[lkml]   [2019]   [Apr]   [16]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
Subject[PATCH 0/5] mtk-sd enhancement to support MT7621
The MT7621 MIPS-based SOC contains an sdhci unit that is
much the same as the units supported by mtk-sd.c.

These patches enhance the driver so that I can use it on my MT7621
board (

Some thoughts:
- I wonder if voltage-ranges should be a standard option, processed
by mmc_of_parse(), rather than requiring mmc_of_parse_voltage()
to be called as well?

- the "compatible" name "ralink,mt7620-sdhci" doesn't fit the pattern
of other names. It is a name I found in openwrt - I was previously
using a driver from there. I have no objection to changing it,
but I have no way to determine what the "correct" name it.

- I have tested the card-detect logic but not the write-protect, as
that doesn't seem to be wired on this board.

- My SOC doesn't have software-controlled clocks (that I can find).
To get the clocks that the driver requires, I define a "fixed-clock"
with the appropriate frequency and use that for both "source" and
"hclk". Many these clocks should be optional - at least hclk ??

- I don't need to reconfigure the pins for "uhs" so I just use the
same pinctrl setting for "default" and for "state_uhs". Maybe
"state_uhs" should be optional?

For reference, excerpts from my dts file are below.


mmc_clock: mmc_clock@0 {
#clock-cells = <0>;
compatible = "fixed-clock";
clock-frequency = <48000000>;


sdhci: sdhci@1E130000 {
status = "disabled";

compatible = "ralink,mt7620-sdhci";
reg = <0x1E130000 0x4000>;

bus-width = <4>;
max-frequency = <48000000>;
voltage-ranges = <2800 3300>;

pinctrl-names = "default", "state_uhs";
pinctrl-0 = <&sdhci_pins>;
pinctrl-1 = <&sdhci_pins>;
clocks = <&mmc_clock &mmc_clock>;
clock-names = "source", "hclk";

interrupt-parent = <&gic>;


NeilBrown (5):
mmc: mtk-sd: support "voltage-ranges" setting.
mmc: mtk-sd: don't hard-code interrupt trigger type
mmc: mtk-sd: add support for config found in mt7620 family SOCs.
mmc: mtk-sd: enable internal card-detect logic.
mmc: mtk-sd: enable internal write-protect logic.

Documentation/devicetree/bindings/mmc/mtk-sd.txt | 7 +
drivers/mmc/host/mtk-sd.c | 105 +++++++++++++++++++++-
2 files changed, 104 insertions(+), 8 deletions(-)


 \ /
  Last update: 2019-04-16 06:48    [W:0.075 / U:0.204 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site