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3272dd9b0f
When the mdio-gpio driver is probed via device trees, the platform device id is set as -1, However the pdev->id is re-used as bus-id for while creating mdio gpio bus. So For device tree case the mdio-gpio bus name appears as "gpio-ffffffff" where as for non-device tree case the bus name appears as "gpio-<bus-num>" Which means the bus_id is fixed in device tree case, so we can't have two mdio gpio buses via device trees. Assigning a logical bus number via device tree solves the problem and the bus name is much consistent with non-device tree bus name. Without this patch 1. we can't support two mdio-gpio buses via device trees. 2. we should always pass gpio-ffffffff as bus name to phy_connect, very different to non-device tree bus name. So, setting up the bus_id via aliases from device tree is the right solution and other drivers do similar thing. Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@st.com> Signed-off-by: David S. Miller <davem@davemloft.net>
27 lines
485 B
Plaintext
27 lines
485 B
Plaintext
MDIO on GPIOs
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Currently defined compatibles:
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- virtual,gpio-mdio
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MDC and MDIO lines connected to GPIO controllers are listed in the
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gpios property as described in section VIII.1 in the following order:
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MDC, MDIO.
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Note: Each gpio-mdio bus should have an alias correctly numbered in "aliases"
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node.
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Example:
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aliases {
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mdio-gpio0 = <&mdio0>;
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};
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mdio0: mdio {
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compatible = "virtual,mdio-gpio";
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#address-cells = <1>;
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#size-cells = <0>;
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gpios = <&qe_pio_a 11
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&qe_pio_c 6>;
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};
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