linux-kernel - Re: [PATCH 2/2] soc: bcm: add PM driver for Broadcom's PMB

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Date:   Mon, 14 Dec 2020 09:00:25 +0100
From:   Rafał Miłecki <rafal@...ecki.pl>
To:     Florian Fainelli <f.fainelli@...il.com>,
        Rafał Miłecki <zajec5@...il.com>,
        Rob Herring <robh+dt@...nel.org>
Cc:     Philipp Zabel <p.zabel@...gutronix.de>,
        "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Kevin Hilman <khilman@...nel.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        devicetree@...r.kernel.org, bcm-kernel-feedback-list@...adcom.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] soc: bcm: add PM driver for Broadcom's PMB

On 12.12.2020 04:26, Florian Fainelli wrote:
>> +
>> +static const struct bcm_pmb_pd_data bcm_pmb_bcm4908_data[] = {
>> +	{ .name = "pcie2", .id = BCM_PMB_PCIE2, .bus = 0, .device = 2, },
>> +	{ .name = "pcie0", .id = BCM_PMB_PCIE0, .bus = 1, .device = 14, },
>> +	{ .name = "pcie1", .id = BCM_PMB_PCIE1, .bus = 1, .device = 15, },
>> +	{ .name = "usb", .id = BCM_PMB_HOST_USB, .bus = 1, .device = 17, },
> 
> Do you have to be more specific and spell out whether this is the host
> controller (xhci) or device (bdc)? If not, then this looks good to me.

I believe I have to and I believe I already do. I used BCM_PMB_HOST_USB
which clearly (I believe) points to the HOST controller.

In 6838 part of pmc_drv.h from Broadcom's SDK I found:

enum {
     USB30_2X_Zone_Common,
     USB30_2X_Zone_USB_Host,
     USB30_2X_Zone_USB_Device,
};

and that's what makes me believe we need to specify HOST explicitly.