linux-kernel - Re: [PATCH 07/11] ST SPEAr: Added source files for SPEAr3xx machine family

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Date:	Fri, 12 Mar 2010 10:49:11 +0530
From:	Viresh KUMAR <viresh.kumar@...com>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	Linus Walleij <linus.ml.walleij@...il.com>,
	rajeev-dlh.kumar@...com, shiraz.hashim@...com,
	armando.visconti@...com, ashish.priyadarshi@...com,
	linux-kernel@...r.kernel.org, vipin.kumar@...com, amit.goel@...com,
	deepak.sikri@...com, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 07/11] ST SPEAr: Added source files for SPEAr3xx	machine
 family

On 3/11/2010 4:11 PM, Russell King - ARM Linux wrote:
> On Tue, Mar 09, 2010 at 07:46:10AM +0100, Linus Walleij wrote:
>>> +struct amba_device uart_device = {
>>> +       .dev = {
>>> +               .init_name = "uart",
>>> +               },
>>> +       .res = {
>>> +               .start = SPEAR3XX_ICM1_UART_BASE,
>>> +               .end = SPEAR3XX_ICM1_UART_BASE + SPEAR3XX_ICM1_UART_SIZE - 1,
>>> +               .flags = IORESOURCE_MEM,
>>> +               },
>>> +       .irq = {IRQ_UART, NO_IRQ},
>>> +       .periphid = 0x00041011,
>>> +};
>>
>> You're hardcoding the PrimeCell ID to the ARM version, but I suspect
>> you have an ST derivate with some additional features. If you look in
>> the PL011 driver in drivers/serial/amba-pl011.c you will probably recognize
>> the modified PrimeCell IDs for vendor 0x80 (VENDOR_ST) and I think
>> you might rather need to patch this file with your new periphid and
>> possibly even implement some new extensions (if there are any).
>>
>> What value is actually in the ID registers of your cell? (Just
>> check in some debugger or simply printk() it...)
> 
> There is no need to specify the ID when the device provides it - in fact
> the code will override you by reading the ID from the device if it finds
> it.  The only reason to explicitly provide one is for the very early
> Primecell devices which didn't implement the ID scheme - such as PL010.
> 

It is Removed.
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