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([2a01:e0a:982:cbb0:106:cd85:84ae:7b]) by smtp.gmail.com with ESMTPSA id z5-20020adfd0c5000000b003143aa0ca8asm4266162wrh.13.2023.07.04.07.42.39 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 04 Jul 2023 07:42:40 -0700 (PDT) Message-ID: Date: Tue, 4 Jul 2023 16:42:39 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.12.0 From: neil.armstrong@linaro.org Content-Language: en-US To: Dmitry Rokosov , gregkh@linuxfoundation.org, robh+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org, conor+dt@kernel.org, jbrunet@baylibre.com, jirislaby@kernel.org, khilman@baylibre.com, martin.blumenstingl@googlemail.com Cc: kelvin.zhang@amlogic.com, xianwei.zhao@amlogic.com, kernel@sberdevices.ru, rockosov@gmail.com, linux-amlogic@lists.infradead.org, linux-serial@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org References: <20230704135936.14697-1-ddrokosov@sberdevices.ru> <20230704135936.14697-4-ddrokosov@sberdevices.ru> Organization: Linaro Developer Services Subject: Re: [PATCH v1 3/5] tty: serial: meson: apply ttyS devname instead of ttyAML for new SoCs In-Reply-To: <20230704135936.14697-4-ddrokosov@sberdevices.ru> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230704_074245_010462_6088EC36 X-CRM114-Status: GOOD ( 26.57 ) X-BeenThere: linux-amlogic@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: neil.armstrong@linaro.org Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "linux-amlogic" Errors-To: linux-amlogic-bounces+linux-amlogic=archiver.kernel.org@lists.infradead.org On 04/07/2023 15:59, Dmitry Rokosov wrote: > It is worth noting that the devname ttyS is a widely recognized tty name > and is commonly used by many uart device drivers. Given the established > usage and compatibility concerns, it may not be feasible to change the > devname for older SoCs. However, for new definitions, it is acceptable > and even recommended to use a new devname to help ensure clarity and > avoid any potential conflicts on lower or upper software levels. In > addition, modify the meson_uart_dt match data for g12a, a1, and s4 to > their appropriate values to ensure proper devname values and > functionality. I'm not confident about modifying a global struct from a probe, I think you should add a separate meson_uart_driver/meson_serial_console couple with ttyS instead of ttyAML, refer to the right uart_driver in meson_uart_data and in probe() register it and pass it to uart_add_one_port(). Neil > > For more information please refer to IRC discussion at [1]. > > Links: > [1]: https://libera.irclog.whitequark.org/linux-amlogic/2023-07-03 > > Signed-off-by: Dmitry Rokosov > --- > drivers/tty/serial/meson_uart.c | 33 +++++++++++++++++++++++++++++++-- > 1 file changed, 31 insertions(+), 2 deletions(-) > > diff --git a/drivers/tty/serial/meson_uart.c b/drivers/tty/serial/meson_uart.c > index 87c0eb5f2dba..361f9326b527 100644 > --- a/drivers/tty/serial/meson_uart.c > +++ b/drivers/tty/serial/meson_uart.c > @@ -82,6 +82,7 @@ static struct uart_driver meson_uart_driver; > static struct uart_port *meson_ports[AML_UART_PORT_NUM]; > > struct meson_uart_data { > + const char *dev_name; > bool has_xtal_div2; > }; > > @@ -683,6 +684,7 @@ static int meson_uart_probe_clocks(struct platform_device *pdev, > > static int meson_uart_probe(struct platform_device *pdev) > { > + const struct meson_uart_data *priv_data; > struct resource *res_mem; > struct uart_port *port; > u32 fifosize = 64; /* Default is 64, 128 for EE UART_0 */ > @@ -729,6 +731,18 @@ static int meson_uart_probe(struct platform_device *pdev) > if (ret) > return ret; > > + priv_data = device_get_match_data(&pdev->dev); > + > + if (priv_data) { > + struct console *cons = meson_uart_driver.cons; > + > + meson_uart_driver.dev_name = priv_data->dev_name; > + > + if (cons) > + strscpy(cons->name, priv_data->dev_name, > + sizeof(cons->name)); > + } > + > if (!meson_uart_driver.state) { > ret = uart_register_driver(&meson_uart_driver); > if (ret) > @@ -748,7 +762,7 @@ static int meson_uart_probe(struct platform_device *pdev) > port->x_char = 0; > port->ops = &meson_uart_ops; > port->fifosize = fifosize; > - port->private_data = (void *)device_get_match_data(&pdev->dev); > + port->private_data = (void *)priv_data; > > meson_ports[pdev->id] = port; > platform_set_drvdata(pdev, port); > @@ -780,6 +794,17 @@ static int meson_uart_remove(struct platform_device *pdev) > } > > static struct meson_uart_data meson_g12a_uart_data = { > + .dev_name = "ttyAML", > + .has_xtal_div2 = true, > +}; > + > +static struct meson_uart_data meson_a1_uart_data = { > + .dev_name = "ttyS", > + .has_xtal_div2 = false, > +}; > + > +static struct meson_uart_data meson_s4_uart_data = { > + .dev_name = "ttyS", > .has_xtal_div2 = true, > }; > > @@ -794,7 +819,11 @@ static const struct of_device_id meson_uart_dt_match[] = { > }, > { > .compatible = "amlogic,meson-s4-uart", > - .data = (void *)&meson_g12a_uart_data, > + .data = (void *)&meson_s4_uart_data, > + }, > + { > + .compatible = "amlogic,meson-a1-uart", > + .data = (void *)&meson_a1_uart_data, > }, > { /* sentinel */ }, > }; _______________________________________________ linux-amlogic mailing list linux-amlogic@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-amlogic