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([2600:1700:e321:62f0:da43:aeff:fecc:bfd5]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-22fc828b4d9sm16938695ad.191.2025.05.09.06.54.55 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 09 May 2025 06:54:56 -0700 (PDT) Sender: Guenter Roeck Message-ID: <45d1a08c-8a7f-4b6e-8068-4ab0e63abbf3@roeck-us.net> Date: Fri, 9 May 2025 06:54:55 -0700 Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 2/5] hwmon: pmbus: mpq8785: Add support for MPM82504 To: Pawel Dembicki , linux-hwmon@vger.kernel.org Cc: Jean Delvare , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Jonathan Corbet , Noah Wang , Fabio Estevam , Naresh Solanki , Michal Simek , Grant Peltier , Laurent Pinchart , Peter Zijlstra , Shen Lichuan , Greg KH , Charles Hsu , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org References: <20250509065237.2392692-1-paweldembicki@gmail.com> <20250509065237.2392692-3-paweldembicki@gmail.com> Content-Language: en-US From: Guenter Roeck Autocrypt: addr=linux@roeck-us.net; keydata= xsFNBE6H1WcBEACu6jIcw5kZ5dGeJ7E7B2uweQR/4FGxH10/H1O1+ApmcQ9i87XdZQiB9cpN RYHA7RCEK2dh6dDccykQk3bC90xXMPg+O3R+C/SkwcnUak1UZaeK/SwQbq/t0tkMzYDRxfJ7 nyFiKxUehbNF3r9qlJgPqONwX5vJy4/GvDHdddSCxV41P/ejsZ8PykxyJs98UWhF54tGRWFl 7i1xvaDB9lN5WTLRKSO7wICuLiSz5WZHXMkyF4d+/O5ll7yz/o/JxK5vO/sduYDIlFTvBZDh gzaEtNf5tQjsjG4io8E0Yq0ViobLkS2RTNZT8ICq/Jmvl0SpbHRvYwa2DhNsK0YjHFQBB0FX IdhdUEzNefcNcYvqigJpdICoP2e4yJSyflHFO4dr0OrdnGLe1Zi/8Xo/2+M1dSSEt196rXaC kwu2KgIgmkRBb3cp2vIBBIIowU8W3qC1+w+RdMUrZxKGWJ3juwcgveJlzMpMZNyM1jobSXZ0 VHGMNJ3MwXlrEFPXaYJgibcg6brM6wGfX/LBvc/haWw4yO24lT5eitm4UBdIy9pKkKmHHh7s jfZJkB5fWKVdoCv/omy6UyH6ykLOPFugl+hVL2Prf8xrXuZe1CMS7ID9Lc8FaL1ROIN/W8Vk BIsJMaWOhks//7d92Uf3EArDlDShwR2+D+AMon8NULuLBHiEUQARAQABzTJHdWVudGVyIFJv ZWNrIChMaW51eCBhY2NvdW50KSA8bGludXhAcm9lY2stdXMubmV0PsLBgQQTAQIAKwIbAwYL CQgHAwIGFQgCCQoLBBYCAwECHgECF4ACGQEFAlVcphcFCRmg06EACgkQyx8mb86fmYFg0RAA nzXJzuPkLJaOmSIzPAqqnutACchT/meCOgMEpS5oLf6xn5ySZkl23OxuhpMZTVX+49c9pvBx hpvl5bCWFu5qC1jC2eWRYU+aZZE4sxMaAGeWenQJsiG9lP8wkfCJP3ockNu0ZXXAXwIbY1O1 c+l11zQkZw89zNgWgKobKzrDMBFOYtAh0pAInZ9TSn7oA4Ctejouo5wUugmk8MrDtUVXmEA9 7f9fgKYSwl/H7dfKKsS1bDOpyJlqhEAH94BHJdK/b1tzwJCFAXFhMlmlbYEk8kWjcxQgDWMu GAthQzSuAyhqyZwFcOlMCNbAcTSQawSo3B9yM9mHJne5RrAbVz4TWLnEaX8gA5xK3uCNCeyI sqYuzA4OzcMwnnTASvzsGZoYHTFP3DQwf2nzxD6yBGCfwNGIYfS0i8YN8XcBgEcDFMWpOQhT Pu3HeztMnF3HXrc0t7e5rDW9zCh3k2PA6D2NV4fews9KDFhLlTfCVzf0PS1dRVVWM+4jVl6l HRIAgWp+2/f8dx5vPc4Ycp4IsZN0l1h9uT7qm1KTwz+sSl1zOqKD/BpfGNZfLRRxrXthvvY8 BltcuZ4+PGFTcRkMytUbMDFMF9Cjd2W9dXD35PEtvj8wnEyzIos8bbgtLrGTv/SYhmPpahJA l8hPhYvmAvpOmusUUyB30StsHIU2LLccUPPOwU0ETofVZwEQALlLbQeBDTDbwQYrj0gbx3bq 7kpKABxN2MqeuqGr02DpS9883d/t7ontxasXoEz2GTioevvRmllJlPQERVxM8gQoNg22twF7 pB/zsrIjxkE9heE4wYfN1AyzT+AxgYN6f8hVQ7Nrc9XgZZe+8IkuW/Nf64KzNJXnSH4u6nJM J2+Dt274YoFcXR1nG76Q259mKwzbCukKbd6piL+VsT/qBrLhZe9Ivbjq5WMdkQKnP7gYKCAi pNVJC4enWfivZsYupMd9qn7Uv/oCZDYoBTdMSBUblaLMwlcjnPpOYK5rfHvC4opxl+P/Vzyz 6WC2TLkPtKvYvXmdsI6rnEI4Uucg0Au/Ulg7aqqKhzGPIbVaL+U0Wk82nz6hz+WP2ggTrY1w ZlPlRt8WM9w6WfLf2j+PuGklj37m+KvaOEfLsF1v464dSpy1tQVHhhp8LFTxh/6RWkRIR2uF I4v3Xu/k5D0LhaZHpQ4C+xKsQxpTGuYh2tnRaRL14YMW1dlI3HfeB2gj7Yc8XdHh9vkpPyuT nY/ZsFbnvBtiw7GchKKri2gDhRb2QNNDyBnQn5mRFw7CyuFclAksOdV/sdpQnYlYcRQWOUGY HhQ5eqTRZjm9z+qQe/T0HQpmiPTqQcIaG/edgKVTUjITfA7AJMKLQHgp04Vylb+G6jocnQQX JqvvP09whbqrABEBAAHCwWUEGAECAA8CGwwFAlVcpi8FCRmg08MACgkQyx8mb86fmYHNRQ/+ J0OZsBYP4leJvQF8lx9zif+v4ZY/6C9tTcUv/KNAE5leyrD4IKbnV4PnbrVhjq861it/zRQW cFpWQszZyWRwNPWUUz7ejmm9lAwPbr8xWT4qMSA43VKQ7ZCeTQJ4TC8kjqtcbw41SjkjrcTG wF52zFO4bOWyovVAPncvV9eGA/vtnd3xEZXQiSt91kBSqK28yjxAqK/c3G6i7IX2rg6pzgqh hiH3/1qM2M/LSuqAv0Rwrt/k+pZXE+B4Ud42hwmMr0TfhNxG+X7YKvjKC+SjPjqp0CaztQ0H nsDLSLElVROxCd9m8CAUuHplgmR3seYCOrT4jriMFBtKNPtj2EE4DNV4s7k0Zy+6iRQ8G8ng QjsSqYJx8iAR8JRB7Gm2rQOMv8lSRdjva++GT0VLXtHULdlzg8VjDnFZ3lfz5PWEOeIMk7Rj trjv82EZtrhLuLjHRCaG50OOm0hwPSk1J64R8O3HjSLdertmw7eyAYOo4RuWJguYMg5DRnBk WkRwrSuCn7UG+qVWZeKEsFKFOkynOs3pVbcbq1pxbhk3TRWCGRU5JolI4ohy/7JV1TVbjiDI HP/aVnm6NC8of26P40Pg8EdAhajZnHHjA7FrJXsy3cyIGqvg9os4rNkUWmrCfLLsZDHD8FnU mDW4+i+XlNFUPUYMrIKi9joBhu18ssf5i5Q= In-Reply-To: <20250509065237.2392692-3-paweldembicki@gmail.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 5/8/25 23:51, Pawel Dembicki wrote: > Add support for the Monolithic Power Systems MPM82504 digital voltage > regulator. MPM82504 uses PMBus direct format for voltage output. > > Tested with device tree based matching. > > Signed-off-by: Pawel Dembicki > > --- > v2: > - fixed signedess for temperatures < 0 deg C > - remove empty lines > --- > Documentation/hwmon/mpq8785.rst | 20 +++++++++++++++----- > drivers/hwmon/pmbus/mpq8785.c | 30 +++++++++++++++++++++++++++++- > 2 files changed, 44 insertions(+), 6 deletions(-) > > diff --git a/Documentation/hwmon/mpq8785.rst b/Documentation/hwmon/mpq8785.rst > index bf8176b87086..be228ee58ce2 100644 > --- a/Documentation/hwmon/mpq8785.rst > +++ b/Documentation/hwmon/mpq8785.rst > @@ -6,6 +6,7 @@ Kernel driver mpq8785 > Supported chips: > > * MPS MPQ8785 > + * MPS MPM82504 > > Prefix: 'mpq8785' > > @@ -20,21 +21,30 @@ buck converter. The MPQ8785 offers a very compact solution that achieves up to > wide input supply range. The MPQ8785 operates at high efficiency over a wide > output current load range. > > +The MPM82504 is a quad 25A, scalable, fully integrated power module with a PMBus > +interface. The device offers a complete power solution that achieves up to 25A > +per output channel. The MPM82504 has four output channels that can be paralleled > +to provide 50A, 75A, or 100A of output current for flexible configurations. > +The device can also operate in parallel with the MPM3695-100 and additional > +MPM82504 devices to provide a higher output current. The MPM82504 operates > +at high efficiency across a wide load range. > + > The PMBus interface provides converter configurations and key parameters > monitoring. > > -The MPQ8785 adopts MPS's proprietary multi-phase digital constant-on-time (MCOT) > +The devices adopts MPS's proprietary multi-phase digital constant-on-time (MCOT) > control, which provides fast transient response and eases loop stabilization. > -The MCOT scheme also allows multiple MPQ8785 devices to be connected in parallel > -with excellent current sharing and phase interleaving for high-current > +The MCOT scheme also allows multiple devices or chennels to be connected in channels > +parallel with excellent current sharing and phase interleaving for high-current > applications. > > Fully integrated protection features include over-current protection (OCP), > over-voltage protection (OVP), under-voltage protection (UVP), and > over-temperature protection (OTP). > > -The MPQ8785 requires a minimal number of readily available, standard external > -components, and is available in a TLGA (5mmx6mm) package. > +All supported modules require a minimal number of readily available, standard > +external components. The MPQ8785 is available in a TLGA (5mmx6mm) package > +and the MPM82504 is available in a BGA (15mmx30mmx5.18mm) package. > > Device compliant with: > > diff --git a/drivers/hwmon/pmbus/mpq8785.c b/drivers/hwmon/pmbus/mpq8785.c > index 00ec21b081cb..9a4a211b2aeb 100644 > --- a/drivers/hwmon/pmbus/mpq8785.c > +++ b/drivers/hwmon/pmbus/mpq8785.c > @@ -8,7 +8,9 @@ > #include > #include "pmbus.h" > > -enum chips { mpq8785 }; > +#define PMBUS_READ_TEMPERATURE_1_SIGN BIT(9) s/PMBUS/MPM82504/ because this is not a standard bit. Needs to include linux/bits.h or better linux/bitops.h (see below). > + > +enum chips { mpq8785, mpm82504 }; Please keep those in alphabetic order. > > static int mpq8785_identify(struct i2c_client *client, > struct pmbus_driver_info *info) > @@ -36,6 +38,23 @@ static int mpq8785_identify(struct i2c_client *client, > return 0; > }; > > +static int mpm82504_read_word_data(struct i2c_client *client, int page, > + int phase, int reg) > +{ > + int ret; > + > + ret = pmbus_read_word_data(client, page, phase, reg); > + > + if (ret < 0 || reg != PMBUS_READ_TEMPERATURE_1) > + return ret; > + > + /* Fix PMBUS_READ_TEMPERATURE_1 signedness */ > + if (ret & PMBUS_READ_TEMPERATURE_1_SIGN) > + ret |= GENMASK(15, 10); Better use sign_extend32(ret, PMBUS_READ_TEMPERATURE_1_SIGN) & 0xffff. The mask is a bit odd but there is no sign_extend16(), but this makes it more obvious what is done here. Also, this needs to include linux/bitops.h. > + > + return ret; > +} > + > static struct pmbus_driver_info mpq8785_info = { > .pages = 1, > .format[PSC_VOLTAGE_IN] = direct, > @@ -59,12 +78,14 @@ static struct pmbus_driver_info mpq8785_info = { > > static const struct i2c_device_id mpq8785_id[] = { > { "mpq8785", mpq8785 }, > + { "mpm82504", mpm82504 }, > { }, > }; > MODULE_DEVICE_TABLE(i2c, mpq8785_id); > > static const struct of_device_id __maybe_unused mpq8785_of_match[] = { > { .compatible = "mps,mpq8785", .data = (void *)mpq8785 }, > + { .compatible = "mps,mpm82504", .data = (void *)mpm82504 }, Alphabetic order. > {} > }; > MODULE_DEVICE_TABLE(of, mpq8785_of_match); > @@ -88,6 +109,13 @@ static int mpq8785_probe(struct i2c_client *client) > case mpq8785: > info->identify = mpq8785_identify; > break; > + case mpm82504: > + info->format[PSC_VOLTAGE_OUT] = direct; > + info->m[PSC_VOLTAGE_OUT] = 8; > + info->b[PSC_VOLTAGE_OUT] = 0; > + info->R[PSC_VOLTAGE_OUT] = 2; > + info->read_word_data = mpm82504_read_word_data; > + break; Same here, with case statements. Sorry, I should have noticed in v1. Thanks, Guenter > default: > return -ENODEV; > }