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[73.183.52.120]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-8971cd8aff6sm174993256d6.27.2026.02.17.16.35.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 17 Feb 2026 16:35:11 -0800 (PST) Date: Tue, 17 Feb 2026 19:35:09 -0500 From: Brian Masney To: Anirudh Srinivasan Cc: Drew Fustini , Joel Stanley , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Michael Turquette , Stephen Boyd , Philipp Zabel , linux-riscv@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-clk@vger.kernel.org, joel@jms.id.au, fustini@kernel.org, mpe@kernel.org, mpe@oss.tenstorrent.com, npiggin@oss.tenstorrent.com, agross@kernel.org, agross@oss.tenstorrent.com Subject: Re: [PATCH v6 3/3] clk: tenstorrent: Add Atlantis clock controller driver Message-ID: References: <20260216-atlantis-clocks-v6-0-cb46d6a59c73@oss.tenstorrent.com> <20260216-atlantis-clocks-v6-3-cb46d6a59c73@oss.tenstorrent.com> Precedence: bulk X-Mailing-List: linux-clk@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: User-Agent: Mutt/2.2.14 (2025-02-20) On Tue, Feb 17, 2026 at 05:29:56PM -0600, Anirudh Srinivasan wrote: > Hi Brian, > > On Tue, Feb 17, 2026 at 5:22 PM Brian Masney wrote: > > > > > > We have a group of gate clocks that have a single enable bit shared > > > among them (instead of individual enable bits for each clock). We need > > > to keep track of the number of clocks within a group that have > > > requested an enable, and only unset the bit if all the clocks are > > > disabled. share_count is used to keep track of this. It gets updated > > > by each clock. Hence it's a pointer (and the mutexes around access to > > > it). > > > > The code currently has: > > > > struct atlantis_clk_gate_shared_config { > > ... > > unsigned int *share_count; > > } > > > > That pointer is dereferenced like this in several places: > > > > need_enable = (*gate->config.share_count)++ == 0; > > > > I don't see why the pointer is needed. Can you drop the pointer > > and the dereference like this? > > > > struct atlantis_clk_gate_shared_config { > > ... > > unsigned int share_count; > > } > > > > need_enable = gate->config.share_count++ == 0; > > > > In this case, wouldn't each atlantis_clk_gate_shared end up getting > its own copy of share_count? Which is not what we want. Or maybe I'm > not quite understanding what you're saying. > > Every time we create a group of these shared gate clks, we create a > refcnt variable like this and pass the var to all clks that share it. OK, I see now. Thanks for the explanation. 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[73.183.52.120]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-8971cd8aff6sm174993256d6.27.2026.02.17.16.35.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 17 Feb 2026 16:35:11 -0800 (PST) Date: Tue, 17 Feb 2026 19:35:09 -0500 From: Brian Masney To: Anirudh Srinivasan Cc: Drew Fustini , Joel Stanley , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Michael Turquette , Stephen Boyd , Philipp Zabel , linux-riscv@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-clk@vger.kernel.org, joel@jms.id.au, fustini@kernel.org, mpe@kernel.org, mpe@oss.tenstorrent.com, npiggin@oss.tenstorrent.com, agross@kernel.org, agross@oss.tenstorrent.com Subject: Re: [PATCH v6 3/3] clk: tenstorrent: Add Atlantis clock controller driver Message-ID: References: <20260216-atlantis-clocks-v6-0-cb46d6a59c73@oss.tenstorrent.com> <20260216-atlantis-clocks-v6-3-cb46d6a59c73@oss.tenstorrent.com> MIME-Version: 1.0 In-Reply-To: User-Agent: Mutt/2.2.14 (2025-02-20) X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: fwphDbrr-onyzfjKrz0tJlg56Sz4t4vBWjJBhrJyZFQ_1771374912 X-Mimecast-Originator: redhat.com Content-Disposition: inline X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260217_163516_132939_2E07A713 X-CRM114-Status: GOOD ( 23.09 ) 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-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org T24gVHVlLCBGZWIgMTcsIDIwMjYgYXQgMDU6Mjk6NTZQTSAtMDYwMCwgQW5pcnVkaCBTcmluaXZh c2FuIHdyb3RlOgo+IEhpIEJyaWFuLAo+IAo+IE9uIFR1ZSwgRmViIDE3LCAyMDI2IGF0IDU6MjLi gK9QTSBCcmlhbiBNYXNuZXkgPGJtYXNuZXlAcmVkaGF0LmNvbT4gd3JvdGU6Cj4gPiA+Cj4gPiA+ IFdlIGhhdmUgYSBncm91cCBvZiBnYXRlIGNsb2NrcyB0aGF0IGhhdmUgYSBzaW5nbGUgZW5hYmxl IGJpdCBzaGFyZWQKPiA+ID4gYW1vbmcgdGhlbSAoaW5zdGVhZCBvZiBpbmRpdmlkdWFsIGVuYWJs ZSBiaXRzIGZvciBlYWNoIGNsb2NrKS4gV2UgbmVlZAo+ID4gPiB0byBrZWVwIHRyYWNrIG9mIHRo ZSBudW1iZXIgb2YgY2xvY2tzIHdpdGhpbiBhIGdyb3VwIHRoYXQgaGF2ZQo+ID4gPiByZXF1ZXN0 ZWQgYW4gZW5hYmxlLCBhbmQgb25seSB1bnNldCB0aGUgYml0IGlmIGFsbCB0aGUgY2xvY2tzIGFy ZQo+ID4gPiBkaXNhYmxlZC4gc2hhcmVfY291bnQgaXMgdXNlZCB0byBrZWVwIHRyYWNrIG9mIHRo aXMuIEl0IGdldHMgdXBkYXRlZAo+ID4gPiBieSBlYWNoIGNsb2NrLiBIZW5jZSBpdCdzIGEgcG9p bnRlciAoYW5kIHRoZSBtdXRleGVzIGFyb3VuZCBhY2Nlc3MgdG8KPiA+ID4gaXQpLgo+ID4KPiA+ IFRoZSBjb2RlIGN1cnJlbnRseSBoYXM6Cj4gPgo+ID4gc3RydWN0IGF0bGFudGlzX2Nsa19nYXRl X3NoYXJlZF9jb25maWcgewo+ID4gICAgICAgICAuLi4KPiA+ICAgICAgICAgdW5zaWduZWQgaW50 ICpzaGFyZV9jb3VudDsKPiA+IH0KPiA+Cj4gPiBUaGF0IHBvaW50ZXIgaXMgZGVyZWZlcmVuY2Vk IGxpa2UgdGhpcyBpbiBzZXZlcmFsIHBsYWNlczoKPiA+Cj4gPiAgICAgbmVlZF9lbmFibGUgPSAo KmdhdGUtPmNvbmZpZy5zaGFyZV9jb3VudCkrKyA9PSAwOwo+ID4KPiA+IEkgZG9uJ3Qgc2VlIHdo eSB0aGUgcG9pbnRlciBpcyBuZWVkZWQuIENhbiB5b3UgZHJvcCB0aGUgcG9pbnRlcgo+ID4gYW5k IHRoZSBkZXJlZmVyZW5jZSBsaWtlIHRoaXM/Cj4gPgo+ID4gc3RydWN0IGF0bGFudGlzX2Nsa19n YXRlX3NoYXJlZF9jb25maWcgewo+ID4gICAgICAgICAuLi4KPiA+ICAgICAgICAgdW5zaWduZWQg aW50IHNoYXJlX2NvdW50Owo+ID4gfQo+ID4KPiA+ICAgICBuZWVkX2VuYWJsZSA9IGdhdGUtPmNv bmZpZy5zaGFyZV9jb3VudCsrID09IDA7Cj4gPgo+IAo+IEluIHRoaXMgY2FzZSwgd291bGRuJ3Qg ZWFjaCBhdGxhbnRpc19jbGtfZ2F0ZV9zaGFyZWQgZW5kIHVwIGdldHRpbmcKPiBpdHMgb3duIGNv cHkgb2Ygc2hhcmVfY291bnQ/IFdoaWNoIGlzIG5vdCB3aGF0IHdlIHdhbnQuIE9yIG1heWJlIEkn bQo+IG5vdCBxdWl0ZSB1bmRlcnN0YW5kaW5nIHdoYXQgeW91J3JlIHNheWluZy4KPiAKPiBFdmVy eSB0aW1lIHdlIGNyZWF0ZSBhIGdyb3VwIG9mIHRoZXNlIHNoYXJlZCBnYXRlIGNsa3MsIHdlIGNy ZWF0ZSBhCj4gcmVmY250IHZhcmlhYmxlIGxpa2UgdGhpcyBhbmQgcGFzcyB0aGUgdmFyIHRvIGFs bCBjbGtzIHRoYXQgc2hhcmUgaXQuCgpPSywgSSBzZWUgbm93LiBUaGFua3MgZm9yIHRoZSBleHBs YW5hdGlvbi4KCkJyaWFuCgoKX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX18KbGludXgtcmlzY3YgbWFpbGluZyBsaXN0CmxpbnV4LXJpc2N2QGxpc3RzLmluZnJh ZGVhZC5vcmcKaHR0cDovL2xpc3RzLmluZnJhZGVhZC5vcmcvbWFpbG1hbi9saXN0aW5mby9saW51 eC1yaXNjdgo=