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Message-ID: <CACRpkdZ6=1U6cDdPr64aDFDizHfzzAPOeNKwQy5Z0nRpB=jLjw@mail.gmail.com>
Date: Tue, 14 Mar 2017 15:47:58 +0100
From: Linus Walleij <linus.walleij@...aro.org>
To: Mika Penttilä <mika.penttila@...tfour.com>,
ext Tony Lindgren <tony@...mide.com>,
Gary Bisson <gary.bisson@...ndarydevices.com>,
Stefan Agner <stefan@...er.ch>, Shawn Guo <shawnguo@...nel.org>
Cc: LKML <linux-kernel@...r.kernel.org>,
"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>
Subject: Re: [PATCH] fix pinctrl setup for i.IMX6
On Tue, Feb 28, 2017 at 7:00 AM, Mika Penttilä
<mika.penttila@...tfour.com> wrote:
> Recent pulls for mainline pre 4.11 introduced pinctrl setup changes and moved pinctrl-imx to
> use generic helpers.
>
> Net effect was that hog group could not be resolved. I made it work for myself
> with a two stage setup with create and start separated, and dt probe in between them.
>
>
> Signed-off-by: Mika Penttilä <mika.penttila@...tfour.com>
Sorry for including the whole mail body, some people may have missed the
mail. Notably the i.MX maintainers.
Your patch reminds me of the pinctrl_register() vs pinctrl_register_and_init()
introduced by Tony Lindgren, can you look into this in commit
950b0d91dc108f54bccca5a2f75bb46f2df63d29
"pinctrl: core: Fix regression caused by delayed work for hogs"?
Does switching pinctrl_register_and_init() back to pinctrl_register()
solve your problem?
Gary: have you seen any problem like this?
Yours,
Linus Walleij
> ---
>
> diff --git a/drivers/pinctrl/core.c b/drivers/pinctrl/core.c
> index d690465..33659c5a 100644
> --- a/drivers/pinctrl/core.c
> +++ b/drivers/pinctrl/core.c
> @@ -2237,6 +2237,47 @@ int devm_pinctrl_register_and_init(struct device *dev,
> }
> EXPORT_SYMBOL_GPL(devm_pinctrl_register_and_init);
>
> +int devm_pinctrl_register_and_init_nostart(struct device *dev,
> + struct pinctrl_desc *pctldesc,
> + void *driver_data,
> + struct pinctrl_dev **pctldev)
> +{
> + struct pinctrl_dev **ptr;
> + struct pinctrl_dev *p;
> +
> + ptr = devres_alloc(devm_pinctrl_dev_release, sizeof(*ptr), GFP_KERNEL);
> + if (!ptr)
> + return -ENOMEM;
> +
> + p = pinctrl_init_controller(pctldesc, dev, driver_data);
> + if (IS_ERR(p)) {
> + devres_free(ptr);
> + return PTR_ERR(p);
> + }
> +
> + *ptr = p;
> + devres_add(dev, ptr);
> + *pctldev = p;
> +
> + return 0;
> +}
> +EXPORT_SYMBOL_GPL(devm_pinctrl_register_and_init_nostart);
> +
> +int devm_pinctrl_start(struct device *dev,
> + struct pinctrl_dev *pctldev)
> +{
> + int error = 0;
> +
> + error = pinctrl_create_and_start(pctldev);
> + if (error) {
> + mutex_destroy(&pctldev->mutex);
> + return error;
> + }
> +
> + return error;
> +}
> +EXPORT_SYMBOL_GPL(devm_pinctrl_start);
> +
> /**
> * devm_pinctrl_unregister() - Resource managed version of pinctrl_unregister().
> * @dev: device for which which resource was allocated
> diff --git a/drivers/pinctrl/freescale/pinctrl-imx.c b/drivers/pinctrl/freescale/pinctrl-imx.c
> index a7ace9e..3644aed 100644
> --- a/drivers/pinctrl/freescale/pinctrl-imx.c
> +++ b/drivers/pinctrl/freescale/pinctrl-imx.c
> @@ -686,16 +686,6 @@ static int imx_pinctrl_probe_dt(struct platform_device *pdev,
> return 0;
> }
>
> -/*
> - * imx_free_resources() - free memory used by this driver
> - * @info: info driver instance
> - */
> -static void imx_free_resources(struct imx_pinctrl *ipctl)
> -{
> - if (ipctl->pctl)
> - pinctrl_unregister(ipctl->pctl);
> -}
> -
> int imx_pinctrl_probe(struct platform_device *pdev,
> struct imx_pinctrl_soc_info *info)
> {
> @@ -774,26 +764,30 @@ int imx_pinctrl_probe(struct platform_device *pdev,
> ipctl->info = info;
> ipctl->dev = info->dev;
> platform_set_drvdata(pdev, ipctl);
> - ret = devm_pinctrl_register_and_init(&pdev->dev,
> - imx_pinctrl_desc, ipctl,
> - &ipctl->pctl);
> +
> + ret = devm_pinctrl_register_and_init_nostart(&pdev->dev,
> + imx_pinctrl_desc, ipctl,
> + &ipctl->pctl);
> +
> if (ret) {
> dev_err(&pdev->dev, "could not register IMX pinctrl driver\n");
> - goto free;
> + return ret;
> }
>
> ret = imx_pinctrl_probe_dt(pdev, ipctl);
> if (ret) {
> dev_err(&pdev->dev, "fail to probe dt properties\n");
> - goto free;
> + return ret;
> + }
> +
> + ret = devm_pinctrl_start(&pdev->dev, ipctl->pctl);
> + if (ret) {
> + dev_err(&pdev->dev, "could not start IMX pinctrl driver\n");
> + return ret;
> }
>
> dev_info(&pdev->dev, "initialized IMX pinctrl driver\n");
>
> return 0;
>
> -free:
> - imx_free_resources(ipctl);
> -
> - return ret;
> }
> diff --git a/include/linux/pinctrl/pinctrl.h b/include/linux/pinctrl/pinctrl.h
> index 8ce2d87..e7020f0 100644
> --- a/include/linux/pinctrl/pinctrl.h
> +++ b/include/linux/pinctrl/pinctrl.h
> @@ -153,9 +153,17 @@ extern struct pinctrl_dev *pinctrl_register(struct pinctrl_desc *pctldesc,
> extern void pinctrl_unregister(struct pinctrl_dev *pctldev);
>
> extern int devm_pinctrl_register_and_init(struct device *dev,
> - struct pinctrl_desc *pctldesc,
> - void *driver_data,
> - struct pinctrl_dev **pctldev);
> + struct pinctrl_desc *pctldesc,
> + void *driver_data,
> + struct pinctrl_dev **pctldev);
> +
> +extern int devm_pinctrl_register_and_init_nostart(struct device *dev,
> + struct pinctrl_desc *pctldesc,
> + void *driver_data,
> + struct pinctrl_dev **pctldev);
> +
> +extern int devm_pinctrl_start(struct device *dev,
> + struct pinctrl_dev *pctldev);
>
> /* Please use devm_pinctrl_register_and_init() instead */
> extern struct pinctrl_dev *devm_pinctrl_register(struct device *dev,
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