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Sun, 28 Apr 2024 23:33:33 -0700 (PDT) Received: from [192.168.1.20] ([178.197.223.16]) by smtp.gmail.com with ESMTPSA id h8-20020aa7c948000000b0057204902580sm8677922edt.48.2024.04.28.23.33.32 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 28 Apr 2024 23:33:33 -0700 (PDT) Message-ID: Date: Mon, 29 Apr 2024 08:33:31 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 3/7] i2c: muxes: add support for mule i2c multiplexer To: Farouk Bouabid , Wolfram Sang , Peter Rosin , Andi Shyti , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Quentin Schulz , Heiko Stuebner Cc: linux-i2c@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-rockchip@lists.infradead.org References: <20240426-dev-mule-i2c-mux-v1-0-045a482f6ffb@theobroma-systems.com> <20240426-dev-mule-i2c-mux-v1-3-045a482f6ffb@theobroma-systems.com> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzysztof.kozlowski@linaro.org; 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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 26/04/2024 18:49, Farouk Bouabid wrote: > Mule is an mcu that emulates a set of i2c devices which are reacheable > through an i2c-mux. > > The emulated devices share a single i2c address with the mux itself where > the requested register is what determines which logic is executed (mux or > device): > > 1- The devices on the mux can be selected (mux function) by writing the > appropriate device number to an i2c config register (0xff) that is not > used by any device logic. > > 2- Any access to a register other than the config register will be > handled by the previously selected device. > > Signed-off-by: Farouk Bouabid > --- > drivers/i2c/muxes/Kconfig | 11 +++ > drivers/i2c/muxes/Makefile | 1 + > drivers/i2c/muxes/i2c-mux-mule.c | 157 +++++++++++++++++++++++++++++++++++++++ > 3 files changed, 169 insertions(+) > > diff --git a/drivers/i2c/muxes/Kconfig b/drivers/i2c/muxes/Kconfig > index db1b9057612a..593a20a6ac51 100644 > --- a/drivers/i2c/muxes/Kconfig > +++ b/drivers/i2c/muxes/Kconfig > @@ -119,4 +119,15 @@ config I2C_MUX_MLXCPLD > This driver can also be built as a module. If so, the module > will be called i2c-mux-mlxcpld. > > +config I2C_MUX_MULE > + tristate "Mule I2C device multiplexer" > + depends on OF > + help > + If you say yes to this option, support will be included for a > + Mule I2C device multiplexer. This driver provides access to > + I2C devices connected on the Mule I2C mux. Describe what is Mule. Here and in bindings documentation. > + > + This driver can also be built as a module. If so, the module > + will be called i2c-mux-mule. > + > endmenu > diff --git a/drivers/i2c/muxes/Makefile b/drivers/i2c/muxes/Makefile > index 6d9d865e8518..4b24f49515a7 100644 > --- a/drivers/i2c/muxes/Makefile > +++ b/drivers/i2c/muxes/Makefile > @@ -10,6 +10,7 @@ obj-$(CONFIG_I2C_MUX_GPIO) += i2c-mux-gpio.o > obj-$(CONFIG_I2C_MUX_GPMUX) += i2c-mux-gpmux.o > obj-$(CONFIG_I2C_MUX_LTC4306) += i2c-mux-ltc4306.o > obj-$(CONFIG_I2C_MUX_MLXCPLD) += i2c-mux-mlxcpld.o > +obj-$(CONFIG_I2C_MUX_MULE) += i2c-mux-mule.o > obj-$(CONFIG_I2C_MUX_PCA9541) += i2c-mux-pca9541.o > obj-$(CONFIG_I2C_MUX_PCA954x) += i2c-mux-pca954x.o > obj-$(CONFIG_I2C_MUX_PINCTRL) += i2c-mux-pinctrl.o > diff --git a/drivers/i2c/muxes/i2c-mux-mule.c b/drivers/i2c/muxes/i2c-mux-mule.c > new file mode 100644 > index 000000000000..da2a9526522e > --- /dev/null > +++ b/drivers/i2c/muxes/i2c-mux-mule.c > @@ -0,0 +1,157 @@ > +// SPDX-License-Identifier: GPL-2.0 > +/* > + * Mule I2C device multiplexer > + * > + * Copyright (C) 2024 Theobroma Systems Design und Consulting GmbH > + */ > + > +#include > +#include > +#include > +#include > +#include > +#include > + > +#define MUX_CONFIG_REG 0xff > +#define MUX_DEFAULT_DEV 0x0 > + > +struct mule_i2c_reg_mux { > + struct regmap *regmap; > +}; > + > +static const struct regmap_config mule_regmap_config = { > + .reg_bits = 8, > + .val_bits = 8, > +}; > + > +static const struct of_device_id mule_i2c_mux_of_match[] = { > + {.compatible = "tsd,mule-i2c-mux",}, > + {}, > +}; > +MODULE_DEVICE_TABLE(of, mule_i2c_mux_of_match); This goes after or before probe. Don't introduce unusual coding style. > + ... > +static void mux_remove(void *data) > +{ > + struct i2c_mux_core *muxc = data; > + > + i2c_mux_del_adapters(muxc); > + > + mux_deselect(muxc, MUX_DEFAULT_DEV); > +} > + > +static int mule_i2c_mux_probe(struct i2c_client *client) > +{ > + struct i2c_adapter *adap = client->adapter; > + struct mule_i2c_reg_mux *priv; > + struct i2c_mux_core *muxc; > + struct device_node *dev; > + unsigned int readback; > + bool old_fw; > + int ndev, ret; > + > + /* Count devices on the mux */ > + ndev = of_get_child_count(client->dev.of_node); > + dev_dbg(&client->dev, "%u devices on the mux\n", ndev); > + > + muxc = i2c_mux_alloc(adap, &client->dev, > + ndev, sizeof(*priv), > + I2C_MUX_LOCKED, > + mux_select, mux_deselect); Very odd alignment. This is absolutely unreadable. Please properly align with opening (. > + if (!muxc) > + return -ENOMEM; > + > + muxc->share_addr_with_children = 1; > + priv = i2c_mux_priv(muxc); > + > + priv->regmap = devm_regmap_init_i2c(client, &mule_regmap_config); > + if (IS_ERR(priv->regmap)) > + return dev_err_probe(&client->dev, PTR_ERR(priv->regmap), > + "Failed to allocate i2c register map\n"); > + > + i2c_set_clientdata(client, muxc); > + > + /* > + * Mux 0 is guaranteed to exist on all old and new mule fw. > + * mule fw without mux support will accept write ops to the > + * config register, but readback returns 0xff (register not updated). > + */ > + ret = mux_select(muxc, 0); > + if (ret) > + return ret; > + > + ret = regmap_read(priv->regmap, MUX_CONFIG_REG, &readback); > + if (ret) > + return ret; > + > + old_fw = (readback == 0); > + > + ret = devm_add_action_or_reset(&client->dev, mux_remove, muxc); This is really odd. Why do you call remove callback as devm action? I have serious doubts this was really tested. > + if (ret) > + return ret; > + > + /* Create device adapters */ > + for_each_child_of_node(client->dev.of_node, dev) { > + u32 reg; > + > + ret = of_property_read_u32(dev, "reg", ®); > + if (ret) { > + dev_err(&client->dev, "No reg property found for %s: %d\n", > + of_node_full_name(dev), ret); Very odd alignment. Please properly align with opening (. > + return ret; > + } > + > + if (!old_fw && reg != 0) { > + dev_warn(&client->dev, > + "Mux %d not supported, please update Mule FW\n", reg); > + continue; > + } > + > + ret = mux_select(muxc, reg); > + if (ret) { > + dev_warn(&client->dev, > + "Mux %d not supported, please update Mule FW\n", reg); > + continue; > + } > + > + ret = i2c_mux_add_adapter(muxc, 0, reg, 0); > + if (ret) { > + dev_err(&client->dev, "Failed to add i2c mux adapter %d: %d\n", reg, ret); > + return ret; > + } > + } > + > + mux_deselect(muxc, MUX_DEFAULT_DEV); > + > + return 0; > +} > + > +static struct i2c_driver mule_i2c_mux_driver = { > + .driver = { > + .name = "mule-i2c-mux", > + .of_match_table = mule_i2c_mux_of_match, > + }, > + .probe = mule_i2c_mux_probe, > +}; > + Anyway, all this looks like i2c-mux-reg. Please provide rationale in commit msg WHY you need one more driver. Best regards, Krzysztof _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel