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charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-OriginatorOrg: aspeedtech.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: TY0PR06MB6855.apcprd06.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: a8c9bf6c-cd75-4da3-3a64-08def6a7fdb1 X-MS-Exchange-CrossTenant-originalarrivaltime: 10 Aug 2026 06:24:10.8787 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 43d4aa98-e35b-4575-8939-080e90d5a249 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: ZWYBxJh+9KCPLNYxclwbtiLFXi+diNOftUtemk2tIsHBU54XMkUPlbx2PnHaWWisCLsR1rSMFlRie1OFXfhI1A== X-MS-Exchange-Transport-CrossTenantHeadersStamped: SE3PR06MB8408 On Thu, 23 Jul 2026, Yu-Che Hsieh wrote:=0A= =0A= >> Some SoCs (e.g. AST2700) expose more than one physical LPC controller=0A= >> instance. Downstream devices such as KCS channels need a stable,=0A= >> globally-unique index derived from which LPC controller instance they=0A= >> belong to, so document the "lpcN" alias convention on the LPC=0A= >> controller node that lets DT authors assign a fixed index per=0A= >> instance, mirroring the existing alias-based numbering convention used= =0A= >> by mmc/i2c/spi/serial.=0A= >>=0A= >> Signed-off-by: Yu-Che Hsieh =0A= =0A= > Why is this RFC?=A0 What's stopping me from applying this now?=0A= =0A= Thanks, there is no blocker. =0A= =0A= I marked it as RFC to gather feedback on the alias-based =0A= numbering convention for LPC controllers before submitting =0A= it as a regular patch.=0A= =0A= If the approach looks acceptable, I'm happy to resend it =0A= without the RFC tag.=0A= =0A= >> ---=0A= >>=A0 Documentation/devicetree/bindings/mfd/aspeed-lpc.yaml | 7 +++++++=0A= >>=A0 1 file changed, 7 insertions(+)=0A= >>=0A= >> diff --git a/Documentation/devicetree/bindings/mfd/aspeed-lpc.yaml b/Doc= umentation/devicetree/bindings/mfd/aspeed-lpc.yaml=0A= >> index cbc3a2485a2f..81c12e0fb312 100644=0A= >> --- a/Documentation/devicetree/bindings/mfd/aspeed-lpc.yaml=0A= >> +++ b/Documentation/devicetree/bindings/mfd/aspeed-lpc.yaml=0A= >> @@ -35,6 +35,13 @@ description:=0A= >>=A0=A0=A0 configuration, therefore the host portion of the controller is = exposed as a=0A= >>=A0=A0=A0 syscon as a means to arbitrate access.=0A= >>=A0=0A= >> +=A0 On SoCs that expose more than one LPC controller instance, it is po= ssible to=0A= >> +=A0 assign a fixed index to a given instance (and thus to downstream de= vices=0A= >> +=A0 such as KCS channels that must be uniquely identified system-wide) = by=0A= >> +=A0 defining an "lpcN" alias for it in the /aliases device tree node. I= f no such=0A= > +=A0 alias is present, the SoC is treated as having a single LPC controll= er=0A= >> +=A0 instance.=0A= >> +=0A= >>=A0 properties:=0A= >>=A0=A0=A0 compatible:=0A= >>=A0=A0=A0=A0=A0 items:=0A= >>=0A= >> --=0A= >> 2.34.1=0A= >>=0A= --=0A= =0A= Yu-Che=0A= =0A=