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Re: [PATCH 13/13] bcm2835_cprman: put some peripherals of bcm2835 cprman

From: Thomas Huth
Subject: Re: [PATCH 13/13] bcm2835_cprman: put some peripherals of bcm2835 cprman into the 'misc' category
Date: Mon, 16 Nov 2020 15:30:20 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.12.0

On 16/11/2020 14.25, Philippe Mathieu-Daudé wrote:
> Hi Gan,
> On 11/15/20 7:49 PM, Gan Qixin wrote:
>> Some peripherals of bcm2835 cprman have no category, put them into the 'misc'
>> category.
>> Signed-off-by: Gan Qixin <ganqixin@huawei.com>
>> ---
>> Cc: Philippe Mathieu-Daudé <f4bug@amsat.org>
>> ---
>>  hw/misc/bcm2835_cprman.c | 4 ++++
>>  1 file changed, 4 insertions(+)
>> diff --git a/hw/misc/bcm2835_cprman.c b/hw/misc/bcm2835_cprman.c
>> index 7e415a017c..c62958a99e 100644
>> --- a/hw/misc/bcm2835_cprman.c
>> +++ b/hw/misc/bcm2835_cprman.c
>> @@ -136,6 +136,7 @@ static void pll_class_init(ObjectClass *klass, void 
>> *data)
>>      dc->reset = pll_reset;
>>      dc->vmsd = &pll_vmstate;
>> +    set_bit(DEVICE_CATEGORY_MISC, dc->categories);
> Well, this is not an usable device but a part of a bigger device,
> so here we want the opposite: not list this device in any category.
> Maybe we could add a DEVICE_CATEGORY_COMPOSITE for all such QOM
> types so management apps can filter them out? (And so we are sure
> all QOM is classified).
> Thomas, you already dealt with categorizing devices in the past,
> what do you think about this? Who else could help? Maybe add
> someone from libvirt in the thread?

My 0.02 € : Mark the device as user_creatable = false if it can not really
be used by the user with the -device CLI parameter. Then it also does not
need a category. I know Markus will likely have a different opinion, but in
my eyes it's just ugly if we present devices to the users that they can not use.
(By the way, this device here seems to be a decendant of TYPE_SYS_BUS_DEVICE
... shouldn't these show up as user_creatable = false automatically?)


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