linux-kernel - RE: [PATCH v4 4/7] gpio: vf610: add i.MX8ULP of_device

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Message-ID: <DU0PR04MB941726FE372D56D5DA676F9188C2A@DU0PR04MB9417.eurprd04.prod.outlook.com>
Date:   Wed, 27 Sep 2023 08:59:52 +0000
From:   Peng Fan <peng.fan@....com>
To:     Marco Felsch <m.felsch@...gutronix.de>,
        "Peng Fan (OSS)" <peng.fan@....nxp.com>
CC:     Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Andy Shevchenko <andy@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Stefan Agner <stefan@...er.ch>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        dl-linux-imx <linux-imx@....com>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: RE: [PATCH v4 4/7] gpio: vf610: add i.MX8ULP of_device_id entry

> Subject: Re: [PATCH v4 4/7] gpio: vf610: add i.MX8ULP of_device_id entry
> 
> On 23-09-26, Peng Fan (OSS) wrote:
> > From: Peng Fan <peng.fan@....com>
> >
> > i.MX8ULP/93 GPIO supports similar feature as i.MX7ULP GPIO, but
> > i.MX8ULP is actually not hardware compatible with i.MX7ULP. i.MX8ULP
> > only has one register base, not two bases. i.MX8ULP and i.MX93
> > actually has two interrupts for each gpio controller, one for
> > Trustzone non-secure world, one for secure world.
> >
> > Although the Linux Kernel driver gpio-vf610.c could work with
> > fsl,imx7ulp-gpio compatible, it is based on some tricks did in device
> > tree with some offset added to base address.
> >
> > Add a new of_device_id entry for i.MX8ULP. But to make the driver
> > could also support old bindings, check the compatible string first,
> > before check the device data.
> >
> > Signed-off-by: Peng Fan <peng.fan@....com>
> > ---
> >  drivers/gpio/gpio-vf610.c | 40
> > ++++++++++++++++++++++++++++++++++------
> >  1 file changed, 34 insertions(+), 6 deletions(-)
> >
> > diff --git a/drivers/gpio/gpio-vf610.c b/drivers/gpio/gpio-vf610.c
> > index dbc7ba0ee72c..49867d5db642 100644
> > --- a/drivers/gpio/gpio-vf610.c
> > +++ b/drivers/gpio/gpio-vf610.c
> > @@ -25,6 +25,7 @@
> >  struct fsl_gpio_soc_data {
> >  	/* SoCs has a Port Data Direction Register (PDDR) */
> >  	bool have_paddr;
> > +	bool have_dual_base;
> >  };
> >
> >  struct vf610_gpio_port {
> > @@ -60,13 +61,22 @@ struct vf610_gpio_port {
> >  #define PORT_INT_EITHER_EDGE	0xb
> >  #define PORT_INT_LOGIC_ONE	0xc
> >
> > +#define IMX8ULP_GPIO_BASE_OFF	0x40
> > +#define IMX8ULP_BASE_OFF	0x80
> > +
> >  static const struct fsl_gpio_soc_data imx_data = {
> >  	.have_paddr = true,
> > +	.have_dual_base = true,
> > +};
> > +
> > +static const struct fsl_gpio_soc_data imx8ulp_data = {
> > +	.have_paddr = true,
> >  };
> >
> >  static const struct of_device_id vf610_gpio_dt_ids[] = {
> >  	{ .compatible = "fsl,vf610-gpio",	.data = NULL, },
> >  	{ .compatible = "fsl,imx7ulp-gpio",	.data = &imx_data, },
> > +	{ .compatible = "fsl,imx8ulp-gpio",	.data = &imx8ulp_data, },
> >  	{ /* sentinel */ }
> >  };
> >
> > @@ -263,19 +273,37 @@ static int vf610_gpio_probe(struct
> platform_device *pdev)
> >  	struct gpio_irq_chip *girq;
> >  	int i;
> >  	int ret;
> > +	bool dual_base = false;
> >
> >  	port = devm_kzalloc(dev, sizeof(*port), GFP_KERNEL);
> >  	if (!port)
> >  		return -ENOMEM;
> >
> >  	port->sdata = of_device_get_match_data(dev);
> > -	port->base = devm_platform_ioremap_resource(pdev, 0);
> > -	if (IS_ERR(port->base))
> > -		return PTR_ERR(port->base);
> >
> > -	port->gpio_base = devm_platform_ioremap_resource(pdev, 1);
> > -	if (IS_ERR(port->gpio_base))
> > -		return PTR_ERR(port->gpio_base);
> > +	/* support old compatible strings */
> > +	if (device_is_compatible(dev, "fsl,imx7ulp-gpio") &&
> > +	    (device_is_compatible(dev, "fsl,imx93-gpio") ||
> > +	    (device_is_compatible(dev, "fsl,imx8ulp-gpio"))))
> > +		dual_base = true;
> 
> Could be simplified even further, if we would add the have_dual_base for the
> vf610 as well within this patch.

ok, need move part of patch 5 into patch 4, Then patch 5 just drop the
port->sdata check.

Will wait a few days before post V5 in case people has comments on
other parts.

Thanks,
Peng.

> 
> 	dual_base = port->sdata->have_dual_base;
> 
> 	/* support old bindings */
> 	if (device_is_compatible(dev, "fsl,imx7ulp-gpio") &&
> 	    (device_is_compatible(dev, "fsl,imx93-gpio") ||
> 	    (device_is_compatible(dev, "fsl,imx8ulp-gpio"))))
> 		dual_base = true;
> 
> 	if (dual_base) {
> 		...
> 
> Regards,
>   Marco
> 
> > +	if ((port->sdata && port->sdata->have_dual_base) || dual_base) {
> > +		port->base = devm_platform_ioremap_resource(pdev, 0);
> > +		if (IS_ERR(port->base))
> > +			return PTR_ERR(port->base);
> > +
> > +		port->gpio_base = devm_platform_ioremap_resource(pdev,
> 1);
> > +		if (IS_ERR(port->gpio_base))
> > +			return PTR_ERR(port->gpio_base);
> > +	} else {
> > +		port->base = devm_platform_ioremap_resource(pdev, 0);
> > +		if (IS_ERR(port->base))
> > +			return PTR_ERR(port->base);
> > +
> > +		port->gpio_base = port->base + IMX8ULP_GPIO_BASE_OFF;
> > +		port->base = port->base + IMX8ULP_BASE_OFF;
> > +	}
> > +
> >
> >  	port->irq = platform_get_irq(pdev, 0);
> >  	if (port->irq < 0)
> >
> > --
> > 2.37.1
> >
> >