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31 Aug 2024 22:57:53 +0200 Received: by mail.zeus03.de with ESMTPSA (TLS_AES_256_GCM_SHA384 encrypted, authenticated); 31 Aug 2024 22:57:53 +0200 X-UD-Smtp-Session: l3s3148p1@KE0j9gAh43xtKnBL Date: Sat, 31 Aug 2024 22:57:53 +0200 From: Wolfram Sang To: Farouk Bouabid Cc: Andi Shyti , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Quentin Schulz , Peter Rosin , Jean Delvare , Guenter Roeck , Heiko Stuebner , linux-i2c@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-hwmon@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-rockchip@lists.infradead.org Subject: Re: [PATCH v6 2/8] i2c: muxes: add support for tsd,mule-i2c multiplexer Message-ID: Mail-Followup-To: Wolfram Sang , Farouk Bouabid , Andi Shyti , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Quentin Schulz , Peter Rosin , Jean Delvare , Guenter Roeck , Heiko Stuebner , linux-i2c@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-hwmon@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-rockchip@lists.infradead.org References: <20240725-dev-mule-i2c-mux-v6-0-f9f6d7b60fb2@cherry.de> <20240725-dev-mule-i2c-mux-v6-2-f9f6d7b60fb2@cherry.de> MIME-Version: 1.0 In-Reply-To: <20240725-dev-mule-i2c-mux-v6-2-f9f6d7b60fb2@cherry.de> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240831_135801_679980_5DEEAA9C X-CRM114-Status: GOOD ( 19.82 ) X-BeenThere: linux-rockchip@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Upstream kernel work for Rockchip platforms List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: multipart/mixed; boundary="===============5675157472636425754==" Sender: "Linux-rockchip" Errors-To: linux-rockchip-bounces+linux-rockchip=archiver.kernel.org@lists.infradead.org --===============5675157472636425754== Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="dpR/Rm59Kxtb9gux" Content-Disposition: inline --dpR/Rm59Kxtb9gux Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Hi, On Thu, Jul 25, 2024 at 03:27:48PM +0200, Farouk Bouabid wrote: > Theobroma Systems Mule is an MCU that emulates a set of I2C devices, > among which an amc6821 and devices that are reachable through an I2C-mux. > The devices on the mux can be selected by writing the appropriate device > number to an I2C config register (amc6821 reg 0xff). >=20 > This driver is expected to be probed as a platform device with amc6821 > as its parent i2c device. >=20 > Add support for the mule-i2c-mux platform driver. The amc6821 driver > support for the mux will be added in a later commit. Seems like DT maintainers are happy with the approach. From the I2C perspective, this seems suitable as well. Just a few minor comments. Can be fixed incrementally, from my POV. But basically: Reviewed-by: Wolfram Sang > +static inline int __mux_select(struct regmap *regmap, u32 dev) > +{ > + return regmap_write(regmap, MUX_CONFIG_REG, dev); > +} Does this really need to be a seperate function? I'd vote for merging it into 'mux_select'. Also the __-prefix often means unlocked versions of some call, so it is also a bit misleading. > +static int mule_i2c_mux_probe(struct platform_device *pdev) > +{ > + struct device *mux_dev =3D &pdev->dev; > + struct mule_i2c_reg_mux *priv; > + struct i2c_client *client; > + struct i2c_mux_core *muxc; > + struct device_node *dev; > + unsigned int readback; > + int ndev, ret; > + bool old_fw; > + > + /* Count devices on the mux */ > + ndev =3D of_get_child_count(mux_dev->of_node); > + dev_dbg(mux_dev, "%d devices on the mux\n", ndev); > + > + client =3D to_i2c_client(mux_dev->parent); > + > + muxc =3D i2c_mux_alloc(client->adapter, mux_dev, ndev, sizeof(*priv), > + I2C_MUX_LOCKED, mux_select, mux_deselect); > + if (!muxc) > + return dev_err_probe(mux_dev, -ENOMEM, > + "Failed to allocate mux struct\n"); alloc_functions usually print something when failing. > + ret =3D i2c_mux_add_adapter(muxc, 0, reg); > + if (ret) > + return dev_err_probe(mux_dev, ret, > + "Failed to add i2c mux adapter %d\n", reg); The 'add_adapter' functions for sure print something when failing. Thanks! 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