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Mon, 19 May 2025 23:20:49 -0700 (PDT) X-Google-Smtp-Source: AGHT+IGTX8hp5weskPEE5GDjz/pk/LjB3S3wezIwyc7zvRNHdSFb9Vg1zsGhKvMWA085CsYcUQkZyA== X-Received: by 2002:a17:902:ce8f:b0:223:fdac:2e4 with SMTP id d9443c01a7336-231de3515a6mr193661335ad.1.1747722048622; Mon, 19 May 2025 23:20:48 -0700 (PDT) Received: from [10.92.166.0] ([202.46.23.19]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-231d4adafedsm69345285ad.56.2025.05.19.23.20.44 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 19 May 2025 23:20:48 -0700 (PDT) Message-ID: Date: Tue, 20 May 2025 11:50:43 +0530 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v1 2/2] usb: dwc3: eic7700: Add EIC7700 usb driver To: zhangsenchuan@eswincomputing.com Cc: ningyu@eswincomputing.com, robh@kernel.org, p.zabel@pengutronix.de, Thinh.Nguyen@synopsys.com, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, conor+dt@kernel.org, krzk+dt@kernel.org, linmin@eswincomputing.com, yangwei1@eswincomputing.com, gregkh@linuxfoundation.org References: <20250516095237.1516-1-zhangsenchuan@eswincomputing.com> <20250516095408.704-1-zhangsenchuan@eswincomputing.com> Content-Language: en-US From: Krishna Kurapati In-Reply-To: <20250516095408.704-1-zhangsenchuan@eswincomputing.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Proofpoint-ORIG-GUID: LWXrA4_PqjO8cLT1fBnc38jIicUFgZgV X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwNTIwMDA1MCBTYWx0ZWRfXz94ShNkURDKe Xyyz6o8tRuIcob7Lt1wNx8oFXbKCePprAn6mHJd7hT1mrOa93jxx+kP1srnSoZkm/4AAOZk2wuV dVRvVmsImVxp4w57D0EcxtYYeOqz4Ru6CoLevIWi4zcd2FMNNgGTr5c7T6PcyZr16shhsSuY2tM ZfrNPAC3eJvBw+M5JV8hUmIe4iqVfFbqWX3nZWPJ2vrMPtbd9cVqfspU6j/LHtoMCxo65+b/k02 BHB/qgMEHXISqRCh+RlQw9zrFsrSrR1gEbYWNx47hBcNW+nuvBRNh/fEBIsxOT2CLEqhQMfJJnT ciGGGe7D2UOmi7NtZ0NJ5AaaYgT8/EE+xLeHe54GojSI0USKe48TsFnH78yddYWoKbkNPIL4R7j cvMWUUqD+lY8iA1s0VS1BHBCTDid0LuDKkhX7M7qSAkDUnTBJ5W8Gtpm1OCYbFLUh0Nh3j5Y X-Authority-Analysis: v=2.4 cv=K4giHzWI c=1 sm=1 tr=0 ts=682c1f42 cx=c_pps a=IZJwPbhc+fLeJZngyXXI0A==:117 a=j4ogTh8yFefVWWEFDRgCtg==:17 a=IkcTkHD0fZMA:10 a=dt9VzEwgFbYA:10 a=h4SL0BZ7AAAA:8 a=2JH7PhIhr8-xlRfLaC8A:9 a=QEXdDO2ut3YA:10 a=uG9DUKGECoFWVXl0Dc02:22 a=Cfupvnr7wbb3QRzVG_cV:22 X-Proofpoint-GUID: LWXrA4_PqjO8cLT1fBnc38jIicUFgZgV X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1099,Hydra:6.0.736,FMLib:17.12.80.40 definitions=2025-05-20_03,2025-05-16_03,2025-03-28_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 spamscore=0 mlxlogscore=921 suspectscore=0 phishscore=0 clxscore=1015 malwarescore=0 lowpriorityscore=0 impostorscore=0 priorityscore=1501 mlxscore=0 adultscore=0 classifier=spam authscore=0 authtc=n/a authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2505070000 definitions=main-2505200050 On 5/16/2025 3:24 PM, zhangsenchuan@eswincomputing.com wrote: > From: Senchuan Zhang > > Add the eic7700 usb driver, which is responsible for > identifying,configuring and connecting usb devices,and > provides interfaces for accessing these devices. > > Co-developed-by: Wei Yang > Signed-off-by: Wei Yang > Signed-off-by: Senchuan Zhang > --- [...] > +static ssize_t dwc3_mode_show(struct device *device, > + struct device_attribute *attr, char *buf) > +{ > + struct dwc3_eswin *eswin = dev_get_drvdata(device); > + struct dwc3 *dwc = eswin->dwc; > + int ret; > + > + switch (dwc->current_dr_role) { > + case USB_DR_MODE_HOST: > + ret = sprintf(buf, "host\n"); > + break; > + case USB_DR_MODE_PERIPHERAL: > + ret = sprintf(buf, "peripheral\n"); > + break; > + case USB_DR_MODE_OTG: > + ret = sprintf(buf, "otg\n"); > + break; > + default: > + ret = sprintf(buf, "UNKNOWN\n"); > + } > + Use sysfs_emit instead [1]. > + return ret; > +} > + > +static ssize_t dwc3_mode_store(struct device *device, > + struct device_attribute *attr, const char *buf, > + size_t count) > +{ > + struct dwc3_eswin *eswin = dev_get_drvdata(device); > + struct dwc3 *dwc = eswin->dwc; > + enum usb_role new_role; > + struct usb_role_switch *role_sw = dwc->role_sw; > + > + if (!strncmp(buf, "1", 1) || !strncmp(buf, "host", 4)) { > + new_role = USB_ROLE_HOST; > + } else if (!strncmp(buf, "0", 1) || !strncmp(buf, "peripheral", 10)) { > + new_role = USB_ROLE_DEVICE; > + } else { > + dev_info(eswin->dev, "illegal dr_mode\n"); > + return count; > + } > + eswin->force_mode = true; > + > + mutex_lock(&eswin->lock); > + usb_role_switch_set_role(role_sw, new_role); > + mutex_unlock(&eswin->lock); > + > + return count; > +} > + > +static DEVICE_ATTR_RW(dwc3_mode); > + > +static ssize_t dwc3_hub_rst_show(struct device *device, > + struct device_attribute *attr, char *buf) > +{ > + struct dwc3_eswin *eswin = dev_get_drvdata(device); > + > + if (!IS_ERR(eswin->hub_gpio)) > + return sprintf(buf, "%d", gpiod_get_raw_value(eswin->hub_gpio)); > + > + return sprintf(buf, "UNKONWN"); Here too, Use sysfs_emit instead [1]. > +} > + > +static ssize_t dwc3_hub_rst_store(struct device *device, > + struct device_attribute *attr, > + const char *buf, size_t count) > +{ > + struct dwc3_eswin *eswin = dev_get_drvdata(device); > + > + if (!IS_ERR(eswin->hub_gpio)) { > + if (!strncmp(buf, "0", 1)) > + gpiod_set_raw_value(eswin->hub_gpio, 0); > + else > + gpiod_set_raw_value(eswin->hub_gpio, 1); > + } > + > + return count; > +} > + > +static DEVICE_ATTR_RW(dwc3_hub_rst); > + > +static struct attribute *dwc3_eswin_attrs[] = { > + &dev_attr_dwc3_mode.attr, > + &dev_attr_dwc3_hub_rst.attr, > + NULL, > +}; > + > +static struct attribute_group dwc3_eswin_attr_group = { > + .name = NULL, /* we want them in the same directory */ > + .attrs = dwc3_eswin_attrs, > +}; > + [...] > +static int dwc3_eswin_probe(struct platform_device *pdev) > +{ > + struct dwc3_eswin *eswin; > + struct device *dev = &pdev->dev; > + struct device_node *np = dev->of_node, *child; > + struct platform_device *child_pdev; > + unsigned int count; > + int ret; > + int i; > + int err_desc = 0; > + [...] > + child = of_get_child_by_name(np, "dwc3"); > + if (!child) { > + dev_err(dev, "failed to find dwc3 core node\n"); > + ret = -ENODEV; > + goto err1; > + } > + /* Allocate and initialize the core */ > + ret = of_platform_populate(np, NULL, NULL, dev); > + if (ret) { > + dev_err(dev, "failed to create dwc3 core\n"); > + goto err1; > + } > + > + INIT_WORK(&eswin->otg_work, dwc3_eswin_otg_extcon_evt_work); > + child_pdev = of_find_device_by_node(child); > + if (!child_pdev) { > + dev_err(dev, "failed to find dwc3 core device\n"); > + ret = -ENODEV; > + goto err2; > + } > + eswin->dwc = platform_get_drvdata(child_pdev); > + if (!eswin->dwc) { > + dev_err(dev, "failed to get drvdata dwc3\n"); > + ret = -EPROBE_DEFER; > + goto err2; > + } Try using falttened implementation if possible. Regards, Krishna,