Re: [PATCH 1/2] gpio: tn48m: Add support for Delta TN4810M CPLD

[Robert Marko <robert.marko@sartura.hr>]

On Mon, Aug 2, 2021 at 2:12 PM Bartosz Golaszewski
<bgolaszewski@baylibre.com> wrote:
>
> On Mon, Aug 2, 2021 at 2:10 PM Bartosz Golaszewski
> <bgolaszewski@baylibre.com> wrote:
> >
> > On Sat, Jul 17, 2021 at 12:17 AM Robert Marko <robert.marko@sartura.hr> wrote:
> > >
> > > Delta TN4810M uses a similar CPLD GPIO expander
> > > like the TN48M, but it has pins for 48 SFP+ ports,
> > > making a total of 192 pins.
> > > It also provides the TX fault pins which the TN48M
> > > does not.
> > >
> > > Only TX disable pins like on the TN48M are output
> > > ones.
> > >
> > > Thankfully, regmap GPIO allows for the driver to be
> > > easily extended to support the TN4810M.
> > >
> > > Note that this patch depends on the following series:
> > > https://patchwork.ozlabs.org/project/linux-gpio/list/?series=247538
> > >
> > > Signed-off-by: Robert Marko <robert.marko@sartura.hr>
> > > ---
> > >  drivers/gpio/gpio-tn48m.c | 56 ++++++++++++++++++++++++++++++++++++---
> > >  1 file changed, 52 insertions(+), 4 deletions(-)
> > >
> > > diff --git a/drivers/gpio/gpio-tn48m.c b/drivers/gpio/gpio-tn48m.c
> > > index b12a6b4bc4b3..e429e7ade941 100644
> > > --- a/drivers/gpio/gpio-tn48m.c
> > > +++ b/drivers/gpio/gpio-tn48m.c
> > > @@ -19,6 +19,10 @@ enum tn48m_gpio_type {
> > >         TN48M_SFP_TX_DISABLE = 1,
> > >         TN48M_SFP_PRESENT,
> > >         TN48M_SFP_LOS,
> > > +       TN4810M_SFP_TX_DISABLE,
> > > +       TN4810M_SFP_TX_FAULT,
> > > +       TN4810M_SFP_PRESENT,
> > > +       TN4810M_SFP_LOS,
> > >  };
> > >
> > >  static int tn48m_gpio_probe(struct platform_device *pdev)
> > > @@ -46,17 +50,36 @@ static int tn48m_gpio_probe(struct platform_device *pdev)
> > >
> > >         config.regmap = regmap;
> > >         config.parent = &pdev->dev;
> > > -       config.ngpio = 4;
> > > +       config.ngpio_per_reg = 8;
> > >
> > >         switch (type) {
> > >         case TN48M_SFP_TX_DISABLE:
> > >                 config.reg_set_base = base;
> > > +               config.ngpio = 4;
> > >                 break;
> > >         case TN48M_SFP_PRESENT:
> > >                 config.reg_dat_base = base;
> > > +               config.ngpio = 4;
> > >                 break;
> > >         case TN48M_SFP_LOS:
> > >                 config.reg_dat_base = base;
> > > +               config.ngpio = 4;
> > > +               break;
> > > +       case TN4810M_SFP_TX_DISABLE:
> > > +               config.reg_set_base = base;
> > > +               config.ngpio = 48;
> > > +               break;
> > > +       case TN4810M_SFP_TX_FAULT:
> > > +               config.reg_dat_base = base;
> > > +               config.ngpio = 48;
> > > +               break;
> > > +       case TN4810M_SFP_PRESENT:
> > > +               config.reg_dat_base = base;
> > > +               config.ngpio = 48;
> > > +               break;
> > > +       case TN4810M_SFP_LOS:
> > > +               config.reg_dat_base = base;
> > > +               config.ngpio = 48;
> > >                 break;
> > >         default:
> > >                 dev_err(&pdev->dev, "unknown type %d\n", type);
> > > @@ -67,9 +90,34 @@ static int tn48m_gpio_probe(struct platform_device *pdev)
> > >  }
> > >
> > >  static const struct of_device_id tn48m_gpio_of_match[] = {
> > > -       { .compatible = "delta,tn48m-gpio-sfp-tx-disable", .data = (void *)TN48M_SFP_TX_DISABLE },
> > > -       { .compatible = "delta,tn48m-gpio-sfp-present", .data = (void *)TN48M_SFP_PRESENT },
> > > -       { .compatible = "delta,tn48m-gpio-sfp-los", .data = (void *)TN48M_SFP_LOS },
> > > +       {
> > > +               .compatible = "delta,tn48m-gpio-sfp-tx-disable",
> > > +               .data = (void *)TN48M_SFP_TX_DISABLE
> > > +       },
> > > +       {
> > > +               .compatible = "delta,tn48m-gpio-sfp-present",
> > > +               .data = (void *)TN48M_SFP_PRESENT
> > > +       },
> > > +       {
> > > +               .compatible = "delta,tn48m-gpio-sfp-los",
> > > +               .data = (void *)TN48M_SFP_LOS
> > > +       },
> > > +       {
> > > +               .compatible = "delta,tn4810m-gpio-sfp-tx-disable",
> > > +               .data = (void *)TN4810M_SFP_TX_DISABLE
> > > +       },
> > > +       {
> > > +               .compatible = "delta,tn4810m-gpio-sfp-tx-fault",
> > > +               .data = (void *)TN4810M_SFP_TX_FAULT
> > > +       },
> > > +       {
> > > +               .compatible = "delta,tn4810m-gpio-sfp-present",
> > > +               .data = (void *)TN4810M_SFP_PRESENT
> > > +       },
> > > +       {
> > > +               .compatible = "delta,tn4810m-gpio-sfp-los",
> > > +               .data = (void *)TN4810M_SFP_LOS
> > > +       },
> > >         { }
> > >  };
> > >  MODULE_DEVICE_TABLE(of, tn48m_gpio_of_match);
> > > --
> > > 2.31.1
> > >
> >
> > This looks good to me. I suppose the other patches are going in
> > through the MFD tree. I don't see anything that can fail here at
> > build-time - can you confirm that I can pick these patches up
> > separately for v5.15?
> >
> > Bartosz
>
> Scratch that, I now saw Linus' comment about the special purpose pins
> under the other series. Let's clear that up first.

Yeah,
I have finally replied to Linus,
hopefully, we can clear it up.

Thanks,
Robert
>
> Bart



-- 
Robert Marko
Staff Embedded Linux Engineer
Sartura Ltd.
Lendavska ulica 16a
10000 Zagreb, Croatia
Email: robert.marko@sartura.hr
Web: www.sartura.hr