linux-kernel - Re: [PATCH v6 2/2] tty: samsung_tty: 32-bit access for TX/RX hold registers

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Date:   Tue, 7 Apr 2020 06:49:29 +0200
From:   Jiri Slaby <jslaby@...e.com>
To:     Hyunki Koo <hyunki00.koo@...sung.com>, gregkh@...uxfoundation.org,
        krzk@...nel.org
Cc:     Rob Herring <robh+dt@...nel.org>, Kukjin Kim <kgene@...nel.org>,
        linux-serial@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org
Subject: Re: [PATCH v6 2/2] tty: samsung_tty: 32-bit access for TX/RX hold
 registers

On 07. 04. 20, 1:08, Hyunki Koo wrote:
> Support 32-bit access for the TX/RX hold registers UTXH and URXH.
> 
> This is required for some newer SoCs.
> 
> Signed-off-by: Hyunki Koo <hyunki00.koo@...sung.com>
...
> ---
>  drivers/tty/serial/samsung_tty.c | 76 +++++++++++++++++++++++++++++++++-------
>  1 file changed, 64 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/tty/serial/samsung_tty.c b/drivers/tty/serial/samsung_tty.c
> index 73f951d65b93..bdf1d4d12cb1 100644
> --- a/drivers/tty/serial/samsung_tty.c
> +++ b/drivers/tty/serial/samsung_tty.c
> @@ -154,12 +154,47 @@ struct s3c24xx_uart_port {
...
> -#define wr_regb(port, reg, val) writeb_relaxed(val, portaddr(port, reg))
> +static void wr_reg(struct uart_port *port, u32 reg, u32 val)
> +{
> +	switch (port->iotype) {
> +	case UPIO_MEM:
> +		writeb_relaxed(val, portaddr(port, reg));
> +		break;
> +	case UPIO_MEM32:
> +		writel_relaxed(val, portaddr(port, reg));
> +		break;
> +	}
> +}
> +
>  #define wr_regl(port, reg, val) writel_relaxed(val, portaddr(port, reg))
>  
> +static void wr_reg_barrier(struct uart_port *port, u32 reg, u32 val)

You need to explain, why you need this _barrier variant now. This change
should be done in a separate patch too.

> +{
> +	switch (port->iotype) {
> +	case UPIO_MEM:
> +		writeb(val, portaddr(port, reg));
> +		break;
> +	case UPIO_MEM32:
> +		writel(val, portaddr(port, reg));
> +		break;
> +	}
> +}
> +
>  /* Byte-order aware bit setting/clearing functions. */
>  
>  static inline void s3c24xx_set_bit(struct uart_port *port, int idx,

thanks,
-- 
js
suse labs