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bh=A/5cntKj1Rboep0ErkxJsbgUnugu9yuS7FLop8xwtCk=; b=ohYTosu2Jvm00G1zb7DlGLC62fQ8URytK8tOsbzjIEdg0da25B6FSbOFHzG1bDWN6O TqqZV0Z6nnl0xq14rG6cgSY8TfAbixj0anut09vzD8L1k/q6s0dQ3bIWEWb4cqu+bVNg KlGd4TxxRYtcXGhS8O/EQfF+ZYqbL3qGDjhae5Z+Wh6v3i5tGNhT3azR/kyfHEDj3zhh MOcfp+GQyPWH5u+Nnz2fnY8BnQf3efYP7Qf/sHz9Ixi8oh9oD2PcmVvyiMs5apnGIsNf dK0q1/efuC4fhn2ez0Xf+5A7vqunMXhM+Fj6ucwCjjJPbWJOaOZMvQ8ECbBslBjexFTm nOqg== X-Gm-Message-State: ANhLgQ1z8X6RW9aUr39VGEjGDC+k83MWrPm5Y6UZ4U3IWQ8bQFfgy7SA H1VDdJKYkT7wl2/2VzNf00BOsr9N X-Google-Smtp-Source: ADFU+vszedluTj80RaKNLI5miVmMBmoXsYGao5SAoFEOHYhMM/xJQ5/V63A9rJE5zg/IahCQoV7QJw== X-Received: by 2002:a63:ff4e:: with SMTP id s14mr14214611pgk.269.1585594096792; Mon, 30 Mar 2020 11:48:16 -0700 (PDT) Received: from server.roeck-us.net ([2600:1700:e321:62f0:329c:23ff:fee3:9d7c]) by smtp.gmail.com with ESMTPSA id r70sm10787393pfr.116.2020.03.30.11.48.15 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 30 Mar 2020 11:48:15 -0700 (PDT) Subject: Re: Linux driver for IRPS5401 - status reg not found To: Robert Hancock , Michal Simek Cc: linux-hwmon@vger.kernel.org References: <44d8631a-618c-a061-d9ca-d8030dd8a420@roeck-us.net> <52d41b38-8af9-1496-65dc-c36179a9d286@sedsystems.ca> From: Guenter Roeck Autocrypt: addr=linux@roeck-us.net; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.4.1 MIME-Version: 1.0 In-Reply-To: <52d41b38-8af9-1496-65dc-c36179a9d286@sedsystems.ca> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Sender: linux-hwmon-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-hwmon@vger.kernel.org On 3/30/20 8:42 AM, Robert Hancock wrote: > On 2020-03-30 9:24 a.m., Guenter Roeck wrote: >> On 3/30/20 4:33 AM, Michal Simek wrote: >>> Hi Robert and Guenter, >>> >>> Xilinx boards are using IRPS5401 chips and I have tried to use your driver. >>> I have checked that u-boot can detect that devices and read it. >>> >>> ZynqMP> i2c probe >>> Valid chip addresses: 0C 13 14 20 43 44 74 >>> ZynqMP> i2c md 13 0 10 >>> 0000: 00 08 00 08 00 08 00 08 00 08 00 08 00 08 00 08    ................ >>> ZynqMP> i2c md 14 0 10 >>> 0000: 00 08 00 08 00 08 00 08 00 08 00 08 00 08 00 08    ................ >>> ZynqMP> i2c md 43 0 10 >>> 0000: 00 98 ff ff ff ff ff ff ff ff ff ff ff ff ff ff    ................ >>> ZynqMP> i2c md 44 0 10 >>> 0000: 00 8a ff ff ff ff ff ff ff ff ff ff ff ff ff ff    ................ >>> ZynqMP> >>> >>> Here is DT fragment which I use (it is under i2c mux) >>> >>> 185                         irps5401_43: irps5401@43 { >>> 186                                 compatible = "infineon,irps5401"; >>> 187                                 reg = <0x43>; /* pmbus / i2c 0x13 */ >> >> Does that mean the mux is at 0x13 ? > > These chips have two I2C addresses with two separate interfaces: the standard PMBus-compatible interface at an address between 0x40-0x4f, which the irps5401 driver supports, and another proprietary interface at an address between 0x10-0x1f. The specific addresses in those ranges is configured by the value of a resistor on one of the pins. > Ah, sorry, I didn't get that part earlier. Unfortunately, the datasheet doesn't seem to include a description of the proprietary interface registers/commands, or maybe I am missing it. The chip datasheet does talk a lot about various MTP registers. Part of that register set is Write_protect_section and Read_protect_section. Maybe the PMBus registers are all read protected ? Guenter