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([2600:1700:e321:62f0:329c:23ff:fee3:9d7c]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-21177e7b7e0sm80998185ad.263.2024.11.11.15.31.40 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 11 Nov 2024 15:31:41 -0800 (PST) Message-ID: <7bdd2db8-41c8-43d8-ae73-84a221d2d004@roeck-us.net> Date: Mon, 11 Nov 2024 15:31:39 -0800 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 4/5] hwmon: tmp108: Add support for I3C device To: Frank Li Cc: Rob Herring , Krzysztof Kozlowski , Conor Dooley , Jonathan Cameron , Lars-Peter Clausen , Shawn Guo , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , Jean Delvare , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-iio@vger.kernel.org, imx@lists.linux.dev, linux-arm-kernel@lists.infradead.org, Krzysztof Kozlowski , linux-hwmon@vger.kernel.org References: <20241111-p3t1085-v3-0-bff511550aad@nxp.com> <20241111-p3t1085-v3-4-bff511550aad@nxp.com> <41995c8a-8b05-4c56-b4a3-5f275a88b899@roeck-us.net> Content-Language: en-US From: Guenter Roeck Autocrypt: addr=linux@roeck-us.net; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20241111_153142_917897_2B651E43 X-CRM114-Status: GOOD ( 19.77 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 11/11/24 15:20, Frank Li wrote: > On Mon, Nov 11, 2024 at 10:37:04AM -0800, Guenter Roeck wrote: >> On 11/11/24 10:10, Guenter Roeck wrote: >>> On 11/11/24 10:04, Guenter Roeck wrote: >>> [ ... ] >>>>> +static int p3t1085_i3c_probe(struct i3c_device *i3cdev) >>>>> +{ >>>>> +    struct device *dev = i3cdev_to_dev(i3cdev); >>>>> +    struct regmap *regmap; >>>>> + >>>>> +    regmap = devm_regmap_init_i3c(i3cdev, &tmp108_regmap_config); >>>>> +    if (IS_ERR(regmap)) >>>>> +        return dev_err_probe(dev, PTR_ERR(regmap), >>>>> +                     "Failed to register i3c regmap\n"); >>>>> + >>>>> +    return tmp108_common_probe(dev, regmap, "p3t1085_i3c"); >>>>> +} >>>>> + >>>>> +static struct i3c_driver p3t1085_driver = { >>>>> +    .driver = { >>>>> +        .name = "p3t1085_i3c", >>>>> +    }, >>>>> +    .probe = p3t1085_i3c_probe, >>>>> +    .id_table = p3t1085_i3c_ids, >>>>> +}; >>>>> +module_i3c_driver(p3t1085_driver); >>>>> +#endif >>>> >>>> While looking at i3c code, I found module_i3c_i2c_driver(). Can we use >>>> that function to register both i2c and i3c in one call ? >>>> >>> Answering my own question: No, because devm_regmap_init_i3c() >>> does not provide a dummy function if i3C is not enabled. >>> >> >> I do have another concern, though: What happens if the i2c part of the driver >> registers and the i3c part fails to register ? module_i3c_i2c_driver() handles >> that situation by unregistering the i2c driver, but I don't really know >> what happens if a single module registers two drivers and one of them fails. > > After use module_i3c_i2c_driver(), and remove #ifdef I3C, and disable I3C > in config, build passed. > > It possible cause by > > static inline int i3c_i2c_driver_register(struct i3c_driver *i3cdrv, > struct i2c_driver *i2cdrv) > { > int ret; > > ret = i2c_add_driver(i2cdrv); > if (ret || !IS_ENABLED(CONFIG_I3C)) > return ret; > > ^^^ !IS_ENABLED(CONFIG_I3C) is true, so linker skip below part. So no > ref to i3cdrv, so linker remove all related codes. > Yes, but I don't think we can rely on the compiler removing the call to devm_regmap_init_i3c(). Thanks, Guenter