linux-kernel - Re: [PATCH v6 2/2] pinctrl: microchip sgpio: use reset driver

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Message-ID: <14aa7bde4028007496dfbf041ab5000eb437941e.camel@pengutronix.de>
Date:   Mon, 18 Oct 2021 13:14:35 +0200
From:   Philipp Zabel <p.zabel@...gutronix.de>
To:     Horatiu Vultur <horatiu.vultur@...rochip.com>
Cc:     linus.walleij@...aro.org, robh+dt@...nel.org,
        lars.povlsen@...rochip.com, Steen.Hegelund@...rochip.com,
        UNGLinuxDriver@...rochip.com, linux-gpio@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 2/2] pinctrl: microchip sgpio: use reset driver

On Mon, 2021-10-18 at 13:12 +0200, Horatiu Vultur wrote:
> The 10/18/2021 12:37, Philipp Zabel wrote:
> 
> Hi Philipp,
> > Hi Horatiu,
> > 
> > On Mon, 2021-10-18 at 10:57 +0200, Horatiu Vultur wrote:
> > > On lan966x platform when the switch gets reseted then also the sgpio
> > > gets reseted. The fix for this is to extend also the sgpio driver to
> > > call the reset driver which will be reseted only once by the first
> > > driver that is probed.
> > > 
> > > Signed-off-by: Horatiu Vultur <horatiu.vultur@...rochip.com>
> > > ---
> > >  drivers/pinctrl/pinctrl-microchip-sgpio.c | 7 +++++++
> > >  1 file changed, 7 insertions(+)
> > > 
> > > diff --git a/drivers/pinctrl/pinctrl-microchip-sgpio.c b/drivers/pinctrl/pinctrl-microchip-sgpio.c
> > > index 072bccdea2a5..78765faa245a 100644
> > > --- a/drivers/pinctrl/pinctrl-microchip-sgpio.c
> > > +++ b/drivers/pinctrl/pinctrl-microchip-sgpio.c
> > > @@ -17,6 +17,7 @@
> > >  #include <linux/pinctrl/pinmux.h>
> > >  #include <linux/platform_device.h>
> > >  #include <linux/property.h>
> > > +#include <linux/reset.h>
> > > 
> > >  #include "core.h"
> > >  #include "pinconf.h"
> > > @@ -803,6 +804,7 @@ static int microchip_sgpio_probe(struct platform_device *pdev)
> > >       int div_clock = 0, ret, port, i, nbanks;
> > >       struct device *dev = &pdev->dev;
> > >       struct fwnode_handle *fwnode;
> > > +     struct reset_control *reset;
> > >       struct sgpio_priv *priv;
> > >       struct clk *clk;
> > >       u32 val;
> > > @@ -813,6 +815,11 @@ static int microchip_sgpio_probe(struct platform_device *pdev)
> > > 
> > >       priv->dev = dev;
> > > 
> > > +     reset = devm_reset_control_get_optional_shared(&pdev->dev, "switch");
> > 
> > This is the first GPIO driver that I am aware of that requests a named
> > reset control, so I'm still not sure if this should be called "switch"
> > instead of "gpio" or just "reset", just in case there is a future model
> > where the GPIO controller reset is not shared with the switch reset.
> 
> I agree, it is not the best name. But the name "switch" was already used
> in DT by sparx5[1], so I just went with this name.

Oh, ok, in that case the decision already has been made.

regards
Philipp