linux-kernel - RE: [PATCH 3/3] pinctrl: imx: support SCMI pinctrl protocol for i.MX95

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Date: Mon, 27 May 2024 13:17:33 +0000
From: Peng Fan <peng.fan@....com>
To: Linus Walleij <linus.walleij@...aro.org>, "Peng Fan (OSS)"
	<peng.fan@....nxp.com>
CC: Sudeep Holla <sudeep.holla@....com>, Cristian Marussi
	<cristian.marussi@....com>, Rob Herring <robh@...nel.org>, Krzysztof
 Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, Shawn Guo
	<shawnguo@...nel.org>, Sascha Hauer <s.hauer@...gutronix.de>, Pengutronix
 Kernel Team <kernel@...gutronix.de>, Fabio Estevam <festevam@...il.com>,
	Aisheng Dong <aisheng.dong@....com>, Jacky Bai <ping.bai@....com>,
	"linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>, "devicetree@...r.kernel.org"
	<devicetree@...r.kernel.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "imx@...ts.linux.dev" <imx@...ts.linux.dev>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>
Subject: RE: [PATCH 3/3] pinctrl: imx: support SCMI pinctrl protocol for
 i.MX95

Hi Linus,

> Subject: Re: [PATCH 3/3] pinctrl: imx: support SCMI pinctrl protocol for
> i.MX95
> 
> On Tue, May 21, 2024 at 8:17 AM Peng Fan (OSS) <peng.fan@....nxp.com>
> wrote:
> 
> > +static int pinctrl_scmi_imx_dt_node_to_map(struct pinctrl_dev *pctldev,
> > +                                          struct device_node *np,
> > +                                          struct pinctrl_map **map,
> > +                                          unsigned int *num_maps)
> (...)
> > +static int pinctrl_scmi_imx_pinconf_set(struct pinctrl_dev *pctldev,
> > +                                       unsigned int pin,
> > +                                       unsigned long *configs,
> > +                                       unsigned int num_configs)
> 
> The code in these functions look suspiciously similar to same code in pinctrl-
> imx.c, I bet it is copy/pase/modify.

I only took the imx_pinctrl_parse_pin_mmio as example to get parse the node
and do the pinctrl_scmi_imx_dt_node_to_map here. Only the pieces:
"be32_to_cpu(*list++); "

For other parts, they are different. There is no MUX here, configs
has vendor SCMI "IMX_SCMI_PIN_X", and more.

> 
> Can you look a second time if it is possible to share code between the drivers?

I thought about this. Just trying what did for i.MX8 SCU pinctrl API by adding
IMX_USE_SCMI flag.

But because that means more if else check in pinctrl-imx.c and 
scmi requires different configs layout, which makes pinctrl-imx.c looks
messy. And scmi pinctrl requires a totally different probe function,
not imx_pinctrl_probe. So I decided to write a new driver for i.MX95.

> 
> It's not super much code, I'm mostly worried about bugs having to be fixed in
> two places.

I could switch back to my initial try to share pinctrl-imx.c, but I hope not.

> 
> What is the opinion of the othe i.MX pinctrl maintainers?

Aisheng,  Fabio, Shawn, Jacky, any comments?

Thanks,
Peng.

> 
> Yours,
> Linus Walleij