Re: [Qemu-devel] [PATCH v2 5/6] misc: add pca9552 LED blinker model

["Cédric Le Goater" <clg@kaod.org>]

On 10/06/2017 05:12 PM, Peter Maydell wrote:
> On 20 September 2017 at 08:01, Cédric Le Goater <clg@kaod.org> wrote:
>> Specs are available here :
>>
>>   https://www.nxp.com/docs/en/data-sheet/PCA9552.pdf
>>
>> This is a simple model supporting the basic registers for led and GPIO
>> mode. The device also supports two blinking rates but not the model
>> yet.
>>
>> Signed-off-by: Cédric Le Goater <clg@kaod.org>
> 
> 
>> --- /dev/null
>> +++ b/include/hw/misc/pca9552.h
>> @@ -0,0 +1,32 @@
>> +/*
>> + * PCA9552 I2C LED blinker
>> + *
>> + * Copyright (c) 2017, IBM Corporation.
>> + *
>> + * This work is licensed under the terms of the GNU GPL, version 2 or
>> + * later. See the COPYING file in the top-level directory.
>> + */
>> +#ifndef PCA9552_H
>> +#define PCA9552_H
>> +
>> +#include "hw/i2c/i2c.h"
>> +
>> +#define TYPE_PCA9552 "pca9552"
>> +#define PCA9552(obj) OBJECT_CHECK(PCA9552State, (obj), TYPE_PCA9552)
>> +
>> +
>> +#define PCA9552_NR_REGS 10
>> +
>> +typedef struct PCA9552State {
>> +    /*< private >*/
>> +    I2CSlave i2c;
>> +    /*< public >*/
>> +
>> +    uint8_t len;
>> +    uint8_t pointer;
>> +    uint8_t buf[1]; /* just to remember how to handle a larger buffer */
> 
> Changing this later is going to be a migration compatibility break
> (or at least a bit painful to keep compat).
> Do we know how big the buffer is supposed to be? 

one. 

> If so it would be best to make it the correct size to start with.

yes I will change that.

Thanks,

C.

> 
>> +
>> +    uint8_t regs[PCA9552_NR_REGS];
>> +} PCA9552State;
> 
> thanks
> -- PMM
>