From: Neil Armstrong <narmstrong@baylibre.com>
To: Stephen Boyd <stephen.boyd@linaro.org>, linux-usb@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org,
Andy Gross <andy.gross@linaro.org>,
Bjorn Andersson <bjorn.andersson@linaro.org>,
Arnd Bergmann <arnd@arndb.de>, Felipe Balbi <balbi@kernel.org>,
Kishon Vijay Abraham I <kishon@ti.com>,
devicetree@vger.kernel.org
Subject: Re: [PATCH 20/21] phy: Add support for Qualcomm's USB HSIC phy
Date: Wed, 29 Jun 2016 11:16:51 +0200 [thread overview]
Message-ID: <57739203.9000601@baylibre.com> (raw)
In-Reply-To: <146715109651.31418.4819151138932336863@sboyd-linaro>
On 06/28/2016 11:58 PM, Stephen Boyd wrote:
> Quoting Neil Armstrong (2016-06-28 01:49:37)
>> On 06/26/2016 09:28 AM, Stephen Boyd wrote:
>>> + uphy->cal_sleep_clk = clk = devm_clk_get(&ulpi->dev, "cal_sleep");
>>> + if (IS_ERR(clk))
>>> + return PTR_ERR(clk);
>>
>> Hi Stephen,
>>
>> In the bindings the cal_sleep is marked optional, and I think should be since AFAIK
>> it's not present on MDM9615 for example.
>
> The cal_sleep clk is just the sleep clk then (should be a board clk in
> DT). Sometimes there's a gate in GCC to allow us to turn it off, other
> times there isn't. Either way, it's always wired there so I'll update
> the binding to say it isn't optional.
Sorry I don't understand !
What should I do if GCC does not provide a gate here ? And looking at the driver, it could be optional.
>
>>
>> Also MDM9615 HSIC requires "core", "alt-core", "phy", "cal" and "iface" clocks.
>> I assume "core" can be attributed to the main chipidea node, but I think "alt-core" and "iface" should be also optionnal.
>
> Looking at the downstream sources I see this:
>
> "core_clk" -> usb_hsic_sys_clk
> "iface_clk" -> usb_hsic_p_clk
> "alt_core_clk" -> usb_hsic_xcvr_clk
>
> "cal_clk" -> usb_hsic_hsio_cal_clk
> "phy_clk" -> usb_hsic_clk
>
> "core_clk" would be the core clk in ci_hdrc_msm. "iface_clk" would be
> the iface clk in ci_hdrc_msm. "cal_clk" would be the cal clk in the hsic
> phy and "phy_clk" would be the phy clk in the hsic phy.
>
> That leaves alt_core_clk which seems to be a clock that needs to be on
> during the reset assert/deassert and possibly for LPM and USB1.1 FS
> modes. Sometimes it's referred to as the "housekeeping" clk. Due to the
> way resets are done on msm8974 and later SoCs it looks like this clk was
> removed. I can make this an optional clk in the ci_hdrc_msm driver, or
> we can have two versions of the ci_hdrc_msm compatible string, one for a
> device that has the housekeeping clk and one for the device that
> doesn't.
Having it optional would be the best solution I think.
>
>>
>> Finally, it misses an optional reset line AFAIK mandatory on MDM9615.
>>
>
> From what I can tell downstream, all those clks point to the same bit 0
> of HSIC_RESET register? So there isn't any phy reset, just the chipidea
> controller wrapper reset bit, which should go into the wrapper node?
Ok, makes sense.
next prev parent reply other threads:[~2016-06-29 9:17 UTC|newest]
Thread overview: 69+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-26 7:28 [PATCH 00/21] Support qcom's HSIC USB and rewrite USB2 HS phy support Stephen Boyd
2016-06-26 7:28 ` [PATCH 01/21] of: device: Support loading a module with OF based modalias Stephen Boyd
2016-06-28 4:17 ` Bjorn Andersson
2016-06-26 7:28 ` [PATCH 02/21] usb: ulpi: Support device discovery via DT Stephen Boyd
2016-06-27 4:21 ` kbuild test robot
2016-06-27 14:34 ` Heikki Krogerus
[not found] ` <146706544012.30684.15569003844798199881@sboyd-linaro>
2016-06-28 11:42 ` Heikki Krogerus
2016-06-29 1:53 ` Peter Chen
2016-06-28 20:56 ` Rob Herring
[not found] ` <146715176149.31418.10938517376423447782@sboyd-linaro>
2016-07-01 0:59 ` Rob Herring
2016-06-26 7:28 ` [PATCH 03/21] usb: ulpi: Avoid reading/writing in device creation with OF devices Stephen Boyd
2016-06-26 7:28 ` [PATCH 04/21] usb: chipidea: Only read/write OTGSC from one place Stephen Boyd
2016-06-27 8:04 ` Jun Li
2016-06-27 19:07 ` Stephen Boyd
2016-06-28 9:36 ` Peter Chen
2016-06-26 7:28 ` [PATCH 05/21] usb: chipidea: Handle extcon events properly Stephen Boyd
2016-06-28 10:01 ` Peter Chen
2016-06-26 7:28 ` [PATCH 06/21] usb: chipidea: Initialize and reinitialize phy later Stephen Boyd
2016-06-29 2:30 ` Peter Chen
[not found] ` <146724983020.16253.12640673678669134952@sboyd-linaro>
2016-06-30 1:22 ` Peter Chen
2016-06-26 7:28 ` [PATCH 07/21] usb: chipidea: Notify of reset when switching into host mode Stephen Boyd
2016-06-26 7:28 ` [PATCH 08/21] usb: chipidea: Kick OTG state machine for AVVIS with vbus extcon Stephen Boyd
2016-06-29 3:09 ` Peter Chen
[not found] ` <146724959973.16253.818114721999543873@sboyd-linaro>
2016-06-30 1:26 ` Peter Chen
2016-06-30 1:50 ` Jun Li
2016-06-26 7:28 ` [PATCH 09/21] usb: chipidea: Add support for ULPI PHY bus Stephen Boyd
2016-06-29 6:26 ` Peter Chen
2016-06-26 7:28 ` [PATCH 10/21] usb: chipidea: msm: Rely on core to override AHBBURST Stephen Boyd
2016-06-29 6:32 ` Peter Chen
[not found] ` <146722676163.16253.15476996138920236894@sboyd-linaro>
2016-06-30 1:18 ` Peter Chen
2016-06-26 7:28 ` [PATCH 11/21] usb: chipidea: msm: Use hw_write_id_reg() instead of writel directly Stephen Boyd
2016-06-29 6:37 ` Peter Chen
2016-06-26 7:28 ` [PATCH 12/21] usb: chipidea: msm: Keep device runtime enabled Stephen Boyd
2016-06-29 6:46 ` Peter Chen
[not found] ` <146724741028.16253.4741331543289283958@sboyd-linaro>
2016-06-30 1:39 ` Peter Chen
[not found] ` <146731865461.12823.6532384101517870130@sboyd-linaro>
2016-07-01 3:20 ` Peter Chen
2016-06-26 7:28 ` [PATCH 13/21] usb: chipidea: msm: Allow core to get usb phy Stephen Boyd
2016-06-29 6:48 ` Peter Chen
2016-06-29 11:34 ` Peter Chen
[not found] ` <146722867837.16253.5338887948471498730@sboyd-linaro>
2016-06-30 1:43 ` Peter Chen
2016-06-26 7:28 ` [PATCH 14/21] usb: chipidea: msm: Add proper clk and reset support Stephen Boyd
2016-06-29 7:02 ` Peter Chen
2016-06-26 7:28 ` [PATCH 15/21] usb: chipidea: msm: Mux over secondary phy at the right time Stephen Boyd
2016-06-28 4:51 ` Bjorn Andersson
2016-06-29 8:08 ` Peter Chen
[not found] ` <146722853892.16253.6137643683844696922@sboyd-linaro>
2016-06-30 1:52 ` Peter Chen
2016-06-26 7:28 ` [PATCH 16/21] usb: chipidea: msm: Restore wrapper settings after reset Stephen Boyd
2016-06-29 8:26 ` Peter Chen
[not found] ` <146722762509.16253.13062209537472705701@sboyd-linaro>
2016-06-30 8:54 ` Peter Chen
2016-06-30 16:24 ` Stephen Boyd
2016-06-26 7:28 ` [PATCH 17/21] usb: chipidea: msm: Make platform data driver local instead of global Stephen Boyd
2016-06-29 11:29 ` Peter Chen
[not found] ` <146722783258.16253.8246581455698560411@sboyd-linaro>
2016-06-30 9:08 ` Peter Chen
2016-06-26 7:28 ` [PATCH 18/21] usb: chipidea: msm: Add reset controller for PHY POR bit Stephen Boyd
2016-06-27 3:41 ` kbuild test robot
2016-06-27 4:51 ` kbuild test robot
2016-06-27 7:50 ` kbuild test robot
2016-06-29 11:45 ` Peter Chen
2016-06-26 7:28 ` [PATCH 19/21] usb: chipidea: msm: Be silent on probe defer errors Stephen Boyd
2016-06-30 1:06 ` Peter Chen
2016-06-26 7:28 ` [PATCH 20/21] phy: Add support for Qualcomm's USB HSIC phy Stephen Boyd
2016-06-28 8:49 ` Neil Armstrong
2016-06-28 21:58 ` Stephen Boyd
2016-06-29 9:16 ` Neil Armstrong [this message]
2016-06-29 18:54 ` Stephen Boyd
2016-06-26 7:28 ` [PATCH 21/21] phy: Add support for Qualcomm's USB HS phy Stephen Boyd
2016-06-28 3:09 ` [PATCH 00/21] Support qcom's HSIC USB and rewrite USB2 HS phy support John Stultz
[not found] ` <146710289677.3879.15364764209076318827@sboyd-linaro>
2016-07-02 6:03 ` John Stultz
[not found] ` <146774653916.32648.3323628902201136171@sboyd-linaro>
2016-07-05 19:33 ` John Stultz
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