lkml.org 
[lkml]   [2022]   [Dec]   [28]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Date
SubjectRe: [PATCH v3 1/2] mmc: atmel-mci: Convert to gpio descriptors
Hi Balamanikandan,

thanks for your patch!

On Mon, Dec 26, 2022 at 8:39 AM Balamanikandan Gunasundar
<balamanikandan.gunasundar@microchip.com> wrote:

> Replace the legacy GPIO APIs with gpio descriptor consumer interface.
>
> To maintain backward compatibility, we rely on the "cd-inverted"
> property to manage the invertion flag instead of GPIO property.
>
> Signed-off-by: Balamanikandan Gunasundar <balamanikandan.gunasundar@microchip.com>

Overall this looks really nice! I thought about converting this driver
but was a bit afraid of doing mistakes since it was a bit elaborate.
Nice that you use fwnode accessors!

Acked-by: Linus Walleij <linus.walleij@linaro.org>

Improvement to consider (can also be a separate patch):

> + if (slot->detect_pin) {
> + present = !(gpiod_get_raw_value(slot->detect_pin) ^
> slot->detect_is_active_high);

Normally we contain all this active low/high mess in mmc_of_parse(),
but I guess this doesn't work here because the of node is different
from the device :P

Since the code says *explicitly* "active high" not "inverted" as the
core code parses it, could you try just push this to gpiolib like
we usually do, by deleting the detect_is_active_high stuff and
just apply a patch like this?

diff --git a/drivers/gpio/gpiolib-of.c b/drivers/gpio/gpiolib-of.c
index 4fff7258ee41..5979c9a75cf9 100644
--- a/drivers/gpio/gpiolib-of.c
+++ b/drivers/gpio/gpiolib-of.c
@@ -199,7 +199,9 @@ static void of_gpio_set_polarity_by_property(const
struct device_node *np,
{ "fsl,imx8mm-pcie", "reset-gpio", "reset-gpio-active-high" },
{ "fsl,imx8mp-pcie", "reset-gpio", "reset-gpio-active-high" },
#endif
-
+#if IS_ENABLED(CONFIG_MMC_ATMELMCI)
+ { "atmel,hsmci", "cd-gpios", "cd-inverted" },
+#endif
/*
* The regulator GPIO handles are specified such that the
* presence or absence of "enable-active-high" solely controls
(It's fine to include in your MMC patch if some GPIO maintainer like
me ACK it.)

Yours,
Linus Walleij

\
 
 \ /
  Last update: 2023-03-26 23:22    [W:0.070 / U:0.776 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site