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[209.85.166.53]) by smtp.gmail.com with ESMTPSA id y7sm845380iov.22.2021.11.17.16.11.47 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 17 Nov 2021 16:11:47 -0800 (PST) Received: by mail-io1-f53.google.com with SMTP id w22so5694341ioa.1 for ; Wed, 17 Nov 2021 16:11:47 -0800 (PST) X-Received: by 2002:a6b:440f:: with SMTP id r15mr14131151ioa.128.1637194307041; Wed, 17 Nov 2021 16:11:47 -0800 (PST) MIME-Version: 1.0 References: <20211116200739.924401-1-mka@chromium.org> <20211116120642.v17.1.I7c9a1f1d6ced41dd8310e8a03da666a32364e790@changeid> In-Reply-To: <20211116120642.v17.1.I7c9a1f1d6ced41dd8310e8a03da666a32364e790@changeid> From: Doug Anderson Date: Wed, 17 Nov 2021 16:11:34 -0800 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [PATCH v17 1/7] usb: misc: Add onboard_usb_hub driver To: Matthias Kaehlcke Cc: Greg Kroah-Hartman , Alan Stern , Rob Herring , Frank Rowand , Mathias Nyman , Felipe Balbi , linux-kernel@vger.kernel.org, Krzysztof Kozlowski , Stephen Boyd , Peter Chen , linux-usb@vger.kernel.org, devicetree@vger.kernel.org, Roger Quadros , Michal Simek , Ravi Chandra Sadineni , Bastien Nocera Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, On Tue, Nov 16, 2021 at 12:07 PM Matthias Kaehlcke wrote: > > --- a/drivers/usb/misc/Kconfig > +++ b/drivers/usb/misc/Kconfig > @@ -284,3 +284,20 @@ config BRCM_USB_PINMAP > This option enables support for remapping some USB external > signals, which are typically on dedicated pins on the chip, > to any gpio. > + > +config USB_ONBOARD_HUB > + tristate "Onboard USB hub support" Aren't you back to shenanigans now that you're being called straight from the USB core? What if you're a module and the USB core is builtin? It can't call you, right? ...or what if you're builtin but the USB core is a module (yeah, I know that sounds insane but I don't think anything technically prevents it)? Can you just add a dependency here such that if the USB core is a module that you're a module and if the USB core is builtin that you're builtin? > +void onboard_hub_create_pdevs(struct usb_device *parent_hub, struct list_head *pdev_list) > +{ > + int i; > + struct device_node *np, *npc; > + struct platform_device *pdev; > + struct pdev_list_entry *pdle; > + > + INIT_LIST_HEAD(pdev_list); > + > + for (i = 1; i <= parent_hub->maxchild; i++) { > + np = usb_of_get_device_node(parent_hub, i); > + if (!np) > + continue; > + > + if (!of_is_onboard_usb_hub(np)) > + goto node_put; > + > + npc = of_parse_phandle(np, "companion-hub", 0); > + if (!npc) > + goto create_pdev; > + > + pdev = of_find_device_by_node(npc); > + of_node_put(npc); > + > + if (pdev) { > + /* the companion hub already has a platform device, nothing to do here */ > + put_device(&pdev->dev); > + goto node_put; > + } > + > +create_pdev: I don't really like this "goto". I'd rather just use an "if" test for the few lines even if the indentation gets to be a bit much. -Doug