linux-kernel - Re: [PATCH v2 09/41] usb: gadget: s3c-hsudc: remove platform header dependency

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Date:   Fri, 07 Aug 2020 16:59:08 +0300
From:   Felipe Balbi <balbi@...nel.org>
To:     Krzysztof Kozlowski <krzk@...nel.org>, linux-kernel@...r.kernel.org
Cc:     Arnd Bergmann <arnd@...db.de>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Russell King <linux@...linux.org.uk>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-arm-kernel@...ts.infradead.org, linux-usb@...r.kernel.org
Subject: Re: [PATCH v2 09/41] usb: gadget: s3c-hsudc: remove platform header dependency

Krzysztof Kozlowski <krzk@...nel.org> writes:

> From: Arnd Bergmann <arnd@...db.de>
>
> 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>
> [krzk: Include regs-s3c2443-clock.h in ifdef to fixup build on s3c6400]
> Signed-off-by: Krzysztof Kozlowski <krzk@...nel.org>
>
> ---
>
> Changes since v1:
> 1. Include regs-s3c2443-clock.h in ifdef to fixup build on s3c640
> ---
>  .../include/mach/regs-s3c2443-clock.h         | 49 +++++++++++++++++
>  arch/arm/plat-samsung/devs.c                  |  6 ++
>  drivers/usb/gadget/udc/s3c-hsudc.c            | 55 ++-----------------
>  include/linux/platform_data/s3c-hsudc.h       |  2 +
>  4 files changed, 61 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)

This should, really, be a PHY driver under drivers/phy, since the goal
is to make this platform-independent, might as well take the opportunity
to introduce a proper driver, no?

-- 
balbi

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