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52 lines
1.9 KiB
Diff
52 lines
1.9 KiB
Diff
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From 76de914223ec09274a7857e0d8cd7b739205dc3c Mon Sep 17 00:00:00 2001
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From: Gregory CLEMENT <gregory.clement@free-electrons.com>
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Date: Fri, 21 Jun 2013 15:32:06 +0200
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Subject: [PATCH 035/203] i2c: mv64xxx: Set bus frequency to 100kHz if
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clock-frequency is not provided
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This commit adds checking whether clock-frequency property acquisition
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has succeeded. If not, the frequency is set to 100kHz by default.
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The Device Tree binding documentation is updated accordingly.
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Based on the intials patches from Zbigniew Bodek
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Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
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Signed-off-by: Zbigniew Bodek <zbb@semihalf.com>
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Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
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---
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Documentation/devicetree/bindings/i2c/i2c-mv64xxx.txt | 6 +++++-
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drivers/i2c/busses/i2c-mv64xxx.c | 6 +++++-
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2 files changed, 10 insertions(+), 2 deletions(-)
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--- a/Documentation/devicetree/bindings/i2c/i2c-mv64xxx.txt
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+++ b/Documentation/devicetree/bindings/i2c/i2c-mv64xxx.txt
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@@ -6,7 +6,11 @@ Required properties :
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- reg : Offset and length of the register set for the device
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- compatible : Should be "marvell,mv64xxx-i2c"
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- interrupts : The interrupt number
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- - clock-frequency : Desired I2C bus clock frequency in Hz.
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+
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+Optional properties :
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+
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+ - clock-frequency : Desired I2C bus clock frequency in Hz. If not set the
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+default frequency is 100kHz
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Examples:
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--- a/drivers/i2c/busses/i2c-mv64xxx.c
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+++ b/drivers/i2c/busses/i2c-mv64xxx.c
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@@ -580,7 +580,11 @@ mv64xxx_of_config(struct mv64xxx_i2c_dat
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goto out;
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}
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tclk = clk_get_rate(drv_data->clk);
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- of_property_read_u32(np, "clock-frequency", &bus_freq);
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+
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+ rc = of_property_read_u32(np, "clock-frequency", &bus_freq);
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+ if (rc)
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+ bus_freq = 100000; /* 100kHz by default */
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+
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if (!mv64xxx_find_baud_factors(bus_freq, tclk,
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&drv_data->freq_n, &drv_data->freq_m)) {
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rc = -EINVAL;
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