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

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Date:   Tue, 12 Oct 2021 16:43:05 +0200
From:   Horatiu Vultur <horatiu.vultur@...rochip.com>
To:     Philipp Zabel <p.zabel@...gutronix.de>
CC:     <lars.povlsen@...rochip.com>, <Steen.Hegelund@...rochip.com>,
        <UNGLinuxDriver@...rochip.com>, <linus.walleij@...aro.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-gpio@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] pinctrl: microchip sgpio: use reset driver

Hi Philipp,

The 10/12/2021 15:40, Philipp Zabel wrote:
> 
> On Tue, 2021-10-12 at 14:24 +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 | 6 ++++++
> >  1 file changed, 6 insertions(+)
> >
> > diff --git a/drivers/pinctrl/pinctrl-microchip-sgpio.c b/drivers/pinctrl/pinctrl-microchip-sgpio.c
> > index 072bccdea2a5..e8a91d0824cb 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 +815,10 @@ static int microchip_sgpio_probe(struct platform_device *pdev)
> >
> >       priv->dev = dev;
> >
> > +     reset = devm_reset_control_get_shared(&pdev->dev, "switch");
> 
> This seems to be missing an update to the devicetree binding.

Yes, I will fix this in the next version.

> 
> Just to make sure we aren't introducing a circular dependency here, are
> the PHY reset GPIOs that are toggled by the "switch" reset controller in
> [1] provided by one of the sgpio controllers?
> 
> [1] https://lore.kernel.org/all/20211012114238.2060101-3-horatiu.vultur@microchip.com/

Nope, the GPIOs are provided by a differnet gpio controller.

> 
> regards
> Philipp

-- 
/Horatiu