From mboxrd@z Thu Jan 1 00:00:00 1970 From: Subject: [PATCHv2 2/4] serial: 8250: of: Load TX FIFO Threshold from DT Date: Thu, 22 Sep 2016 14:56:15 -0500 Message-ID: <1474574177-4984-3-git-send-email-tthayer@opensource.altera.com> References: <1474574177-4984-1-git-send-email-tthayer@opensource.altera.com> Mime-Version: 1.0 Content-Type: text/plain Return-path: In-Reply-To: <1474574177-4984-1-git-send-email-tthayer-yzvPICuk2ABMcg4IHK0kFoH6Mc4MB0Vx@public.gmane.org> Sender: devicetree-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: gregkh-hQyY1W1yCW8ekmWlsbkhG0B+6BGkLq7r@public.gmane.org, robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, mark.rutland-5wv7dgnIgG8@public.gmane.org, lftan-EIB2kfCEclfQT0dZR+AlfA@public.gmane.org, jslaby-IBi9RG/b67k@public.gmane.org, arnd-r2nGTMty4D4@public.gmane.org, peter-WaGBZJeGNqdsbIuE7sb01tBPR1lH4CV8@public.gmane.org, andriy.shevchenko-VuQAYsv1563Yd54FQh9/CA@public.gmane.org, anton.wuerfel-d40JDW7QUjc@public.gmane.org, phillip.raffeck-d40JDW7QUjc@public.gmane.org, yegorslists-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org, matwey-TTlVxmypnbovJsYlp49lxw@public.gmane.org, mail-APzI5cXaD1zVlRWJc41N0YvC60bnQu0Y@public.gmane.org Cc: peter.ujfalusi-l0cyMroinI0@public.gmane.org, jonathanh-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org, dongsheng.wang-3arQi8VN3Tc@public.gmane.org, luis-HiykPkW1eAzzDCI4PIEvbQC/G2K4zDHf@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-serial-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, tthayer.linux-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org, tthayer-yzvPICuk2ABMcg4IHK0kFoH6Mc4MB0Vx@public.gmane.org, nios2-dev-g9ZBwUv/Ih/yUk5EbOjzuce+I+R0W71w@public.gmane.org List-Id: devicetree@vger.kernel.org From: Thor Thayer Initialize the tx_loadsz parameter from passed in devicetree tx-threshold parameter. The tx_loadsz is calculated as the number of bytes to fill FIFO when tx-threshold is triggered. Signed-off-by: Thor Thayer --- v2 Change from reading tx-loadsz parameter to reading tx-threshold and calculating tx_loadsz. --- drivers/tty/serial/8250/8250_of.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/tty/serial/8250/8250_of.c b/drivers/tty/serial/8250/8250_of.c index 38963d7..7a8b5fc 100644 --- a/drivers/tty/serial/8250/8250_of.c +++ b/drivers/tty/serial/8250/8250_of.c @@ -195,6 +195,7 @@ static int of_platform_serial_probe(struct platform_device *ofdev) switch (port_type) { case PORT_8250 ... PORT_MAX_8250: { + u32 tx_threshold; struct uart_8250_port port8250; memset(&port8250, 0, sizeof(port8250)); port8250.port = port; @@ -202,6 +203,12 @@ static int of_platform_serial_probe(struct platform_device *ofdev) if (port.fifosize) port8250.capabilities = UART_CAP_FIFO; + /* Check for TX FIFO threshold & set tx_loadsz */ + if ((of_property_read_u32(ofdev->dev.of_node, "tx-threshold", + &tx_threshold) == 0) && + (tx_threshold < port.fifosize)) + port8250.tx_loadsz = port.fifosize - tx_threshold; + if (of_property_read_bool(ofdev->dev.of_node, "auto-flow-control")) port8250.capabilities |= UART_CAP_AFE; -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html