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- From: Vittorio Gambaletta <openwrt@vittgam.net>
- Date: Fri, 01 Jan 2016 00:00:02 +0100
- Subject: [PATCH 3/3] net: mediatek: Get rt3050 ethernet ports to be disabled from the device tree.
- This patch allows configuring ports to be disabled in the device tree; this
- saves power, since disabling ports here actually disables power to ethernet
- PHYs.
- Line 444 enables all ethernet ports, so line 487 is getting zero ports to be
- disabled, except for port 5 in SoCs where this is not implemented as it will
- be sticky disabled in register POC0. Because of this, the code will still read
- the switch configuration and OR it to the device tree setting.
- Signed-off-by: Vittorio Gambaletta <openwrt@vittgam.net>
- ---
- --- a/drivers/net/ethernet/mediatek/esw_rt3050.c
- +++ b/drivers/net/ethernet/mediatek/esw_rt3050.c
- @@ -10,6 +10,7 @@
- * Copyright (C) 2009-2015 John Crispin <blogic@openwrt.org>
- * Copyright (C) 2009-2015 Felix Fietkau <nbd@nbd.name>
- * Copyright (C) 2013-2015 Michael Lee <igvtee@gmail.com>
- + * Copyright (C) 2016 Vittorio Gambaletta <openwrt@vittgam.net>
- */
-
- #include <linux/module.h>
- @@ -219,6 +220,7 @@ struct rt305x_esw {
- spinlock_t reg_rw_lock;
-
- unsigned char port_map;
- + unsigned char port_disable;
- unsigned int reg_led_polarity;
-
- struct switch_dev swdev;
- @@ -483,8 +485,14 @@ static void esw_hw_init(struct rt305x_es
- esw_w32(esw, 0x00000005, RT305X_ESW_REG_P3LED);
- esw_w32(esw, 0x00000005, RT305X_ESW_REG_P4LED);
-
- - /* Copy disabled port configuration from bootloader setup */
- - port_disable = esw_get_port_disable(esw);
- + /* Copy disabled port configuration from device tree setup */
- + port_disable = esw->port_disable;
- +
- + /* Disable nonexistent ports by reading the switch config
- + * after having enabled all possible ports above
- + */
- + port_disable |= esw_get_port_disable(esw);
- +
- for (i = 0; i < 6; i++)
- esw->ports[i].disable = (port_disable & (1 << i)) != 0;
-
- @@ -1330,7 +1338,7 @@ static int esw_probe(struct platform_dev
- {
- struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- struct device_node *np = pdev->dev.of_node;
- - const __be32 *port_map, *reg_init;
- + const __be32 *port_map, *port_disable, *reg_init;
- struct switch_dev *swdev;
- struct rt305x_esw *esw;
- int ret;
- @@ -1349,6 +1357,10 @@ static int esw_probe(struct platform_dev
- if (port_map)
- esw->port_map = be32_to_cpu(*port_map);
-
- + port_disable = of_get_property(np, "mediatek,portdisable", NULL);
- + if (port_disable)
- + esw->port_disable = be32_to_cpu(*port_disable);
- +
- reg_init = of_get_property(np, "mediatek,led_polarity", NULL);
- if (reg_init)
- esw->reg_led_polarity = be32_to_cpu(*reg_init);
- --- a/Documentation/devicetree/bindings/net/ralink,rt3050-esw.txt
- +++ b/Documentation/devicetree/bindings/net/ralink,rt3050-esw.txt
- @@ -16,6 +16,7 @@ Required properties:
- Optional properties:
- - mediatek,portmap: can be used to choose if the default switch setup is
- llllw or wllll
- +- mediatek,portdisable: disable unused ethernet PHYs to save power
- - mediatek,led_polarity: override the active high/low settings of the leds
-
- Example:
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