linux-kernel - Re: [PATCH 07/14] net: lpc-enet: move phy setup into platform code

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Date:   Tue, 6 Aug 2019 16:11:38 -0400
From:   Sylvain Lemieux <slemieux.tyco@...il.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     soc@...nel.org,
        "moderated list:ARM PORT" <linux-arm-kernel@...ts.infradead.org>,
        Vladimir Zapolskiy <vz@...ia.com>,
        Russell King <linux@...linux.org.uk>,
        Gregory Clement <gregory.clement@...tlin.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Jason Cooper <jason@...edaemon.net>,
        Andrew Lunn <andrew@...n.ch>,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Alan Stern <stern@...land.harvard.edu>,
        Guenter Roeck <linux@...ck-us.net>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Networking <netdev@...r.kernel.org>,
        linux-serial@...r.kernel.org, USB list <linux-usb@...r.kernel.org>,
        LINUXWATCHDOG <linux-watchdog@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 07/14] net: lpc-enet: move phy setup into platform code

On Wed, Jul 31, 2019 at 4:01 PM Arnd Bergmann <arnd@...db.de> wrote:
>
> Setting the phy mode requires touching a platform specific
> register, which prevents us from building the driver without
> its header files.
>
> Move it into a separate function in arch/arm/mach/lpc32xx
> to hide the core registers from the network driver.
>
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  arch/arm/mach-lpc32xx/common.c       | 12 ++++++++++++
>  drivers/net/ethernet/nxp/lpc_eth.c   | 12 +-----------
>  include/linux/soc/nxp/lpc32xx-misc.h |  5 +++++
>  3 files changed, 18 insertions(+), 11 deletions(-)
>
> diff --git a/arch/arm/mach-lpc32xx/common.c b/arch/arm/mach-lpc32xx/common.c
> index f648324d5fb4..a475339333c1 100644
> --- a/arch/arm/mach-lpc32xx/common.c
> +++ b/arch/arm/mach-lpc32xx/common.c
> @@ -63,6 +63,18 @@ u32 lpc32xx_return_iram(void __iomem **mapbase, dma_addr_t *dmaaddr)
>  }
>  EXPORT_SYMBOL_GPL(lpc32xx_return_iram);
>
> +void lpc32xx_set_phy_interface_mode(phy_interface_t mode)
> +{
> +       u32 tmp = __raw_readl(LPC32XX_CLKPWR_MACCLK_CTRL);
> +       tmp &= ~LPC32XX_CLKPWR_MACCTRL_PINS_MSK;
> +       if (mode == PHY_INTERFACE_MODE_MII)
> +               tmp |= LPC32XX_CLKPWR_MACCTRL_USE_MII_PINS;
> +       else
> +               tmp |= LPC32XX_CLKPWR_MACCTRL_USE_RMII_PINS;
> +       __raw_writel(tmp, LPC32XX_CLKPWR_MACCLK_CTRL);
> +}
> +EXPORT_SYMBOL_GPL(lpc32xx_set_phy_interface_mode);
> +
>  static struct map_desc lpc32xx_io_desc[] __initdata = {
>         {
>                 .virtual        = (unsigned long)IO_ADDRESS(LPC32XX_AHB0_START),
> diff --git a/drivers/net/ethernet/nxp/lpc_eth.c b/drivers/net/ethernet/nxp/lpc_eth.c
> index bcdd0adcfb0c..0893b77c385d 100644
> --- a/drivers/net/ethernet/nxp/lpc_eth.c
> +++ b/drivers/net/ethernet/nxp/lpc_eth.c
> @@ -20,9 +20,6 @@
>  #include <linux/spinlock.h>
>  #include <linux/soc/nxp/lpc32xx-misc.h>
>
> -#include <mach/hardware.h>
> -#include <mach/platform.h>
> -
>  #define MODNAME "lpc-eth"
>  #define DRV_VERSION "1.00"
>
> @@ -1237,16 +1234,9 @@ static int lpc_eth_drv_probe(struct platform_device *pdev)
>         dma_addr_t dma_handle;
>         struct resource *res;
>         int irq, ret;
> -       u32 tmp;
>
>         /* Setup network interface for RMII or MII mode */
> -       tmp = __raw_readl(LPC32XX_CLKPWR_MACCLK_CTRL);
> -       tmp &= ~LPC32XX_CLKPWR_MACCTRL_PINS_MSK;
> -       if (lpc_phy_interface_mode(dev) == PHY_INTERFACE_MODE_MII)
> -               tmp |= LPC32XX_CLKPWR_MACCTRL_USE_MII_PINS;
> -       else
> -               tmp |= LPC32XX_CLKPWR_MACCTRL_USE_RMII_PINS;
> -       __raw_writel(tmp, LPC32XX_CLKPWR_MACCLK_CTRL);
> +       lpc32xx_set_phy_interface_mode(lpc_phy_interface_mode(dev));
>
>         /* Get platform resources */
>         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> diff --git a/include/linux/soc/nxp/lpc32xx-misc.h b/include/linux/soc/nxp/lpc32xx-misc.h
> index f232e1a1bcdc..af4f82f6cf3b 100644
> --- a/include/linux/soc/nxp/lpc32xx-misc.h
> +++ b/include/linux/soc/nxp/lpc32xx-misc.h
> @@ -9,9 +9,11 @@
>  #define __SOC_LPC32XX_MISC_H
>
>  #include <linux/types.h>
> +#include <linux/phy.h>
>
>  #ifdef CONFIG_ARCH_LPC32XX
>  extern u32 lpc32xx_return_iram(void __iomem **mapbase, dma_addr_t *dmaaddr);
> +extern void lpc32xx_set_phy_interface_mode(phy_interface_t mode);
>  #else
>  static inline u32 lpc32xx_return_iram(void __iomem **mapbase, dma_addr_t *dmaaddr)
>  {
> @@ -19,6 +21,9 @@ static inline u32 lpc32xx_return_iram(void __iomem **mapbase, dma_addr_t *dmaadd
>         *dmaaddr = 0;
>         return 0;
>  }
> +static inline void lpc32xx_set_phy_interface_mode(phy_interface_t mode)
> +{
> +}
>  #endif
>
>  #endif  /* __SOC_LPC32XX_MISC_H */
> --
> 2.20.0
>