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AJvYcCXsnay4pwJdkhcTcSnIqh1tLf1iFqX83GRvhuiIzoaRPssjKpQGgRkklrdRUvEHKbi9ob5iJMlLmkoMy+rY6bSYSKL0ABvTQdHjIA== X-Gm-Message-State: AOJu0YxtZZDgLKzioA5FdKa1PjDDiSPqF7p8bCeWHozqpd0554XDnfX0 47GDZ5aSHjI9uqTWVPO4navvW/EexWKQCjNAxED7wfyBuyL5l19BqvG8bm0g7+k= X-Google-Smtp-Source: AGHT+IE6TE7FkR861V4jgJweCw5NuGOOxA1KNRQlovILUZiSxktTVZnCjQFSUH4K2w9hASF75AGZ1w== X-Received: by 2002:aa7:c346:0:b0:561:2fd1:99e4 with SMTP id j6-20020aa7c346000000b005612fd199e4mr5161939edr.26.1708178331327; Sat, 17 Feb 2024 05:58:51 -0800 (PST) Received: from [192.168.0.22] ([78.10.207.130]) by smtp.gmail.com with ESMTPSA id ec11-20020a0564020d4b00b005643f110e66sm71005edb.16.2024.02.17.05.58.50 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sat, 17 Feb 2024 05:58:50 -0800 (PST) Message-ID: Date: Sat, 17 Feb 2024 14:58:50 +0100 Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 2/2] i3c: i3c-hub: Add Renesas RG3MxxB12A1 I3C HUB driver Content-Language: en-US To: Steven Niu , alexandre.belloni@bootlin.com, linux-i3c@lists.infradead.org, linux-kernel@vger.kernel.org, robh+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org, conor+dt@kernel.org, devicetree@vger.kernel.org Cc: zbigniew.lukwinski@linux.intel.com References: <20240217131412.4145506-1-steven.niu.uj@renesas.com> <20240217131412.4145506-2-steven.niu.uj@renesas.com> From: Krzysztof Kozlowski Autocrypt: addr=krzysztof.kozlowski@linaro.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 17/02/2024 14:14, Steven Niu wrote: > endif # I3C > diff --git a/drivers/i3c/Makefile b/drivers/i3c/Makefile > index 11982efbc6d9..ca298faaee9a 100644 > --- a/drivers/i3c/Makefile > +++ b/drivers/i3c/Makefile > @@ -2,3 +2,4 @@ > i3c-y := device.o master.o > obj-$(CONFIG_I3C) += i3c.o > obj-$(CONFIG_I3C) += master/ > +obj-$(CONFIG_I3C_HUB) += i3c-hub.o > diff --git a/drivers/i3c/i3c-hub.c b/drivers/i3c/i3c-hub.c > new file mode 100644 > index 000000000000..73a9b96e6635 > --- /dev/null > +++ b/drivers/i3c/i3c-hub.c > @@ -0,0 +1,1982 @@ > +// SPDX-License-Identifier: GPL-2.0 > +/* Copyright (C) 2021 - 2023 Intel Corporation.*/ So this explains the code... You push to us some vendor stuff with bindings not up to any upstream style. Please clean the bindings first so they look like other bindings. > + > +static int read_backend_from_i3c_hub_dts(struct device_node *i3c_node_target, > + struct i3c_hub *priv) > +{ > + struct device_node *i3c_node_tp; Your coding style is terrible. device_node are called np or node. > + const char *compatible; > + int tp_port, ret; > + u32 addr_dts; > + struct smbus_backend *backend; > + > + if (sscanf(i3c_node_target->full_name, "target-port@%d", &tp_port) == 0) > + return -EINVAL; > + > + if (tp_port > I3C_HUB_TP_MAX_COUNT) > + return -ERANGE; > + > + if (tp_port < 0) > + return -EINVAL; > + > + INIT_LIST_HEAD(&priv->logical_bus[tp_port].smbus_port_adapter.backend_entry); > + for_each_available_child_of_node(i3c_node_target, i3c_node_tp) { > + if (strcmp(i3c_node_tp->name, "backend")) No, don't compare names. What for? > + continue; > + > + ret = of_property_read_u32(i3c_node_tp, "target-reg", &addr_dts); > + if (ret) > + return ret; > + > + if (backend_node_is_exist(tp_port, priv, addr_dts)) > + continue; > + > + ret = of_property_read_string(i3c_node_tp, "compatible", &compatible); > + if (ret) > + return ret; > + > + /* Currently only the slave-mqueue backend is supported */ > + if (strcmp("slave-mqueue", compatible)) NAK, undocumented compatible. > + return -EINVAL; > + > + backend = kzalloc(sizeof(*backend), GFP_KERNEL); > + if (!backend) > + return -ENOMEM; > + > + backend->addr = addr_dts; > + backend->compatible = compatible; > + list_add(&backend->list, > + &priv->logical_bus[tp_port].smbus_port_adapter.backend_entry); > + } > + > + return 0; > +} > + > +/** > + * This function saves information about the i3c_hub's ports > + * working in slave mode. It takes its data from the DTs > + * (aspeed-bmc-intel-avc.dts) and saves the parameters > + * into the coresponding target port i2c_adapter_group structure > + * in the i3c_hub > + * > + * @dev: device used by i3c_hub > + * @i3c_node_hub: device node pointing to the hub > + * @priv: pointer to the i3c_hub structure > + */ > +static void i3c_hub_parse_dt_tp(struct device *dev, > + const struct device_node *i3c_node_hub, > + struct i3c_hub *priv) > +{ > + struct device_node *i3c_node_target; > + int ret; > + > + for_each_available_child_of_node(i3c_node_hub, i3c_node_target) { > + if (!strcmp(i3c_node_target->name, "target-port")) { > + ret = read_backend_from_i3c_hub_dts(i3c_node_target, priv); > + if (ret) > + dev_err(dev, "DTS entry invalid - error %d", ret); > + } > + } > +} > + > +static int i3c_hub_probe(struct i3c_device *i3cdev) > +{ > + struct regmap_config i3c_hub_regmap_config = { > + .reg_bits = 8, > + .val_bits = 8, > + }; > + struct device *dev = &i3cdev->dev; > + struct device_node *node = NULL; > + struct regmap *regmap; > + struct i3c_hub *priv; > + char hub_id[32]; > + int ret; > + int i; > + > + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); > + if (!priv) > + return -ENOMEM; > + > + priv->i3cdev = i3cdev; > + priv->driving_master = i3c_dev_get_master(i3cdev->desc); > + i3cdev_set_drvdata(i3cdev, priv); > + INIT_DELAYED_WORK(&priv->delayed_work, i3c_hub_delayed_work); > + sprintf(hub_id, "i3c-hub-%d-%llx", i3c_dev_get_master(i3cdev->desc)->bus.id, > + i3cdev->desc->info.pid); > + ret = i3c_hub_debugfs_init(priv, hub_id); > + if (ret) > + return dev_err_probe(dev, ret, "Failed to initialized DebugFS.\n"); Drop, you cannot fail probe on debugfs. > + > + i3c_hub_of_default_configuration(dev); > + > + regmap = devm_regmap_init_i3c(i3cdev, &i3c_hub_regmap_config); > + if (IS_ERR(regmap)) { > + ret = PTR_ERR(regmap); > + dev_err(dev, "Failed to register I3C HUB regmap\n"); > + goto error; > + } > + priv->regmap = regmap; > + > + ret = i3c_hub_read_id(dev); > + if (ret) > + goto error; > + > + priv->hub_dt_sel_id = -1; > + priv->hub_dt_cp1_id = -1; > + if (priv->hub_pin_cp1_id >= 0 && priv->hub_pin_sel_id >= 0) > + /* Find hub node in DT matching HW ID or just first without ID provided in DT */ > + node = i3c_hub_get_dt_hub_node(dev->parent->of_node, priv); > + > + if (!node) { > + dev_info(dev, "No DT entry - running with hardware defaults.\n"); > + } else { > + of_node_get(node); > + i3c_hub_of_get_conf_static(dev, node); > + i3c_hub_of_get_conf_runtime(dev, node); > + of_node_put(node); > + > + /* Parse DTS to find data on the SMBus target mode */ > + i3c_hub_parse_dt_tp(dev, node, priv); > + } > + > + /* Unlock access to protected registers */ > + ret = regmap_write(priv->regmap, I3C_HUB_PROTECTION_CODE, REGISTERS_UNLOCK_CODE); > + if (ret) { > + dev_err(dev, "Failed to unlock HUB's protected registers\n"); > + goto error; > + } > + > + /* Register logic for native smbus ports */ > + for (i = 0; i < I3C_HUB_TP_MAX_COUNT; i++) { > + priv->logical_bus[i].smbus_port_adapter.used = 0; > + if (priv->settings.tp[i].mode == I3C_HUB_DT_TP_MODE_SMBUS) > + ret = i3c_hub_smbus_tp_algo(priv, i); > + } > + > + ret = i3c_hub_configure_hw(dev); > + if (ret) { > + dev_err(dev, "Failed to configure the HUB\n"); > + goto error; > + } > + > + /* Lock access to protected registers */ > + ret = regmap_write(priv->regmap, I3C_HUB_PROTECTION_CODE, REGISTERS_LOCK_CODE); > + if (ret) { > + dev_err(dev, "Failed to lock HUB's protected registers\n"); > + goto error; > + } > + > + /* TBD: Apply special/security lock here using DEV_CMD register */ > + > + schedule_delayed_work(&priv->delayed_work, msecs_to_jiffies(100)); > + > + return 0; > + > +error: > + debugfs_remove_recursive(priv->debug_dir); > + return ret; > +} > + > +static void i3c_hub_remove(struct i3c_device *i3cdev) > +{ > + struct i3c_hub *priv = i3cdev_get_drvdata(i3cdev); > + struct i2c_adapter_group *g_adap; > + struct smbus_backend *backend = NULL; > + int i; > + > + for (i = 0; i < I3C_HUB_TP_MAX_COUNT; i++) { > + if (priv->logical_bus[i].smbus_port_adapter.used) { > + g_adap = &priv->logical_bus[i].smbus_port_adapter; > + cancel_delayed_work_sync(&g_adap->delayed_work_polling); > + list_for_each_entry(backend, &g_adap->backend_entry, list) { > + i2c_unregister_device(backend->client); > + kfree(backend); > + } > + } > + > + if (priv->logical_bus[i].smbus_port_adapter.used || > + priv->logical_bus[i].registered) > + i3c_master_unregister(&priv->logical_bus[i].controller); > + } > + > + cancel_delayed_work_sync(&priv->delayed_work); > + debugfs_remove_recursive(priv->debug_dir); > +} > + > +static struct i3c_driver i3c_hub = { > + .driver.name = "i3c-hub", > + .id_table = i3c_hub_ids, > + .probe = i3c_hub_probe, > + .remove = i3c_hub_remove, > +}; > + > +module_i3c_driver(i3c_hub); > + > +MODULE_AUTHOR("Zbigniew Lukwinski "); > +MODULE_AUTHOR("Steven Niu "); > +MODULE_DESCRIPTION("I3C HUB driver"); > +MODULE_LICENSE("GPL"); > diff --git a/drivers/i3c/master.c b/drivers/i3c/master.c > index 3afa530c5e32..b7cf15ba4e67 100644 > --- a/drivers/i3c/master.c > +++ b/drivers/i3c/master.c > @@ -2244,15 +2244,26 @@ static int of_populate_i3c_bus(struct i3c_master_controller *master) > struct device_node *node; > int ret; > u32 val; > + bool ignore_hub_node = false; > + char *addr_pid; > > if (!i3cbus_np) > return 0; > > for_each_available_child_of_node(i3cbus_np, node) { > - ret = of_i3c_master_add_dev(master, node); > - if (ret) { > - of_node_put(node); > - return ret; > + ignore_hub_node = false; > + if (node->full_name && strstr(node->full_name, "hub")) { NAK, you cannot rely on node name. Node name can be whatever, not "hub". Best regards, Krzysztof