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[75.72.117.212]) by smtp.gmail.com with ESMTPSA id af79cd13be357-8c37f51b732sm173883085a.25.2026.01.06.06.43.54 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 06 Jan 2026 06:43:55 -0800 (PST) Message-ID: Date: Tue, 6 Jan 2026 08:43:54 -0600 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 2/4] clk: spacemit: extract common ccu functions To: Yixun Lan , Stephen Boyd , Michael Turquette , Philipp Zabel Cc: Guodong Xu , Inochi Amaoto , linux-kernel@vger.kernel.org, linux-clk@vger.kernel.org, linux-riscv@lists.infradead.org, spacemit@lists.linux.dev, Yao Zi References: <20260103-06-k1-clk-common-v3-0-6061d9f69eef@gentoo.org> <20260103-06-k1-clk-common-v3-2-6061d9f69eef@gentoo.org> Content-Language: en-US From: Alex Elder In-Reply-To: <20260103-06-k1-clk-common-v3-2-6061d9f69eef@gentoo.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260106_064357_578336_277C3BCF X-CRM114-Status: GOOD ( 33.03 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org On 1/3/26 1:26 AM, Yixun Lan wrote: > Refactor the probe function of SpacemiT's clock, and extract a common ccu > file, so new clock driver added in the future can share the same code, > which would lower the burden of maintenance. Since this commit changes the > module name where the auxiliary device registered, the auxiliary device id > need to be adjusted. Idea of the patch comes from the review of K3 clock > driver, please refer to this disucssion[1] for more detail. Are all of the hunks of moved code moved without change (I think so)? If so I think it's worth mentioning that. If not, you should explain whatever differs, and why. (I would expect the only thing that would have to change is making spacemit_ccu_probe() public.) I made one minor comment below. I didn't verify, but I assume this is all just moving the code around, and based on that: Reviewed-by: Alex Elder > Link: https://lore.kernel.org/all/aTo8sCPpVM1o9PKX@pie/ [1] > Suggested-by: Yao Zi > Signed-off-by: Yixun Lan > --- > drivers/clk/spacemit/ccu-k1.c | 179 ++------------------------------------ > drivers/clk/spacemit/ccu_common.c | 171 ++++++++++++++++++++++++++++++++++++ > drivers/clk/spacemit/ccu_common.h | 10 +++ > 3 files changed, 186 insertions(+), 174 deletions(-) > > diff --git a/drivers/clk/spacemit/ccu-k1.c b/drivers/clk/spacemit/ccu-k1.c > index 01d9485b615d..02c792a73759 100644 > --- a/drivers/clk/spacemit/ccu-k1.c > +++ b/drivers/clk/spacemit/ccu-k1.c > @@ -5,15 +5,10 @@ > */ > > #include > -#include > #include > -#include > -#include > -#include > #include > #include > #include > -#include > #include > > #include "ccu_common.h" > @@ -23,14 +18,6 @@ > > #include > > -struct spacemit_ccu_data { > - const char *reset_name; > - struct clk_hw **hws; > - size_t num; > -}; > - > -static DEFINE_IDA(auxiliary_ids); > - > /* APBS clocks start, APBS region contains and only contains all PLL clocks */ > > /* > @@ -1001,167 +988,6 @@ static const struct spacemit_ccu_data k1_ccu_apbc2_data = { > .reset_name = "apbc2-reset", > }; > > -static int spacemit_ccu_register(struct device *dev, > - struct regmap *regmap, > - struct regmap *lock_regmap, > - const struct spacemit_ccu_data *data) > -{ > - struct clk_hw_onecell_data *clk_data; > - int i, ret; > - > - /* Nothing to do if the CCU does not implement any clocks */ > - if (!data->hws) > - return 0; > - > - clk_data = devm_kzalloc(dev, struct_size(clk_data, hws, data->num), > - GFP_KERNEL); > - if (!clk_data) > - return -ENOMEM; > - > - clk_data->num = data->num; > - > - for (i = 0; i < data->num; i++) { > - struct clk_hw *hw = data->hws[i]; > - struct ccu_common *common; > - const char *name; > - > - if (!hw) { > - clk_data->hws[i] = ERR_PTR(-ENOENT); > - continue; > - } > - > - name = hw->init->name; > - > - common = hw_to_ccu_common(hw); > - common->regmap = regmap; > - common->lock_regmap = lock_regmap; > - > - ret = devm_clk_hw_register(dev, hw); > - if (ret) { > - dev_err(dev, "Cannot register clock %d - %s\n", > - i, name); > - return ret; > - } > - > - clk_data->hws[i] = hw; > - } > - > - ret = devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get, clk_data); > - if (ret) > - dev_err(dev, "failed to add clock hardware provider (%d)\n", ret); > - > - return ret; > -} > - > -static void spacemit_cadev_release(struct device *dev) > -{ > - struct auxiliary_device *adev = to_auxiliary_dev(dev); > - > - ida_free(&auxiliary_ids, adev->id); > - kfree(to_spacemit_ccu_adev(adev)); > -} > - > -static void spacemit_adev_unregister(void *data) > -{ > - struct auxiliary_device *adev = data; > - > - auxiliary_device_delete(adev); > - auxiliary_device_uninit(adev); > -} > - > -static int spacemit_ccu_reset_register(struct device *dev, > - struct regmap *regmap, > - const char *reset_name) > -{ > - struct spacemit_ccu_adev *cadev; > - struct auxiliary_device *adev; > - int ret; > - > - /* Nothing to do if the CCU does not implement a reset controller */ > - if (!reset_name) > - return 0; > - > - cadev = kzalloc(sizeof(*cadev), GFP_KERNEL); > - if (!cadev) > - return -ENOMEM; > - > - cadev->regmap = regmap; > - > - adev = &cadev->adev; > - adev->name = reset_name; > - adev->dev.parent = dev; > - adev->dev.release = spacemit_cadev_release; > - adev->dev.of_node = dev->of_node; > - ret = ida_alloc(&auxiliary_ids, GFP_KERNEL); > - if (ret < 0) > - goto err_free_cadev; > - adev->id = ret; > - > - ret = auxiliary_device_init(adev); > - if (ret) > - goto err_free_aux_id; > - > - ret = auxiliary_device_add(adev); > - if (ret) { > - auxiliary_device_uninit(adev); > - return ret; > - } > - > - return devm_add_action_or_reset(dev, spacemit_adev_unregister, adev); > - > -err_free_aux_id: > - ida_free(&auxiliary_ids, adev->id); > -err_free_cadev: > - kfree(cadev); > - > - return ret; > -} > - > -static int k1_ccu_probe(struct platform_device *pdev) > -{ > - struct regmap *base_regmap, *lock_regmap = NULL; > - const struct spacemit_ccu_data *data; > - struct device *dev = &pdev->dev; > - int ret; > - > - base_regmap = device_node_to_regmap(dev->of_node); > - if (IS_ERR(base_regmap)) > - return dev_err_probe(dev, PTR_ERR(base_regmap), > - "failed to get regmap\n"); > - > - /* > - * The lock status of PLLs locate in MPMU region, while PLLs themselves > - * are in APBS region. Reference to MPMU syscon is required to check PLL > - * status. > - */ > - if (of_device_is_compatible(dev->of_node, "spacemit,k1-pll")) { > - struct device_node *mpmu = of_parse_phandle(dev->of_node, > - "spacemit,mpmu", 0); > - if (!mpmu) > - return dev_err_probe(dev, -ENODEV, > - "Cannot parse MPMU region\n"); > - > - lock_regmap = device_node_to_regmap(mpmu); > - of_node_put(mpmu); > - > - if (IS_ERR(lock_regmap)) > - return dev_err_probe(dev, PTR_ERR(lock_regmap), > - "failed to get lock regmap\n"); > - } > - > - data = of_device_get_match_data(dev); > - > - ret = spacemit_ccu_register(dev, base_regmap, lock_regmap, data); > - if (ret) > - return dev_err_probe(dev, ret, "failed to register clocks\n"); > - > - ret = spacemit_ccu_reset_register(dev, base_regmap, data->reset_name); > - if (ret) > - return dev_err_probe(dev, ret, "failed to register resets\n"); > - > - return 0; > -} > - > static const struct of_device_id of_k1_ccu_match[] = { > { > .compatible = "spacemit,k1-pll", > @@ -1195,6 +1021,11 @@ static const struct of_device_id of_k1_ccu_match[] = { > }; > MODULE_DEVICE_TABLE(of, of_k1_ccu_match); > > +static int k1_ccu_probe(struct platform_device *pdev) > +{ > + return spacemit_ccu_probe(pdev, "spacemit,k1-pll"); > +} > + > static struct platform_driver k1_ccu_driver = { > .driver = { > .name = "spacemit,k1-ccu", > diff --git a/drivers/clk/spacemit/ccu_common.c b/drivers/clk/spacemit/ccu_common.c > index 4412c4104dab..5f05b17f8452 100644 > --- a/drivers/clk/spacemit/ccu_common.c > +++ b/drivers/clk/spacemit/ccu_common.c > @@ -1,6 +1,177 @@ > // SPDX-License-Identifier: GPL-2.0-only > > +#include > +#include > +#include > #include > +#include > +#include > +#include > + > +#include "ccu_common.h" > + > +static DEFINE_IDA(auxiliary_ids); I'd insert a space here to make the definition above stand out a bit more. > +static int spacemit_ccu_register(struct device *dev, > + struct regmap *regmap, > + struct regmap *lock_regmap, > + const struct spacemit_ccu_data *data) > +{ > + struct clk_hw_onecell_data *clk_data; > + int i, ret; > + > + /* Nothing to do if the CCU does not implement any clocks */ > + if (!data->hws) > + return 0; > + > + clk_data = devm_kzalloc(dev, struct_size(clk_data, hws, data->num), > + GFP_KERNEL); > + if (!clk_data) > + return -ENOMEM; > + > + clk_data->num = data->num; > + > + for (i = 0; i < data->num; i++) { > + struct clk_hw *hw = data->hws[i]; > + struct ccu_common *common; > + const char *name; > + > + if (!hw) { > + clk_data->hws[i] = ERR_PTR(-ENOENT); > + continue; > + } > + > + name = hw->init->name; > + > + common = hw_to_ccu_common(hw); > + common->regmap = regmap; > + common->lock_regmap = lock_regmap; > + > + ret = devm_clk_hw_register(dev, hw); > + if (ret) { > + dev_err(dev, "Cannot register clock %d - %s\n", > + i, name); > + return ret; > + } > + > + clk_data->hws[i] = hw; > + } > + > + ret = devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get, clk_data); > + if (ret) > + dev_err(dev, "failed to add clock hardware provider (%d)\n", ret); > + > + return ret; > +} > + > +static void spacemit_cadev_release(struct device *dev) > +{ > + struct auxiliary_device *adev = to_auxiliary_dev(dev); > + > + ida_free(&auxiliary_ids, adev->id); > + kfree(to_spacemit_ccu_adev(adev)); > +} > + > +static void spacemit_adev_unregister(void *data) > +{ > + struct auxiliary_device *adev = data; > + > + auxiliary_device_delete(adev); > + auxiliary_device_uninit(adev); > +} > + > +static int spacemit_ccu_reset_register(struct device *dev, > + struct regmap *regmap, > + const char *reset_name) > +{ > + struct spacemit_ccu_adev *cadev; > + struct auxiliary_device *adev; > + int ret; > + > + /* Nothing to do if the CCU does not implement a reset controller */ > + if (!reset_name) > + return 0; > + > + cadev = kzalloc(sizeof(*cadev), GFP_KERNEL); > + if (!cadev) > + return -ENOMEM; > + > + cadev->regmap = regmap; > + > + adev = &cadev->adev; > + adev->name = reset_name; > + adev->dev.parent = dev; > + adev->dev.release = spacemit_cadev_release; > + adev->dev.of_node = dev->of_node; > + ret = ida_alloc(&auxiliary_ids, GFP_KERNEL); > + if (ret < 0) > + goto err_free_cadev; > + adev->id = ret; > + > + ret = auxiliary_device_init(adev); > + if (ret) > + goto err_free_aux_id; > + > + ret = auxiliary_device_add(adev); > + if (ret) { > + auxiliary_device_uninit(adev); > + return ret; > + } > + > + return devm_add_action_or_reset(dev, spacemit_adev_unregister, adev); > + > +err_free_aux_id: > + ida_free(&auxiliary_ids, adev->id); > +err_free_cadev: > + kfree(cadev); > + > + return ret; > +} > + > +int spacemit_ccu_probe(struct platform_device *pdev, const char *compat) > +{ > + struct regmap *base_regmap, *lock_regmap = NULL; > + const struct spacemit_ccu_data *data; > + struct device *dev = &pdev->dev; > + int ret; > + > + base_regmap = device_node_to_regmap(dev->of_node); > + if (IS_ERR(base_regmap)) > + return dev_err_probe(dev, PTR_ERR(base_regmap), > + "failed to get regmap\n"); > + > + /* > + * The lock status of PLLs locate in MPMU region, while PLLs themselves > + * are in APBS region. Reference to MPMU syscon is required to check PLL > + * status. > + */ > + if (compat && of_device_is_compatible(dev->of_node, compat)) { > + struct device_node *mpmu = of_parse_phandle(dev->of_node, > + "spacemit,mpmu", 0); > + if (!mpmu) > + return dev_err_probe(dev, -ENODEV, > + "Cannot parse MPMU region\n"); > + > + lock_regmap = device_node_to_regmap(mpmu); > + of_node_put(mpmu); > + > + if (IS_ERR(lock_regmap)) > + return dev_err_probe(dev, PTR_ERR(lock_regmap), > + "failed to get lock regmap\n"); > + } > + > + data = of_device_get_match_data(dev); > + > + ret = spacemit_ccu_register(dev, base_regmap, lock_regmap, data); > + if (ret) > + return dev_err_probe(dev, ret, "failed to register clocks\n"); > + > + ret = spacemit_ccu_reset_register(dev, base_regmap, data->reset_name); > + if (ret) > + return dev_err_probe(dev, ret, "failed to register resets\n"); > + > + return 0; > +} > +EXPORT_SYMBOL_NS_GPL(spacemit_ccu_probe, "CLK_SPACEMIT"); > > MODULE_DESCRIPTION("SpacemiT CCU common clock driver"); > MODULE_LICENSE("GPL"); > diff --git a/drivers/clk/spacemit/ccu_common.h b/drivers/clk/spacemit/ccu_common.h > index da72f3836e0b..7ae244b5eace 100644 > --- a/drivers/clk/spacemit/ccu_common.h > +++ b/drivers/clk/spacemit/ccu_common.h > @@ -7,6 +7,8 @@ > #ifndef _CCU_COMMON_H_ > #define _CCU_COMMON_H_ > > +#include > +#include > #include > > struct ccu_common { > @@ -36,6 +38,12 @@ static inline struct ccu_common *hw_to_ccu_common(struct clk_hw *hw) > return container_of(hw, struct ccu_common, hw); > } > > +struct spacemit_ccu_data { > + const char *reset_name; > + struct clk_hw **hws; > + size_t num; > +}; > + > #define ccu_read(c, reg) \ > ({ \ > u32 tmp; \ > @@ -45,4 +53,6 @@ static inline struct ccu_common *hw_to_ccu_common(struct clk_hw *hw) > #define ccu_update(c, reg, mask, val) \ > regmap_update_bits((c)->regmap, (c)->reg_##reg, mask, val) > > +int spacemit_ccu_probe(struct platform_device *pdev, const char *compat); > + > #endif /* _CCU_COMMON_H_ */ > _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv