From: Dmitry Osipenko <digetx@gmail.com>
To: Thierry Reding <thierry.reding@gmail.com>
Cc: "Jonathan Hunter" <jonathanh@nvidia.com>,
"Laxman Dewangan" <ldewangan@nvidia.com>,
"Wolfram Sang" <wsa@the-dreams.de>,
"Michał Mirosław" <mirq-linux@rere.qmqm.pl>,
"Andy Shevchenko" <andy.shevchenko@gmail.com>,
linux-i2c@vger.kernel.org, linux-tegra@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v7 12/34] i2c: tegra: Use clk-bulk helpers
Date: Thu, 17 Sep 2020 18:01:56 +0300 [thread overview]
Message-ID: <175e7f54-36f0-32c6-35a3-14c5b5e89e95@gmail.com> (raw)
In-Reply-To: <20200917113846.GX3515672@ulmo>
17.09.2020 14:38, Thierry Reding пишет:
> On Wed, Sep 09, 2020 at 01:39:44AM +0300, Dmitry Osipenko wrote:
>> Use clk-bulk helpers and factor out clocks initialization into separate
>> function in order to make code cleaner.
>>
>> The clocks initialization now performed after reset-control initialization
>> in order to avoid a noisy -PROBE_DEFER errors on T186+ from the clk-bulk
>> helper which doesn't silence this error code. Hence reset_control_get()
>> now may return -EPROBE_DEFER on newer Tegra SoCs because they use BPMP
>> driver that provides reset controls and BPMP doesn't come up early during
>> boot. Previously rst was protected by the clocks retrieval and now this
>> patch makes dev_err_probe() to be used for the rst error handling.
>>
>> Suggested-by: Andy Shevchenko <andy.shevchenko@gmail.com>
>> Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
>> ---
>> drivers/i2c/busses/i2c-tegra.c | 187 ++++++++++++---------------------
>> 1 file changed, 67 insertions(+), 120 deletions(-)
>
> This is tempting from a diffstat point of view, but the downside is that
> we can now no longer validate that all of the necessary clocks are given
> in device tree.
>
> Previously the driver would fail to probe the I2C controller if any of
> the expected clocks were not defined in device tree, but now it's just
> going to continue without it and not give any indication as to what's
> wrong.
The clocks can't be missed randomly in a device-tree because they are a
part of the core tegra.dtsi
The tegra-i2c DT binding isn't converted to YAML, but once it will be,
then the dtbs_check will tell you about such obvious problems like a
missing mandatory property.
Even if clock is missing, then you won't miss this problem since I2C
shouldn't work in that case.
There is a Qualcomm I2C driver that already uses clk_bulk_get_all() and
doesn't worry about "accidentally" missing clocks.
It's still possible to add the clk-num checking, but it should be
unpractical. We could always add it later on if there will be a real
incident. Do you agree?
next prev parent reply other threads:[~2020-09-17 15:04 UTC|newest]
Thread overview: 146+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-08 22:39 [PATCH v7 00/34] Improvements for Tegra I2C driver Dmitry Osipenko
2020-09-08 22:39 ` [PATCH v7 01/34] i2c: tegra: Make tegra_i2c_flush_fifos() usable in atomic transfer Dmitry Osipenko
2020-09-17 11:10 ` Thierry Reding
2020-09-17 14:57 ` Dmitry Osipenko
2020-09-21 10:18 ` Thierry Reding
2020-09-08 22:39 ` [PATCH v7 02/34] i2c: tegra: Add missing pm_runtime_put() Dmitry Osipenko
2020-09-17 11:12 ` Thierry Reding
2020-09-21 10:18 ` Thierry Reding
2020-09-08 22:39 ` [PATCH v7 03/34] i2c: tegra: Handle potential error of tegra_i2c_flush_fifos() Dmitry Osipenko
2020-09-17 11:13 ` Thierry Reding
2020-09-21 10:18 ` Thierry Reding
2020-09-08 22:39 ` [PATCH v7 04/34] i2c: tegra: Mask interrupt in tegra_i2c_issue_bus_clear() Dmitry Osipenko
2020-09-17 11:18 ` Thierry Reding
2020-09-21 10:18 ` Thierry Reding
2020-09-08 22:39 ` [PATCH v7 05/34] i2c: tegra: Initialize div-clk rate unconditionally Dmitry Osipenko
2020-09-17 11:20 ` Thierry Reding
2020-09-21 10:18 ` Thierry Reding
2020-09-08 22:39 ` [PATCH v7 06/34] i2c: tegra: Remove i2c_dev.clk_divisor_non_hs_mode member Dmitry Osipenko
2020-09-17 11:25 ` Thierry Reding
2020-09-17 15:27 ` Dmitry Osipenko
2020-09-21 10:49 ` Thierry Reding
2020-09-21 10:18 ` Thierry Reding
2020-09-08 22:39 ` [PATCH v7 07/34] i2c: tegra: Runtime PM always available on Tegra Dmitry Osipenko
2020-09-17 11:26 ` Thierry Reding
2020-09-21 10:18 ` Thierry Reding
2020-09-08 22:39 ` [PATCH v7 08/34] i2c: tegra: Remove error message used for devm_request_irq() failure Dmitry Osipenko
2020-09-17 11:28 ` Thierry Reding
2020-09-17 14:59 ` Dmitry Osipenko
2020-09-21 10:57 ` Thierry Reding
2020-09-21 10:18 ` Thierry Reding
2020-09-08 22:39 ` [PATCH v7 09/34] i2c: tegra: Use reset_control_reset() Dmitry Osipenko
2020-09-17 12:36 ` Thierry Reding
2020-09-21 10:19 ` Thierry Reding
2020-09-08 22:39 ` [PATCH v7 10/34] i2c: tegra: Use devm_platform_get_and_ioremap_resource() Dmitry Osipenko
2020-09-17 11:31 ` Thierry Reding
2020-09-21 10:19 ` Thierry Reding
2020-09-08 22:39 ` [PATCH v7 11/34] i2c: tegra: Use platform_get_irq() Dmitry Osipenko
2020-09-17 11:31 ` Thierry Reding
2020-09-21 10:19 ` Thierry Reding
2020-09-08 22:39 ` [PATCH v7 12/34] i2c: tegra: Use clk-bulk helpers Dmitry Osipenko
2020-09-17 11:38 ` Thierry Reding
2020-09-17 13:54 ` Andy Shevchenko
2020-09-21 11:01 ` Thierry Reding
2020-09-21 11:15 ` Andy Shevchenko
2020-09-21 11:53 ` Thierry Reding
2020-09-17 15:01 ` Dmitry Osipenko [this message]
2020-09-21 11:08 ` Thierry Reding
2020-09-21 11:12 ` Thierry Reding
2020-09-21 14:44 ` Dmitry Osipenko
2020-09-21 10:19 ` Thierry Reding
2020-09-08 22:39 ` [PATCH v7 13/34] i2c: tegra: Move out all device-tree parsing into tegra_i2c_parse_dt() Dmitry Osipenko
2020-09-17 11:35 ` Thierry Reding
2020-09-21 10:19 ` Thierry Reding
2020-09-08 22:39 ` [PATCH v7 14/34] i2c: tegra: Clean up probe function Dmitry Osipenko
2020-09-17 12:37 ` Thierry Reding
2020-09-17 13:46 ` Andy Shevchenko
2020-09-21 11:15 ` Thierry Reding
2020-09-17 15:02 ` Dmitry Osipenko
2020-09-21 11:17 ` Thierry Reding
2020-09-21 10:19 ` Thierry Reding
2020-09-08 22:39 ` [PATCH v7 15/34] i2c: tegra: Reorder location of functions in the code Dmitry Osipenko
2020-09-17 12:38 ` Thierry Reding
2020-09-21 10:19 ` Thierry Reding
2020-09-08 22:39 ` [PATCH v7 16/34] i2c: tegra: Clean up variable types Dmitry Osipenko
2020-09-17 12:39 ` Thierry Reding
2020-09-21 10:19 ` Thierry Reding
2020-09-08 22:39 ` [PATCH v7 17/34] i2c: tegra: Remove outdated barrier() Dmitry Osipenko
2020-09-17 12:39 ` Thierry Reding
2020-09-21 10:19 ` Thierry Reding
2020-09-08 22:39 ` [PATCH v7 18/34] i2c: tegra: Remove likely/unlikely from the code Dmitry Osipenko
2020-09-17 12:41 ` Thierry Reding
2020-09-21 10:19 ` Thierry Reding
2020-09-08 22:39 ` [PATCH v7 19/34] i2c: tegra: Remove redundant check in tegra_i2c_issue_bus_clear() Dmitry Osipenko
2020-09-17 12:42 ` Thierry Reding
2020-09-21 10:19 ` Thierry Reding
2020-09-08 22:39 ` [PATCH v7 20/34] i2c: tegra: Remove "dma" variable from tegra_i2c_xfer_msg() Dmitry Osipenko
2020-09-17 11:44 ` Thierry Reding
2020-09-21 10:19 ` Thierry Reding
2020-09-08 22:39 ` [PATCH v7 21/34] i2c: tegra: Don't fall back to PIO mode if DMA configuration fails Dmitry Osipenko
2020-09-17 11:47 ` Thierry Reding
2020-09-17 15:03 ` Dmitry Osipenko
2020-09-21 11:21 ` Thierry Reding
2020-09-21 10:19 ` Thierry Reding
2020-09-08 22:39 ` [PATCH v7 22/34] i2c: tegra: Rename wait/poll functions Dmitry Osipenko
2020-09-17 11:48 ` Thierry Reding
2020-09-21 10:19 ` Thierry Reding
2020-09-08 22:39 ` [PATCH v7 23/34] i2c: tegra: Factor out error recovery from tegra_i2c_xfer_msg() Dmitry Osipenko
2020-09-17 11:49 ` Thierry Reding
2020-09-21 10:20 ` Thierry Reding
2020-09-08 22:39 ` [PATCH v7 24/34] i2c: tegra: Factor out packet header setup " Dmitry Osipenko
2020-09-17 11:51 ` Thierry Reding
2020-09-21 10:20 ` Thierry Reding
2020-09-08 22:39 ` [PATCH v7 25/34] i2c: tegra: Factor out register polling into separate function Dmitry Osipenko
2020-09-17 11:58 ` Thierry Reding
2020-09-17 15:05 ` Dmitry Osipenko
2020-09-21 11:22 ` Thierry Reding
2020-09-21 10:20 ` Thierry Reding
2020-09-08 22:39 ` [PATCH v7 26/34] i2c: tegra: Factor out hardware initialization " Dmitry Osipenko
2020-09-17 12:06 ` Thierry Reding
2020-09-21 10:20 ` Thierry Reding
2020-09-08 22:39 ` [PATCH v7 27/34] i2c: tegra: Check errors for both positive and negative values Dmitry Osipenko
2020-09-17 12:09 ` Thierry Reding
2020-09-17 13:50 ` Andy Shevchenko
2020-09-21 11:24 ` Thierry Reding
2020-09-21 14:13 ` Dmitry Osipenko
2020-09-21 10:20 ` Thierry Reding
2020-09-08 22:40 ` [PATCH v7 28/34] i2c: tegra: Consolidate error handling in tegra_i2c_xfer_msg() Dmitry Osipenko
2020-09-17 12:12 ` Thierry Reding
2020-09-21 10:20 ` Thierry Reding
2020-09-08 22:40 ` [PATCH v7 29/34] i2c: tegra: Improve formatting of variables Dmitry Osipenko
2020-09-17 12:16 ` Thierry Reding
2020-09-17 15:13 ` Dmitry Osipenko
2020-09-21 11:28 ` Thierry Reding
2020-09-21 10:20 ` Thierry Reding
2020-09-08 22:40 ` [PATCH v7 30/34] i2c: tegra: Clean up variable names Dmitry Osipenko
2020-09-17 12:21 ` Thierry Reding
2020-09-17 15:43 ` Dmitry Osipenko
2020-09-21 11:40 ` Thierry Reding
2020-09-21 15:18 ` Dmitry Osipenko
2020-09-21 15:50 ` Thierry Reding
2020-09-21 16:05 ` Dmitry Osipenko
2020-09-21 10:20 ` Thierry Reding
2020-09-08 22:40 ` [PATCH v7 31/34] i2c: tegra: Clean up printk messages Dmitry Osipenko
2020-09-17 12:22 ` Thierry Reding
2020-09-21 10:20 ` Thierry Reding
2020-09-08 22:40 ` [PATCH v7 32/34] i2c: tegra: Clean up and improve comments Dmitry Osipenko
2020-09-17 12:32 ` Thierry Reding
2020-09-17 15:02 ` Dmitry Osipenko
2020-09-17 15:17 ` Dmitry Osipenko
2020-09-21 11:43 ` Thierry Reding
2020-09-21 11:44 ` Thierry Reding
2020-09-21 10:20 ` Thierry Reding
2020-09-08 22:40 ` [PATCH v7 33/34] i2c: tegra: Clean up whitespaces, newlines and indentation Dmitry Osipenko
2020-09-17 12:35 ` Thierry Reding
2020-09-21 10:20 ` Thierry Reding
2020-09-08 22:40 ` [PATCH v7 34/34] i2c: tegra: Improve driver module description Dmitry Osipenko
2020-09-17 12:35 ` Thierry Reding
2020-09-21 10:20 ` Thierry Reding
2020-09-09 9:11 ` [PATCH v7 00/34] Improvements for Tegra I2C driver Andy Shevchenko
2020-09-09 15:36 ` Dmitry Osipenko
2020-09-09 15:49 ` Wolfram Sang
2020-09-09 17:39 ` Dmitry Osipenko
2020-09-17 12:44 ` Thierry Reding
2020-09-21 9:12 ` Wolfram Sang
2020-09-21 10:18 ` Thierry Reding
2020-09-21 10:42 ` Thierry Reding
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