linux-kernel - Re: [PATCH] iio: light: stk3310: add chip id for STK3311-X variant

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Date:   Sun, 05 Jul 2020 01:09:37 +0800
From:   Icenowy Zheng <icenowy@...c.io>
To:     Jonathan Cameron <jic23@...nel.org>,
        Ondrej Jirman <megous@...ous.com>
Cc:     linux-kernel@...r.kernel.org, Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        Luca Weiss <luca@...tu.xyz>,
        "open list:IIO SUBSYSTEM AND DRIVERS" <linux-iio@...r.kernel.org>
Subject: Re: [PATCH] iio: light: stk3310: add chip id for STK3311-X variant

在 2020-07-04星期六的 17:29 +0100，Jonathan Cameron写道：
> On Fri,  3 Jul 2020 21:44:05 +0200
> Ondrej Jirman <megous@...ous.com> wrote:
> 
> > From: Icenowy Zheng <icenowy@...c.io>
> > 
> > The STK3311 chip has a variant called STK3311-X, which has a
> > different
> > chip id of 0x12.
> > 
> > Add the chip id to the driver.
> > 
> > Signed-off-by: Icenowy Zheng <icenowy@...c.io>
> > Signed-off-by: Ondrej Jirman <megous@...ous.com>
> 
> Given this is clearly not quite compatible with the stk3311 probably
> best to also add a an id to the of id table.  Any idea what else
> is different?

By the way, STK3311 seems to have many variants lying around, and all
of them have different IDs. The pinouts seem to be different but the
registers are compatible.

[1] is a datasheet of STK3311-S34 with ID 0x1e.
[2] is a datasheet of STK3311-A with ID 0x15.

I cannot find the datasheet of STK3311-X, 0x12 is read from the device.
The model number itself is mentioned at [3], the official website of
sensortek.

[1] 
http://pro0fc108.hkpic1.websiteonline.cn/upload/STK3311-S34Datasheetv1.pdf

[2] 
http://pro0fc108.hkpic1.websiteonline.cn/upload/STK3311-ADatasheetv1.pdf

[3] 
http://www.sensortek.com.tw/index.php/en/products/proximity-sensor-with-als/

> 
> Thanks,
> 
> Jonathan
> 
> > ---
> >  drivers/iio/light/stk3310.c | 2 ++
> >  1 file changed, 2 insertions(+)
> > 
> > diff --git a/drivers/iio/light/stk3310.c
> > b/drivers/iio/light/stk3310.c
> > index 185c24a75ae6..1a8401d198a4 100644
> > --- a/drivers/iio/light/stk3310.c
> > +++ b/drivers/iio/light/stk3310.c
> > @@ -37,6 +37,7 @@
> >  
> >  #define STK3310_CHIP_ID_VAL			0x13
> >  #define STK3311_CHIP_ID_VAL			0x1D
> > +#define STK3311X_CHIP_ID_VAL			0x12
> >  #define STK3335_CHIP_ID_VAL			0x51
> >  #define STK3310_PSINT_EN			0x01
> >  #define STK3310_PS_MAX_VAL			0xFFFF
> > @@ -453,6 +454,7 @@ static int stk3310_init(struct iio_dev
> > *indio_dev)
> >  
> >  	if (chipid != STK3310_CHIP_ID_VAL &&
> >  	    chipid != STK3311_CHIP_ID_VAL &&
> > +	    chipid != STK3311X_CHIP_ID_VAL &&
> >  	    chipid != STK3335_CHIP_ID_VAL) {
> >  		dev_err(&client->dev, "invalid chip id: 0x%x\n",
> > chipid);
> >  		return -ENODEV;