Am Fri, 12 Aug 2022 10:43:03 +0200
schrieb simon.guinot@xxxxxxxxxxxx:
> On Thu, Aug 11, 2022 at 05:39:05PM +0200, Henning Schild wrote:
> > Add GPIO support for Nuvoton NCT6116 chip. Nuvoton SuperIO chips are
> > very similar to the ones from Fintek. In other subsystems they also
> > share drivers and are called a family of drivers.
> >
> > For the GPIO subsystem the only difference is that the direction
> > bit is reversed and that there is only one data bit per pin. On the
> > SuperIO level the logical device is another one.
> >
> > Signed-off-by: Henning Schild <henning.schild@xxxxxxxxxxx>
> > ---
> > drivers/gpio/gpio-f7188x.c | 71
> > +++++++++++++++++++++++++++----------- 1 file changed, 51
> > insertions(+), 20 deletions(-)
> >
> > diff --git a/drivers/gpio/gpio-f7188x.c b/drivers/gpio/gpio-f7188x.c
> > index 18a3147f5a42..7b05ecc611e9 100644
> > --- a/drivers/gpio/gpio-f7188x.c
> > +++ b/drivers/gpio/gpio-f7188x.c
> > @@ -1,6 +1,7 @@
> > // SPDX-License-Identifier: GPL-2.0-or-later
> > /*
> > * GPIO driver for Fintek Super-I/O F71869, F71869A, F71882,
> > F71889 and F81866
> > + * and Nuvoton Super-I/O NCT6116D
> > *
> > * Copyright (C) 2010-2013 LaCie
> > *
> > @@ -22,13 +23,12 @@
> > #define SIO_LDSEL 0x07 /* Logical device
> > select */ #define SIO_DEVID 0x20 /* Device ID
> > (2 bytes) */ #define SIO_DEVREV 0x22 /*
> > Device revision */ -#define SIO_MANID 0x23 /*
> > Fintek ID (2 bytes) */
> > -#define SIO_LD_GPIO 0x06 /* GPIO logical
> > device */ #define SIO_UNLOCK_KEY 0x87 /* Key
> > to enable Super-I/O */ #define SIO_LOCK_KEY
> > 0xAA /* Key to disable Super-I/O */
> > -#define SIO_FINTEK_ID 0x1934 /* Manufacturer
> > ID */ +#define SIO_LD_GPIO_FINTEK 0x06 /* GPIO
> > logical device */ +#define SIO_LD_GPIO_NUVOTON 0x07
> > /* GPIO logical device */
>
> Please indulge me and add a new line here.
>
> > #define SIO_F71869_ID 0x0814 /* F71869
> > chipset ID */ #define SIO_F71869A_ID 0x1007
> > /* F71869A chipset ID */ #define SIO_F71882_ID
> > 0x0541 /* F71882 chipset ID */ @@ -37,7 +37,7 @@
> > #define SIO_F81866_ID 0x1010 /* F81866
> > chipset ID */ #define SIO_F81804_ID 0x1502 /*
> > F81804 chipset ID, same for f81966 */ #define SIO_F81865_ID
> > 0x0704 /* F81865 chipset ID */ -
> > +#define SIO_NCT6116D_ID 0xD283 /* NCT6116D chipset
> > ID */
>
> ... snip ...
>
> > @@ -485,12 +516,8 @@ static int __init f7188x_find(int addr, struct
> > f7188x_sio *sio) return err;
> >
> > err = -ENODEV;
> > - devid = superio_inw(addr, SIO_MANID);
> > - if (devid != SIO_FINTEK_ID) {
> > - pr_debug(DRVNAME ": Not a Fintek device at
> > 0x%08x\n", addr);
> > - goto err;
> > - }
>
> Sorry for missing that at my first review. You can't remove this block
> of code. This driver is poking around on the I2C bus, which is not
> great. So we want to make sure as much as possible that we are
> speaking to the right device.
Unfortunately the Nuvoton Super IOs do not have a global manufacturer
ID, just that chip ID in their global control registers.
So i think we should really just drop the checking of the manufacturer
ID all together, like proposed here. Or we could check manid+chipid for
fintek and only chipid for nuvoton (like i.e. all the wdt and hwmon
drivers for nuvoton do already).
In fact i will implement the best checking we can do, so match
manufacturer and chip where possible and drop to chip only where not.
Henning
> Simon
