linux-kernel - Re: [PATCH v2 2/2] checks: Improve i2c reg property checking

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Message-ID: <20200528183115.05b2519a@canb.auug.org.au>
Date:   Thu, 28 May 2020 18:31:15 +1000
From:   Stephen Rothwell <sfr@...b.auug.org.au>
To:     Joel Stanley <joel@....id.au>
Cc:     devicetree-compiler@...r.kernel.org,
        David Gibson <david@...son.dropbear.id.au>,
        linux-kernel@...r.kernel.org, Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH v2 2/2] checks: Improve i2c reg property checking

Hi Joel,

On Thu, 28 May 2020 16:50:37 +0930 Joel Stanley <joel@....id.au> wrote:
>
>  
>  #define I2C_OWN_SLAVE_ADDRESS	(1 << 30)
> +#define I2C_TEN_BIT_ADDRESS	(1 << 31)
>  
>  static void check_i2c_bus_reg(struct check *c, struct dt_info *dti, struct node *node)
>  {
> @@ -1057,10 +1058,13 @@ static void check_i2c_bus_reg(struct check *c, struct dt_info *dti, struct node
>  		reg = fdt32_to_cpu(*(cells++));
>  		/* Ignore I2C_OWN_SLAVE_ADDRESS */
>  		reg &= ~I2C_OWN_SLAVE_ADDRESS;
> -		if (reg > 0x3ff)
> +
> +		if ((reg & I2C_TEN_BIT_ADDRESS) && reg > 0x3ff)

Shouldn't this be

		if ((reg & I2C_TEN_BIT_ADDRESS) && ((reg & ~I2C_TEN_BIT_ADDRESS) > 0x3ff))

-- 
Cheers,
Stephen Rothwell

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