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Message-ID: <c00f8fe3-d12a-0f91-c301-c028e5aa3f25@nxp.com>
Date: Thu, 16 Jul 2020 18:14:22 +0300
From: Daniel Baluta <daniel.baluta@....com>
To: Anson Huang <Anson.Huang@....com>, aisheng.dong@....com,
festevam@...il.com, shawnguo@...nel.org, stefan@...er.ch,
kernel@...gutronix.de, linus.walleij@...aro.org,
s.hauer@...gutronix.de, linux-gpio@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Cc: Linux-imx@....com
Subject: Re: [PATCH 1/2] pinctrl: imx: Support building SCU pinctrl driver as
module
Hi Anson,
Few comments inline:
On 7/16/20 6:06 PM, Anson Huang wrote:
> To support building i.MX SCU pinctrl driver as module, below things need to be changed:
>
> - Export SCU related functions and use "IS_ENABLED" instead of
> "ifdef" to support SCU pinctrl driver user and itself to be
> built as module;
> - Use function callbacks for SCU related functions in pinctrl-imx.c
> in order to support the scenario of PINCTRL_IMX is built in
> while PINCTRL_IMX_SCU is built as module;
> - All drivers using SCU pinctrl driver need to initialize the
> SCU related function callback;
> - Change PINCTR_IMX_SCU to tristate;
> - Add module author, description and license.
>
> With above changes, i.MX SCU pinctrl driver can be built as module.
There are a lot of changes here. I think it would be better to try to
split them
per functionality. One functional change per patch.
>
> Signed-off-by: Anson Huang <Anson.Huang@....com>
> ---
> drivers/pinctrl/freescale/Kconfig | 2 +-
> drivers/pinctrl/freescale/pinctrl-imx.c | 8 ++--
> drivers/pinctrl/freescale/pinctrl-imx.h | 57 ++++++++++++-----------------
> drivers/pinctrl/freescale/pinctrl-imx8dxl.c | 3 ++
> drivers/pinctrl/freescale/pinctrl-imx8qm.c | 3 ++
> drivers/pinctrl/freescale/pinctrl-imx8qxp.c | 3 ++
> drivers/pinctrl/freescale/pinctrl-scu.c | 5 +++
> 7 files changed, 42 insertions(+), 39 deletions(-)
>
> diff --git a/drivers/pinctrl/freescale/Kconfig b/drivers/pinctrl/freescale/Kconfig
> index 08fcf5c..570355c 100644
> --- a/drivers/pinctrl/freescale/Kconfig
> +++ b/drivers/pinctrl/freescale/Kconfig
> @@ -7,7 +7,7 @@ config PINCTRL_IMX
> select REGMAP
>
> config PINCTRL_IMX_SCU
> - bool
> + tristate "IMX SCU pinctrl driver"
> depends on IMX_SCU
> select PINCTRL_IMX
>
> diff --git a/drivers/pinctrl/freescale/pinctrl-imx.c b/drivers/pinctrl/freescale/pinctrl-imx.c
> index 507e4af..b80c450 100644
> --- a/drivers/pinctrl/freescale/pinctrl-imx.c
> +++ b/drivers/pinctrl/freescale/pinctrl-imx.c
> @@ -373,7 +373,7 @@ static int imx_pinconf_get(struct pinctrl_dev *pctldev,
> const struct imx_pinctrl_soc_info *info = ipctl->info;
>
> if (info->flags & IMX_USE_SCU)
> - return imx_pinconf_get_scu(pctldev, pin_id, config);
> + return info->imx_pinconf_get(pctldev, pin_id, config);
> else
> return imx_pinconf_get_mmio(pctldev, pin_id, config);
> }
> @@ -423,7 +423,7 @@ static int imx_pinconf_set(struct pinctrl_dev *pctldev,
> const struct imx_pinctrl_soc_info *info = ipctl->info;
>
> if (info->flags & IMX_USE_SCU)
> - return imx_pinconf_set_scu(pctldev, pin_id,
> + return info->imx_pinconf_set(pctldev, pin_id,
> configs, num_configs);
> else
> return imx_pinconf_set_mmio(pctldev, pin_id,
> @@ -440,7 +440,7 @@ static void imx_pinconf_dbg_show(struct pinctrl_dev *pctldev,
> int ret;
>
> if (info->flags & IMX_USE_SCU) {
> - ret = imx_pinconf_get_scu(pctldev, pin_id, &config);
> + ret = info->imx_pinconf_get(pctldev, pin_id, &config);
> if (ret) {
> dev_err(ipctl->dev, "failed to get %s pinconf\n",
> pin_get_name(pctldev, pin_id));
> @@ -629,7 +629,7 @@ static int imx_pinctrl_parse_groups(struct device_node *np,
> for (i = 0; i < grp->num_pins; i++) {
> pin = &((struct imx_pin *)(grp->data))[i];
> if (info->flags & IMX_USE_SCU)
> - imx_pinctrl_parse_pin_scu(ipctl, &grp->pins[i],
> + info->imx_pinctrl_parse_pin(ipctl, &grp->pins[i],
> pin, &list);
> else
> imx_pinctrl_parse_pin_mmio(ipctl, &grp->pins[i],
> diff --git a/drivers/pinctrl/freescale/pinctrl-imx.h b/drivers/pinctrl/freescale/pinctrl-imx.h
> index 333d32b..bdb86c2 100644
> --- a/drivers/pinctrl/freescale/pinctrl-imx.h
> +++ b/drivers/pinctrl/freescale/pinctrl-imx.h
> @@ -75,6 +75,21 @@ struct imx_cfg_params_decode {
> bool invert;
> };
>
> +/**
> + * @dev: a pointer back to containing device
> + * @base: the offset to the controller in virtual memory
> + */
> +struct imx_pinctrl {
> + struct device *dev;
> + struct pinctrl_dev *pctl;
> + void __iomem *base;
> + void __iomem *input_sel_base;
> + const struct imx_pinctrl_soc_info *info;
> + struct imx_pin_reg *pin_regs;
> + unsigned int group_index;
> + struct mutex mutex;
> +};
> +
> struct imx_pinctrl_soc_info {
> const struct pinctrl_pin_desc *pins;
> unsigned int npins;
> @@ -98,21 +113,13 @@ struct imx_pinctrl_soc_info {
> struct pinctrl_gpio_range *range,
> unsigned offset,
> bool input);
> -};
> -
> -/**
> - * @dev: a pointer back to containing device
> - * @base: the offset to the controller in virtual memory
> - */
> -struct imx_pinctrl {
> - struct device *dev;
> - struct pinctrl_dev *pctl;
> - void __iomem *base;
> - void __iomem *input_sel_base;
> - const struct imx_pinctrl_soc_info *info;
> - struct imx_pin_reg *pin_regs;
> - unsigned int group_index;
> - struct mutex mutex;
> + int (*imx_pinconf_get)(struct pinctrl_dev *pctldev, unsigned int pin_id,
> + unsigned long *config);
> + int (*imx_pinconf_set)(struct pinctrl_dev *pctldev, unsigned int pin_id,
> + unsigned long *configs, unsigned int num_configs);
> + void (*imx_pinctrl_parse_pin)(struct imx_pinctrl *ipctl,
> + unsigned int *pin_id, struct imx_pin *pin,
> + const __be32 **list_p);
> };
>
> #define IMX_CFG_PARAMS_DECODE(p, m, o) \
> @@ -137,7 +144,7 @@ struct imx_pinctrl {
> int imx_pinctrl_probe(struct platform_device *pdev,
> const struct imx_pinctrl_soc_info *info);
>
> -#ifdef CONFIG_PINCTRL_IMX_SCU
> +#if IS_ENABLED(CONFIG_PINCTRL_IMX_SCU)
> #define BM_PAD_CTL_GP_ENABLE BIT(30)
> #define BM_PAD_CTL_IFMUX_ENABLE BIT(31)
> #define BP_PAD_CTL_IFMUX 27
> @@ -150,23 +157,5 @@ int imx_pinconf_set_scu(struct pinctrl_dev *pctldev, unsigned pin_id,
> void imx_pinctrl_parse_pin_scu(struct imx_pinctrl *ipctl,
> unsigned int *pin_id, struct imx_pin *pin,
> const __be32 **list_p);
> -#else
> -static inline int imx_pinconf_get_scu(struct pinctrl_dev *pctldev,
> - unsigned pin_id, unsigned long *config)
> -{
> - return -EINVAL;
> -}
> -static inline int imx_pinconf_set_scu(struct pinctrl_dev *pctldev,
> - unsigned pin_id, unsigned long *configs,
> - unsigned num_configs)
> -{
> - return -EINVAL;
> -}
> -static inline void imx_pinctrl_parse_pin_scu(struct imx_pinctrl *ipctl,
> - unsigned int *pin_id,
> - struct imx_pin *pin,
> - const __be32 **list_p)
> -{
> -}
> #endif
> #endif /* __DRIVERS_PINCTRL_IMX_H */
> diff --git a/drivers/pinctrl/freescale/pinctrl-imx8dxl.c b/drivers/pinctrl/freescale/pinctrl-imx8dxl.c
> index 12b97da..d3020c0 100644
> --- a/drivers/pinctrl/freescale/pinctrl-imx8dxl.c
> +++ b/drivers/pinctrl/freescale/pinctrl-imx8dxl.c
> @@ -159,6 +159,9 @@ static struct imx_pinctrl_soc_info imx8dxl_pinctrl_info = {
> .pins = imx8dxl_pinctrl_pads,
> .npins = ARRAY_SIZE(imx8dxl_pinctrl_pads),
> .flags = IMX_USE_SCU,
> + .imx_pinconf_get = imx_pinconf_get_scu,
> + .imx_pinconf_set = imx_pinconf_set_scu,
> + .imx_pinctrl_parse_pin = imx_pinctrl_parse_pin_scu,
> };
>
> static const struct of_device_id imx8dxl_pinctrl_of_match[] = {
> diff --git a/drivers/pinctrl/freescale/pinctrl-imx8qm.c b/drivers/pinctrl/freescale/pinctrl-imx8qm.c
> index 095acf4..8f46b940 100644
> --- a/drivers/pinctrl/freescale/pinctrl-imx8qm.c
> +++ b/drivers/pinctrl/freescale/pinctrl-imx8qm.c
> @@ -292,6 +292,9 @@ static const struct imx_pinctrl_soc_info imx8qm_pinctrl_info = {
> .pins = imx8qm_pinctrl_pads,
> .npins = ARRAY_SIZE(imx8qm_pinctrl_pads),
> .flags = IMX_USE_SCU,
> + .imx_pinconf_get = imx_pinconf_get_scu,
> + .imx_pinconf_set = imx_pinconf_set_scu,
> + .imx_pinctrl_parse_pin = imx_pinctrl_parse_pin_scu,
> };
>
> static const struct of_device_id imx8qm_pinctrl_of_match[] = {
> diff --git a/drivers/pinctrl/freescale/pinctrl-imx8qxp.c b/drivers/pinctrl/freescale/pinctrl-imx8qxp.c
> index 81ebd4c..6776ad6 100644
> --- a/drivers/pinctrl/freescale/pinctrl-imx8qxp.c
> +++ b/drivers/pinctrl/freescale/pinctrl-imx8qxp.c
> @@ -198,6 +198,9 @@ static struct imx_pinctrl_soc_info imx8qxp_pinctrl_info = {
> .pins = imx8qxp_pinctrl_pads,
> .npins = ARRAY_SIZE(imx8qxp_pinctrl_pads),
> .flags = IMX_USE_SCU,
> + .imx_pinconf_get = imx_pinconf_get_scu,
> + .imx_pinconf_set = imx_pinconf_set_scu,
> + .imx_pinctrl_parse_pin = imx_pinctrl_parse_pin_scu,
> };
>
> static const struct of_device_id imx8qxp_pinctrl_of_match[] = {
> diff --git a/drivers/pinctrl/freescale/pinctrl-scu.c b/drivers/pinctrl/freescale/pinctrl-scu.c
> index 9df45d3..59b5f8a 100644
> --- a/drivers/pinctrl/freescale/pinctrl-scu.c
> +++ b/drivers/pinctrl/freescale/pinctrl-scu.c
> @@ -7,6 +7,7 @@
>
> #include <linux/err.h>
> #include <linux/firmware/imx/sci.h>
> +#include <linux/module.h>
> #include <linux/of_address.h>
> #include <linux/pinctrl/pinctrl.h>
> #include <linux/platform_device.h>
> @@ -123,3 +124,7 @@ void imx_pinctrl_parse_pin_scu(struct imx_pinctrl *ipctl,
> pin_scu->mux_mode, pin_scu->config);
> }
> EXPORT_SYMBOL_GPL(imx_pinctrl_parse_pin_scu);
> +
> +MODULE_AUTHOR("Dong Aisheng <aisheng.dong@....com>");
> +MODULE_DESCRIPTION("NXP i.MX SCU common pinctrl driver");
> +MODULE_LICENSE("GPL v2");
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