lkml.org 
[lkml]   [2019]   [May]   [2]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH v5 7/7] ARM: dts: sun8i: v40: bananapi-m2-berry: Add Bluetooth device node
On Tue, Apr 23, 2019 at 02:26:04PM -0300, Pablo Greco wrote:
> The AP6212 is based on the Broadcom BCM43430 or BCM43438. The WiFi side
> identifies as BCM43430, while the Bluetooth side identifies as BCM43438.
>
> The Bluetooth side is connected to UART3 in a 4 wire configuration. Same
> as the WiFi side, due to being the same chip and package, DLDO1 and
> DLDO2 regulator outputs from the PMIC provide overall power via VBAT and
> I/O power via VDDIO. The CLK_OUT_A clock output from the SoC provides
> the LPO low power clock at 32.768 kHz.
>
> This patch enables Bluetooth on this board, and also adds the missing
> LPO clock on the WiFi side. There is also a PCM connection for
> Bluetooth, but this is not covered here.
>
> The LPO clock is fed from CLK_OUT_A, which needs to be muxed on pin
> PI12. This can be represented in multiple ways. This patch puts the
> pinctrl property in the pin controller node. This is due to limitations
> in Linux, where pinmux settings, even the same one, can not be shared
> by multiple devices. Thus we cannot put it in both the WiFi and
> Bluetooth device nodes. Putting it the CCU node is another option, but
> Linux's CCU driver does not handle pinctrl. Also the pin controller is
> guaranteed to be initialized after the CCU, when clocks are available.
> And any other devices that use muxed pins are guaranteed to be
> initialized after the pin controller. Thus having the CLK_OUT_A pinmux
> reference be in the pin controller node is a good choice without having
> to deal with implementation issues.
>
> Signed-off-by: Pablo Greco <pgreco@centosproject.org>
> ---
> arch/arm/boot/dts/sun8i-v40-bananapi-m2-berry.dts | 22 ++++++++++++++++++++++
> 1 file changed, 22 insertions(+)
>
> diff --git a/arch/arm/boot/dts/sun8i-v40-bananapi-m2-berry.dts b/arch/arm/boot/dts/sun8i-v40-bananapi-m2-berry.dts
> index c87f2c0..15c22b0 100644
> --- a/arch/arm/boot/dts/sun8i-v40-bananapi-m2-berry.dts
> +++ b/arch/arm/boot/dts/sun8i-v40-bananapi-m2-berry.dts
> @@ -96,6 +96,8 @@
> wifi_pwrseq: wifi_pwrseq {
> compatible = "mmc-pwrseq-simple";
> reset-gpios = <&pio 6 10 GPIO_ACTIVE_LOW>; /* PG10 WIFI_EN */
> + clocks = <&ccu CLK_OUTA>;
> + clock-names = "ext_clock";

So if you don't have that patch (that enables bluetooth) the wifi
doesn't work (even though the previous patch is supposed to enable it)
?

> };
> };
>
> @@ -173,6 +175,7 @@
>
> &pio {
> pinctrl-names = "default";
> + pinctrl-0 = <&clk_out_a_pin>;

This one should bein the previous one as well

Maxime

--
Maxime Ripard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com
[unhandled content-type:application/pgp-signature]
\
 
 \ /
  Last update: 2019-05-02 09:42    [W:0.066 / U:0.172 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site