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([82.78.167.81]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-45b4dc155b8sm17356225e9.19.2025.08.21.01.03.51 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 21 Aug 2025 01:03:52 -0700 (PDT) From: Claudiu X-Google-Original-From: Claudiu To: mturquette@baylibre.com, sboyd@kernel.org, geert+renesas@glider.be, linux@armlinux.org.uk Cc: claudiu.beznea@tuxon.dev, linux-renesas-soc@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-clk@vger.kernel.org, linux-kernel@vger.kernel.org, Claudiu Beznea Subject: [PATCH 2/2] clk: renesas: rzg2l: Register PM notifier to disable unused clocks Date: Thu, 21 Aug 2025 11:03:32 +0300 Message-ID: <20250821080333.27049-3-claudiu.beznea.uj@bp.renesas.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250821080333.27049-1-claudiu.beznea.uj@bp.renesas.com> References: <20250821080333.27049-1-claudiu.beznea.uj@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: Claudiu Beznea Register a PM notifier to disable unused clocks after system resume. This is necessary when resuming from a low-power mode where the bootloader re-enables certain module clocks for its own use. To avoid keeping these clocks enabled after control is passed back to Linux, call clk_disable_unused() from a PM_POST_SUSPEND notifier. Signed-off-by: Claudiu Beznea --- drivers/clk/renesas/rzg2l-cpg.c | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) diff --git a/drivers/clk/renesas/rzg2l-cpg.c b/drivers/clk/renesas/rzg2l-cp= g.c index 187233302818..2ca32d7acaf7 100644 --- a/drivers/clk/renesas/rzg2l-cpg.c +++ b/drivers/clk/renesas/rzg2l-cpg.c @@ -24,6 +24,7 @@ #include #include #include +#include #include #include #include @@ -31,6 +32,7 @@ #include #include #include +#include #include =20 #include @@ -150,6 +152,7 @@ struct rzg2l_pll5_mux_dsi_div_param { * @info: Pointer to platform data * @genpd: PM domain * @mux_dsi_div_params: pll5 mux and dsi div parameters + * @pm_notifier: PM notifier */ struct rzg2l_cpg_priv { struct reset_controller_dev rcdev; @@ -168,6 +171,8 @@ struct rzg2l_cpg_priv { struct generic_pm_domain genpd; =20 struct rzg2l_pll5_mux_dsi_div_param mux_dsi_div_params; + + struct notifier_block pm_notifier; }; =20 static void rzg2l_cpg_del_clk_provider(void *data) @@ -1879,6 +1884,21 @@ static int __init rzg2l_cpg_add_clk_domain(struct rz= g2l_cpg_priv *priv) return of_genpd_add_provider_simple(np, genpd); } =20 +static int rzg2l_pm_notifier(struct notifier_block *nb, unsigned long acti= on, + void *data) +{ + int ret; + + if (action !=3D PM_POST_SUSPEND) + return 0; + + ret =3D clk_disable_unused(); + if (ret) + return NOTIFY_BAD; + + return NOTIFY_OK; +} + static int __init rzg2l_cpg_probe(struct platform_device *pdev) { struct device *dev =3D &pdev->dev; @@ -1948,6 +1968,10 @@ static int __init rzg2l_cpg_probe(struct platform_de= vice *pdev) return error; =20 debugfs_create_file("mstop", 0444, NULL, priv, &rzg2l_mod_clock_mstop_fop= s); + + priv->pm_notifier.notifier_call =3D rzg2l_pm_notifier; + register_pm_notifier(&priv->pm_notifier); + return 0; } =20 --=20 2.43.0