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Mon, 06 Jul 2026 02:32:38 -0700 (PDT) From: Jerome Brunet Date: Mon, 06 Jul 2026 11:32:14 +0200 Subject: [PATCH v4 6/9] clk: sunxi-ng: div: add read-only operation support 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: 7bit Message-Id: <20260706-a733-rtc-v4-6-f330728db3d3@baylibre.com> References: <20260706-a733-rtc-v4-0-f330728db3d3@baylibre.com> In-Reply-To: <20260706-a733-rtc-v4-0-f330728db3d3@baylibre.com> To: Junhui Liu , Alexandre Belloni , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Chen-Yu Tsai , Jernej Skrabec , Samuel Holland , Michael Turquette , Stephen Boyd , Maxime Ripard Cc: linux-rtc@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-sunxi@lists.linux.dev, linux-kernel@vger.kernel.org, linux-clk@vger.kernel.org, Jerome Brunet X-Mailer: b4 0.15.2 X-Developer-Signature: v=1; a=openpgp-sha256; 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a=openpgp; fpr=F29F26CF27BAE1A9719AE6BDC3C92AAF3E60AED9 Add support for sunxi-ng read-only dividers. This will be useful to the a733 oscillator detection logic. Reviewed-by: Chen-Yu Tsai Signed-off-by: Jerome Brunet --- drivers/clk/sunxi-ng/ccu_div.c | 42 ++++++++++++++++++++++++++++++++++++++++++ drivers/clk/sunxi-ng/ccu_div.h | 1 + drivers/clk/sunxi-ng/ccu_mux.c | 2 +- drivers/clk/sunxi-ng/ccu_mux.h | 4 ++++ 4 files changed, 48 insertions(+), 1 deletion(-) diff --git a/drivers/clk/sunxi-ng/ccu_div.c b/drivers/clk/sunxi-ng/ccu_div.c index 62d680ccb524..d1c8c7baa12d 100644 --- a/drivers/clk/sunxi-ng/ccu_div.c +++ b/drivers/clk/sunxi-ng/ccu_div.c @@ -84,6 +84,36 @@ static int ccu_div_determine_rate(struct clk_hw *hw, req, ccu_div_determine_rate_helper, cd); } +static int ccu_rodiv_determine_rate(struct clk_hw *hw, + struct clk_rate_request *req) +{ + struct ccu_div *cd = hw_to_ccu_div(hw); + unsigned long val; + u32 reg; + int ret; + + reg = readl(cd->common.base + cd->common.reg); + val = reg >> cd->div.shift; + val &= (1 << cd->div.width) - 1; + + req->rate = ccu_mux_helper_unapply_prediv(&cd->common, &cd->mux, -1, + req->rate); + + if (cd->common.features & CCU_FEATURE_FIXED_POSTDIV) + req->rate *= cd->fixed_post_div; + + ret = divider_ro_determine_rate(hw, req, cd->div.table, + cd->div.width, cd->div.flags, val); + + if (cd->common.features & CCU_FEATURE_FIXED_POSTDIV) + req->rate /= cd->fixed_post_div; + + req->rate = ccu_mux_helper_apply_prediv(&cd->common, &cd->mux, -1, + req->rate); + + return ret; +} + static int ccu_div_set_rate(struct clk_hw *hw, unsigned long rate, unsigned long parent_rate) { @@ -143,3 +173,15 @@ const struct clk_ops ccu_div_ops = { .set_rate = ccu_div_set_rate, }; EXPORT_SYMBOL_NS_GPL(ccu_div_ops, "SUNXI_CCU"); + +const struct clk_ops ccu_rodiv_ops = { + .disable = ccu_div_disable, + .enable = ccu_div_enable, + .is_enabled = ccu_div_is_enabled, + + .get_parent = ccu_div_get_parent, + + .determine_rate = ccu_rodiv_determine_rate, + .recalc_rate = ccu_div_recalc_rate, +}; +EXPORT_SYMBOL_NS_GPL(ccu_rodiv_ops, "SUNXI_CCU"); diff --git a/drivers/clk/sunxi-ng/ccu_div.h b/drivers/clk/sunxi-ng/ccu_div.h index be00b3277e97..a30a92780a05 100644 --- a/drivers/clk/sunxi-ng/ccu_div.h +++ b/drivers/clk/sunxi-ng/ccu_div.h @@ -300,5 +300,6 @@ static inline struct ccu_div *hw_to_ccu_div(struct clk_hw *hw) } extern const struct clk_ops ccu_div_ops; +extern const struct clk_ops ccu_rodiv_ops; #endif /* _CCU_DIV_H_ */ diff --git a/drivers/clk/sunxi-ng/ccu_mux.c b/drivers/clk/sunxi-ng/ccu_mux.c index 766f27cff748..775d396ccf31 100644 --- a/drivers/clk/sunxi-ng/ccu_mux.c +++ b/drivers/clk/sunxi-ng/ccu_mux.c @@ -68,7 +68,7 @@ unsigned long ccu_mux_helper_apply_prediv(struct ccu_common *common, } EXPORT_SYMBOL_NS_GPL(ccu_mux_helper_apply_prediv, "SUNXI_CCU"); -static unsigned long ccu_mux_helper_unapply_prediv(struct ccu_common *common, +unsigned long ccu_mux_helper_unapply_prediv(struct ccu_common *common, struct ccu_mux_internal *cm, int parent_index, unsigned long parent_rate) diff --git a/drivers/clk/sunxi-ng/ccu_mux.h b/drivers/clk/sunxi-ng/ccu_mux.h index c94a4bde5d01..272a2c36a8f2 100644 --- a/drivers/clk/sunxi-ng/ccu_mux.h +++ b/drivers/clk/sunxi-ng/ccu_mux.h @@ -134,6 +134,10 @@ unsigned long ccu_mux_helper_apply_prediv(struct ccu_common *common, struct ccu_mux_internal *cm, int parent_index, unsigned long parent_rate); +unsigned long ccu_mux_helper_unapply_prediv(struct ccu_common *common, + struct ccu_mux_internal *cm, + int parent_index, + unsigned long parent_rate); int ccu_mux_helper_determine_rate(struct ccu_common *common, struct ccu_mux_internal *cm, struct clk_rate_request *req, -- 2.47.3