Messages in this thread | | | Date | Wed, 20 May 2015 16:43:11 -0700 | From | Stephen Boyd <> | Subject | Re: [PATCH 2/4] clk: add support for clocks provided by SCP(System Control Processor) |
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On 04/27, Sudeep Holla wrote: > diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig > index 9897f353bf1a..906bf7dd72a2 100644 > --- a/drivers/clk/Kconfig > +++ b/drivers/clk/Kconfig > @@ -59,6 +59,16 @@ config COMMON_CLK_RK808 > clocked at 32KHz each. Clkout1 is always on, Clkout2 can off > by control register. > > +config COMMON_CLK_SCPI > + tristate "Clock driver controlled via SCPI interface" > + depends on ARM_SCPI_PROTOCOL
|| COMPILE_TEST ?
> + ---help--- > + This driver provides support for clocks that are controlled > + by firmware that implements the SCPI interface. > + > + This driver uses SCPI Message Protocol to interact with the > + firware providing all the clock controls. > + > config COMMON_CLK_SI5351 > tristate "Clock driver for SiLabs 5351A/B/C" > depends on I2C > diff --git a/drivers/clk/clk-scpi.c b/drivers/clk/clk-scpi.c > new file mode 100644 > index 000000000000..70a2d57da32d > --- /dev/null > +++ b/drivers/clk/clk-scpi.c > @@ -0,0 +1,344 @@ > +#include <linux/clkdev.h>
Is clkdev used here?
> +#include <linux/clk-provider.h> > +#include <linux/device.h> > +#include <linux/err.h> > +#include <linux/of.h> > +#include <linux/module.h> > +#include <linux/of_platform.h> > +#include <linux/scpi_protocol.h> > + [...] > + > +static int scpi_dvfs_set_rate(struct clk_hw *hw, unsigned long rate, > + unsigned long parent_rate) > +{ > + struct scpi_clk *clk = to_scpi_clk(hw); > + int ret = __scpi_find_dvfs_index(clk, rate); > + > + if (ret < 0) > + return ret; > + return scpi_ops->dvfs_set_idx(clk->id, (u8)ret); > +} > + > +static struct clk_ops scpi_dvfs_ops = {
const?
> + .recalc_rate = scpi_dvfs_recalc_rate, > + .round_rate = scpi_dvfs_round_rate, > + .set_rate = scpi_dvfs_set_rate, > +}; > + > +static struct clk * > +scpi_dvfs_ops_init(struct device *dev, struct device_node *np, > + struct scpi_clk *sclk) > +{ > + struct clk_init_data init; > + struct scpi_dvfs_info *info; > + > + init.name = sclk->name; > + init.flags = CLK_IS_ROOT; > + init.num_parents = 0; > + init.ops = &scpi_dvfs_ops; > + sclk->hw.init = &init; > + > + info = scpi_ops->dvfs_get_info(sclk->id); > + if (IS_ERR(info)) > + return (struct clk *)info;
return ERR_CAST(info)?
> + > + sclk->info = info; > + > + return devm_clk_register(dev, &sclk->hw); > +} > + > + [...] > +static int scpi_clk_probe(struct platform_device *pdev) > +{ > + struct clk **clks; > + int idx, count; > + struct clk_onecell_data *clk_data; > + struct device *dev = &pdev->dev; > + struct device_node *np = dev->of_node; > + struct clk *(*clk_ops_init)(struct device *, struct device_node *, > + struct scpi_clk *); > + > + if (!of_device_is_available(np)) > + return -ENODEV;
Is this because of_platform_populate() populates disabled nodes?
> + > + clk_ops_init = of_match_node(scpi_clk_match, np)->data; > + if (!clk_ops_init) > + return -ENODEV; > + > + count = of_property_count_strings(np, "clock-output-names"); > + if (count < 0) { > + dev_err(dev, "%s: invalid clock output count\n", np->name); > + return -EINVAL; > + } > + > + clk_data = devm_kmalloc(dev, sizeof(*clk_data), GFP_KERNEL); > + if (!clk_data) { > + dev_err(dev, "failed to allocate clock provider data\n"); > + return -ENOMEM; > + } > + > + clks = devm_kmalloc(dev, count * sizeof(*clks), GFP_KERNEL);
devm_kcalloc()?
> + if (!clks) { > + dev_err(dev, "failed to allocate clock providers\n");
Error messages on allocation failures are useless. Please remove.
> + return -ENOMEM; > + } > + > + for (idx = 0; idx < count; idx++) { > + struct scpi_clk *sclk; [...] > +static int scpi_clk_remove(struct platform_device *pdev) > +{ > + of_clk_del_provider(pdev->dev.of_node); > + platform_set_drvdata(pdev, NULL);
We don't need to set platform_drvdata to NULL here.
> + return 0; > +} > +
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