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charset=us-ascii Content-Disposition: inline In-Reply-To: X-GND-State: clean X-GND-Score: -100 X-GND-Cause: gggruggvucftvghtrhhoucdtuddrgeefvddrtddtgdekjeejvdcutefuodetggdotefrodftvfcurfhrohhfihhlvgemucfitefpfffkpdcuggftfghnshhusghstghrihgsvgenuceurghilhhouhhtmecufedtudenucesvcftvggtihhpihgvnhhtshculddquddttddmnecujfgurhepfffhvfevuffkfhggtggujgesthdtredttddtvdenucfhrhhomheptehlvgigrghnughrvgcuuegvlhhlohhnihcuoegrlhgvgigrnhgurhgvrdgsvghllhhonhhisegsohhothhlihhnrdgtohhmqeenucggtffrrghtthgvrhhnpeegieduueethefhkeegjeevfefhiedujeeuhffgleejgfejgeekueejuefgheeggfenucffohhmrghinhepsghoohhtlhhinhdrtghomhenucfkphepvdgrtddumegtsgdugeemheehieemjegrtddtmegukeejvgemudgsudgsmeeltdekgeemtggtfhgtnecuvehluhhsthgvrhfuihiivgeptdenucfrrghrrghmpehinhgvthepvdgrtddumegtsgdugeemheehieemjegrtddtmegukeejvgemudgsudgsmeeltdekgeemtggtfhgtpdhhvghloheplhhotggrlhhhohhsthdpmhgrihhlfhhrohhmpegrlhgvgigrnhgurhgvrdgsvghllhhonhhisegsohhothhlihhnrdgtohhmpdhnsggprhgtphhtthhopeduuddprhgtphhtthhopeifsghgsehkvghrnhgvlhdrohhrghdprhgtphhtthhopehkrghmvghlrdgsohhuhhgrrhgrsegsohhothhlihhnrdgtohhmpdhrtghpthhtoheptghsohhkrghsr dgsvghntggvsehprhholhgrnhdrhhhupdhrtghpthhtoheplhhinhhugidqrghrmhdqkhgvrhhnvghlsehlihhsthhsrdhinhhfrhgruggvrggurdhorhhgpdhrtghpthhtoheplhhinhhugidqihhiohesvhhgvghrrdhkvghrnhgvlhdrohhrghdprhgtphhtthhopehlihhnuhigqdhkvghrnhgvlhesvhhgvghrrdhkvghrnhgvlhdrohhrghdprhgtphhtthhopeffhhgrrhhmrgdrueesmhhitghrohgthhhiphdrtghomhdprhgtphhtthhopehluhguohhvihgtrdguvghsrhhotghhvghssehmihgtrhhotghhihhprdgtohhm X-GND-Sasl: alexandre.belloni@bootlin.com X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250227_063733_445420_96224CCE X-CRM114-Status: GOOD ( 27.86 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Kamel Bouhara , Jonathan Cameron , linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org, Dharma.B@microchip.com, Ludovic Desroches , =?iso-8859-1?B?Q3Pza+Fz?= Bence , Thomas Petazzoni , linux-arm-kernel@lists.infradead.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 27/02/2025 23:22:36+0900, William Breathitt Gray wrote: > On Thu, Feb 27, 2025 at 02:53:30PM +0100, Kamel Bouhara wrote: > > On Thu, Feb 27, 2025 at 01:59:57PM +0900, William Breathitt Gray wrote: > > > Let me make sure I understand the situation correctly. This SoC has two > > > Timer Counter Blocks (TCB) and each TCB has three Timer Counter Channels > > > (TCC); each TCC has a Counter Value (CV) and three general registers > > > (RA, RB, RC); RA and RB can store Captures, and RC can be used for > > > Compare operations. > > > > > > If that is true, then the correct way for this hardware to be exposed is > > > to have each TCB be a Counter device where each TCC is exposed as a > > > Count. So for this SoC: two Counter devices as counter0 and counter1; > > > count0, count1, and count2 as the three TCC; i.e. counter0/count{0,1,2} > > > and counter1/count{0,1,2}. > > [...] > > > > Kamel, what would it take for us to rectify this situation so that the > > > TCC are organized together by TCB under the same Counter devices? > > > > Hello, > > > > Indeed, each TCC operates independently except when quadrature mode is > > enabled. I assume this approach was taken to provide more flexibility by > > exposing them separately. > > > > Currently only one channel is configured this would need to rework the > > driver to make the 3 TCCs exposed. > > > > Greetings, > > Kamel > > Skimming through the driver, it looks like what we'll need is for > mchp_tc_counts[] to have all three TCCs defined, then have > mchp_tc_probe() match on a TCB node and configure each TCC. Once that's > setup, then whenever we need to identify which TCC a callback is > exposing, we can get it from count->id. > > So for example, the TC_CV register offset is calculated as 0x00 + > channel * 0x40 + 0x10. In the count_read() callback we can leverage > count->id to identify the TCC and thus get the respective TC_CV register > at offset + count->id * 0x40 + 0x10. > We can't do that because the TCC of a single TCB can have a mix of different features. I struggled with the breakage to move away from the one TCB, one feature state we had. Be fore this, it was not possible to mix features on a single TCB, now, we can have e.g. the clocksource on TCC 0 and 1 of TCB0 and a PWM on TCC 2. mchp_tc_probe must not match on a TCB node... -- Alexandre Belloni, co-owner and COO, Bootlin Embedded Linux and Kernel engineering https://bootlin.com