8f9e91ad03
These patches were generated from: https://github.com/raspberrypi/linux/commits/rpi-6.12.y With the following command: git format-patch -N v6.12.27..HEAD (HEAD -> 8d3206ee456a5ecdf9ddbfd8e5e231e4f0cd716e) Exceptions: - (def)configs patches - github workflows patches - applied & reverted patches - readme patches - wireless patches Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
37 lines
1.4 KiB
Diff
37 lines
1.4 KiB
Diff
From 672715d5c4d5da3b77ea8b0c31961052ee355c33 Mon Sep 17 00:00:00 2001
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From: Richard Oliver <richard.oliver@raspberrypi.com>
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Date: Tue, 25 Feb 2025 15:27:59 +0000
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Subject: [PATCH] spi: rp2040-gpio-bridge: probe: Cfg fast_xfer clk
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Fast transfer mode requires that the first bit of data is clocked with a
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rising edge. This can cause extra bits of data to be clocked on hardware
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where the clock signal uses a pull-up. This change ensures that clk is
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driven low before fast data transfer mode is entered.
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Signed-off-by: Richard Oliver <richard.oliver@raspberrypi.com>
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---
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drivers/spi/spi-rp2040-gpio-bridge.c | 6 +++++-
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1 file changed, 5 insertions(+), 1 deletion(-)
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--- a/drivers/spi/spi-rp2040-gpio-bridge.c
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+++ b/drivers/spi/spi-rp2040-gpio-bridge.c
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@@ -617,7 +617,6 @@ static int rp2040_gbdg_fast_xfer(struct
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&clock_mux);
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gpiod_direction_output(priv_data->fast_xfer_gpios->desc[0], 1);
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- gpiod_direction_output(priv_data->fast_xfer_gpios->desc[1], 0);
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rp2040_gbdg_rp1_calc_offsets(priv_data->fast_xfer_data_index,
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&data_bank, &data_offset);
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@@ -989,6 +988,11 @@ static void rp2040_gbdg_parse_dt(struct
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goto node_put;
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}
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+ /*
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+ * fast_xfer mode requires first data bit to be clocked on a rising
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+ * edge. Configure as output-low here before fast_xfer mode is entered.
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+ */
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+ gpiod_direction_output(rp2040_gbdg->fast_xfer_gpios->desc[1], 0);
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node_put:
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if (of_args[0].np)
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of_node_put(of_args[0].np);
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