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Tue, 6 Jan 2026 18:42:25 -0600 From: Kendall Willis Date: Tue, 6 Jan 2026 18:42:20 -0600 Subject: [PATCH v3 3/5] arm64: dts: ti: k3-am62a7-sk: Enable Main UART wakeup Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-ID: <20260106-b4-uart-daisy-chain-dts-v3-3-398a66258f2c@ti.com> References: <20260106-b4-uart-daisy-chain-dts-v3-0-398a66258f2c@ti.com> In-Reply-To: <20260106-b4-uart-daisy-chain-dts-v3-0-398a66258f2c@ti.com> To: Nishanth Menon , Vignesh Raghavendra , "Tero Kristo" , Rob Herring , "Krzysztof Kozlowski" , Conor Dooley , , CC: , , , , , , , , Kendall Willis X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1767746545; l=1898; i=k-willis@ti.com; s=20251230; h=from:subject:message-id; bh=J1q247fmp/yjxkmpD0mCxbuHEfNJBYjhRwV5KoKaNdE=; b=1lxW9r8mGCZrjpAN9TgpDdn9qhVbl5b3e8USFGI9uUDUwb/VEUO4s8yDPeqmEASmXOzCGLxnJ 8c41EUzM+IsAE+X8nk45mspagR11mKjclsBOpGUcXqfngNwXh9H+dCS X-Developer-Key: i=k-willis@ti.com; 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X-OriginatorOrg: ti.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 07 Jan 2026 00:42:31.0236 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: ffe0df6b-cb25-47dd-2c5e-08de4d85a40a X-MS-Exchange-CrossTenant-Id: e5b49634-450b-4709-8abb-1e2b19b982b7 X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=e5b49634-450b-4709-8abb-1e2b19b982b7;Ip=[198.47.21.194];Helo=[flwvzet200.ext.ti.com] X-MS-Exchange-CrossTenant-AuthSource: BN3PEPF0000B075.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS0PR10MB7341 The Main UART can resume from suspend to RAM states when PIN_WKUP_EN is enabled. Add the necessary pins needed to wakeup the system. Add the system idle states that the Main UART can wakeup the system from. The UART driver uses the "default" pinctrl state when the system is active. In the suspend hook, if the UART is wakeup enabled, the "wakeup" pinctrl state is selected by the UART driver in order to allow wakeup. Upon resume, the default pinctrl state is selected again. Reviewed-by: Markus Schneider-Pargmann Reviewed-by: Dhruva Gole Signed-off-by: Kendall Willis --- arch/arm64/boot/dts/ti/k3-am62a7-sk.dts | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) diff --git a/arch/arm64/boot/dts/ti/k3-am62a7-sk.dts b/arch/arm64/boot/dts/= ti/k3-am62a7-sk.dts index e99bdbc2e0cbdf858f1631096f9c2a086191bab3..112f0f2a3d449b324d479c0e2a7= d07d0ee57caf6 100644 --- a/arch/arm64/boot/dts/ti/k3-am62a7-sk.dts +++ b/arch/arm64/boot/dts/ti/k3-am62a7-sk.dts @@ -282,6 +282,13 @@ AM62AX_IOPAD(0x1cc, PIN_OUTPUT, 0) /* (D15) UART0_TXD = */ bootph-all; }; =20 + main_uart0_pins_wakeup: main-uart0-wakeup-pins { + pinctrl-single,pins =3D < + AM62AX_IOPAD(0x1c8, PIN_INPUT | PIN_WKUP_EN, 0) /* (E14) UART0_RXD */ + AM62AX_IOPAD(0x1cc, PIN_OUTPUT, 0) /* (D15) UART0_TXD */ + >; + }; + main_uart1_pins_default: main-uart1-default-pins { pinctrl-single,pins =3D < AM62AX_IOPAD(0x01ac, PIN_INPUT, 2) /* (B21) MCASP0_AFSR.UART1_RXD */ @@ -717,8 +724,12 @@ &main_gpio_intr { =20 &main_uart0 { status =3D "okay"; - pinctrl-names =3D "default"; + pinctrl-names =3D "default", "wakeup"; pinctrl-0 =3D <&main_uart0_pins_default>; + pinctrl-1 =3D <&main_uart0_pins_wakeup>; + wakeup-source =3D <&system_deep_sleep>, + <&system_mcu_only>, + <&system_standby>; bootph-all; }; =20 --=20 2.34.1