target/linux/brcm2708/patches-4.4/0162-clk-bcm2835-Add-a-driver-for-the-auxiliary-periphera.patch

   1 From 924276b92ff47f0e778a9405d00637be4ca88736 Mon Sep 17 00:00:00 2001
   2 From: Eric Anholt <eric@anholt.net>
   3 Date: Tue, 15 Dec 2015 15:35:58 -0800
   4 Subject: [PATCH 162/170] clk: bcm2835: Add a driver for the auxiliary
   5  peripheral clock gates.
   6
   7 There are a pair of SPI masters and a mini UART that were last minute
   8 additions.  As a result, they didn't get integrated in the same way as
   9 the other gates off of the VPU clock in CPRMAN.
  10
  11 Signed-off-by: Eric Anholt <eric@anholt.net>
  12 Signed-off-by: Michael Turquette <mturquette@baylibre.com>
  13
  14 updated Makefile to preserve the rasoberry pi architectures
  15 ---
  16  drivers/clk/bcm/Makefile          |  1 +
  17  drivers/clk/bcm/clk-bcm2835-aux.c | 85 +++++++++++++++++++++++++++++++++++++++
  18  2 files changed, 86 insertions(+)
  19  create mode 100644 drivers/clk/bcm/clk-bcm2835-aux.c
  20
  21 --- a/drivers/clk/bcm/Makefile
  22 +++ b/drivers/clk/bcm/Makefile
  23 @@ -4,6 +4,7 @@ obj-$(CONFIG_CLK_BCM_KONA)      += clk-bcm281
  24  obj-$(CONFIG_CLK_BCM_KONA)     += clk-bcm21664.o
  25  obj-$(CONFIG_COMMON_CLK_IPROC) += clk-iproc-armpll.o clk-iproc-pll.o clk-iproc-asiu.o
  26  obj-$(CONFIG_ARCH_BCM2835)$(CONFIG_ARCH_BCM2708)$(CONFIG_ARCH_BCM2709) += clk-bcm2835.o
  27 +obj-$(CONFIG_ARCH_BCM2835)     += clk-bcm2835-aux.o
  28  obj-$(CONFIG_COMMON_CLK_IPROC) += clk-ns2.o
  29  obj-$(CONFIG_ARCH_BCM_CYGNUS)  += clk-cygnus.o
  30  obj-$(CONFIG_ARCH_BCM_NSP)     += clk-nsp.o
  31 --- /dev/null
  32 +++ b/drivers/clk/bcm/clk-bcm2835-aux.c
  33 @@ -0,0 +1,85 @@
  34 +/*
  35 + * Copyright (C) 2015 Broadcom
  36 + *
  37 + * This program is free software; you can redistribute it and/or modify
  38 + * it under the terms of the GNU General Public License as published by
  39 + * the Free Software Foundation; either version 2 of the License, or
  40 + * (at your option) any later version.
  41 + *
  42 + * This program is distributed in the hope that it will be useful,
  43 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
  44 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  45 + * GNU General Public License for more details.
  46 + */
  47 +
  48 +#include <linux/clk.h>
  49 +#include <linux/clk-provider.h>
  50 +#include <linux/clk/bcm2835.h>
  51 +#include <linux/module.h>
  52 +#include <linux/platform_device.h>
  53 +#include <dt-bindings/clock/bcm2835-aux.h>
  54 +
  55 +#define BCM2835_AUXIRQ         0x00
  56 +#define BCM2835_AUXENB         0x04
  57 +
  58 +static int bcm2835_aux_clk_probe(struct platform_device *pdev)
  59 +{
  60 +       struct device *dev = &pdev->dev;
  61 +       struct clk_onecell_data *onecell;
  62 +       const char *parent;
  63 +       struct clk *parent_clk;
  64 +       struct resource *res;
  65 +       void __iomem *reg, *gate;
  66 +
  67 +       parent_clk = devm_clk_get(dev, NULL);
  68 +       if (IS_ERR(parent_clk))
  69 +               return PTR_ERR(parent_clk);
  70 +       parent = __clk_get_name(parent_clk);
  71 +
  72 +       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  73 +       reg = devm_ioremap_resource(dev, res);
  74 +       if (!reg)
  75 +               return -ENODEV;
  76 +
  77 +       onecell = devm_kmalloc(dev, sizeof(*onecell), GFP_KERNEL);
  78 +       if (!onecell)
  79 +               return -ENOMEM;
  80 +       onecell->clk_num = BCM2835_AUX_CLOCK_COUNT;
  81 +       onecell->clks = devm_kcalloc(dev, BCM2835_AUX_CLOCK_COUNT,
  82 +                                    sizeof(*onecell->clks), GFP_KERNEL);
  83 +       if (!onecell->clks)
  84 +               return -ENOMEM;
  85 +
  86 +       gate = reg + BCM2835_AUXENB;
  87 +       onecell->clks[BCM2835_AUX_CLOCK_UART] =
  88 +               clk_register_gate(dev, "aux_uart", parent, 0, gate, 0, 0, NULL);
  89 +
  90 +       onecell->clks[BCM2835_AUX_CLOCK_SPI1] =
  91 +               clk_register_gate(dev, "aux_spi1", parent, 0, gate, 1, 0, NULL);
  92 +
  93 +       onecell->clks[BCM2835_AUX_CLOCK_SPI2] =
  94 +               clk_register_gate(dev, "aux_spi2", parent, 0, gate, 2, 0, NULL);
  95 +
  96 +       of_clk_add_provider(pdev->dev.of_node, of_clk_src_onecell_get, onecell);
  97 +
  98 +       return 0;
  99 +}
 100 +
 101 +static const struct of_device_id bcm2835_aux_clk_of_match[] = {
 102 +       { .compatible = "brcm,bcm2835-aux", },
 103 +       {},
 104 +};
 105 +MODULE_DEVICE_TABLE(of, bcm2835_aux_clk_of_match);
 106 +
 107 +static struct platform_driver bcm2835_aux_clk_driver = {
 108 +       .driver = {
 109 +               .name = "bcm2835-aux-clk",
 110 +               .of_match_table = bcm2835_aux_clk_of_match,
 111 +       },
 112 +       .probe          = bcm2835_aux_clk_probe,
 113 +};
 114 +builtin_platform_driver(bcm2835_aux_clk_driver);
 115 +
 116 +MODULE_AUTHOR("Eric Anholt <eric@anholt.net>");
 117 +MODULE_DESCRIPTION("BCM2835 auxiliary peripheral clock driver");
 118 +MODULE_LICENSE("GPL v2");