Re: [PATCHv8 06/13] I2C: OMAP: Correct I2C revision for OMAP3

[Tony Lindgren <tony-4v6yS6AI5VpBDgjK7y7TUQ@public.gmane.org>]

* Shubhrajyoti D <shubhrajyoti-l0cyMroinI0@public.gmane.org> [120618 07:35]:
> From: Jon Hunter <jon-hunter-l0cyMroinI0@public.gmane.org>
> 
> The OMAP3530 is based upon the same silicon as the OMAP3430 and so the I2C
> revision is the same for 3430 and 3530. However, the OMAP3630 device has the
> same I2C revision as OMAP4. Correct the revision definition to reflect this.
> 
> This patch is based on work done by Jon Hunter <jon-hunter-l0cyMroinI0@public.gmane.org>
> Changes from his patch
> - Update OMAP_I2C_REV_ON_3430 also to reflect that it is same as 3530
...
>  /* timeout waiting for the controller to respond */
>  #define OMAP_I2C_TIMEOUT (msecs_to_jiffies(1000))
> @@ -298,7 +298,7 @@ static int omap_i2c_reset(struct omap_i2c_dev *dev)
>  			omap_i2c_write_reg(dev, OMAP_I2C_SYSC_REG,
>  					   SYSC_AUTOIDLE_MASK);
>  
> -		} else if (dev->rev >= OMAP_I2C_REV_ON_3430) {
> +		} else if (dev->rev >= OMAP_I2C_REV_ON_3430_3530) {
>  			dev->syscstate = SYSC_AUTOIDLE_MASK;
>  			dev->syscstate |= SYSC_ENAWAKEUP_MASK;
>  			dev->syscstate |= (SYSC_IDLEMODE_SMART <<

Having to patch all over the place for these revision defines leads
into unmaintainable code as new SoCs get added.

Please instead just check the revision once during init, then set
up some feature bits like I2C_OMAP_NEEDS_XYZ_RESET that the runtime
code can check.


> @@ -1055,7 +1055,7 @@ omap_i2c_probe(struct platform_device *pdev)
>  	if (dev->flags & OMAP_I2C_FLAG_APPLY_ERRATA_I207)
>  		dev->errata |= I2C_OMAP_ERRATA_I207;
>  
> -	if (dev->rev <= OMAP_I2C_REV_ON_3430)
> +	if (dev->rev <= OMAP_I2C_REV_ON_3430_3530)
>  		dev->errata |= I2C_OMAP_ERRATA_I462;
>  
>  	if (!(dev->flags & OMAP_I2C_FLAG_NO_FIFO)) {
> @@ -1073,7 +1073,7 @@ omap_i2c_probe(struct platform_device *pdev)
>  
>  		dev->fifo_size = (dev->fifo_size / 2);
>  
> -		if (dev->rev >= OMAP_I2C_REV_ON_3530_4430)
> +		if (dev->rev >= OMAP_I2C_REV_ON_3630_4430)
>  			dev->b_hw = 0; /* Disable hardware fixes */
>  		else
>  			dev->b_hw = 1; /* Enable hardware fixes */

That way the code does not need to change when new SoC revisions
get added.

Tony