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Date: Wed, 23 Jan 2013 15:08:01 +0900
From: Dongjin Kim <tobetter@...il.com>
To: Thomas Abraham <thomas.abraham@...aro.org>
Cc: Chris Ball <cjb@...top.org>, Arnd Bergmann <arnd@...db.de>,
Will Newton <will.newton@...tec.com>,
linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mmc: host: dw_mmc-exynos: Add support for pinctrl
Hi Thomas,
I have a question regarding the bus setup when I use the patch
https://patchwork.kernel.org/patch/1870231. It configures buses as
defined in "pinctrl-0 = ...".
But in the function dw_mci_exynos_setup_bus(), it tries again to
configure gpios and probing is failed because there is no "gpios =
<...>" property. So I guess bus setup has to be ignored when the gpios
are configured with pinctrl.
What's your advice?
Thank you in advance.
Dongjin.
On Fri, Jan 4, 2013 at 3:33 AM, Dongjin Kim <tobetter@...il.com> wrote:
> Hi Thomas,
>
> Thank you for your reviewing, and
> https://patchwork.kernel.org/patch/1870231 works. So this change is
> needless.
>
> I had tested with below changes on my hardware.
>
> [1] https://patchwork.kernel.org/patch/1904431
> [2] https://patchwork.kernel.org/patch/1920661
>
> Best regards,
> Dongjin.
>
> On Mon, Dec 31, 2012 at 2:57 PM, Thomas Abraham
> <thomas.abraham@...aro.org> wrote:
>> On 21 December 2012 09:11, Dongjin Kim <tobetter@...il.com> wrote:
>>> This patch adds support for pin configuration using pinctrl subsystem to
>>> dw_mmc-exynos driver. The property 'wp-gpios' can be specified for write
>>> protect but 'samsung,cd-pinmux-gpio' and gpios used for clock, command and
>>> data lines will be ignored.
>>>
>>> -. 'pinctrl-0' should specify pin control groups (clock, comand and data
>>> lines) used for this controller.
>>> -. 'pinctrl-names' should contain only one value, 'default'.
>>>
>>> Signed-off-by: Dongjin Kim <tobetter@...il.com>
>>> ---
>>> drivers/mmc/host/dw_mmc-exynos.c | 44 ++++++++++++++++++++++++--------------
>>> 1 file changed, 28 insertions(+), 16 deletions(-)
>>>
>>> diff --git a/drivers/mmc/host/dw_mmc-exynos.c b/drivers/mmc/host/dw_mmc-exynos.c
>>> index 4d50da6..d1c9963 100644
>>> --- a/drivers/mmc/host/dw_mmc-exynos.c
>>> +++ b/drivers/mmc/host/dw_mmc-exynos.c
>>> @@ -16,6 +16,7 @@
>>> #include <linux/mmc/dw_mmc.h>
>>> #include <linux/of.h>
>>> #include <linux/of_gpio.h>
>>> +#include <linux/pinctrl/consumer.h>
>>>
>>> #include "dw_mmc.h"
>>> #include "dw_mmc-pltfm.h"
>>> @@ -49,6 +50,7 @@ struct dw_mci_exynos_priv_data {
>>> u8 ciu_div;
>>> u32 sdr_timing;
>>> u32 ddr_timing;
>>> + struct pinctrl *pctrl;
>>> };
>>>
>>> static struct dw_mci_exynos_compatible {
>>> @@ -84,6 +86,10 @@ static int dw_mci_exynos_priv_init(struct dw_mci *host)
>>> priv->ctrl_type = exynos_compat[idx].ctrl_type;
>>> }
>>>
>>> + priv->pctrl = devm_pinctrl_get_select_default(host->dev);
>>> + if (IS_ERR(priv->pctrl))
>>> + dev_dbg(host->dev, "no pinctrl node\n");
>>> +
>>
>> This could have been handled in dw_mci_exynos_setup_bus function. And
>> we also need to check if this patch gets merged.
>> https://patchwork.kernel.org/patch/1870231/. If it gets merged, this
>> change can be avoided.
>>
>>> host->priv = priv;
>>> return 0;
>>> }
>>> @@ -149,32 +155,19 @@ static int dw_mci_exynos_parse_dt(struct dw_mci *host)
>>> return ret;
>>>
>>> priv->ddr_timing = SDMMC_CLKSEL_TIMING(timing[0], timing[1], div);
>>> +
>>> return 0;
>>> }
>>>
>>> static int dw_mci_exynos_setup_bus(struct dw_mci *host,
>>> struct device_node *slot_np, u8 bus_width)
>>> {
>>> + struct dw_mci_exynos_priv_data *priv = host->priv;
>>> int idx, gpio, ret;
>>>
>>> if (!slot_np)
>>> return -EINVAL;
>>>
>>> - /* cmd + clock + bus-width pins */
>>> - for (idx = 0; idx < NUM_PINS(bus_width); idx++) {
>>> - gpio = of_get_gpio(slot_np, idx);
>>> - if (!gpio_is_valid(gpio)) {
>>> - dev_err(host->dev, "invalid gpio: %d\n", gpio);
>>> - return -EINVAL;
>>> - }
>>> -
>>> - ret = devm_gpio_request(host->dev, gpio, "dw-mci-bus");
>>> - if (ret) {
>>> - dev_err(host->dev, "gpio [%d] request failed\n", gpio);
>>> - return -EBUSY;
>>> - }
>>> - }
>>> -
>>> gpio = of_get_named_gpio(slot_np, "wp-gpios", 0);
>>> if (gpio_is_valid(gpio)) {
>>> if (devm_gpio_request(host->dev, gpio, "dw-mci-wp"))
>>> @@ -185,9 +178,12 @@ static int dw_mci_exynos_setup_bus(struct dw_mci *host,
>>> host->pdata->quirks |= DW_MCI_QUIRK_NO_WRITE_PROTECT;
>>> }
>>>
>>> - if (host->pdata->quirks & DW_MCI_QUIRK_BROKEN_CARD_DETECTION)
>>> + if (!IS_ERR(priv->pctrl))
>>> return 0;
>>>
>>> + if (host->pdata->quirks & DW_MCI_QUIRK_BROKEN_CARD_DETECTION)
>>> + goto setup_bus;
>>> +
>>
>> Why do the entire bus setup if card detection is broken?
>>
>>> gpio = of_get_named_gpio(slot_np, "samsung,cd-pinmux-gpio", 0);
>>> if (gpio_is_valid(gpio)) {
>>> if (devm_gpio_request(host->dev, gpio, "dw-mci-cd"))
>>> @@ -196,6 +192,22 @@ static int dw_mci_exynos_setup_bus(struct dw_mci *host,
>>> dev_info(host->dev, "cd gpio not available");
>>> }
>>>
>>> + setup_bus:
>>> + /* cmd + clock + bus-width pins */
>>> + for (idx = 0; idx < NUM_PINS(bus_width); idx++) {
>>> + gpio = of_get_gpio(slot_np, idx);
>>> + if (!gpio_is_valid(gpio)) {
>>> + dev_err(host->dev, "invalid gpio: %d\n", gpio);
>>> + return -EINVAL;
>>> + }
>>> +
>>> + ret = devm_gpio_request(host->dev, gpio, "dw-mci-bus");
>>> + if (ret) {
>>> + dev_err(host->dev, "gpio [%d] request failed\n", gpio);
>>> + return -EBUSY;
>>> + }
>>> + }
>>
>> This change should not have been there. If the mmc bus setup is being
>> done using pinctrl framework, this change can be avoided.
>>
>> Thanks,
>> Thomas.
>>
>>> +
>>> return 0;
>>> }
>>>
>>> --
>>> 1.7.9.5
>>>
--
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