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16 Sep 2016 20:42:11.2540 (UTC) X-MS-Exchange-CrossTenant-Id: fbd72e03-d4a5-4110-adce-614d51f2077a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=fbd72e03-d4a5-4110-adce-614d51f2077a;Ip=[66.35.236.227];Helo=[sj-itexedge03.altera.priv.altera.com] X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN2PR03MB1920 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Rob, On 09/16/2016 02:19 PM, Rob Herring wrote: > On Thu, Sep 08, 2016 at 11:12:18AM -0500, tthayer@opensource.altera.com wrote: >> From: Thor Thayer >> >> Add the device tree bindings needed to support the TX FIFO >> load size. >> >> Signed-off-by: Thor Thayer >> --- >> Documentation/devicetree/bindings/serial/8250.txt | 1 + >> 1 file changed, 1 insertion(+) >> >> diff --git a/Documentation/devicetree/bindings/serial/8250.txt b/Documentation/devicetree/bindings/serial/8250.txt >> index f5561ac..93de5ef 100644 >> --- a/Documentation/devicetree/bindings/serial/8250.txt >> +++ b/Documentation/devicetree/bindings/serial/8250.txt >> @@ -45,6 +45,7 @@ Optional properties: >> - {rts,cts,dtr,dsr,rng,dcd}-gpios: specify a GPIO for RTS/CTS/DTR/DSR/RI/DCD >> line respectively. It will use specified GPIO instead of the peripheral >> function pin for the UART feature. If unsure, don't specify this property. >> +- tx-loadsz: the number of bytes that can be loaded into the TX FIFO. > > It seems you don't really need to know the loadsz, but just need the > threshold trigger level. So just use that directly. And please check if > any other UARTs have threshold properties. i.MX has programmable > thresholds. > > Rob > Yes, it is correct that I only really need the loadsz, but there is a tx-loadsz parameter in the uart_8250_port structure. Since there currently isn't a way to update the default value of tx-loadsz from device tree, I thought this would be useful for other 8250 UARTs as well. Yes, there are a couple of 8250 compatible UARTs that have programmable thresholds. The SC16654 and SC16C650 are 2 examples. However, I didn't see the programmable TX threshold implemented. I looked at the i.MX UARTs but I don't see a programmable threshold parameter in the bindings( Documentation/devicetree/bindings/serial/fsl-imx-uart.txt). I'm assuming you're saying that I should use the same binding names for this transmit threshold if they are available? Thank you for reviewing and for the comments. Thor