| Message ID | 20240516095733.276807-1-b-kapoor@ti.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | arm64: defconfig: Modify number of usable 8250 uart ports | expand |
On 16/05/24 3:27 pm, Bhavya Kapoor wrote: > Jacinto SoCs have a total of 12 serial uart ports. But only 8 out > of these 12 uarts can be used at a time. > > Thus, Modify maximum number of 8250 serial uart ports which can be > supported as well as modify how many 8250 serial uart ports which > we can use in the runtime to 12 for all the SoCs. > > Signed-off-by: Bhavya Kapoor <b-kapoor@ti.com> > --- rebased to next-20240516 > arch/arm64/configs/defconfig | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/arch/arm64/configs/defconfig b/arch/arm64/configs/defconfig > index 57a9abe78ee4..c693736909bc 100644 > --- a/arch/arm64/configs/defconfig > +++ b/arch/arm64/configs/defconfig > @@ -454,7 +454,8 @@ CONFIG_SERIO_AMBAKMI=y > CONFIG_LEGACY_PTY_COUNT=16 > CONFIG_SERIAL_8250=y > CONFIG_SERIAL_8250_CONSOLE=y > -CONFIG_SERIAL_8250_NR_UARTS=8 > +CONFIG_SERIAL_8250_NR_UARTS=12 > +CONFIG_SERIAL_8250_RUNTIME_UARTS=12 > CONFIG_SERIAL_8250_EXTENDED=y > CONFIG_SERIAL_8250_SHARE_IRQ=y > CONFIG_SERIAL_8250_BCM2835AUX=y
On Thu, May 16, 2024, at 09:57, Bhavya Kapoor wrote: > Jacinto SoCs have a total of 12 serial uart ports. But only 8 out > of these 12 uarts can be used at a time. > > Thus, Modify maximum number of 8250 serial uart ports which can be > supported as well as modify how many 8250 serial uart ports which > we can use in the runtime to 12 for all the SoCs. > > Signed-off-by: Bhavya Kapoor <b-kapoor@ti.com> I forget what we had already discussed here. To clarify from my side: it's ok to raise the limit if there are any known boards that connect more than 8 8250 style uarts to external devices or populated connectors. On the other hand, I don't see any dts file at the moment that has more than the maximum of 8 in k3-am642-tqma64xxl-mbax4xxl.dts. If you are adding another board that has more, it helps to clarify in the patch description that this is indeed a board requirement, and not just done because the chip has additional unused uarts. Arnd
Hi Arnd, our most boards have 6 uarts that can be used in the runtime but overall our SoC has 12 uarts. And some of our customers have this requirements that on their custom boards they use more than 8 uarts on their boards. Thus, we need to enable this to 12 uarts. Regards ~B-Kapoor On 17/05/24 12:19 pm, Arnd Bergmann wrote: > On Thu, May 16, 2024, at 09:57, Bhavya Kapoor wrote: >> Jacinto SoCs have a total of 12 serial uart ports. But only 8 out >> of these 12 uarts can be used at a time. >> >> Thus, Modify maximum number of 8250 serial uart ports which can be >> supported as well as modify how many 8250 serial uart ports which >> we can use in the runtime to 12 for all the SoCs. >> >> Signed-off-by: Bhavya Kapoor <b-kapoor@ti.com> > I forget what we had already discussed here. To clarify from my > side: it's ok to raise the limit if there are any known boards that > connect more than 8 8250 style uarts to external devices or > populated connectors. > > On the other hand, I don't see any dts file at the moment that > has more than the maximum of 8 in k3-am642-tqma64xxl-mbax4xxl.dts. > > If you are adding another board that has more, it helps to > clarify in the patch description that this is indeed a board > requirement, and not just done because the chip has additional > unused uarts. > > Arnd
On 28/05/2024 08:26, Bhavya Kapoor wrote: > Hi Arnd, our most boards have 6 uarts that can be used in the runtime > > but overall our SoC has 12 uarts. And some of our customers have this > > requirements that on their custom boards they use more than 8 uarts on their > > boards. Thus, we need to enable this to 12 uarts. defconfig is for boards in tree, for developers, not for customers. Argument that some out-of-tree user has more uarts does not mean much for defconfig. If they have some weird hardware, shall we enable it? Or if they want DEBUG_KOBJECT? Or anything else? You mistake kernel development defconfig with a distro or product config. Best regards, Krzysztof
diff --git a/arch/arm64/configs/defconfig b/arch/arm64/configs/defconfig index 57a9abe78ee4..c693736909bc 100644 --- a/arch/arm64/configs/defconfig +++ b/arch/arm64/configs/defconfig @@ -454,7 +454,8 @@ CONFIG_SERIO_AMBAKMI=y CONFIG_LEGACY_PTY_COUNT=16 CONFIG_SERIAL_8250=y CONFIG_SERIAL_8250_CONSOLE=y -CONFIG_SERIAL_8250_NR_UARTS=8 +CONFIG_SERIAL_8250_NR_UARTS=12 +CONFIG_SERIAL_8250_RUNTIME_UARTS=12 CONFIG_SERIAL_8250_EXTENDED=y CONFIG_SERIAL_8250_SHARE_IRQ=y CONFIG_SERIAL_8250_BCM2835AUX=y
Jacinto SoCs have a total of 12 serial uart ports. But only 8 out of these 12 uarts can be used at a time. Thus, Modify maximum number of 8250 serial uart ports which can be supported as well as modify how many 8250 serial uart ports which we can use in the runtime to 12 for all the SoCs. Signed-off-by: Bhavya Kapoor <b-kapoor@ti.com> --- arch/arm64/configs/defconfig | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)