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Date: Fri, 18 Nov 2022 14:31:18 +0100
From: Konrad Dybcio <konrad.dybcio@...aro.org>
To: Bartosz Golaszewski <brgl@...ev.pl>,
Andy Gross <agross@...nel.org>,
Bjorn Andersson <andersson@...nel.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Jiri Slaby <jirislaby@...nel.org>,
Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
Vinod Koul <vkoul@...nel.org>, Alex Elder <elder@...nel.org>
Cc: linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
linux-serial@...r.kernel.org,
Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: Re: [PATCH 10/15] tty: serial: qcom-geni-serial: use of_device_id
data
On 18/11/2022 13:25, Bartosz Golaszewski wrote:
> From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
>
> Instead of checking the device compatible in probe(), assign the
> device-specific data to struct of_device_id. We'll use it later when
> providing SE DMA support.
>
> Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
> ---
Reviewed-by: Konrad Dybcio <konrad.dybcio@...aro.org>
Konrad
> drivers/tty/serial/qcom_geni_serial.c | 46 ++++++++++++++++++++-------
> 1 file changed, 34 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/tty/serial/qcom_geni_serial.c b/drivers/tty/serial/qcom_geni_serial.c
> index 72d0e7b91080..6a9f3f937f29 100644
> --- a/drivers/tty/serial/qcom_geni_serial.c
> +++ b/drivers/tty/serial/qcom_geni_serial.c
> @@ -95,6 +95,11 @@
> /* We always configure 4 bytes per FIFO word */
> #define BYTES_PER_FIFO_WORD 4
>
> +struct qcom_geni_device_data {
> + bool console;
> + void (*handle_rx)(struct uart_port *uport, u32 bytes, bool drop);
> +};
> +
> struct qcom_geni_private_data {
> /* NOTE: earlycon port will have NULL here */
> struct uart_driver *drv;
> @@ -114,7 +119,6 @@ struct qcom_geni_serial_port {
> u32 tx_fifo_width;
> u32 rx_fifo_depth;
> bool setup;
> - void (*handle_rx)(struct uart_port *uport, u32 bytes, bool drop);
> unsigned int baud;
> void *rx_fifo;
> u32 loopback;
> @@ -126,6 +130,7 @@ struct qcom_geni_serial_port {
> bool cts_rts_swap;
>
> struct qcom_geni_private_data private_data;
> + const struct qcom_geni_device_data *dev_data;
> };
>
> static const struct uart_ops qcom_geni_console_pops;
> @@ -637,7 +642,7 @@ static void qcom_geni_serial_handle_rx(struct uart_port *uport, bool drop)
> total_bytes += last_word_byte_cnt;
> else
> total_bytes += BYTES_PER_FIFO_WORD;
> - port->handle_rx(uport, total_bytes, drop);
> + port->dev_data->handle_rx(uport, total_bytes, drop);
> }
>
> static void qcom_geni_serial_stop_rx(struct uart_port *uport)
> @@ -1348,13 +1353,14 @@ static int qcom_geni_serial_probe(struct platform_device *pdev)
> struct uart_port *uport;
> struct resource *res;
> int irq;
> - bool console = false;
> struct uart_driver *drv;
> + const struct qcom_geni_device_data *data;
>
> - if (of_device_is_compatible(pdev->dev.of_node, "qcom,geni-debug-uart"))
> - console = true;
> + data = of_device_get_match_data(&pdev->dev);
> + if (!data)
> + return -EINVAL;
>
> - if (console) {
> + if (data->console) {
> drv = &qcom_geni_console_driver;
> line = of_alias_get_id(pdev->dev.of_node, "serial");
> } else {
> @@ -1364,7 +1370,7 @@ static int qcom_geni_serial_probe(struct platform_device *pdev)
> line = of_alias_get_id(pdev->dev.of_node, "hsuart");
> }
>
> - port = get_port_from_line(line, console);
> + port = get_port_from_line(line, data->console);
> if (IS_ERR(port)) {
> dev_err(&pdev->dev, "Invalid line %d\n", line);
> return PTR_ERR(port);
> @@ -1376,6 +1382,7 @@ static int qcom_geni_serial_probe(struct platform_device *pdev)
> return -ENODEV;
>
> uport->dev = &pdev->dev;
> + port->dev_data = data;
> port->se.dev = &pdev->dev;
> port->se.wrapper = dev_get_drvdata(pdev->dev.parent);
> port->se.clk = devm_clk_get(&pdev->dev, "se");
> @@ -1394,7 +1401,7 @@ static int qcom_geni_serial_probe(struct platform_device *pdev)
> port->rx_fifo_depth = DEF_FIFO_DEPTH_WORDS;
> port->tx_fifo_width = DEF_FIFO_WIDTH_BITS;
>
> - if (!console) {
> + if (!data->console) {
> port->rx_fifo = devm_kcalloc(uport->dev,
> port->rx_fifo_depth, sizeof(u32), GFP_KERNEL);
> if (!port->rx_fifo)
> @@ -1424,7 +1431,7 @@ static int qcom_geni_serial_probe(struct platform_device *pdev)
> uport->irq = irq;
> uport->has_sysrq = IS_ENABLED(CONFIG_SERIAL_QCOM_GENI_CONSOLE);
>
> - if (!console)
> + if (!data->console)
> port->wakeup_irq = platform_get_irq_optional(pdev, 1);
>
> if (of_property_read_bool(pdev->dev.of_node, "rx-tx-swap"))
> @@ -1446,7 +1453,6 @@ static int qcom_geni_serial_probe(struct platform_device *pdev)
> port->private_data.drv = drv;
> uport->private_data = &port->private_data;
> platform_set_drvdata(pdev, port);
> - port->handle_rx = console ? handle_rx_console : handle_rx_uart;
>
> ret = uart_add_one_port(drv, uport);
> if (ret)
> @@ -1526,14 +1532,30 @@ static int __maybe_unused qcom_geni_serial_sys_resume(struct device *dev)
> return ret;
> }
>
> +static const struct qcom_geni_device_data qcom_geni_console_data = {
> + .console = true,
> + .handle_rx = handle_rx_console,
> +};
> +
> +static const struct qcom_geni_device_data qcom_geni_uart_data = {
> + .console = false,
> + .handle_rx = handle_rx_uart,
> +};
> +
> static const struct dev_pm_ops qcom_geni_serial_pm_ops = {
> SET_SYSTEM_SLEEP_PM_OPS(qcom_geni_serial_sys_suspend,
> qcom_geni_serial_sys_resume)
> };
>
> static const struct of_device_id qcom_geni_serial_match_table[] = {
> - { .compatible = "qcom,geni-debug-uart", },
> - { .compatible = "qcom,geni-uart", },
> + {
> + .compatible = "qcom,geni-debug-uart",
> + .data = &qcom_geni_console_data,
> + },
> + {
> + .compatible = "qcom,geni-uart",
> + .data = &qcom_geni_uart_data,
> + },
> {}
> };
> MODULE_DEVICE_TABLE(of, qcom_geni_serial_match_table);
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