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Wed, 24 Jan 2024 06:53:19 +0000 (GMT) Received: from epsmgms1p1new.samsung.com (unknown [182.195.42.41]) by epsmtrp1.samsung.com (KnoxPortal) with ESMTP id 20240124065319epsmtrp1f32bb73c3b9651595741bfd10bd3be1e~tNf4TOi9i2267022670epsmtrp1a; Wed, 24 Jan 2024 06:53:19 +0000 (GMT) X-AuditID: b6c32a50-c99ff70000004ba9-4f-65b0c8cfaa23 Received: from epsmtip2.samsung.com ( [182.195.34.31]) by epsmgms1p1new.samsung.com (Symantec Messaging Gateway) with SMTP id 54.55.08755.FD3B0B56; Wed, 24 Jan 2024 15:53:19 +0900 (KST) Received: from FDSFTE462 (unknown [107.122.81.248]) by epsmtip2.samsung.com (KnoxPortal) with ESMTPA id 20240124065316epsmtip2581a492f05445697e6023d189fec380a~tNf1tsIX72736927369epsmtip2K; Wed, 24 Jan 2024 06:53:16 +0000 (GMT) From: "Shradha Todi" To: "'Manivannan Sadhasivam'" Cc: , , , , , , , , , , , , , , , , In-Reply-To: <20240120150303.GB5405@thinkpad> Subject: RE: [PATCH v3 1/2] clk: Provide managed helper to get and enable bulk clocks Date: Wed, 24 Jan 2024 12:23:15 +0530 Message-ID: <05ea01da4e92$0357d310$0a077930$@samsung.com> Precedence: bulk X-Mailing-List: linux-clk@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Mailer: Microsoft Outlook 16.0 Thread-Index: AQK3Yhu837gawrdP2S3E1hwP53Jf7wFhoUR7AWI/r/kCQ7XGLK8GH1bw Content-Language: en-in X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFnrBJsWRmVeSWpSXmKPExsWy7bCmuu75ExtSDT53CFk8mLeNzWJJU4bF ii8z2S32vt7KbtHQ85vVYtPja6wWH3vusVpc3jWHzeLsvONsFjPO72OyODR1L6NFy58WFou1 R+6yW9xt6WS1uHjK1WLR1i/sFv/37GC3+HdtI4uDkMflaxeZPd7faGX32DnrLrvHgk2lHptW dbJ53Lm2h83jyZXpTB6bl9R79G1ZxejxeZNcAFdUtk1GamJKapFCal5yfkpmXrqtkndwvHO8 qZmBoa6hpYW5kkJeYm6qrZKLT4CuW2YO0EtKCmWJOaVAoYDE4mIlfTubovzSklSFjPziElul 1IKUnAKTAr3ixNzi0rx0vbzUEitDAwMjU6DChOyMOUvXMhasMKiYtn8bcwPjFPUuRk4OCQET iVMfvjOB2EICexglLu2QgLA/MUrc7zPuYuQCsr8xSkxdv4QdpuHL8pmsEIm9jBIzp3ayQzgv GCUWbZnPCFLFJqAj8eTKH2YQW0TAQaL97ScWkCJmgfvMEhd6z4Pt4xTQlbj6fRMriC0sEC7x 88pPMJtFQFVi8tb5YDavgKXEurP/WCBsQYmTM5+A2cwC2hLLFr5mhjhJQeLn02WsEMvcJJ6c bmKGqBGXOPqzhxlksYRAO6fEoQXToX5wkVhx+D0ThC0s8er4Fqi4lMTL/jYoO11i5eYZUAty JL5tXgJVby9x4MocoCM4gBZoSqzfpQ8RlpWYemodE8RePone30+gynkldsyDsZUlvvzdwwJh S0rMO3aZdQKj0iwkr81C8tosJC/MQti2gJFlFaNUakFxbnpqsmmBoW5eajk8xpPzczcxgpO8 VsAOxtUb/uodYmTiYDzEKMHBrCTCe0NyXaoQb0piZVVqUX58UWlOavEhRlNggE9klhJNzgfm mbySeEMTSwMTMzMzE0tjM0Mlcd7XrXNThATSE0tSs1NTC1KLYPqYODilGpiydTwcpogvMMz5 tF3kyNVdr9jDV35Ie9rGprsqsX/Oaw39bd7thyd/vXze01T66pJ50hKXK5f6rj278mTt2jvi i7zE2VVt63QzP977xZS4TvzS45Rdu8S+7tN/ah1rOe3wTZMbr0Or+S8qx94y0evXT57wOcz2 SdlykdIJBzx6yzRN6jWeR56LcYnu6Kxe8qvnRaNgXfkxWcdVPe6Zm/Yfdjnc1xmxMkZMtJql cnpja5raXHvfjGiF4F9cHd53rXkyVY5Wtf3lEA/mujjZ+Plr1jV225o09e5+ntESYa994E79 y868KUt+lWkfa49eUe6yZuH2Mt27khMuXk/I5DpzN2Ri9zmxyd3BT9K7OZVYijMSDbWYi4oT AZRMtxZ7BAAA X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFrrIIsWRmVeSWpSXmKPExsWy7bCSvO79zRtSDX6uYbV4MG8bm8WSpgyL FV9mslvsfb2V3aKh5zerxabH11gtPvbcY7W4vGsOm8XZecfZLGac38dkcWjqXkaLlj8tLBZr j9xlt7jb0slqcfGUq8WirV/YLf7v2cFu8e/aRhYHIY/L1y4ye7y/0crusXPWXXaPBZtKPTat 6mTzuHNtD5vHkyvTmTw2L6n36NuyitHj8ya5AK4oLpuU1JzMstQifbsErozlvf9YCxbpV5zY 8ZitgfG/ahcjJ4eEgInEl+UzWbsYuTiEBHYzSuy4+IEFIiEp8fniOiYIW1hi5b/n7BBFzxgl Dp84C5ZgE9CReHLlDzOILSLgINH+9hMLSBGzwEdmic2zf0KNvcMoseraCrAqTgFdiavfN7GC 2MICoRIXG9exgdgsAqoSk7fOB4vzClhKrDv7jwXCFpQ4OfMJmM0soC3x9OZTOHvZwtfMEOcp SPx8uowV4go3iSenm5ghasQljv7sYZ7AKDwLyahZSEbNQjJqFpKWBYwsqxglUwuKc9Nziw0L DPNSy/WKE3OLS/PS9ZLzczcxgmNdS3MH4/ZVH/QOMTJxMB5ilOBgVhLhvSG5LlWINyWxsiq1 KD++qDQntfgQozQHi5I4r/iL3hQhgfTEktTs1NSC1CKYLBMHp1QDU7eL2yuRM6dUum5fzlP4 3+9UVLD55Qr9N43s9ufX31k932J9CGN3+Bppo5Dt/gbsVYtnv7ode/FQ84KFexvmLLNW+sZ0 PqrubVyHgtusvq3rAs0CWHYKnc3tXS5flrZ6o75p40Rj2a28smmXJxxs/NHsmTthcmlPVJHd 9UeFZ1ZwBy+X37thBjd3vSRb4ZqdKb7HHRucm5/U3lzBXr69KujACsvIzGnFcz48lzAu7RSx 3b088zb3knPZZ28ECHxY+endC2n2/ezcUYKvLn27aXVshUN5tsSrp06Gq1kemFz2EJ+VdOD7 ywt7+Asyon9OYpt5cOPKOy+3z3nw/H27gejEimLvFdU7QnUjFnSLRCuxFGckGmoxFxUnAgAV H02gZAMAAA== X-CMS-MailID: 20240124065319epcas5p12681e301fd10a8da9f063f9fc1581d01 X-Msg-Generator: CA Content-Type: text/plain; charset="utf-8" X-Sendblock-Type: REQ_APPROVE CMS-TYPE: 105P DLP-Filter: Pass X-CFilter-Loop: Reflected X-CMS-RootMailID: 20240110110156epcas5p36bac4093be0fa6eaa501d7eaed4d43d3 References: <20240110110115.56270-1-shradha.t@samsung.com> <20240110110115.56270-2-shradha.t@samsung.com> <20240120150303.GB5405@thinkpad> > -----Original Message----- > From: Manivannan Sadhasivam > Sent: 20 January 2024 20:33 > To: Shradha Todi > Cc: linux-clk=40vger.kernel.org; linux-kernel=40vger.kernel.org; linux- > pci=40vger.kernel.org; linux-arm-kernel=40lists.infradead.org; linux-sams= ung- > soc=40vger.kernel.org; mturquette=40baylibre.com; sboyd=40kernel.org; > jingoohan1=40gmail.com; lpieralisi=40kernel.org; kw=40linux.com; robh=40k= ernel.org; > bhelgaas=40google.com; krzysztof.kozlowski=40linaro.org; > alim.akhtar=40samsung.com; linux=40armlinux.org.uk; > m.szyprowski=40samsung.com > Subject: Re: =5BPATCH v3 1/2=5D clk: Provide managed helper to get and en= able bulk > clocks >=20 > On Wed, Jan 10, 2024 at 04:31:14PM +0530, Shradha Todi wrote: > > Provide a managed devm_clk_bulk* wrapper to get and enable all bulk > > clocks in order to simplify drivers that keeps all clocks enabled for > > the time of driver operation. > > > > Suggested-by: Marek Szyprowski > > Signed-off-by: Shradha Todi > > --- > > drivers/clk/clk-devres.c =7C 41 > ++++++++++++++++++++++++++++++++++++++++ > > include/linux/clk.h =7C 25 ++++++++++++++++++++++++ > > 2 files changed, 66 insertions(+) > > > > diff --git a/drivers/clk/clk-devres.c b/drivers/clk/clk-devres.c index > > 4fb4fd4b06bd..05b0ff4bc1d4 100644 > > --- a/drivers/clk/clk-devres.c > > +++ b/drivers/clk/clk-devres.c > > =40=40 -102,6 +102,7 =40=40 > EXPORT_SYMBOL_GPL(devm_clk_get_optional_enabled); > > struct clk_bulk_devres =7B > > struct clk_bulk_data *clks; > > int num_clks; > > + void (*exit)(int num_clks, const struct clk_bulk_data *clks); > > =7D; > > > > static void devm_clk_bulk_release(struct device *dev, void *res) =40= =40 > > -182,6 +183,46 =40=40 int __must_check devm_clk_bulk_get_all(struct dev= ice > > *dev, =7D EXPORT_SYMBOL_GPL(devm_clk_bulk_get_all); > > > > +static void devm_clk_bulk_release_all_enabled(struct device *dev, > > +void *res) =7B > > + struct clk_bulk_devres *devres =3D res; > > + > > + if (devres->exit) > > + devres->exit(devres->num_clks, devres->clks); > > + > > + clk_bulk_put_all(devres->num_clks, devres->clks); =7D > > + > > +int __must_check devm_clk_bulk_get_all_enabled(struct device *dev, > > + struct clk_bulk_data **clks, int *num_clks) >=20 > What is the user supposed to do with =22num_clks=22 when you are already = handling > the enable part? >=20 Since the initial clk_bulk_get_all was returning the num_clks value, the th= ought was to maintain this as the user might want to have a check in their driver whether x number of = clocks were successfully retrieved and enabled. > > +=7B > > + struct clk_bulk_devres *devres; > > + int ret; > > + > > + devres =3D devres_alloc(devm_clk_bulk_release_all_enabled, > > + sizeof(*devres), GFP_KERNEL); > > + if (=21devres) > > + return -ENOMEM; > > + > > + ret =3D clk_bulk_get_all(dev, &devres->clks); > > + if (ret > 0) =7B > > + *clks =3D devres->clks; > > + devres->num_clks =3D ret; > > + *num_clks =3D ret; > > + devres_add(dev, devres); >=20 > If you move the statements inside this condition to the end of this funct= ion, you > could get rid of the exit() callback and directly use > clk_bulk_disable_unprepare() in devm_clk_bulk_release_all_enabled(). >=20 Okay=21 I will change this in the next patchset as suggested > > + =7D else =7B > > + devres_free(devres); > > + return ret; > > + =7D > > + > > + ret =3D clk_bulk_prepare_enable(devres->num_clks, *clks); > > + if (=21ret) > > + devres->exit =3D clk_bulk_disable_unprepare; >=20 > Here you can just do clk_bulk_put_all() and devres_free() directly becaus= e you > know that the driver won't proceed after this error. >=20 > - Mani >=20 Thanks for the review, Mani. Will change this as suggested=21 > > + > > + return ret; > > +=7D > > +EXPORT_SYMBOL_GPL(devm_clk_bulk_get_all_enabled); > > + > > static int devm_clk_match(struct device *dev, void *res, void *data) > > =7B > > struct clk **c =3D res; > > diff --git a/include/linux/clk.h b/include/linux/clk.h index > > 1ef013324237..bf3e9bee5754 100644 > > --- a/include/linux/clk.h > > +++ b/include/linux/clk.h > > =40=40 -438,6 +438,24 =40=40 int __must_check > > devm_clk_bulk_get_optional(struct device *dev, int num_clks, int > __must_check devm_clk_bulk_get_all(struct device *dev, > > struct clk_bulk_data **clks); > > > > +/** > > + * devm_clk_bulk_get_all_enabled - managed get multiple clk consumers = and > > + * enable all clk > > + * =40dev: device for clock =22consumer=22 > > + * =40clks: pointer to the clk_bulk_data table of consumer > > + * =40num_clks: out parameter to store the number of clk_bulk_data > > + * > > + * Returns success (0) or negative errno. > > + * > > + * This helper function allows drivers to get several clk > > + * consumers and enable all of them in one operation with management. > > + * The clks will automatically be disabled and freed when the device > > + * is unbound. > > + */ > > + > > +int __must_check devm_clk_bulk_get_all_enabled(struct device *dev, > > + struct clk_bulk_data **clks, int *num_clks); > > + > > /** > > * devm_clk_get - lookup and obtain a managed reference to a clock pro= ducer. > > * =40dev: device for clock =22consumer=22 > > =40=40 -960,6 +978,13 =40=40 static inline int __must_check > devm_clk_bulk_get_all(struct device *dev, > > return 0; > > =7D > > > > +static inline int __must_check devm_clk_bulk_get_all_enabled(struct de= vice > *dev, > > + struct clk_bulk_data **clks, int *num_clks) =7B > > + > > + return 0; > > +=7D > > + > > static inline struct clk *devm_get_clk_from_child(struct device *dev, > > struct device_node *np, const char *con_id) =7B > > -- > > 2.17.1 > > >=20 > -- > 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