From: Ludovic BARRE <ludovic.barre@st.com>
To: Ulf Hansson <ulf.hansson@linaro.org>
Cc: Rob Herring <robh+dt@kernel.org>,
Maxime Coquelin <mcoquelin.stm32@gmail.com>,
Alexandre Torgue <alexandre.torgue@st.com>,
Benjamin Gaignard <benjamin.gaignard@linaro.org>,
Gerald Baeza <gerald.baeza@st.com>,
Loic Pallardy <loic.pallardy@st.com>,
Linux ARM <linux-arm-kernel@lists.infradead.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
DTML <devicetree@vger.kernel.org>,
"linux-mmc@vger.kernel.org" <linux-mmc@vger.kernel.org>,
<linux-stm32@st-md-mailman.stormreply.com>
Subject: Re: [PATCH V2 23/27] mmc: mmci: add variant property to request a reset
Date: Mon, 1 Oct 2018 14:16:00 +0200 [thread overview]
Message-ID: <a956549b-a84e-2582-1fce-3b15495f208c@st.com> (raw)
In-Reply-To: <CAPDyKFqxBuQcafS2KFqPDwb4=V1Jwoovb4+VsJZjAA5CeKs2kw@mail.gmail.com>
hi Ulf
On 10/01/2018 11:30 AM, Ulf Hansson wrote:
> On 21 September 2018 at 11:46, Ludovic Barre <ludovic.Barre@st.com> wrote:
>> From: Ludovic Barre <ludovic.barre@st.com>
>>
>> Some variants could require a reset.
>> STM32 sdmmc variant needs to reset hardware block
>> during the power cycle procedure (for re-initialization)
>>
>> Signed-off-by: Ludovic Barre <ludovic.barre@st.com>
>> ---
>> Documentation/devicetree/bindings/mmc/mmci.txt | 2 ++
>> drivers/mmc/host/mmci.c | 9 +++++++++
>> drivers/mmc/host/mmci.h | 4 ++++
>> 3 files changed, 15 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/mmc/mmci.txt b/Documentation/devicetree/bindings/mmc/mmci.txt
>> index 03796cf..e952707 100644
>> --- a/Documentation/devicetree/bindings/mmc/mmci.txt
>> +++ b/Documentation/devicetree/bindings/mmc/mmci.txt
>> @@ -11,6 +11,8 @@ Required properties:
>> - compatible : contains "arm,pl18x", "arm,primecell".
>> - vmmc-supply : phandle to the regulator device tree node, mentioned
>> as the VCC/VDD supply in the eMMC/SD specs.
>> +depend of variant:
>> +- resets : phandle to internal reset line.
>>
>
> This looks like a thing depending on the SoC, rather than on the
> variant. Therefore, I suggest you move this to be an optional DT
> property.
could be replaced by:
Optional properties:
- resets : phandle to internal reset line.
Should be defined for sdmmc variant.
>
> Also, please move the DT doc update into a separate patch.
OK
>
>> Optional properties:
>> - arm,primecell-periphid : contains the PrimeCell Peripheral ID, it overrides
>> diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c
>> index b1d5bc5..6b3c33f 100644
>> --- a/drivers/mmc/host/mmci.c
>> +++ b/drivers/mmc/host/mmci.c
>> @@ -37,6 +37,7 @@
>> #include <linux/pm_runtime.h>
>> #include <linux/types.h>
>> #include <linux/pinctrl/consumer.h>
>> +#include <linux/reset.h>
>>
>> #include <asm/div64.h>
>> #include <asm/io.h>
>> @@ -1854,6 +1855,14 @@ static int mmci_probe(struct amba_device *dev,
>>
>> dev_dbg(mmc_dev(mmc), "clocking block at %u Hz\n", mmc->f_max);
>>
>> + if (variant->reset) {
>> + host->rst = devm_reset_control_get_exclusive(&dev->dev, NULL);
>
> As suggested, let's make this optional and not depending on the variant.
I done like that because is required for my variant (if no reset, no
power cycle for sdmmc).
If you prefer, I could move to optional with
"devm_reset_control_get_optional_exclusive"
And I add a comment in mmci dt binding to specify that not optional
for sdmmc. (see above)
>
>> + if (IS_ERR(host->rst)) {
>> + ret = PTR_ERR(host->rst);
>> + goto clk_disable;
>> + }
>> + }
>> +
>> /* Get regulators and the supported OCR mask */
>> ret = mmc_regulator_get_supply(mmc);
>> if (ret)
>> diff --git a/drivers/mmc/host/mmci.h b/drivers/mmc/host/mmci.h
>> index e130689..f0fa185 100644
>> --- a/drivers/mmc/host/mmci.h
>> +++ b/drivers/mmc/host/mmci.h
>> @@ -247,6 +247,7 @@ struct mmci_host;
>> * @start_err: bitmask identifying the STARTBITERR bit inside MMCISTATUS
>> * register.
>> * @opendrain: bitmask identifying the OPENDRAIN bit inside MMCIPOWER register
>> + * @reset: true if variant has need reset signal.
>> */
>> struct variant_data {
>> unsigned int clkreg;
>> @@ -285,6 +286,7 @@ struct variant_data {
>> bool qcom_dml;
>> bool reversed_irq_handling;
>> bool mmcimask1;
>> + bool reset;
>> unsigned int irq_pio_mask;
>> u32 start_err;
>> u32 opendrain;
>> @@ -318,6 +320,8 @@ struct mmci_host {
>> struct clk *clk;
>> bool singleirq;
>>
>> + struct reset_control *rst;
>> +
>> spinlock_t lock;
>>
>> unsigned int mclk;
>> --
>> 2.7.4
>>
>
> Kind regards
> Uffe
>
next prev parent reply other threads:[~2018-10-01 12:16 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-21 9:45 [PATCH V2 00/27] mmc: mmci: add sdmmc variant for stm32 Ludovic Barre
2018-09-21 9:45 ` [PATCH V2 01/27] mmc: mmci: internalize dma map/unmap into mmci dma functions Ludovic Barre
2018-09-26 23:49 ` Ulf Hansson
2018-09-21 9:45 ` [PATCH V2 02/27] mmc: mmci: internalize dma_inprogress " Ludovic Barre
2018-09-26 23:49 ` Ulf Hansson
2018-09-21 9:45 ` [PATCH V2 03/27] mmc: mmci: convert dma_setup callback to return an int Ludovic Barre
2018-09-24 14:28 ` Ulf Hansson
2018-09-24 16:12 ` Ludovic BARRE
2018-09-26 23:49 ` Ulf Hansson
2018-09-27 8:55 ` Srinivas Kandagatla
2018-09-21 9:45 ` [PATCH V2 04/27] mmc: mmci: introduce dma_priv pointer to mmci_host Ludovic Barre
2018-09-24 18:52 ` Ulf Hansson
2018-09-25 7:19 ` Ludovic BARRE
2018-09-21 9:45 ` [PATCH V2 05/27] mmc: mmci: move mmci next cookie to mci host Ludovic Barre
2018-09-24 18:46 ` Ulf Hansson
2018-09-25 7:08 ` Ludovic BARRE
2018-09-21 9:46 ` [PATCH V2 06/27] mmc: mmci: merge prepare data functions Ludovic Barre
2018-09-21 9:46 ` [PATCH V2 07/27] mmc: mmci: add prepare/unprepare_data callbacks Ludovic Barre
2018-09-21 9:46 ` [PATCH V2 08/27] mmc: mmci: add get_next_data callback Ludovic Barre
2018-09-21 9:46 ` [PATCH V2 09/27] mmc: mmci: modify dma_setup callback Ludovic Barre
2018-10-01 9:30 ` Ulf Hansson
2018-10-01 9:43 ` Ludovic BARRE
2018-09-21 9:46 ` [PATCH V2 10/27] mmc: mmci: add dma_release callback Ludovic Barre
2018-09-21 9:46 ` [PATCH V2 11/27] mmc: mmci: add dma_start callback Ludovic Barre
2018-09-21 9:46 ` [PATCH V2 12/27] mmc: mmci: add dma_finalize callback Ludovic Barre
2018-09-21 9:46 ` [PATCH V2 13/27] mmc: mmci: add dma_error callback Ludovic Barre
2018-09-21 9:46 ` [PATCH V2 14/27] mmc: mmci: add validate_data callback Ludovic Barre
2018-09-21 9:46 ` [PATCH V2 15/27] mmc: mmci: add set_clk/pwrreg callbacks Ludovic Barre
2018-09-21 9:46 ` [PATCH V2 16/27] mmc: mmci: add datactrl block size variant property Ludovic Barre
2018-09-21 9:46 ` [PATCH V2 17/27] mmc: mmci: expand startbiterr to irqmask and error check Ludovic Barre
2018-09-21 9:46 ` [PATCH V2 18/27] mmc: mmci: add variant properties to define cpsm & cmdresp bits Ludovic Barre
2018-09-21 9:46 ` [PATCH V2 19/27] mmc: mmci: add variant property to define dpsm bit Ludovic Barre
2018-09-21 9:46 ` [PATCH V2 20/27] mmc: mmci: add variant property to define irq pio mask Ludovic Barre
2018-09-21 9:46 ` [PATCH V2 21/27] mmc: mmci: add variant property to write datactrl before command Ludovic Barre
2018-09-21 9:46 ` [PATCH V2 22/27] mmc: mmci: add variant property to not read datacnt Ludovic Barre
2018-09-21 9:46 ` [PATCH V2 23/27] mmc: mmci: add variant property to request a reset Ludovic Barre
2018-10-01 9:30 ` Ulf Hansson
2018-10-01 12:16 ` Ludovic BARRE [this message]
2018-10-01 13:43 ` Ulf Hansson
2018-09-21 9:46 ` [PATCH V2 24/27] mmc: mmci: add clock divider for stm32 sdmmc Ludovic Barre
2018-09-21 9:46 ` [PATCH V2 25/27] mmc: mmci: add stm32 sdmmc registers Ludovic Barre
2018-09-21 9:46 ` [PATCH V2 26/27] mmc: mmci: add DT bindings for STM32 sdmmc Ludovic Barre
2018-09-25 15:27 ` Rob Herring
2018-10-01 9:30 ` Ulf Hansson
2018-09-21 9:46 ` [PATCH V2 27/27] mmc: mmci: add stm32 sdmmc variant Ludovic Barre
2018-10-01 9:31 ` Ulf Hansson
2018-10-01 12:56 ` Ludovic BARRE
2018-10-01 13:39 ` Ulf Hansson
2018-10-01 13:53 ` Ludovic BARRE
-- strict thread matches above, loose matches on Subject: below --
2018-09-18 10:55 [PATCH V2 00/27] mmc: mmci: add sdmmc variant for stm32 Ludovic Barre
2018-09-18 10:55 ` [PATCH V2 23/27] mmc: mmci: add variant property to request a reset Ludovic Barre
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=a956549b-a84e-2582-1fce-3b15495f208c@st.com \
--to=ludovic.barre@st.com \
--cc=alexandre.torgue@st.com \
--cc=benjamin.gaignard@linaro.org \
--cc=devicetree@vger.kernel.org \
--cc=gerald.baeza@st.com \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mmc@vger.kernel.org \
--cc=linux-stm32@st-md-mailman.stormreply.com \
--cc=loic.pallardy@st.com \
--cc=mcoquelin.stm32@gmail.com \
--cc=robh+dt@kernel.org \
--cc=ulf.hansson@linaro.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).