linux-kernel - Re: [PATCH v2 05/11] i2c: nomadik: use bitops helpers

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Message-ID: <3kooaexx6vhlfwoojcpmnyhagupqwppwenjh4k7ucxbvlfpjn6@e3b7c3ocu6kc>
Date: Sat, 2 Mar 2024 02:31:59 +0100
From: Andi Shyti <andi.shyti@...nel.org>
To: Théo Lebrun <theo.lebrun@...tlin.com>
Cc: Linus Walleij <linus.walleij@...aro.org>, 
	Rob Herring <robh+dt@...nel.org>, Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, 
	Conor Dooley <conor+dt@...nel.org>, Thomas Bogendoerfer <tsbogend@...ha.franken.de>, 
	linux-arm-kernel@...ts.infradead.org, linux-i2c@...r.kernel.org, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-mips@...r.kernel.org, 
	Gregory Clement <gregory.clement@...tlin.com>, Vladimir Kondratiev <vladimir.kondratiev@...ileye.com>, 
	Thomas Petazzoni <thomas.petazzoni@...tlin.com>, Tawfik Bayouk <tawfik.bayouk@...ileye.com>
Subject: Re: [PATCH v2 05/11] i2c: nomadik: use bitops helpers

Hi Theo,

..

> @@ -284,7 +290,7 @@ static int init_hw(struct nmk_i2c_dev *priv)
>  }
>  
>  /* enable peripheral, master mode operation */
> -#define DEFAULT_I2C_REG_CR	((1 << 1) | I2C_CR_PE)
> +#define DEFAULT_I2C_REG_CR	(FIELD_PREP(I2C_CR_OM, 0b01) | I2C_CR_PE)

0b01?

>  /**
>   * load_i2c_mcr_reg() - load the MCR register
> @@ -296,41 +302,42 @@ static u32 load_i2c_mcr_reg(struct nmk_i2c_dev *priv, u16 flags)
>  	u32 mcr = 0;
>  	unsigned short slave_adr_3msb_bits;
>  
> -	mcr |= GEN_MASK(priv->cli.slave_adr, I2C_MCR_A7, 1);
> +	mcr |= FIELD_PREP(I2C_MCR_A7, priv->cli.slave_adr);
>  
>  	if (unlikely(flags & I2C_M_TEN)) {
>  		/* 10-bit address transaction */
> -		mcr |= GEN_MASK(2, I2C_MCR_AM, 12);
> +		mcr |= FIELD_PREP(I2C_MCR_AM, 2);
>  		/*
>  		 * Get the top 3 bits.
>  		 * EA10 represents extended address in MCR. This includes
>  		 * the extension (MSB bits) of the 7 bit address loaded
>  		 * in A7
>  		 */
> -		slave_adr_3msb_bits = (priv->cli.slave_adr >> 7) & 0x7;
> +		slave_adr_3msb_bits = FIELD_GET(GENMASK(9, 7),
> +						priv->cli.slave_adr);

This looks like the only one not having a define. Shall we give a
definition to GENMASK(9, 7)?

>  
> -		mcr |= GEN_MASK(slave_adr_3msb_bits, I2C_MCR_EA10, 8);
> +		mcr |= FIELD_PREP(I2C_MCR_EA10, slave_adr_3msb_bits);

..

> @@ -824,15 +827,16 @@ static irqreturn_t i2c_irq_handler(int irq, void *arg)
>  	 * during the transaction.
>  	 */
>  	case I2C_IT_BERR:
> +	{
> +		u32 sr = readl(priv->virtbase + I2C_SR);

please give a blank line after the variable definition.

Besides, I'd prefer the assignment, when it is a bit more
complex, in a different line, as well.

Rest looks OK, didn't see anything off.

Andi