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Wed, 25 Jun 2025 14:48:39 +0200 (CEST) Message-ID: Date: Wed, 25 Jun 2025 14:48:39 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 09/29] dt-bindings: clock: mediatek: Describe MT8196 peripheral clock controllers To: Krzysztof Kozlowski , Laura Nao , mturquette@baylibre.com, sboyd@kernel.org, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, matthias.bgg@gmail.com, p.zabel@pengutronix.de, richardcochran@gmail.com Cc: guangjie.song@mediatek.com, wenst@chromium.org, linux-clk@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, netdev@vger.kernel.org, kernel@collabora.com References: <20250624143220.244549-1-laura.nao@collabora.com> <20250624143220.244549-10-laura.nao@collabora.com> <7dfba01a-6ede-44c2-87e3-3ecb439b48e3@kernel.org> <284a4ee5-806b-45f9-8d57-d02ec291e389@collabora.com> <0870a2ba-936b-4eb2-a570-f2c9dea471b8@kernel.org> <9fc32523-5009-4f48-8d82-6c3fd285801d@collabora.com> <86654ad1-a2ab-4add-b9de-4d56c67f377b@kernel.org> From: AngeloGioacchino Del Regno Content-Language: en-US In-Reply-To: <86654ad1-a2ab-4add-b9de-4d56c67f377b@kernel.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250625_054842_522215_677C0D85 X-CRM114-Status: GOOD ( 21.34 ) X-BeenThere: linux-mediatek@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "Linux-mediatek" Errors-To: linux-mediatek-bounces+linux-mediatek=archiver.kernel.org@lists.infradead.org Il 25/06/25 13:06, Krzysztof Kozlowski ha scritto: > On 25/06/2025 11:45, AngeloGioacchino Del Regno wrote: >> Il 25/06/25 10:57, Krzysztof Kozlowski ha scritto: >>> On 25/06/2025 10:20, AngeloGioacchino Del Regno wrote: >>>> Il 24/06/25 18:02, Krzysztof Kozlowski ha scritto: >>>>> On 24/06/2025 16:32, Laura Nao wrote: >>>>>> + '#reset-cells': >>>>>> + const: 1 >>>>>> + description: >>>>>> + Reset lines for PEXTP0/1 and UFS blocks. >>>>>> + >>>>>> + mediatek,hardware-voter: >>>>>> + $ref: /schemas/types.yaml#/definitions/phandle >>>>>> + description: >>>>>> + On the MT8196 SoC, a Hardware Voter (HWV) backed by a fixed-function >>>>>> + MCU manages clock and power domain control across the AP and other >>>>>> + remote processors. By aggregating their votes, it ensures clocks are >>>>>> + safely enabled/disabled and power domains are active before register >>>>>> + access. >>>>> >>>>> Resource voting is not via any phandle, but either interconnects or >>>>> required opps for power domain. >>>> >>>> Sorry, I'm not sure who is actually misunderstanding what, here... let me try to >>>> explain the situation: >>>> >>>> This is effectively used as a syscon - as in, the clock controllers need to perform >>>> MMIO R/W on both the clock controller itself *and* has to place a vote to the clock >>>> controller specific HWV register. >>> >>> syscon is not the interface to place a vote for clocks. "clocks" >>> property is. >>> >>>> >>>> This is done for MUX-GATE and GATE clocks, other than for power domains. >>>> >>>> Note that the HWV system is inside of the power domains controller, and it's split >>>> on a per hardware macro-block basis (as per usual MediaTek hardware layout...). >>>> >>>> The HWV, therefore, does *not* vote for clock *rates* (so, modeling OPPs would be >>>> a software quirk, I think?), does *not* manage bandwidth (and interconnect is for >>>> voting BW only?), and is just a "switch to flip". >>> >>> That's still clocks. Gate is a clock. >>> >>>> >>>> Is this happening because the description has to be improved and creating some >>>> misunderstanding, or is it because we are underestimating and/or ignoring something >>>> here? >>>> >>> >>> Other vendors, at least qcom, represent it properly - clocks. Sometimes >>> they mix up and represent it as power domains, but that's because >>> downstream is a mess and because we actually (at upstream) don't really >>> know what is inside there - is it a clock or power domain. >>> >> >> ....but the hardware voter cannot be represented as a clock, because you use it >> for clocks *or* power domains (but at the same time, and of course in different >> drivers, and in different *intertwined* registers). > > BTW: > > git grep mediatek,hardware-voter > 0 results > > so I do not accept explanation that you use it in different drivers. Now > is the first time this is being upstream, so now is the time when this > is shaped. I was simply trying to explain how I'm using it in the current design and nothing else; and I am happy to understand what other solution could there be for this and if there's anything cleaner. You see what I do, and I'm *sure* that you definitely know that my goal is *not* to just tick yet another box, but to make things right, - and with the best possible shape and, especially, community agreement. Cheers, Angelo