linux-kernel - Re: [PATCH v4 2/3] clk: bcm: Add BCM2711 DVP driver

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Date:   Thu, 11 Jun 2020 10:06:39 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Maxime Ripard <maxime@...no.tech>,
        Stefan Wahren <stefan.wahren@...e.com>
Cc:     linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        Tim Gover <tim.gover@...pberrypi.com>,
        Dave Stevenson <dave.stevenson@...pberrypi.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Mike Turquette <mturquette@...libre.com>,
        linux-kernel@...r.kernel.org, Phil Elwell <phil@...pberrypi.com>,
        Rob Herring <robh+dt@...nel.org>,
        bcm-kernel-feedback-list@...adcom.com,
        linux-rpi-kernel@...ts.infradead.org,
        Philipp Zabel <p.zabel@...gutronix.de>,
        linux-clk@...r.kernel.org,
        Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
Subject: Re: [PATCH v4 2/3] clk: bcm: Add BCM2711 DVP driver



On 6/11/2020 9:52 AM, Maxime Ripard wrote:
> Hi Stefan,
> 
> On Thu, Jun 11, 2020 at 05:50:30PM +0200, Stefan Wahren wrote:
>>> diff --git a/drivers/clk/bcm/clk-bcm2711-dvp.c b/drivers/clk/bcm/clk-bcm2711-dvp.c
>>> new file mode 100644
>>> index 000000000000..84dbc886e303
>>> --- /dev/null
>>> +++ b/drivers/clk/bcm/clk-bcm2711-dvp.c
>>> @@ -0,0 +1,120 @@
>>> +// SPDX-License-Identifier: GPL-2.0-or-later
>>> +// Copyright 2020 Cerno
>>> +
>>> +#include <linux/clk-provider.h>
>>> +#include <linux/module.h>
>>> +#include <linux/platform_device.h>
>>> +#include <linux/reset-controller.h>
>>> +#include <linux/reset/reset-simple.h>
>>> +
>>> +#define DVP_HT_RPI_SW_INIT	0x04
>>> +#define DVP_HT_RPI_MISC_CONFIG	0x08
>>
>> sorry for not noticing this before. Are these defines specific to the
>> Raspberry Pi, because of RPI?
> 
> I'm not entirely sure to be honest. It's the names that the register
> have, but it's not clear to me if it's something specific to the RPi
> itself, or it just means something else entirely.

My understanding is that this is a wrapper that was done specifically
for the Raspberry Pi usage of that IP block, which is why it has PI in
the name, so this looks good correct, and this does match the internal
register database name.
-- 
Florian