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[46.138.120.72]) by smtp.googlemail.com with ESMTPSA id e19sm868158ljj.28.2021.08.21.10.45.55 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sat, 21 Aug 2021 10:45:56 -0700 (PDT) Subject: Re: [PATCH v8 07/34] clk: tegra: Support runtime PM and power domain To: Ulf Hansson , Thierry Reding Cc: Jonathan Hunter , Viresh Kumar , Stephen Boyd , Peter De Schrijver , Mikko Perttunen , Peter Chen , Mark Brown , Lee Jones , =?UTF-8?Q?Uwe_Kleine-K=c3=b6nig?= , Nishanth Menon , Vignesh Raghavendra , Richard Weinberger , Miquel Raynal , Lucas Stach , Stefan Agner , Adrian Hunter , Mauro Carvalho Chehab , Rob Herring , Michael Turquette , Linux Kernel Mailing List , linux-tegra , Linux PM , Linux USB List , linux-staging@lists.linux.dev, linux-spi@vger.kernel.org, linux-pwm@vger.kernel.org, linux-mtd@lists.infradead.org, linux-mmc , Linux Media Mailing List , dri-devel , DTML , linux-clk References: <20210817012754.8710-1-digetx@gmail.com> <20210817012754.8710-8-digetx@gmail.com> From: Dmitry Osipenko Message-ID: <89ea1694-be9e-7654-abeb-22de0ca5255a@gmail.com> Date: Sat, 21 Aug 2021 20:45:54 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-clk@vger.kernel.org 20.08.2021 16:08, Ulf Hansson пишет: ... >> I suppose if there's really no good way of doing this other than >> providing a struct device, then so be it. I think the cleaned up sysfs >> shown in the summary above looks much better than what the original >> would've looked like. >> >> Perhaps an additional tweak to that would be to not create platform >> devices. Instead, just create struct device. Those really have >> everything you need (.of_node, and can be used with RPM and GENPD). As I >> mentioned earlier, platform device implies a CPU-memory-mapped bus, >> which this clearly isn't. It's kind of a separate "bus" if you want, so >> just using struct device directly seems more appropriate. > > Just a heads up. If you don't use a platform device or have a driver > associated with it for probing, you need to manage the attachment to > genpd yourself. That means calling one of the dev_pm_domain_attach*() > APIs, but that's perfectly fine, ofcourse. > >> >> We did something similar for XUSB pads, see drivers/phy/tegra/xusb.[ch] >> for an example of how that was done. I think you can do something >> similar here. We need a platform device because we have a platform device driver that must be bound to the device, otherwise PMC driver state won't be synced since it it's synced after all drivers of devices that reference PMC node in DT are probed. 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[46.138.120.72]) by smtp.googlemail.com with ESMTPSA id e19sm868158ljj.28.2021.08.21.10.45.55 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sat, 21 Aug 2021 10:45:56 -0700 (PDT) Subject: Re: [PATCH v8 07/34] clk: tegra: Support runtime PM and power domain To: Ulf Hansson , Thierry Reding Cc: Jonathan Hunter , Viresh Kumar , Stephen Boyd , Peter De Schrijver , Mikko Perttunen , Peter Chen , Mark Brown , Lee Jones , =?UTF-8?Q?Uwe_Kleine-K=c3=b6nig?= , Nishanth Menon , Vignesh Raghavendra , Richard Weinberger , Miquel Raynal , Lucas Stach , Stefan Agner , Adrian Hunter , Mauro Carvalho Chehab , Rob Herring , Michael Turquette , Linux Kernel Mailing List , linux-tegra , Linux PM , Linux USB List , linux-staging@lists.linux.dev, linux-spi@vger.kernel.org, linux-pwm@vger.kernel.org, linux-mtd@lists.infradead.org, linux-mmc , Linux Media Mailing List , dri-devel , DTML , linux-clk References: <20210817012754.8710-1-digetx@gmail.com> <20210817012754.8710-8-digetx@gmail.com> From: Dmitry Osipenko Message-ID: <89ea1694-be9e-7654-abeb-22de0ca5255a@gmail.com> Date: Sat, 21 Aug 2021 20:45:54 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 In-Reply-To: Content-Language: en-US X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210821_104559_393371_791EE2FC X-CRM114-Status: GOOD ( 21.40 ) X-BeenThere: linux-mtd@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-mtd" Errors-To: linux-mtd-bounces+linux-mtd=archiver.kernel.org@lists.infradead.org MjAuMDguMjAyMSAxNjowOCwgVWxmIEhhbnNzb24g0L/QuNGI0LXRgjoKLi4uCj4+IEkgc3VwcG9z ZSBpZiB0aGVyZSdzIHJlYWxseSBubyBnb29kIHdheSBvZiBkb2luZyB0aGlzIG90aGVyIHRoYW4K Pj4gcHJvdmlkaW5nIGEgc3RydWN0IGRldmljZSwgdGhlbiBzbyBiZSBpdC4gSSB0aGluayB0aGUg Y2xlYW5lZCB1cCBzeXNmcwo+PiBzaG93biBpbiB0aGUgc3VtbWFyeSBhYm92ZSBsb29rcyBtdWNo IGJldHRlciB0aGFuIHdoYXQgdGhlIG9yaWdpbmFsCj4+IHdvdWxkJ3ZlIGxvb2tlZCBsaWtlLgo+ Pgo+PiBQZXJoYXBzIGFuIGFkZGl0aW9uYWwgdHdlYWsgdG8gdGhhdCB3b3VsZCBiZSB0byBub3Qg Y3JlYXRlIHBsYXRmb3JtCj4+IGRldmljZXMuIEluc3RlYWQsIGp1c3QgY3JlYXRlIHN0cnVjdCBk ZXZpY2UuIFRob3NlIHJlYWxseSBoYXZlCj4+IGV2ZXJ5dGhpbmcgeW91IG5lZWQgKC5vZl9ub2Rl LCBhbmQgY2FuIGJlIHVzZWQgd2l0aCBSUE0gYW5kIEdFTlBEKS4gQXMgSQo+PiBtZW50aW9uZWQg ZWFybGllciwgcGxhdGZvcm0gZGV2aWNlIGltcGxpZXMgYSBDUFUtbWVtb3J5LW1hcHBlZCBidXMs Cj4+IHdoaWNoIHRoaXMgY2xlYXJseSBpc24ndC4gSXQncyBraW5kIG9mIGEgc2VwYXJhdGUgImJ1 cyIgaWYgeW91IHdhbnQsIHNvCj4+IGp1c3QgdXNpbmcgc3RydWN0IGRldmljZSBkaXJlY3RseSBz ZWVtcyBtb3JlIGFwcHJvcHJpYXRlLgo+IAo+IEp1c3QgYSBoZWFkcyB1cC4gSWYgeW91IGRvbid0 IHVzZSBhIHBsYXRmb3JtIGRldmljZSBvciBoYXZlIGEgZHJpdmVyCj4gYXNzb2NpYXRlZCB3aXRo IGl0IGZvciBwcm9iaW5nLCB5b3UgbmVlZCB0byBtYW5hZ2UgdGhlIGF0dGFjaG1lbnQgdG8KPiBn ZW5wZCB5b3Vyc2VsZi4gVGhhdCBtZWFucyBjYWxsaW5nIG9uZSBvZiB0aGUgZGV2X3BtX2RvbWFp bl9hdHRhY2gqKCkKPiBBUElzLCBidXQgdGhhdCdzIHBlcmZlY3RseSBmaW5lLCBvZmNvdXJzZS4K PiAKPj4KPj4gV2UgZGlkIHNvbWV0aGluZyBzaW1pbGFyIGZvciBYVVNCIHBhZHMsIHNlZSBkcml2 ZXJzL3BoeS90ZWdyYS94dXNiLltjaF0KPj4gZm9yIGFuIGV4YW1wbGUgb2YgaG93IHRoYXQgd2Fz IGRvbmUuIEkgdGhpbmsgeW91IGNhbiBkbyBzb21ldGhpbmcKPj4gc2ltaWxhciBoZXJlLgoKV2Ug bmVlZCBhIHBsYXRmb3JtIGRldmljZSBiZWNhdXNlIHdlIGhhdmUgYSBwbGF0Zm9ybSBkZXZpY2Ug ZHJpdmVyIHRoYXQKbXVzdCBiZSBib3VuZCB0byB0aGUgZGV2aWNlLCBvdGhlcndpc2UgUE1DIGRy aXZlciBzdGF0ZSB3b24ndCBiZSBzeW5jZWQKc2luY2UgaXQgaXQncyBzeW5jZWQgYWZ0ZXIgYWxs IGRyaXZlcnMgb2YgZGV2aWNlcyB0aGF0IHJlZmVyZW5jZSBQTUMKbm9kZSBpbiBEVCBhcmUgcHJv YmVkLgoKX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fCkxpbnV4IE1URCBkaXNjdXNzaW9uIG1haWxpbmcgbGlzdApodHRwOi8vbGlzdHMuaW5mcmFk ZWFkLm9yZy9tYWlsbWFuL2xpc3RpbmZvL2xpbnV4LW10ZC8K