linux-kernel - Re: [RFC 01/11] i2c: add quirk structure to describe adapter flaws

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Message-ID: <1421387408.9323.10.camel@mtksdaap41>
Date:	Fri, 16 Jan 2015 13:50:08 +0800
From:	Eddie Huang <eddie.huang@...iatek.com>
To:	Wolfram Sang <wsa@...-dreams.de>
CC:	<linux-i2c@...r.kernel.org>, <linux-mips@...ux-mips.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	<linux-kernel@...r.kernel.org>,
	Ludovic Desroches <ludovic.desroches@...el.com>,
	Yingjoe Chen <yingjoe.chen@...iatek.com>,
	<linuxppc-dev@...ts.ozlabs.org>,
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [RFC 01/11] i2c: add quirk structure to describe adapter flaws

Hi Wolfram,

On Fri, 2015-01-09 at 18:21 +0100, Wolfram Sang wrote:
>  
> + */
> +struct i2c_adapter_quirks {
> +	u64 flags;
> +	int max_num_msgs;
> +	u16 max_write_len;
> +	u16 max_read_len;
> +	u16 max_comb_write_len;
> +	u16 max_comb_read_len;
> +};
> +
> +#define I2C_ADAPTER_QUIRK_COMB_WRITE_FIRST	BIT(0)
> +#define I2C_ADAPTER_QUIRK_COMB_READ_SECOND	BIT(1)
> +#define I2C_ADAPTER_QUIRK_COMB_WRITE_THEN_READ	(I2C_ADAPTER_QUIRK_COMB_WRITE_FIRST | \
> +						I2C_ADAPTER_QUIRK_COMB_READ_SECOND)
> +
>  /*
>   * i2c_adapter is the structure used to identify a physical i2c bus along
>   * with the access algorithms necessary to access it.
> @@ -472,6 +506,7 @@ struct i2c_adapter {
>  	struct list_head userspace_clients;
>  
>  	struct i2c_bus_recovery_info *bus_recovery_info;
> +	struct i2c_adapter_quirks *quirks;
>  };
>  #define to_i2c_adapter(d) container_of(d, struct i2c_adapter, dev)
>  

I suggest to add const.
	const struct i2c_adapter_quirks *quirks;

also, in i2c-core.c, should modify:
	const struct i2c_adapter_quirks *q = adap->quirks;



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