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[73.183.52.120]) by smtp.gmail.com with ESMTPSA id af79cd13be357-8cbbf717f2bsm247046685a.35.2026.02.26.10.17.36 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 26 Feb 2026 10:17:40 -0800 (PST) From: Brian Masney Date: Thu, 26 Feb 2026 13:16:45 -0500 Subject: [PATCH 01/13] clk: add new flag CLK_ROUNDING_FW_MANAGED 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: <20260226-clk-det-rate-fw-managed-v1-1-4421dd2f6dc6@redhat.com> References: <20260226-clk-det-rate-fw-managed-v1-0-4421dd2f6dc6@redhat.com> In-Reply-To: <20260226-clk-det-rate-fw-managed-v1-0-4421dd2f6dc6@redhat.com> To: Michael Turquette , Stephen Boyd Cc: linux-clk@vger.kernel.org, linux-kernel@vger.kernel.org, Brian Masney , Abel Vesa , Andrea della Porta , Baolin Wang , Bjorn Andersson , Chanwoo Choi , Frank Li , Geert Uytterhoeven , Krzysztof Kozlowski , Orson Zhai , Sascha Hauer , Sudeep Holla , Sylwester Nawrocki , Tudor Ambarus , Alim Akhtar , arm-scmi@vger.kernel.org, Chunyan Zhang , Cristian Marussi , Fabio Estevam , imx@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-arm-msm@vger.kernel.org, linux-renesas-soc@vger.kernel.org, linux-samsung-soc@vger.kernel.org, Peng Fan , Pengutronix Kernel Team X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=4829; i=bmasney@redhat.com; s=20250903; h=from:subject:message-id; bh=Nq3CMChIfPaEW53CpS7DRO/eUow2u/bScwRGHq/ah5A=; b=owGbwMvMwCW2/dJd9di6A+2Mp9WSGDIX9Gl/8Qhn3nT5sJOJp63wTebDqndvHZo401bZ3U3v9 fUq74XtHaUsDGJcDLJiiixLco0KIlJX2d67o8kCM4eVCWQIAxenAExEyILhf9mh5qLnnYv6ovVZ BV0j136w/qzwRDRlzgWDsnBfpx13LBkZbrjNE7DY37FVRFDaqplrc1X3XEOBzF0rNoqd8tWwMzj MAQA= X-Developer-Key: i=bmasney@redhat.com; a=openpgp; fpr=A46D32705865AA3DDEDC2904B7D2DD275D7EC087 There are some clocks where the rounding is managed by the hardware, and the determine_rate() clk ops is just a noop that simply returns 0. Add a new flag for these type of clocks, and update the clk core so that the determine_rate() clk op is not required when this flag is set. Signed-off-by: Brian Masney Acked-by: Sudeep Holla --- To: Michael Turquette To: Stephen Boyd To: Abel Vesa To: Andrea della Porta To: Baolin Wang To: Bjorn Andersson To: Chanwoo Choi To: Frank Li To: Geert Uytterhoeven To: Krzysztof Kozlowski To: Orson Zhai To: Sascha Hauer To: Sudeep Holla To: Sylwester Nawrocki To: Tudor Ambarus Cc: linux-clk@vger.kernel.org Cc: linux-kernel@vger.kernel.org Cc: Alim Akhtar Cc: arm-scmi@vger.kernel.org Cc: Chunyan Zhang Cc: Cristian Marussi Cc: Fabio Estevam Cc: imx@lists.linux.dev Cc: linux-arm-kernel@lists.infradead.org Cc: linux-arm-msm@vger.kernel.org Cc: linux-renesas-soc@vger.kernel.org Cc: linux-samsung-soc@vger.kernel.org Cc: Peng Fan Cc: Pengutronix Kernel Team --- drivers/clk/clk.c | 24 +++++++++++++++++++++--- include/linux/clk-provider.h | 2 ++ 2 files changed, 23 insertions(+), 3 deletions(-) diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c index fd418dc988b1c60c49e3ac9c0c44aa132dd5da28..0a522a0817411c7f7c6e9cffd6f= 024e672a331a8 100644 --- a/drivers/clk/clk.c +++ b/drivers/clk/clk.c @@ -1557,6 +1557,20 @@ static int __init clk_disable_unused(void) } late_initcall_sync(clk_disable_unused); =20 +/** + * clk_is_rounding_fw_managed - Check to see if clk rounding is handled by= the + * firmware. + * @core: the clk to check + * + * Clks that have this flag enabled do not need to have a determine_rate()= op + * set, and will always return success for any rounding operation since the + * firmware will deal with the rounding. + */ +static inline bool clk_is_rounding_fw_managed(struct clk_core *core) +{ + return core->flags & CLK_ROUNDING_FW_MANAGED; +} + static int clk_core_determine_round_nolock(struct clk_core *core, struct clk_rate_request *req) { @@ -1589,6 +1603,8 @@ static int clk_core_determine_round_nolock(struct clk= _core *core, req->rate =3D core->rate; } else if (core->ops->determine_rate) { return core->ops->determine_rate(core->hw, req); + } else if (clk_is_rounding_fw_managed(core)) { + return 0; } else { return -EINVAL; } @@ -1673,7 +1689,7 @@ EXPORT_SYMBOL_GPL(clk_hw_forward_rate_request); =20 static bool clk_core_can_round(struct clk_core * const core) { - return core->ops->determine_rate; + return core->ops->determine_rate || clk_is_rounding_fw_managed(core); } =20 static int clk_core_round_rate_nolock(struct clk_core *core, @@ -3528,6 +3544,7 @@ static const struct { ENTRY(CLK_IS_CRITICAL), ENTRY(CLK_OPS_PARENT_ENABLE), ENTRY(CLK_DUTY_CYCLE_PARENT), + ENTRY(CLK_ROUNDING_FW_MANAGED), #undef ENTRY }; =20 @@ -3906,7 +3923,7 @@ static int __clk_core_init(struct clk_core *core) =20 /* check that clk_ops are sane. See Documentation/driver-api/clk.rst */ if (core->ops->set_rate && !core->ops->determine_rate && - core->ops->recalc_rate) { + core->ops->recalc_rate && !clk_is_rounding_fw_managed(core)) { pr_err("%s: %s must implement .determine_rate in addition to .recalc_rat= e\n", __func__, core->name); ret =3D -EINVAL; @@ -3920,7 +3937,8 @@ static int __clk_core_init(struct clk_core *core) goto out; } =20 - if (core->ops->set_parent && !core->ops->determine_rate) { + if (core->ops->set_parent && !core->ops->determine_rate && + !clk_is_rounding_fw_managed(core)) { pr_err("%s: %s must implement .set_parent & .determine_rate\n", __func__, core->name); ret =3D -EINVAL; diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h index 1cda2c78dffaff037f0f16b0f11106b63b3a746f..187f8248a9c840c701cbbba99bb= 7cdeef7b654ee 100644 --- a/include/linux/clk-provider.h +++ b/include/linux/clk-provider.h @@ -32,6 +32,8 @@ #define CLK_OPS_PARENT_ENABLE BIT(12) /* duty cycle call may be forwarded to the parent clock */ #define CLK_DUTY_CYCLE_PARENT BIT(13) +/* clock rate rounding is managed by firmware, don't require determine_rat= e */ +#define CLK_ROUNDING_FW_MANAGED BIT(14) =20 struct clk; struct clk_hw; --=20 2.53.0