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Date: Wed, 23 Oct 2019 12:09:58 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Arnd Bergmann <arnd@...db.de>
Cc: Kukjin Kim <kgene@...nel.org>, Felipe Balbi <balbi@...nel.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
linux-samsung-soc@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linus.walleij@...aro.org,
linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Re: [PATCH 04/36] usb: gadget: s3c-hsudc: remove platform header
dependency
On Thu, Oct 10, 2019 at 10:29:48PM +0200, Arnd Bergmann wrote:
> There is no real phy driver, so s3c-hsudc just pokes the registers
> itself. Improve this a little by making it a platform data callback
> like we do for gpios.
>
> There is only one board using this driver, and it's unlikely
> that another would be added, so this is a minimal workaround.
>
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
> .../include/mach/regs-s3c2443-clock.h | 49 +++++++++++++++++
> arch/arm/plat-samsung/devs.c | 3 +
> drivers/usb/gadget/udc/s3c-hsudc.c | 55 ++-----------------
> include/linux/platform_data/s3c-hsudc.h | 2 +
> 4 files changed, 58 insertions(+), 51 deletions(-)
>
> diff --git a/arch/arm/mach-s3c24xx/include/mach/regs-s3c2443-clock.h b/arch/arm/mach-s3c24xx/include/mach/regs-s3c2443-clock.h
> index 6bf924612b06..682759549e63 100644
> --- a/arch/arm/mach-s3c24xx/include/mach/regs-s3c2443-clock.h
> +++ b/arch/arm/mach-s3c24xx/include/mach/regs-s3c2443-clock.h
> @@ -10,6 +10,8 @@
> #ifndef __ASM_ARM_REGS_S3C2443_CLOCK
> #define __ASM_ARM_REGS_S3C2443_CLOCK
>
> +#include <linux/delay.h>
> +
> #define S3C2443_CLKREG(x) ((x) + S3C24XX_VA_CLKPWR)
>
> #define S3C2443_PLLCON_MDIVSHIFT 16
> @@ -184,5 +186,52 @@ s3c2443_get_epll(unsigned int pllval, unsigned int baseclk)
> return (unsigned int)fvco;
> }
>
> +static inline void s3c_hsudc_init_phy(void)
> +{
> + u32 cfg;
> +
> + cfg = readl(S3C2443_PWRCFG) | S3C2443_PWRCFG_USBPHY;
> + writel(cfg, S3C2443_PWRCFG);
> +
> + cfg = readl(S3C2443_URSTCON);
> + cfg |= (S3C2443_URSTCON_FUNCRST | S3C2443_URSTCON_PHYRST);
> + writel(cfg, S3C2443_URSTCON);
> + mdelay(1);
> +
> + cfg = readl(S3C2443_URSTCON);
> + cfg &= ~(S3C2443_URSTCON_FUNCRST | S3C2443_URSTCON_PHYRST);
> + writel(cfg, S3C2443_URSTCON);
> +
> + cfg = readl(S3C2443_PHYCTRL);
> + cfg &= ~(S3C2443_PHYCTRL_CLKSEL | S3C2443_PHYCTRL_DSPORT);
> + cfg |= (S3C2443_PHYCTRL_EXTCLK | S3C2443_PHYCTRL_PLLSEL);
> + writel(cfg, S3C2443_PHYCTRL);
> +
> + cfg = readl(S3C2443_PHYPWR);
> + cfg &= ~(S3C2443_PHYPWR_FSUSPEND | S3C2443_PHYPWR_PLL_PWRDN |
> + S3C2443_PHYPWR_XO_ON | S3C2443_PHYPWR_PLL_REFCLK |
> + S3C2443_PHYPWR_ANALOG_PD);
> + cfg |= S3C2443_PHYPWR_COMMON_ON;
> + writel(cfg, S3C2443_PHYPWR);
> +
> + cfg = readl(S3C2443_UCLKCON);
> + cfg |= (S3C2443_UCLKCON_DETECT_VBUS | S3C2443_UCLKCON_FUNC_CLKEN |
> + S3C2443_UCLKCON_TCLKEN);
> + writel(cfg, S3C2443_UCLKCON);
> +}
> +
> +static inline void s3c_hsudc_uninit_phy(void)
> +{
> + u32 cfg;
> +
> + cfg = readl(S3C2443_PWRCFG) & ~S3C2443_PWRCFG_USBPHY;
> + writel(cfg, S3C2443_PWRCFG);
> +
> + writel(S3C2443_PHYPWR_FSUSPEND, S3C2443_PHYPWR);
> +
> + cfg = readl(S3C2443_UCLKCON) & ~S3C2443_UCLKCON_FUNC_CLKEN;
> + writel(cfg, S3C2443_UCLKCON);
> +}
> +
> #endif /* __ASM_ARM_REGS_S3C2443_CLOCK */
>
> diff --git a/arch/arm/plat-samsung/devs.c b/arch/arm/plat-samsung/devs.c
> index 1d1fa068d228..6e4c1cb07104 100644
> --- a/arch/arm/plat-samsung/devs.c
> +++ b/arch/arm/plat-samsung/devs.c
> @@ -40,6 +40,7 @@
> #include <mach/dma.h>
> #include <mach/irqs.h>
> #include <mach/map.h>
> +#include <mach/regs-s3c2443-clock.h>
>
> #include <plat/cpu.h>
> #include <plat/devs.h>
> @@ -1038,6 +1039,8 @@ struct platform_device s3c_device_usb_hsudc = {
> void __init s3c24xx_hsudc_set_platdata(struct s3c24xx_hsudc_platdata *pd)
> {
> s3c_set_platdata(pd, sizeof(*pd), &s3c_device_usb_hsudc);
> + pd->phy_init = s3c_hsudc_init_phy;
> + pd->phy_uninit = s3c_hsudc_uninit_phy;
> }
> #endif /* CONFIG_PLAT_S3C24XX */
>
> diff --git a/drivers/usb/gadget/udc/s3c-hsudc.c b/drivers/usb/gadget/udc/s3c-hsudc.c
> index 858993c73442..d482cbb4bb4d 100644
> --- a/drivers/usb/gadget/udc/s3c-hsudc.c
> +++ b/drivers/usb/gadget/udc/s3c-hsudc.c
> @@ -30,8 +30,6 @@
> #include <linux/regulator/consumer.h>
> #include <linux/pm_runtime.h>
>
> -#include <mach/regs-s3c2443-clock.h>
> -
> #define S3C_HSUDC_REG(x) (x)
>
> /* Non-Indexed Registers */
> @@ -186,53 +184,6 @@ static inline void __orr32(void __iomem *ptr, u32 val)
> writel(readl(ptr) | val, ptr);
> }
>
> -static void s3c_hsudc_init_phy(void)
> -{
> - u32 cfg;
> -
> - cfg = readl(S3C2443_PWRCFG) | S3C2443_PWRCFG_USBPHY;
> - writel(cfg, S3C2443_PWRCFG);
> -
> - cfg = readl(S3C2443_URSTCON);
> - cfg |= (S3C2443_URSTCON_FUNCRST | S3C2443_URSTCON_PHYRST);
> - writel(cfg, S3C2443_URSTCON);
> - mdelay(1);
> -
> - cfg = readl(S3C2443_URSTCON);
> - cfg &= ~(S3C2443_URSTCON_FUNCRST | S3C2443_URSTCON_PHYRST);
> - writel(cfg, S3C2443_URSTCON);
> -
> - cfg = readl(S3C2443_PHYCTRL);
> - cfg &= ~(S3C2443_PHYCTRL_CLKSEL | S3C2443_PHYCTRL_DSPORT);
> - cfg |= (S3C2443_PHYCTRL_EXTCLK | S3C2443_PHYCTRL_PLLSEL);
> - writel(cfg, S3C2443_PHYCTRL);
> -
> - cfg = readl(S3C2443_PHYPWR);
> - cfg &= ~(S3C2443_PHYPWR_FSUSPEND | S3C2443_PHYPWR_PLL_PWRDN |
> - S3C2443_PHYPWR_XO_ON | S3C2443_PHYPWR_PLL_REFCLK |
> - S3C2443_PHYPWR_ANALOG_PD);
> - cfg |= S3C2443_PHYPWR_COMMON_ON;
> - writel(cfg, S3C2443_PHYPWR);
> -
> - cfg = readl(S3C2443_UCLKCON);
> - cfg |= (S3C2443_UCLKCON_DETECT_VBUS | S3C2443_UCLKCON_FUNC_CLKEN |
> - S3C2443_UCLKCON_TCLKEN);
> - writel(cfg, S3C2443_UCLKCON);
> -}
> -
> -static void s3c_hsudc_uninit_phy(void)
> -{
> - u32 cfg;
> -
> - cfg = readl(S3C2443_PWRCFG) & ~S3C2443_PWRCFG_USBPHY;
> - writel(cfg, S3C2443_PWRCFG);
> -
> - writel(S3C2443_PHYPWR_FSUSPEND, S3C2443_PHYPWR);
> -
> - cfg = readl(S3C2443_UCLKCON) & ~S3C2443_UCLKCON_FUNC_CLKEN;
> - writel(cfg, S3C2443_UCLKCON);
> -}
> -
> /**
> * s3c_hsudc_complete_request - Complete a transfer request.
> * @hsep: Endpoint to which the request belongs.
> @@ -1188,7 +1139,8 @@ static int s3c_hsudc_start(struct usb_gadget *gadget,
>
> pm_runtime_get_sync(hsudc->dev);
>
> - s3c_hsudc_init_phy();
> + if (hsudc->pd->phy_init)
> + hsudc->pd->gpio_init();
Copy paste error - phy_init().
Are here (and in previous usb gadget patch) any dependencies? If so, I
would need an ack to take it through samsung-soc.
Best regards,
Krzysztof
> if (hsudc->pd->gpio_init)
> hsudc->pd->gpio_init();
>
> @@ -1210,7 +1162,8 @@ static int s3c_hsudc_stop(struct usb_gadget *gadget)
>
> spin_lock_irqsave(&hsudc->lock, flags);
> hsudc->gadget.speed = USB_SPEED_UNKNOWN;
> - s3c_hsudc_uninit_phy();
> + if (hsudc->pd->phy_uninit)
> + hsudc->pd->phy_uninit();
>
> pm_runtime_put(hsudc->dev);
>
> diff --git a/include/linux/platform_data/s3c-hsudc.h b/include/linux/platform_data/s3c-hsudc.h
> index 4dc9b8760166..a170939832d5 100644
> --- a/include/linux/platform_data/s3c-hsudc.h
> +++ b/include/linux/platform_data/s3c-hsudc.h
> @@ -26,6 +26,8 @@ struct s3c24xx_hsudc_platdata {
> unsigned int epnum;
> void (*gpio_init)(void);
> void (*gpio_uninit)(void);
> + void (*phy_init)(void);
> + void (*phy_uninit)(void);
> };
>
> #endif /* __LINUX_USB_S3C_HSUDC_H */
> --
> 2.20.0
>
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