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[99.44.17.11]) by smtp.gmail.com with ESMTPSA id d199sm95891pfd.187.2021.04.29.16.39.39 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 29 Apr 2021 16:39:45 -0700 (PDT) Subject: Re: [PATCH net-next 2/4] net: dsa: mt7530: add interrupt support To: DENG Qingfang , "David S. Miller" , Andrew Lunn , Heiner Kallweit , Jakub Kicinski , Landen Chao , Matthias Brugger , Russell King , Sean Wang , Vivien Didelot , Vladimir Oltean , Rob Herring , Linus Walleij , Greg Kroah-Hartman , Sergio Paracuellos , linux-kernel@vger.kernel.org, linux-mediatek@lists.infradead.org, linux-staging@lists.linux.dev, devicetree@vger.kernel.org, netdev@vger.kernel.org Cc: Weijie Gao , Chuanhong Guo , =?UTF-8?Q?Ren=c3=a9_van_Dorst?= , Frank Wunderlich , Thomas Gleixner , Marc Zyngier References: <20210429062130.29403-1-dqfext@gmail.com> <20210429062130.29403-3-dqfext@gmail.com> From: Florian Fainelli Message-ID: <18aa9a3b-e286-86b2-8b9b-e519ad884d77@gmail.com> Date: Thu, 29 Apr 2021 16:39:36 -0700 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Firefox/78.0 Thunderbird/78.10.0 MIME-Version: 1.0 In-Reply-To: <20210429062130.29403-3-dqfext@gmail.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 4/28/2021 11:21 PM, DENG Qingfang wrote: > Add support for MT7530 interrupt controller to handle internal PHYs. > In order to assign an IRQ number to each PHY, the registration of MDIO bus > is also done in this driver. > > Signed-off-by: DENG Qingfang > --- [snip] > +static int > +mt7530_setup_irq(struct mt7530_priv *priv) > +{ > + struct device *dev = priv->dev; > + struct device_node *np = dev->of_node; > + int ret; > + > + if (!of_property_read_bool(np, "interrupt-controller")) { > + dev_info(dev, "no interrupt support\n"); > + return 0; > + } > + > + priv->irq = of_irq_get(np, 0); Using platform_get_irq() may be a bit nicer to avoid using too many OF-centric APIs, but this does not have to be changed right now. Likewise for the interrupt-controller above. > + if (priv->irq <= 0) { > + dev_err(dev, "failed to get parent IRQ: %d\n", priv->irq); > + return priv->irq ? : -EINVAL; > + } > + > + priv->irq_domain = irq_domain_add_linear(np, MT7530_NUM_PHYS, > + &mt7530_irq_domain_ops, priv); > + if (!priv->irq_domain) { > + dev_err(dev, "failed to create IRQ domain\n"); > + return -ENOMEM; > + } > + > + /* This register must be set for MT7530 to properly fire interrupts */ > + if (priv->id != ID_MT7531) > + mt7530_set(priv, MT7530_TOP_SIG_CTRL, TOP_SIG_CTRL_NORMAL); > + > + ret = request_threaded_irq(priv->irq, NULL, mt7530_irq_thread_fn, > + IRQF_ONESHOT, KBUILD_MODNAME, priv); Maybe dev_name() would be more unique in case a system happens to have more switches in the future so you can easily differentiate them. > + if (ret) { Can you call mt7530_free_irq() to avoid the error repetition? > + irq_domain_remove(priv->irq_domain); > + dev_err(dev, "failed to request IRQ: %d\n", ret); > + return ret; > + } > + > + return 0; > +} > + > +static void > +mt7530_free_mdio_irq(struct mt7530_priv *priv) > +{ > + int p; > + > + for (p = 0; p < MT7530_NUM_PHYS; p++) { > + if (BIT(p) & priv->ds->phys_mii_mask) { > + unsigned int irq; > + > + irq = irq_find_mapping(priv->irq_domain, p); > + irq_dispose_mapping(irq); > + } > + } > +} > + > +static void > +mt7530_free_irq_common(struct mt7530_priv *priv) > +{ > + free_irq(priv->irq, priv); > + irq_domain_remove(priv->irq_domain); > +} > + > +static void > +mt7530_free_irq(struct mt7530_priv *priv) > +{ > + mt7530_free_mdio_irq(priv); > + mt7530_free_irq_common(priv); > +} > + > +static int > +mt7530_setup_mdio(struct mt7530_priv *priv) > +{ > + struct dsa_switch *ds = priv->ds; > + struct device *dev = priv->dev; > + struct mii_bus *bus; > + static int idx; > + int ret; > + > + bus = devm_mdiobus_alloc(dev); > + if (!bus) > + return -ENOMEM; > + > + ds->slave_mii_bus = bus; > + bus->priv = priv; > + bus->name = KBUILD_MODNAME "-mii"; > + snprintf(bus->id, MII_BUS_ID_SIZE, KBUILD_MODNAME "-%d", idx++); Likewise using dev_name() here would provide an unique name in case you have multiple switches. Feel free to address my comments later, they do not seem to be blocking: Reviewed-by: Florian Fainelli -- Florian