linux-kernel - Re: [PATCH] serial: 8250_pci: Use symbolic constants for EXAR's MPIO registers

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Date:	Tue, 26 Jul 2016 13:14:20 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Jan Kiszka <jan.kiszka@...mens.com>
Cc:	linux-serial@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] serial: 8250_pci: Use symbolic constants for EXAR's MPIO
 registers

On Tue, Jul 26, 2016 at 09:50:37PM +0200, Jan Kiszka wrote:
> Less magics that only require comments.
> 
> Signed-off-by: Jan Kiszka <jan.kiszka@...mens.com>
> ---
>  drivers/tty/serial/8250/8250_pci.c | 42 +++++++++++++++++++-------------------
>  include/uapi/linux/serial_reg.h    | 13 ++++++++++++
>  2 files changed, 34 insertions(+), 21 deletions(-)
> 
> diff --git a/drivers/tty/serial/8250/8250_pci.c b/drivers/tty/serial/8250/8250_pci.c
> index c1d4a8f..7f77060 100644
> --- a/drivers/tty/serial/8250/8250_pci.c
> +++ b/drivers/tty/serial/8250/8250_pci.c
> @@ -1796,18 +1796,18 @@ pci_xr17v35x_setup(struct serial_private *priv,
>  	 * Setup Multipurpose Input/Output pins.
>  	 */
>  	if (idx == 0) {
> -		writeb(0x00, p + 0x8f); /*MPIOINT[7:0]*/
> -		writeb(0x00, p + 0x90); /*MPIOLVL[7:0]*/
> -		writeb(0x00, p + 0x91); /*MPIO3T[7:0]*/
> -		writeb(0x00, p + 0x92); /*MPIOINV[7:0]*/
> -		writeb(0x00, p + 0x93); /*MPIOSEL[7:0]*/
> -		writeb(0x00, p + 0x94); /*MPIOOD[7:0]*/
> -		writeb(0x00, p + 0x95); /*MPIOINT[15:8]*/
> -		writeb(0x00, p + 0x96); /*MPIOLVL[15:8]*/
> -		writeb(0x00, p + 0x97); /*MPIO3T[15:8]*/
> -		writeb(0x00, p + 0x98); /*MPIOINV[15:8]*/
> -		writeb(0x00, p + 0x99); /*MPIOSEL[15:8]*/
> -		writeb(0x00, p + 0x9a); /*MPIOOD[15:8]*/
> +		writeb(0x00, p + UART_EXAR_MPIOINT_7_0);
> +		writeb(0x00, p + UART_EXAR_MPIOLVL_7_0);
> +		writeb(0x00, p + UART_EXAR_MPIO3T_7_0);
> +		writeb(0x00, p + UART_EXAR_MPIOINV_7_0);
> +		writeb(0x00, p + UART_EXAR_MPIOSEL_7_0);
> +		writeb(0x00, p + UART_EXAR_MPIOOD_7_0);
> +		writeb(0x00, p + UART_EXAR_MPIOINT_15_8);
> +		writeb(0x00, p + UART_EXAR_MPIOLVL_15_8);
> +		writeb(0x00, p + UART_EXAR_MPIO3T_15_8);
> +		writeb(0x00, p + UART_EXAR_MPIOINV_15_8);
> +		writeb(0x00, p + UART_EXAR_MPIOSEL_15_8);
> +		writeb(0x00, p + UART_EXAR_MPIOOD_15_8);
>  	}
>  	writeb(0x00, p + UART_EXAR_8XMODE);
>  	writeb(UART_FCTR_EXAR_TRGD, p + UART_EXAR_FCTR);
> @@ -1843,20 +1843,20 @@ pci_fastcom335_setup(struct serial_private *priv,
>  		switch (priv->dev->device) {
>  		case PCI_DEVICE_ID_COMMTECH_4222PCI335:
>  		case PCI_DEVICE_ID_COMMTECH_4224PCI335:
> -			writeb(0x78, p + 0x90); /* MPIOLVL[7:0] */
> -			writeb(0x00, p + 0x92); /* MPIOINV[7:0] */
> -			writeb(0x00, p + 0x93); /* MPIOSEL[7:0] */
> +			writeb(0x78, p + UART_EXAR_MPIOLVL_7_0);
> +			writeb(0x00, p + UART_EXAR_MPIOINV_7_0);
> +			writeb(0x00, p + UART_EXAR_MPIOSEL_7_0);
>  			break;
>  		case PCI_DEVICE_ID_COMMTECH_2324PCI335:
>  		case PCI_DEVICE_ID_COMMTECH_2328PCI335:
> -			writeb(0x00, p + 0x90); /* MPIOLVL[7:0] */
> -			writeb(0xc0, p + 0x92); /* MPIOINV[7:0] */
> -			writeb(0xc0, p + 0x93); /* MPIOSEL[7:0] */
> +			writeb(0x00, p + UART_EXAR_MPIOLVL_7_0);
> +			writeb(0xc0, p + UART_EXAR_MPIOINV_7_0);
> +			writeb(0xc0, p + UART_EXAR_MPIOSEL_7_0);
>  			break;
>  		}
> -		writeb(0x00, p + 0x8f); /* MPIOINT[7:0] */
> -		writeb(0x00, p + 0x91); /* MPIO3T[7:0] */
> -		writeb(0x00, p + 0x94); /* MPIOOD[7:0] */
> +		writeb(0x00, p + UART_EXAR_MPIOINT_7_0);
> +		writeb(0x00, p + UART_EXAR_MPIO3T_7_0);
> +		writeb(0x00, p + UART_EXAR_MPIOOD_7_0);
>  	}
>  	writeb(0x00, p + UART_EXAR_8XMODE);
>  	writeb(UART_FCTR_EXAR_TRGD, p + UART_EXAR_FCTR);
> diff --git a/include/uapi/linux/serial_reg.h b/include/uapi/linux/serial_reg.h
> index 1e5ac4e7..d176448 100644
> --- a/include/uapi/linux/serial_reg.h
> +++ b/include/uapi/linux/serial_reg.h
> @@ -376,5 +376,18 @@
>  #define UART_EXAR_TXTRG		0x0a	/* Tx FIFO trigger level write-only */
>  #define UART_EXAR_RXTRG		0x0b	/* Rx FIFO trigger level write-only */
>  
> +#define UART_EXAR_MPIOINT_7_0	0x8f	/* MPIOINT[7:0] */
> +#define UART_EXAR_MPIOLVL_7_0	0x90	/* MPIOLVL[7:0] */
> +#define UART_EXAR_MPIO3T_7_0	0x91	/* MPIO3T[7:0] */
> +#define UART_EXAR_MPIOINV_7_0	0x92	/* MPIOINV[7:0] */
> +#define UART_EXAR_MPIOSEL_7_0	0x93	/* MPIOSEL[7:0] */
> +#define UART_EXAR_MPIOOD_7_0	0x94	/* MPIOOD[7:0] */
> +#define UART_EXAR_MPIOINT_15_8	0x95	/* MPIOINT[15:8] */
> +#define UART_EXAR_MPIOLVL_15_8	0x96	/* MPIOLVL[15:8] */
> +#define UART_EXAR_MPIO3T_15_8	0x97	/* MPIO3T[15:8] */
> +#define UART_EXAR_MPIOINV_15_8	0x98	/* MPIOINV[15:8] */
> +#define UART_EXAR_MPIOSEL_15_8	0x99	/* MPIOSEL[15:8] */
> +#define UART_EXAR_MPIOOD_15_8	0x9a	/* MPIOOD[15:8] */
> +

Why are you putting these in a user api file?  I know it matches the
existing ones, but is this something that userspace really cares about?

thanks,

greg k-h