.com>
> Signed-off-by: Sricharan Ramabadhran <quic_srichara@...cinc.com>
> Co-developed-by: Varadarajan Narayanan <quic_varada@...cinc.com>
> Signed-off-by: Varadarajan Narayanan <quic_varada@...cinc.com>
> Signed-off-by: Md Sadre Alam <quic_mdalam@...cinc.com>
> ---

[...]

> +void snandc_set_reg(struct qcom_nand_controller *snandc, int offset, u32 val)
> +{
> +	struct nandc_regs *regs = snandc->regs;
> +	__le32 *reg;
> +
> +	reg = offset_to_nandc_reg(regs, offset);
> +
> +	if (reg)
> +		*reg = cpu_to_le32(val);

if (WARN_ON(!reg))
	return;

instead?

This would be tragic..

[...]

> +
> +	ecc_cfg->cfg0 = (cwperpage - 1) << CW_PER_PAGE
> +				| ecc_cfg->cw_data << UD_SIZE_BYTES
> +				| 1 << DISABLE_STATUS_AFTER_WRITE
> +				| 3 << NUM_ADDR_CYCLES
> +				| ecc_cfg->ecc_bytes_hw << ECC_PARITY_SIZE_BYTES_RS
> +				| 0 << STATUS_BFR_READ
> +				| 1 << SET_RD_MODE_AFTER_STATUS
> +				| ecc_cfg->spare_bytes << SPARE_SIZE_BYTES;

Let me introduce you to FIELD_PREP/GET and GENMASK().. Many assignments
in this file could use these.

Konrad