[PATCH v2 2/3] clk: bcm2835: Add a driver for the auxiliary peripheral clock gates.

[Michael Turquette]

On Tue, Dec 15, 2015 at 3:35 PM, Eric Anholt <eric at anholt.net> wrote:
> There are a pair of SPI masters and a mini UART that were last minute
> additions.  As a result, they didn't get integrated in the same way as
> the other gates off of the VPU clock in CPRMAN.
>
> Signed-off-by: Eric Anholt <eric at anholt.net>

Applied to clk-next.

Regards,
Mike

> ---
>
> v2: Make the binding cover both the IRQ and clock enable registers.
>     Use devm_ allocation, ioremap, and and clock get functions.  Don't
>     return the error from of_clk_add_provider(), since that would
>     leave the clocks registered, but their registers unmapped.  Trim
>     includes.
>
>  drivers/clk/bcm/Makefile          |  1 +
>  drivers/clk/bcm/clk-bcm2835-aux.c | 85 +++++++++++++++++++++++++++++++++++++++
>  2 files changed, 86 insertions(+)
>  create mode 100644 drivers/clk/bcm/clk-bcm2835-aux.c
>
> diff --git a/drivers/clk/bcm/Makefile b/drivers/clk/bcm/Makefile
> index 3fc9506..183484c 100644
> --- a/drivers/clk/bcm/Makefile
> +++ b/drivers/clk/bcm/Makefile
> @@ -4,6 +4,7 @@ obj-$(CONFIG_CLK_BCM_KONA)      += clk-bcm281xx.o
>  obj-$(CONFIG_CLK_BCM_KONA)     += clk-bcm21664.o
>  obj-$(CONFIG_COMMON_CLK_IPROC) += clk-iproc-armpll.o clk-iproc-pll.o clk-iproc-asiu.o
>  obj-$(CONFIG_ARCH_BCM2835)     += clk-bcm2835.o
> +obj-$(CONFIG_ARCH_BCM2835)     += clk-bcm2835-aux.o
>  obj-$(CONFIG_COMMON_CLK_IPROC) += clk-ns2.o
>  obj-$(CONFIG_ARCH_BCM_CYGNUS)  += clk-cygnus.o
>  obj-$(CONFIG_ARCH_BCM_NSP)     += clk-nsp.o
> diff --git a/drivers/clk/bcm/clk-bcm2835-aux.c b/drivers/clk/bcm/clk-bcm2835-aux.c
> new file mode 100644
> index 0000000..e4f89e2
> --- /dev/null
> +++ b/drivers/clk/bcm/clk-bcm2835-aux.c
> @@ -0,0 +1,85 @@
> +/*
> + * Copyright (C) 2015 Broadcom
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/clk-provider.h>
> +#include <linux/clk/bcm2835.h>
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +#include <dt-bindings/clock/bcm2835-aux.h>
> +
> +#define BCM2835_AUXIRQ         0x00
> +#define BCM2835_AUXENB         0x04
> +
> +static int bcm2835_aux_clk_probe(struct platform_device *pdev)
> +{
> +       struct device *dev = &pdev->dev;
> +       struct clk_onecell_data *onecell;
> +       const char *parent;
> +       struct clk *parent_clk;
> +       struct resource *res;
> +       void __iomem *reg, *gate;
> +
> +       parent_clk = devm_clk_get(dev, NULL);
> +       if (IS_ERR(parent_clk))
> +               return PTR_ERR(parent_clk);
> +       parent = __clk_get_name(parent_clk);
> +
> +       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +       reg = devm_ioremap_resource(dev, res);
> +       if (!reg)
> +               return -ENODEV;
> +
> +       onecell = devm_kmalloc(dev, sizeof(*onecell), GFP_KERNEL);
> +       if (!onecell)
> +               return -ENOMEM;
> +       onecell->clk_num = BCM2835_AUX_CLOCK_COUNT;
> +       onecell->clks = devm_kcalloc(dev, BCM2835_AUX_CLOCK_COUNT,
> +                                    sizeof(*onecell->clks), GFP_KERNEL);
> +       if (!onecell->clks)
> +               return -ENOMEM;
> +
> +       gate = reg + BCM2835_AUXENB;
> +       onecell->clks[BCM2835_AUX_CLOCK_UART] =
> +               clk_register_gate(dev, "aux_uart", parent, 0, gate, 0, 0, NULL);
> +
> +       onecell->clks[BCM2835_AUX_CLOCK_SPI1] =
> +               clk_register_gate(dev, "aux_spi1", parent, 0, gate, 1, 0, NULL);
> +
> +       onecell->clks[BCM2835_AUX_CLOCK_SPI2] =
> +               clk_register_gate(dev, "aux_spi2", parent, 0, gate, 2, 0, NULL);
> +
> +       of_clk_add_provider(pdev->dev.of_node, of_clk_src_onecell_get, onecell);
> +
> +       return 0;
> +}
> +
> +static const struct of_device_id bcm2835_aux_clk_of_match[] = {
> +       { .compatible = "brcm,bcm2835-aux", },
> +       {},
> +};
> +MODULE_DEVICE_TABLE(of, bcm2835_aux_clk_of_match);
> +
> +static struct platform_driver bcm2835_aux_clk_driver = {
> +       .driver = {
> +               .name = "bcm2835-aux-clk",
> +               .of_match_table = bcm2835_aux_clk_of_match,
> +       },
> +       .probe          = bcm2835_aux_clk_probe,
> +};
> +builtin_platform_driver(bcm2835_aux_clk_driver);
> +
> +MODULE_AUTHOR("Eric Anholt <eric at anholt.net>");
> +MODULE_DESCRIPTION("BCM2835 auxiliary peripheral clock driver");
> +MODULE_LICENSE("GPL v2");
> --
> 2.6.2
>



-- 
Michael Turquette
CEO
BayLibre - At the Heart of Embedded Linux
http://baylibre.com/