Re: [PATCH] arm64: dts: ti: k3-am68-sk-base-board: Add clklb pin mux for mmc1

[Nishanth Menon <nm@ti.com>]

On 13:19-20240808, Neha Malcom Francis wrote:
> Hi Bhavya
> 
> On 08/08/24 13:08, Bhavya Kapoor wrote:
> > Hi Neha,
> > 
> > On 08/08/24 11:51 am, Neha Malcom Francis wrote:
> > > Hi Bhavya
> > > 
> > > On 07/08/24 15:46, Bhavya Kapoor wrote:
> > > > mmc1 was not functional since pin mux for clklb was not present.
> > > > Thus, add clklb pin mux to get MMC working.
> > > > 
> > > > Fixes: a266c180b398 ("arm64: dts: ti: k3-am68-sk: Add support
> > > > for AM68 SK base board")
> > > > Signed-off-by: Bhavya Kapoor <b-kapoor@ti.com>
> > > > ---
> > > > 
> > > > rebased to next-20240807
> > > > 
> > > >   arch/arm64/boot/dts/ti/k3-am68-sk-base-board.dts | 1 +
> > > >   1 file changed, 1 insertion(+)
> > > > 
> > > > diff --git a/arch/arm64/boot/dts/ti/k3-am68-sk-base-board.dts
> > > > b/arch/arm64/boot/dts/ti/k3-am68-sk-base-board.dts
> > > > index 90dbe31c5b81..d5ceab79536c 100644
> > > > --- a/arch/arm64/boot/dts/ti/k3-am68-sk-base-board.dts
> > > > +++ b/arch/arm64/boot/dts/ti/k3-am68-sk-base-board.dts
> > > > @@ -204,6 +204,7 @@ main_mmc1_pins_default: main-mmc1-default-pins {
> > > >           pinctrl-single,pins = <
> > > >               J721S2_IOPAD(0x104, PIN_INPUT, 0) /* (P23) MMC1_CLK */
> > > >               J721S2_IOPAD(0x108, PIN_INPUT, 0) /* (N24) MMC1_CMD */
> > > > +            J721S2_IOPAD(0x100, PIN_INPUT, 0) /* (###) MMC1_CLKLB */
> > > >               J721S2_IOPAD(0x0fc, PIN_INPUT, 0) /* (M23) MMC1_DAT0 */
> > > >               J721S2_IOPAD(0x0f8, PIN_INPUT, 0) /* (P24) MMC1_DAT1 */
> > > >               J721S2_IOPAD(0x0f4, PIN_INPUT, 0) /* (R24) MMC1_DAT2 */
> > > 
> > > How is this different from the P23 pinmux for MMC1_CLK? Could you
> > > explain what CLKLB is, since it doesn't have a ball number I'm
> > > finding it difficult to understand what it is?
> > > 
> > This pin needs to be setup so that MMC_CLK is looped back at pad level
> > for highspeed SDIO operations (has been same across K3 family). MMC0/1
> > has this pin configured as INPUT by reset default as these have boot
> > media
> > 

Please update the commit message with the explanation of what CLKLB pin
is. the "reset default" is a bit confusing description.


> >   These pinmuxes are derived from pinmux file shared by EVM team during
> > wakeup/board bringup.
> > 
> 
> Thank you for explaining.
> 
> Reviewed-by: Neha Malcom Francis <n-francis@ti.com>
> 



-- 
Regards,
Nishanth Menon
Key (0xDDB5849D1736249D) / Fingerprint: F8A2 8693 54EB 8232 17A3  1A34 DDB5 849D 1736 249D