netdev - Re: [PATCH 3/4] can: mcp251xfd: add gpio functionality

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Message-ID: <20240424-furry-thankful-spoonbill-f81aef-mkl@pengutronix.de>
Date: Wed, 24 Apr 2024 15:01:48 +0200
From: Marc Kleine-Budde <mkl@...gutronix.de>
To: Gregor Herburger <gregor.herburger@...tq-group.com>
Cc: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>, 
	Thomas Kopp <thomas.kopp@...rochip.com>, Vincent Mailhol <mailhol.vincent@...adoo.fr>, 
	"David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>, linux-can@...r.kernel.org, 
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org, devicetree@...r.kernel.org, 
	linux@...tq-group.com, alexander.stein@...tq-group.com
Subject: Re: [PATCH 3/4] can: mcp251xfd: add gpio functionality

On 24.04.2024 11:35:59, Marc Kleine-Budde wrote:
> On 17.04.2024 15:43:56, Gregor Herburger wrote:
> > The mcp251xfd devices allow two pins to be configured as gpio. Add this
> > functionality to driver.
> > 
> > Signed-off-by: Gregor Herburger <gregor.herburger@...tq-group.com>
> > ---
> >  drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c   | 138 ++++++++++++++++++++++-
> >  drivers/net/can/spi/mcp251xfd/mcp251xfd-regmap.c |  21 +++-
> >  drivers/net/can/spi/mcp251xfd/mcp251xfd.h        |   4 +
> >  3 files changed, 159 insertions(+), 4 deletions(-)
> > 
> > diff --git a/drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c b/drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c
> > index eb699288c076..5ba9fd0af4b6 100644
> > --- a/drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c
> > +++ b/drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c
> 
> [...]
> 
> > +static int mcp251fdx_gpio_setup(struct mcp251xfd_priv *priv)
> > +{
> > +	struct gpio_chip *gc = &priv->gc;
> > +
> > +	if (!device_property_present(&priv->spi->dev, "gpio-controller"))
> > +		return 0;
> > +
> > +	if (priv->rx_int)
> > +		return dev_err_probe(&priv->spi->dev, -EINVAL,
> > +				     "Can't configure gpio-controller with RX-INT!\n");
> 
> Can you enhance the DT binding to reflect this?

Another option would be to check if RX-INT is configured in the
mcp251xfd_gpio_request() callback and refuse to request GPIO1.

regards,
Marc

-- 
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