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Date: Tue, 16 Jun 2020 09:19:51 +0000
From: Aisheng Dong <aisheng.dong@....com>
To: Anson Huang <anson.huang@....com>,
"festevam@...il.com" <festevam@...il.com>,
"shawnguo@...nel.org" <shawnguo@...nel.org>,
"stefan@...er.ch" <stefan@...er.ch>,
"kernel@...gutronix.de" <kernel@...gutronix.de>,
"linus.walleij@...aro.org" <linus.walleij@...aro.org>,
"s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
"linux-gpio@...r.kernel.org" <linux-gpio@...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>
CC: dl-linux-imx <linux-imx@....com>
Subject: RE: [PATCH V5 1/9] pinctrl: imx: Support building SCU pinctrl driver
as module
> From: Anson Huang <Anson.Huang@....com>
> Sent: Thursday, June 11, 2020 7:35 PM
>
> 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.
>
> Signed-off-by: Anson Huang <Anson.Huang@....com>
> ---
> Changes since V4:
> - add module author and description.
> ---
> drivers/pinctrl/freescale/Kconfig | 2 +-
> drivers/pinctrl/freescale/pinctrl-imx.c | 18 ++++-----
> 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 | 9 +++++
> 7 files changed, 51 insertions(+), 44 deletions(-)
>
> diff --git a/drivers/pinctrl/freescale/Kconfig b/drivers/pinctrl/freescale/Kconfig
> index 4ca44dd..a3a30f1d 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 cb7e0f0..c1faae1 100644
> --- a/drivers/pinctrl/freescale/pinctrl-imx.c
> +++ b/drivers/pinctrl/freescale/pinctrl-imx.c
> @@ -372,8 +372,8 @@ static int imx_pinconf_get(struct pinctrl_dev *pctldev,
> struct imx_pinctrl *ipctl = pinctrl_dev_get_drvdata(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);
> + if ((info->flags & IMX_USE_SCU) && info->imx_pinconf_get)
> + return info->imx_pinconf_get(pctldev, pin_id, config);
Pointer check here seems not be necessary
> 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);
Compared with V4, this new implementation seems a bit complicated.
I guess we don't have to support PINCTRL_IMX=y && PINCTRL_IMX_SCU=m case.
Will that make the support a bit easier?
Regards
Aisheng
> };
>
> #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 7f32e57..be3b09e 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 0b6029b..9ba3249 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 1131dc3..05906b9 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 23cf04b..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>
> @@ -41,6 +42,7 @@ int imx_pinctrl_sc_ipc_init(struct platform_device *pdev)
> {
> return imx_scu_get_handle(&pinctrl_ipc_handle);
> }
> +EXPORT_SYMBOL_GPL(imx_pinctrl_sc_ipc_init);
>
> int imx_pinconf_get_scu(struct pinctrl_dev *pctldev, unsigned pin_id,
> unsigned long *config)
> @@ -66,6 +68,7 @@ int imx_pinconf_get_scu(struct pinctrl_dev *pctldev,
> unsigned pin_id,
>
> return 0;
> }
> +EXPORT_SYMBOL_GPL(imx_pinconf_get_scu);
>
> int imx_pinconf_set_scu(struct pinctrl_dev *pctldev, unsigned pin_id,
> unsigned long *configs, unsigned num_configs) @@ -101,6
> +104,7 @@ int imx_pinconf_set_scu(struct pinctrl_dev *pctldev, unsigned
> pin_id,
>
> return ret;
> }
> +EXPORT_SYMBOL_GPL(imx_pinconf_set_scu);
>
> void imx_pinctrl_parse_pin_scu(struct imx_pinctrl *ipctl,
> unsigned int *pin_id, struct imx_pin *pin, @@ -119,3
> +123,8 @@ void imx_pinctrl_parse_pin_scu(struct imx_pinctrl *ipctl,
> dev_dbg(ipctl->dev, "%s: 0x%x 0x%08lx", info->pins[pin->pin].name,
> 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");
> --
> 2.7.4
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