linux-kernel - Re: [PATCH] tty: serial: meson: Make the bit24 and bit [26,27] of the UART

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Message-ID: <b553aea7-cb78-830a-4a4c-51d2ee2a1850@amlogic.com>
Date:   Mon, 10 Jan 2022 16:55:05 +0800
From:   Yu Tu <yu.tu@...ogic.com>
To:     <linux-serial@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-amlogic@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>
CC:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        Neil Armstrong <narmstrong@...libre.com>,
        Kevin Hilman <khilman@...libre.com>,
        Jerome Brunet <jbrunet@...libre.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Subject: Re: [PATCH] tty: serial: meson: Make the bit24 and bit [26,27] of the
 UART_REG5 register writable

Hi All,
	I'm really sorry for sending the wrong specified file. Please ignore 
the email. I will resend V4.

On 2022/1/10 16:26, Yu Tu wrote:
> The UART_REG5 register defaults to 0. The console port is set in
> ROMCODE. But other UART ports default to 0, so make bit24 and
> bit[26,27] writable so that the UART can choose a more
> appropriate clock.
> 
> Signed-off-by: Yu Tu <yu.tu@...ogic.com>
> ---
>   drivers/tty/serial/meson_uart.c | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/tty/serial/meson_uart.c b/drivers/tty/serial/meson_uart.c
> index 7c3f30cea68e..b0551750dff8 100644
> --- a/drivers/tty/serial/meson_uart.c
> +++ b/drivers/tty/serial/meson_uart.c
> @@ -693,7 +693,7 @@ static int meson_uart_probe_clocks(struct uart_port *port)
>   							CLK_SET_RATE_NO_REPARENT,
>   							port->membase + AML_UART_REG5,
>   							26, 2,
> -							CLK_DIVIDER_READ_ONLY,
> +							CLK_DIVIDER_ROUND_CLOSEST,
>   							xtal_div_table, NULL);
>   		if (IS_ERR(hw))
>   			return PTR_ERR(hw);
> @@ -719,7 +719,7 @@ static int meson_uart_probe_clocks(struct uart_port *port)
>   					CLK_SET_RATE_PARENT,
>   					port->membase + AML_UART_REG5,
>   					24, 0x1,
> -					CLK_MUX_READ_ONLY,
> +					CLK_MUX_ROUND_CLOSEST,
>   					NULL, NULL);
>   	if (IS_ERR(hw))
>   		return PTR_ERR(hw);
> 
> base-commit: 93a770b7e16772530196674ffc79bb13fa927dc6
> prerequisite-patch-id: 95191c926509964c8e9bf4128b8bbad8a277b84a
> prerequisite-patch-id: a2e4756ff85f0df0efe111d7e2cb51b8e26e226f
> prerequisite-patch-id: 4e4d909acabcb7533da20e2207207be73454a88c