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linux-bl808/drivers/net/dsa
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Marek Vasut 1c45ba93d3 net: dsa: microchip: Adjust reset release timing to match reference reset circuit 
KSZ8794CNX datasheet section 8.0 RESET CIRCUIT describes recommended
circuit for interfacing with CPU/FPGA reset consisting of 10k pullup
resistor and 10uF capacitor to ground. This circuit takes ~100 ms to
rise enough to release the reset.

For maximum supply voltage VDDIO=3.3V VIH=2.0V R=10kR C=10uF that is
                    VDDIO - VIH
  t = R * C * -ln( ------------- ) = 10000*0.00001*-(-0.93)=0.093 s
                       VDDIO
so we need ~95 ms for the reset to really de-assert, and then the
original 100us for the switch itself to come out of reset. Simply
msleep() for 100 ms which fits the constraint with a bit of extra
space.

Fixes: 5b79798090 ("net: dsa: microchip: Implement recommended reset timing")
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Michael Grzeschik <m.grzeschik@pengutronix.de>
Reviewed-by: Paul Barker <pbarker@konsulko.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://lore.kernel.org/r/20210120030502.617185-1-marex@denx.de
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2021-01-20 20:52:28 -08:00
..
b53 net: dsa: b53: fix an off by one in checking "vlan->vid" 2021-01-19 19:34:49 -08:00
hirschmann net: dsa: fix led_classdev build errors 2021-01-06 16:17:14 -08:00
microchip net: dsa: microchip: Adjust reset release timing to match reference reset circuit 2021-01-20 20:52:28 -08:00
mv88e6xxx net: dsa: mv88e6xxx: also read STU state in mv88e6250_g1_vtu_getnext 2021-01-18 13:04:28 -08:00
ocelot
qca
sja1105
bcm_sf2.c
bcm_sf2.h
bcm_sf2_cfp.c
bcm_sf2_regs.h
dsa_loop.c
dsa_loop.h
dsa_loop_bdinfo.c
Kconfig
lan9303-core.c
lan9303.h
lan9303_i2c.c
lan9303_mdio.c
lantiq_gswip.c net: dsa: lantiq_gswip: Exclude RMII from modes that report 1 GbE 2021-01-07 19:00:11 -08:00
lantiq_pce.h
Makefile
mt7530.c
mt7530.h
mv88e6060.c
mv88e6060.h
qca8k.c
qca8k.h
realtek-smi-core.c
realtek-smi-core.h
rtl8366.c
rtl8366rb.c
vitesse-vsc73xx-core.c
vitesse-vsc73xx-platform.c
vitesse-vsc73xx-spi.c
vitesse-vsc73xx.h