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[2620:137:e000::1:20]) by mx.google.com with ESMTP id a7-20020a654187000000b004051d974ce4si10342412pgq.458.2022.06.29.09.01.15; Wed, 29 Jun 2022 09:01:33 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com header.s=20210112 header.b=TEqaPH+b; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234225AbiF2Pwx (ORCPT + 99 others); Wed, 29 Jun 2022 11:52:53 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34012 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231848AbiF2Pww (ORCPT ); Wed, 29 Jun 2022 11:52:52 -0400 Received: from mail-io1-xd2e.google.com (mail-io1-xd2e.google.com [IPv6:2607:f8b0:4864:20::d2e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 008711FCF6; Wed, 29 Jun 2022 08:52:50 -0700 (PDT) Received: by mail-io1-xd2e.google.com with SMTP id z191so16398488iof.6; Wed, 29 Jun 2022 08:52:50 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc:content-transfer-encoding; bh=m3srbM8QGWrZhwGq/B370AsvjDk8BediS0HIOgFCe3E=; b=TEqaPH+b8J+kXTgX6LEBz8BN99Q66IkyfTj6NQf26Ir9KFKzJZQhZNNYMMGqRDSXRo 7G8RPAE3Ivq80Rkwp/+ZUB/616P7/Lyl6qshrI567HvQ9t6/P6X0G1jLWZWUOjIkoWSt cWz4d4UdzcRBwtU09wfItyTJ5bA1klYc7TJ6RafHaP3Yo88QQKuHk1zI/qe3q/vWt9au LlVlhUhn+6HuKRK3wVWiMaHNlFbychaZJGtyZvVICV8gpj2/STktb0MXl1ilulpiV/Zf ZL+ykSxuyluILTFp3WJD6ZM2Ux79vUgPcg9FYBVp7HCc9nzlsTEp25Ooc7reCsJUgvA9 j6vg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc:content-transfer-encoding; bh=m3srbM8QGWrZhwGq/B370AsvjDk8BediS0HIOgFCe3E=; b=s8Q/WrTy4eqEd8IQXefqdG41wyUCi3GwTfmdbhrbSobmP1tJa+iWD/3SYMOWDyYKOp w8iYQWO4FzfA9yaSI7VJkgbs3r60Hye5O5yaDBEZWCQqXDLHu7tqTvhAq5hFNST/D7LB cvG1vSbiLMngasYrt5AX5khoNFG07K5OuBXZELvb8fF07TBFsC2zP6IQqMeT3DvmyOqW 3n/3IvUysZvE76z9ogRd6uq1vU36ylHdYytywv77E4zm/GxhBLOj8DGP7yfY2gbCuCX7 kCz+jMnN7AzpFOopcUIpXY1/ryWyt8qror351X0QrrYMN/HVprhhpIs4Ree7bmXZHIHx QoLg== X-Gm-Message-State: AJIora87TtyL/O9LGmeqZCyfpwQc9YVz2Q6zhOZHtOowdtin0049ZqLG 4k1sY3f5aQ2UmT1OVq4wirNrMuInWJNJkiMjCf4= X-Received: by 2002:a05:6638:14c7:b0:33c:c6ff:4d74 with SMTP id l7-20020a05663814c700b0033cc6ff4d74mr2346897jak.254.1656517968775; Wed, 29 Jun 2022 08:52:48 -0700 (PDT) MIME-Version: 1.0 References: <20220623115631.22209-1-peterwu.pub@gmail.com> <20220623115631.22209-12-peterwu.pub@gmail.com> In-Reply-To: From: ChiaEn Wu Date: Wed, 29 Jun 2022 23:52:33 +0800 Message-ID: Subject: Re: [PATCH v3 11/14] power: supply: mt6370: Add Mediatek MT6370 charger driver To: Andy Shevchenko Cc: Lee Jones , Daniel Thompson , Jingoo Han , Pavel Machek , Rob Herring , Krzysztof Kozlowski , Matthias Brugger , Sebastian Reichel , Chunfeng Yun , Greg Kroah-Hartman , Jonathan Cameron , Lars-Peter Clausen , Liam Girdwood , Mark Brown , Guenter Roeck , "Krogerus, Heikki" , Helge Deller , ChiaEn Wu , Alice Chen , cy_huang , dri-devel , Linux LED Subsystem , devicetree , linux-arm Mailing List , "moderated list:ARM/Mediatek SoC support" , Linux Kernel Mailing List , Linux PM , USB , linux-iio , "open list:FRAMEBUFFER LAYER" , szuni chen Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_FROM, RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Andy, Sorry for the late reply, I have some questions to ask you below. Thanks! Andy Shevchenko =E6=96=BC 2022=E5=B9=B46=E6=9C= =8824=E6=97=A5 =E9=80=B1=E4=BA=94 =E5=87=8C=E6=99=A82:56=E5=AF=AB=E9=81=93= =EF=BC=9A > > On Thu, Jun 23, 2022 at 2:00 PM ChiaEn Wu wrote: > > > > From: ChiaEn Wu > > > > Add Mediatek MT6370 charger driver. > > ... > > > +config CHARGER_MT6370 > > + tristate "Mediatek MT6370 Charger Driver" > > + depends on MFD_MT6370 > > + depends on REGULATOR > > + select LINEAR_RANGES > > + help > > + Say Y here to enable MT6370 Charger Part. > > + The device supports High-Accuracy Voltage/Current Regulation, > > + Average Input Current Regulation, Battery Temperature Sensing= , > > + Over-Temperature Protection, DPDM Detection for BC1.2. > > Module name? > > ... > > > +#include > > This usually goes after linux/* > > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > > +#include > > > > +#include > > +#include > > +#include > > +#include > > +#include > > ... > > > +#define MT6370_MIVR_IBUS_TH 100000 /* 100 mA */ > > Instead of comment, add proper units. > > ... > > > + MT6370_USB_STAT_DCP, > > + MT6370_USB_STAT_CDP, > > + MT6370_USB_STAT_MAX, > > No comma for a terminator line. > > ... > > > +static inline u32 mt6370_chg_val_to_reg(const struct mt6370_chg_range = *range, > > + u32 val) > > +static inline u32 mt6370_chg_reg_to_val(const struct mt6370_chg_range = *range, > > + u8 reg) > > I'm wondering if you can use the > https://elixir.bootlin.com/linux/v5.19-rc3/source/include/linux/linear_ra= nge.h > APIs. Thanks for your helpful comments! I will refine it in the next patch! > > ... > > > + int ret =3D 0; > > This seems a redundant assignment, see below. > > > + rcfg->ena_gpiod =3D fwnode_gpiod_get_index(of_fwnode_handle(of)= , > > + "enable", 0, > > For index =3D=3D 0 don't use _index API. > > > + GPIOD_OUT_LOW | > > + GPIOD_FLAGS_BIT_NONEXC= LUSIVE, > > + rdesc->name); > > + if (IS_ERR(rcfg->ena_gpiod)) { > > + dev_err(priv->dev, "Failed to requeset OTG EN Pin\n"); > > request > > > + rcfg->ena_gpiod =3D NULL; > > So, use _optional and return any errors you got. These days, I tried to use various APIs in , and also try to use _optional APIs. But my OTG regulator node is a child node of the charger node, like below. ---------------------------------------------------------------------------= - // copy-paste from our mfd dt-binding example charger { compatible =3D "mediatek,mt6370-charger"; interrupts =3D <48>, <68>, <6>; interrupt-names =3D "attach_i", "uvp_d_evt", "mivr"; io-channels =3D <&mt6370_adc MT6370_CHAN_IBUS>; mt6370_otg_vbus: usb-otg-vbus-regulator { regulator-name =3D "mt6370-usb-otg-vbus"; regulator-min-microvolt =3D <4350000>; regulator-max-microvolt =3D <5800000>; regulator-min-microamp =3D <500000>; regulator-max-microamp =3D <3000000>; }; }; ---------------------------------------------------------------------------= - Hence, if I use _optional APIs, it will always get NULL. And, If I use 'gpiod_get_from_of_node' here, this API will only parse the 'enable' property, not 'enable-gpio' or 'enable-gpios', we need to add the '-gpio' suffix before we use this API. Only 'fwnode_gpiod_get_index' can match this case. Although fwnode parsing is not preferred, 'of_parse_cb' already can guarantee the callback will only be used by the regulator of_node parsing. > > > + } else { > > + val =3D MT6370_OPA_MODE_MASK | MT6370_OTG_PIN_EN_MASK; > > + ret =3D regmap_update_bits(priv->regmap, MT6370_REG_CHG= _CTRL1, > > + val, val); > > + if (ret) > > + dev_err(priv->dev, "Failed to set otg bits\n"); > > + } > > ... > > > + irq_num =3D platform_get_irq_byname(pdev, irq_name); > > > + > > Unwanted blank line. > > > + if (irq_num < 0) { > > > + dev_err(priv->dev, "Failed to get platform resource\n")= ; > > Isn't it printed by the call? > > > + } else { > > + if (en) > > + enable_irq(irq_num); > > + else > > + disable_irq_nosync(irq_num); > > + } > > ... > > > +toggle_cfo_exit: > > The useless label. > > > + return ret; > > +} > > ... > > > + ret =3D mt6370_chg_get_online(priv, val); > > + if (!val->intval) { > > No error check? I replace "mt6370_chg_get_online()" with "power_supply_get_property()" and add some error check. Could it meet your expectations?? > > > + val->intval =3D POWER_SUPPLY_STATUS_DISCHARGING; > > + return 0; > > + } > > ... > > > +static int mt6370_chg_set_online(struct mt6370_priv *priv, > > + const union power_supply_propval *val) > > +{ > > + int attach; > > + u32 pwr_rdy =3D !!val->intval; > > + > > + mutex_lock(&priv->attach_lock); > > + attach =3D atomic_read(&priv->attach); > > + if (pwr_rdy =3D=3D !!attach) { > > + dev_err(priv->dev, "pwr_rdy is same(%d)\n", pwr_rdy); > > + mutex_unlock(&priv->attach_lock); > > + return 0; > > + } > > + > > + atomic_set(&priv->attach, pwr_rdy); > > + mutex_unlock(&priv->attach_lock); > > + > > + if (!queue_work(priv->wq, &priv->bc12_work)) > > + dev_err(priv->dev, "bc12 work has already queued\n"); > > + > > + return 0; > > > + > > Unwanted blank line. > > > +} > > > +static int mt6370_chg_get_property(struct power_supply *psy, > > + enum power_supply_property psp, > > + union power_supply_propval *val) > > +{ > > + struct mt6370_priv *priv =3D power_supply_get_drvdata(psy); > > + int ret =3D 0; > > + > > + switch (psp) { > > + case POWER_SUPPLY_PROP_ONLINE: > > + ret =3D mt6370_chg_get_online(priv, val); > > + break; > > + case POWER_SUPPLY_PROP_STATUS: > > + ret =3D mt6370_chg_get_status(priv, val); > > + break; > > + case POWER_SUPPLY_PROP_CHARGE_TYPE: > > + ret =3D mt6370_chg_get_charge_type(priv, val); > > + break; > > + case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT: > > + ret =3D mt6370_chg_get_ichg(priv, val); > > + break; > > + case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX: > > + ret =3D mt6370_chg_get_max_ichg(priv, val); > > + break; > > + case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE: > > + ret =3D mt6370_chg_get_cv(priv, val); > > + break; > > + case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX: > > + ret =3D mt6370_chg_get_max_cv(priv, val); > > + break; > > + case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT: > > + ret =3D mt6370_chg_get_aicr(priv, val); > > + break; > > + case POWER_SUPPLY_PROP_INPUT_VOLTAGE_LIMIT: > > + ret =3D mt6370_chg_get_mivr(priv, val); > > + break; > > + case POWER_SUPPLY_PROP_PRECHARGE_CURRENT: > > + ret =3D mt6370_chg_get_iprechg(priv, val); > > + break; > > + case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT: > > + ret =3D mt6370_chg_get_ieoc(priv, val); > > + break; > > + case POWER_SUPPLY_PROP_TYPE: > > + val->intval =3D priv->psy_desc->type; > > + break; > > + case POWER_SUPPLY_PROP_USB_TYPE: > > + val->intval =3D priv->psy_usb_type; > > + break; > > + default: > > + ret =3D -EINVAL; > > + break; > > + } > > + > > + return ret; > > In all cases, return directly. > > > +} > > ... > > > + switch (psp) { > > + case POWER_SUPPLY_PROP_ONLINE: > > + ret =3D mt6370_chg_set_online(priv, val); > > + break; > > + case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT: > > + ret =3D mt6370_chg_set_ichg(priv, val); > > + break; > > + case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE: > > + ret =3D mt6370_chg_set_cv(priv, val); > > + break; > > + case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT: > > + ret =3D mt6370_chg_set_aicr(priv, val); > > + break; > > + case POWER_SUPPLY_PROP_INPUT_VOLTAGE_LIMIT: > > + ret =3D mt6370_chg_set_mivr(priv, val); > > + break; > > + case POWER_SUPPLY_PROP_PRECHARGE_CURRENT: > > + ret =3D mt6370_chg_set_iprechg(priv, val); > > + break; > > + case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT: > > + ret =3D mt6370_chg_set_ieoc(priv, val); > > + break; > > + default: > > + ret =3D -EINVAL; > > + } > > + return ret; > > As per above. > > ... > > > + for (i =3D 0; i < F_MAX; i++) { > > + priv->rmap_fields[i] =3D devm_regmap_field_alloc(priv->= dev, > > + priv->re= gmap, > > + fds[i].f= ield); > > + if (IS_ERR(priv->rmap_fields[i])) { > > + dev_err(priv->dev, > > + "Failed to allocate regmap field [%s]\n= ", > > + fds[i].name); > > + return PTR_ERR(priv->rmap_fields[i]); > > return dev_err_probe(); > > > + } > > + } > > ... > > > + mutex_init(&priv->attach_lock); > > + atomic_set(&priv->attach, 0); > > Why not atomic_init() ? > But yeah, usage of it and other locking mechanisms in this driver are > questionable. I will refine it in the next patch! > > ... > > > + /* ICHG/IEOC Workaroud, ICHG can not be set less than 900mA */ > > Workaround > > ... > > > + return IS_ERR(priv->rdev) ? PTR_ERR(priv->rdev) : 0; > > PTR_ERR_OR_ZERO() > > ... > > > + .of_node =3D priv->dev->of_node, > > dev_of_node() ? > > > + }; > > + > > + priv->psy_desc =3D &mt6370_chg_psy_desc; > > + priv->psy_desc->name =3D dev_name(priv->dev); > > + priv->psy =3D devm_power_supply_register(priv->dev, priv->psy_d= esc, &cfg); > > + > > + return IS_ERR(priv->psy) ? PTR_ERR(priv->psy) : 0; > > PTR_ERR_OR_ZERO() > > > +} > > ... > > > +static irqreturn_t mt6370_attach_i_handler(int irq, void *data) > > +{ > > + struct mt6370_priv *priv =3D data; > > + u32 otg_en; > > + int ret; > > + > > + /* Check in otg mode or not */ > > + ret =3D mt6370_chg_field_get(priv, F_BOOST_STAT, &otg_en); > > + if (ret < 0) { > > + dev_err(priv->dev, "failed to get otg state\n"); > > + return IRQ_HANDLED; > > Handled error? > > > + } > > + > > + if (otg_en) > > + return IRQ_HANDLED; > > > + mutex_lock(&priv->attach_lock); > > + atomic_set(&priv->attach, MT6370_ATTACH_STAT_ATTACH_BC12_DONE); > > + mutex_unlock(&priv->attach_lock); > > Mutex around atomic?! It's interesting... I will revise it in the next patch. > > > + if (!queue_work(priv->wq, &priv->bc12_work)) > > + dev_err(priv->dev, "bc12 work has already queued\n"); > > + > > + return IRQ_HANDLED; > > +} > > ... > > > + for (i =3D 0; i < ARRAY_SIZE(mt6370_chg_irqs); i++) { > > + ret =3D platform_get_irq_byname(to_platform_device(priv= ->dev), > > + mt6370_chg_irqs[i].name); > > + if (ret < 0) { > > + dev_err(priv->dev, "Failed to get irq %s\n", > > + mt6370_chg_irqs[i].name); > > Isn't the same printed by the above call? well... yes they are similar, I will remove one of them in the next patch. > > > + return ret; > > + } > > + > > + ret =3D devm_request_threaded_irq(priv->dev, ret, NULL, > > + mt6370_chg_irqs[i].hand= ler, > > + IRQF_TRIGGER_FALLING, > > + dev_name(priv->dev), > > + priv); > > + > > + if (ret < 0) { > > + dev_err(priv->dev, "Failed to request irq %s\n"= , > > + mt6370_chg_irqs[i].name); > > + return ret; > > return dev_err_probe(); > > > + } > > + } > > ... > > > +static int mt6370_chg_probe(struct platform_device *pdev) > > +{ > > > Use return dev_err_probe(...); pattern. > > > +probe_out: > > + destroy_workqueue(priv->wq); > > + mutex_destroy(&priv->attach_lock); > > I don't see clearly the initialization of these in the ->probe(). > Besides that, does destroy_workque() synchronize the actual queue(s)? > > Mixing devm_ and non-devm_ may lead to a wrong release order that's > why it is better to see allocating and destroying resources in one > function (they may be wrapped, but should be both of them, seems like > you have done it only for the first parts). OK, I will try to revise these in the next patch! > > > + return ret; > > +} > > ... > > > +static int mt6370_chg_remove(struct platform_device *pdev) > > +{ > > + struct mt6370_priv *priv =3D platform_get_drvdata(pdev); > > + > > + if (priv) { > > Can you describe when this condition can be false? well... I will remove it in the next patch, sorry for making this stupid mistake... > > > + mt6370_chg_enable_irq(priv, "mivr", false); > > + cancel_delayed_work_sync(&priv->mivr_dwork); > > + destroy_workqueue(priv->wq); > > + mutex_destroy(&priv->attach_lock); > > + } > > + > > + return 0; > > +} > > ... > > > +static struct platform_driver mt6370_chg_driver =3D { > > + .probe =3D mt6370_chg_probe, > > + .remove =3D mt6370_chg_remove, > > + .driver =3D { > > + .name =3D "mt6370-charger", > > + .of_match_table =3D of_match_ptr(mt6370_chg_of_match), > > No good use of of_match_ptr(), please drop it. > > > + }, > > +}; > > -- > With Best Regards, > Andy Shevchenko Thanks for your review! Best regards, ChiaEn Wu