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Date:   Tue, 29 Oct 2019 10:58:59 -0700
From:   Tao Ren <rentao.bupt@gmail.com>
To:     Guenter Roeck <linux@roeck-us.net>
Cc:     Jean Delvare <jdelvare@suse.com>, Jonathan Corbet <corbet@lwn.net>,
        linux-hwmon@vger.kernel.org, linux-doc@vger.kernel.org,
        linux-kernel@vger.kernel.org, openbmc@lists.ozlabs.org,
        taoren@fb.com
Subject: Re: [PATCH 2/3] hwmon: (pmbus) add BEL PFE3000 power supply driver
Message-ID: <20191029175858.GB26890@taoren-ubuntu-R90MNF91>
References: <20191028234904.12441-1-rentao.bupt@gmail.com>
 <20191028234904.12441-3-rentao.bupt@gmail.com>
 <20191029125048.GA32552@roeck-us.net>
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On Tue, Oct 29, 2019 at 05:50:48AM -0700, Guenter Roeck wrote:
> On Mon, Oct 28, 2019 at 04:49:03PM -0700, rentao.bupt@gmail.com wrote:
> > From: Tao Ren <rentao.bupt@gmail.com>
> > 
> > Add the driver to support BEL PFE3000 which is 3000 Wat AC to DC power
> 
> which is a ...
> 
> Watt

My bad.. I just moved to a new machine and didn't notice import errors
printed by checkpatch.pl: it might be the reason why the error is not
detected by checkpach.pl.
Thanks for pointing it out, will fix it in v2.
 
> > supply. The chip has 8 pages.
> 
> FWIW, that is a bit misleading here. It isn't really 8 pages. I would suggest
> to drop that comment (or, if you insist, at least add "two of which are
> reserved").

I will remove the part in patch v2.

> > 
> > Signed-off-by: Tao Ren <rentao.bupt@gmail.com>
> > ---
> >  drivers/hwmon/pmbus/bel-pfe.c | 65 ++++++++++++++++++++++++++++++++++-
> >  1 file changed, 64 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/hwmon/pmbus/bel-pfe.c b/drivers/hwmon/pmbus/bel-pfe.c
> > index 117f9af21bf3..7b6c90b056c9 100644
> > --- a/drivers/hwmon/pmbus/bel-pfe.c
> > +++ b/drivers/hwmon/pmbus/bel-pfe.c
> > @@ -10,9 +10,21 @@
> >  #include <linux/init.h>
> >  #include <linux/err.h>
> >  #include <linux/i2c.h>
> > +#include <linux/pmbus.h>
> > +
> >  #include "pmbus.h"
> >  
> > -enum chips {pfe1100};
> > +enum chips {pfe1100, pfe3000};
> > +
> > +/*
> > + * Disable status check for pfe3000 devices, because some devices report
> > + * communication error (invalid command) for VOUT_MODE command (0x20)
> > + * although correct VOUT_MODE (0x16) is returned: it leads to incorrect
> > + * exponent in linear mode.
> > + */
> > +static struct pmbus_platform_data pfe3000_plat_data = {
> > +	.flags = PMBUS_SKIP_STATUS_CHECK,
> > +};
> >  
> >  static struct pmbus_driver_info pfe_driver_info[] = {
> >  	[pfe1100] = {
> > @@ -34,6 +46,45 @@ static struct pmbus_driver_info pfe_driver_info[] = {
> >  			   PMBUS_HAVE_STATUS_TEMP |
> >  			   PMBUS_HAVE_FAN12,
> >  	},
> > +
> > +	[pfe3000] = {
> > +		.pages = 8,
> > +		.format[PSC_VOLTAGE_IN] = linear,
> > +		.format[PSC_VOLTAGE_OUT] = linear,
> > +		.format[PSC_CURRENT_IN] = linear,
> > +		.format[PSC_CURRENT_OUT] = linear,
> > +		.format[PSC_POWER] = linear,
> > +		.format[PSC_TEMPERATURE] = linear,
> > +		.format[PSC_FAN] = linear,
> > +
> > +		/* Page 0: V1. */
> > +		.func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
> > +			   PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
> > +			   PMBUS_HAVE_POUT | PMBUS_HAVE_FAN12 |
> > +			   PMBUS_HAVE_VIN | PMBUS_HAVE_IIN |
> > +			   PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT |
> > +			   PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2 |
> > +			   PMBUS_HAVE_TEMP3 | PMBUS_HAVE_STATUS_TEMP |
> > +			   PMBUS_HAVE_VCAP,
> > +
> > +		/* Page 1: Vsb. */
> > +		.func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
> > +			   PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
> > +			   PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT |
> > +			   PMBUS_HAVE_POUT,
> > +
> > +		/*
> > +		 * Page 2: V1 Ishare.
> > +		 * Page 4: V1 Cathode.
> > +		 * Page 5: Vsb Cathode.
> > +		 * Page 6: V1 Sense.
> > +		 * Page 3 and 7 are reserved.
> 
> If page 7 is reserved, and doesn't have any attributes, it doesn't really
> make sense to claim support for 8 pages above. I would suugest to make it 7.

Will set total pages to 7 in patch v2.
 
> > +		 */
> > +		.func[2] = PMBUS_HAVE_VOUT,
> > +		.func[4] = PMBUS_HAVE_VOUT,
> > +		.func[5] = PMBUS_HAVE_VOUT,
> > +		.func[6] = PMBUS_HAVE_VOUT,
> > +	},
> >  };
> >  
> >  static int pfe_pmbus_probe(struct i2c_client *client,
> > @@ -42,11 +93,23 @@ static int pfe_pmbus_probe(struct i2c_client *client,
> >  	int model;
> >  
> >  	model = (int)id->driver_data;
> > +
> > +	/*
> > +	 * PFE3000-12-069RA devices may not stay in page 0 during device
> > +	 * probe which leads to probe failure (read status word failed).
> > +	 * So let's set the device to page 0 at the beginning.
> > +	 */
> > +	if (model == pfe3000) {
> > +		client->dev.platform_data = &pfe3000_plat_data;
> > +		i2c_smbus_write_byte_data(client, PMBUS_PAGE, 0);
> > +	}
> > +
> >  	return pmbus_do_probe(client, id, &pfe_driver_info[model]);
> >  }
> >  
> >  static const struct i2c_device_id pfe_device_id[] = {
> >  	{"pfe1100", pfe1100},
> > +	{"pfe3000", pfe3000},
> >  	{}
> >  };
> >