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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Simon Horman , Philipp Zabel , Russell King , Geert Uytterhoeven , Magnus Damm Cc: linux-renesas-soc@vger.kernel.org, netdev@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Prabhakar , Biju Das , Fabrizio Castro , Lad Prabhakar Subject: [PATCH net-next 05/11] net: dsa: rzn1-a5psw: Add support for optional reset control Date: Fri, 21 Nov 2025 11:35:31 +0000 Message-ID: <20251121113553.2955854-6-prabhakar.mahadev-lad.rj@bp.renesas.com> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20251121113553.2955854-1-prabhakar.mahadev-lad.rj@bp.renesas.com> References: <20251121113553.2955854-1-prabhakar.mahadev-lad.rj@bp.renesas.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Lad Prabhakar Add support for an optional reset control to the RZN1 A5PSW driver. Obtain the reset line using devm_reset_control_get_optional_exclusive_deasserted() during probe to ensure that the Ethernet switch (ETHSW) block is properly released from reset before initialization. This change prepares the driver for use on Renesas RZ/T2H and RZ/N2H SoCs, where the ETHSW IP block is connected to a dedicated reset line that must be controlled by software. Signed-off-by: Lad Prabhakar Reviewed-by: Philipp Zabel Reviewed-by: Vladimir Oltean --- drivers/net/dsa/rzn1_a5psw.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/net/dsa/rzn1_a5psw.c b/drivers/net/dsa/rzn1_a5psw.c index 1635255f58e4..7b84585a5415 100644 --- a/drivers/net/dsa/rzn1_a5psw.c +++ b/drivers/net/dsa/rzn1_a5psw.c @@ -13,6 +13,7 @@ #include #include #include +#include #include =20 #include "rzn1_a5psw.h" @@ -1205,6 +1206,7 @@ static int a5psw_pcs_get(struct a5psw *a5psw) static int a5psw_probe(struct platform_device *pdev) { struct device *dev =3D &pdev->dev; + struct reset_control *reset; struct device_node *mdio; struct dsa_switch *ds; struct a5psw *a5psw; @@ -1241,6 +1243,12 @@ static int a5psw_probe(struct platform_device *pdev) goto free_pcs; } =20 + reset =3D devm_reset_control_get_optional_exclusive_deasserted(dev, NULL); + if (IS_ERR(reset)) { + ret =3D PTR_ERR(reset); + goto free_pcs; + } + mdio =3D of_get_available_child_by_name(dev->of_node, "mdio"); if (mdio) { ret =3D a5psw_probe_mdio(a5psw, mdio); --=20 2.52.0