[PATCH 3/5] arm/dt: mx51: dynamically add gpt and uart related clocks per dt nodes
Grant Likely
grant.likely at secretlab.ca
Tue Mar 15 18:37:31 EST 2011
On Tue, Mar 08, 2011 at 12:22:10AM +0800, Shawn Guo wrote:
> This patch is to change the static clock creating and registering to
> the dynamic way, which scans dt clock nodes, associate clk with
> device_node, and then add them to clkdev accordingly.
>
> Signed-off-by: Shawn Guo <shawn.guo at linaro.org>
> ---
> arch/arm/mach-mx5/clock-mx51-mx53.c | 436 +++++++++++++++++++++++++++++++++--
> 1 files changed, 422 insertions(+), 14 deletions(-)
>
> diff --git a/arch/arm/mach-mx5/clock-mx51-mx53.c b/arch/arm/mach-mx5/clock-mx51-mx53.c
> index dedb7f9..1940171 100644
> --- a/arch/arm/mach-mx5/clock-mx51-mx53.c
> +++ b/arch/arm/mach-mx5/clock-mx51-mx53.c
> @@ -135,6 +135,9 @@ static inline u32 _get_mux(struct clk *parent, struct clk *m0,
>
> static inline void __iomem *_mx51_get_pll_base(struct clk *pll)
> {
> +#ifdef CONFIG_OF
> + return pll->pll_base;
> +#else
> if (pll == &pll1_main_clk)
> return MX51_DPLL1_BASE;
> else if (pll == &pll2_sw_clk)
> @@ -145,6 +148,7 @@ static inline void __iomem *_mx51_get_pll_base(struct clk *pll)
> BUG();
>
> return NULL;
> +#endif
> }
>
> static inline void __iomem *_mx53_get_pll_base(struct clk *pll)
> @@ -1439,33 +1443,437 @@ int __init mx53_clocks_init(unsigned long ckil, unsigned long osc,
> return 0;
> }
>
> +/*
> + * Dynamically create and register clks per dt nodes
> + */
> #ifdef CONFIG_OF
> -static struct clk *mx5_dt_clk_get(struct device_node *np,
> - const char *output_id, void *data)
> +
> +#define ALLOC_CLK_LOOKUP() \
> + struct clk_lookup *cl; \
> + struct clk *clk; \
> + int ret; \
> + \
> + do { \
> + cl = kzalloc(sizeof(*cl) + sizeof(*clk), GFP_KERNEL); \
> + if (!cl) \
> + return -ENOMEM; \
> + clk = (struct clk *) (cl + 1); \
> + \
> + clk->parent = mx5_get_source_clk(node); \
> + clk->secondary = mx5_get_source_clk(node); \
> + } while (0)
> +
> +#define ADD_CLK_LOOKUP() \
> + do { \
> + node->data = clk; \
> + cl->dev_id = of_get_property(node, \
> + "clock-outputs", NULL); \
> + cl->con_id = of_get_property(node, \
> + "clock-alias", NULL); \
> + if (!cl->dev_id && !cl->con_id) { \
> + ret = -EINVAL; \
> + goto out_kfree; \
> + } \
> + cl->clk = clk; \
> + clkdev_add(cl); \
> + \
> + return 0; \
> + \
> + out_kfree: \
> + kfree(cl); \
> + return ret; \
> + } while (0)
Yikes! Doing this as a macro will be a nightmare for debugging.
This needs refactoring into functions.
> +
> +static unsigned long get_fixed_clk_rate(struct clk *clk)
> {
> - return data;
> + return clk->rate;
> }
>
> -static __init void mx5_dt_scan_clks(void)
> +static __init int mx5_scan_fixed_clks(void)
> {
> struct device_node *node;
> + struct clk_lookup *cl;
> struct clk *clk;
> - const char *id;
> - int rc;
> + const __be32 *rate;
> + int ret = 0;
>
> - for_each_compatible_node(node, NULL, "clock") {
> - id = of_get_property(node, "clock-outputs", NULL);
> - if (!id)
> + for_each_compatible_node(node, NULL, "fixed-clock") {
> + cl = kzalloc(sizeof(*cl) + sizeof(*clk), GFP_KERNEL);
> + if (!cl) {
> + ret = -ENOMEM;
> + break;
> + }
> + clk = (struct clk *) (cl + 1);
> +
> + rate = of_get_property(node, "clock-frequency", NULL);
> + if (!rate) {
> + kfree(cl);
> continue;
> + }
> + clk->rate = be32_to_cpu(*rate);
> + clk->get_rate = get_fixed_clk_rate;
> +
> + node->data = clk;
>
> - clk = clk_get_sys(id, NULL);
> - if (IS_ERR(clk))
> + cl->dev_id = of_get_property(node, "clock-outputs", NULL);
> + cl->con_id = of_get_property(node, "clock-alias", NULL);
As discussed briefly earlier, clock-alias looks like it is encoding
Linux-specific implementation details into the device tree, and it
shouldn't be necessary when explicit links to clock providers are
supplied in the device tree.
> + if (!cl->dev_id && !cl->con_id) {
> + kfree(cl);
> continue;
> + }
> + cl->clk = clk;
> + clkdev_add(cl);
> + }
> +
> + return ret;
> +}
> +
> +static struct clk *mx5_prop_name_to_clk(struct device_node *node,
> + const char *prop_name)
> +{
> + struct device_node *provnode;
> + struct clk *clk;
> + const void *prop;
> + u32 provhandle;
> +
> + prop = of_get_property(node, prop_name, NULL);
> + if (!prop)
> + return NULL;
> + provhandle = be32_to_cpup(prop);
> +
> + provnode = of_find_node_by_phandle(provhandle);
> + if (!provnode)
> + return NULL;
> +
> + clk = provnode->data;
> +
> + of_node_put(provnode);
> +
> + return clk;
> +}
> +
> +static inline struct clk *mx5_get_source_clk(struct device_node *node)
> +{
> + return mx5_prop_name_to_clk(node, "clock-source");
> +}
> +
> +static inline struct clk *mx5_get_depend_clk(struct device_node *node)
> +{
> + return mx5_prop_name_to_clk(node, "clock-depend");
> +}
Ditto here. 'clock-depend' seems to be Linux specifc. I need to look
at the usage model for these properties.
>
> - rc = of_clk_add_provider(node, mx5_dt_clk_get, clk);
> - if (rc)
> - pr_err("error adding fixed clk %s\n", node->name);
> +static __init int mx5_add_uart_clk(struct device_node *node)
> +{
> + const __be32 *reg;
> + int id;
> +
> + ALLOC_CLK_LOOKUP();
> +
> + reg = of_get_property(node, "reg", NULL);
> + if (!reg) {
> + ret = -ENOENT;
> + goto out_kfree;
> + }
> +
> + id = be32_to_cpu(*reg);
> + if (id < 0 || id > 2) {
> + ret = -EINVAL;
> + goto out_kfree;
> + }
> +
> + clk->id = id;
> + clk->parent = mx5_get_source_clk(node);
> + clk->secondary = mx5_get_depend_clk(node);
> + clk->enable = _clk_ccgr_enable;
> + clk->disable = _clk_ccgr_disable;
> + clk->enable_reg = MXC_CCM_CCGR1;
> +
> + switch (id) {
> + case 0:
> + clk->enable_shift = MXC_CCM_CCGRx_CG4_OFFSET;
> + break;
> + case 1:
> + clk->enable_shift = MXC_CCM_CCGRx_CG6_OFFSET;
> + break;
> + case 2:
> + clk->enable_shift = MXC_CCM_CCGRx_CG8_OFFSET;
> + }
> +
> + ADD_CLK_LOOKUP();
> +}
> +
> +static __init int mx5_add_uart_root_clk(struct device_node *node)
> +{
> + ALLOC_CLK_LOOKUP();
> +
> + clk->get_rate = clk_uart_get_rate;
> + clk->set_parent = clk_uart_set_parent;
> +
> + ADD_CLK_LOOKUP();
> +}
> +
> +static __init int mx5_add_uart_ipg_clk(struct device_node *node)
> +{
> + const __be32 *reg;
> + int id;
> +
> + ALLOC_CLK_LOOKUP();
> +
> + reg = of_get_property(node, "reg", NULL);
> + if (!reg) {
> + ret = -ENOENT;
> + goto out_kfree;
> }
> +
> + id = be32_to_cpu(*reg);
> + if (id < 0 || id > 2) {
> + ret = -EINVAL;
> + goto out_kfree;
> + }
> +
> + clk->id = id;
> + clk->enable_reg = MXC_CCM_CCGR1;
> + clk->enable = _clk_ccgr_enable;
> + clk->disable = _clk_ccgr_disable;
> +
> + switch (id) {
> + case 0:
> + clk->enable_shift = MXC_CCM_CCGRx_CG3_OFFSET;
> + break;
> + case 1:
> + clk->enable_shift = MXC_CCM_CCGRx_CG5_OFFSET;
> + break;
> + case 2:
> + clk->enable_shift = MXC_CCM_CCGRx_CG7_OFFSET;
> + }
> +
> + ADD_CLK_LOOKUP();
> +}
> +
> +static __init int mx5_add_gpt_clk(struct device_node *node)
> +{
> + ALLOC_CLK_LOOKUP();
> +
> + clk->enable_reg = MXC_CCM_CCGR2;
> + clk->enable_shift = MXC_CCM_CCGRx_CG9_OFFSET;
> + clk->enable = _clk_ccgr_enable;
> + clk->disable = _clk_ccgr_disable;
> +
> + ADD_CLK_LOOKUP();
> +}
> +
> +static __init int mx5_add_gpt_ipg_clk(struct device_node *node)
> +{
> + ALLOC_CLK_LOOKUP();
> +
> + clk->enable_reg = MXC_CCM_CCGR2;
> + clk->enable_shift = MXC_CCM_CCGRx_CG10_OFFSET;
> + clk->enable = _clk_ccgr_enable;
> + clk->disable = _clk_ccgr_disable;
> +
> + ADD_CLK_LOOKUP();
> +}
> +
> +static __init int mx5_add_aips_tz_clk(struct device_node *node)
> +{
> + const __be32 *reg;
> + int id;
> +
> + ALLOC_CLK_LOOKUP();
> +
> + reg = of_get_property(node, "reg", NULL);
> + if (!reg) {
> + ret = -ENOENT;
> + goto out_kfree;
> + }
> +
> + id = be32_to_cpu(*reg);
> + if (id < 0 || id > 1) {
> + ret = -EINVAL;
> + goto out_kfree;
> + }
> +
> + clk->id = id;
> + clk->enable_reg = MXC_CCM_CCGR0;
> + clk->enable_shift = id ? MXC_CCM_CCGRx_CG12_OFFSET :
> + MXC_CCM_CCGRx_CG13_OFFSET;
> + clk->enable = _clk_ccgr_enable;
> + clk->disable = _clk_ccgr_disable_inwait;
> +
> + ADD_CLK_LOOKUP();
> +}
> +
> +static __init int mx5_add_ahb_max_clk(struct device_node *node)
> +{
> + ALLOC_CLK_LOOKUP();
> +
> + clk->enable_reg = MXC_CCM_CCGR0;
> + clk->enable_shift = MXC_CCM_CCGRx_CG14_OFFSET;
> + clk->enable = _clk_max_enable;
> + clk->disable = _clk_max_disable;
> +
> + ADD_CLK_LOOKUP();
> +}
> +
> +static __init int mx5_add_spba_clk(struct device_node *node)
> +{
> + ALLOC_CLK_LOOKUP();
> +
> + clk->enable_reg = MXC_CCM_CCGR5;
> + clk->enable_shift = MXC_CCM_CCGRx_CG0_OFFSET;
> + clk->enable = _clk_ccgr_enable;
> + clk->disable = _clk_ccgr_disable;
> +
> + ADD_CLK_LOOKUP();
> +}
> +
> +static __init int mx5_add_ipg_clk(struct device_node *node)
> +{
> + ALLOC_CLK_LOOKUP();
> +
> + clk->get_rate = clk_ipg_get_rate;
> +
> + ADD_CLK_LOOKUP();
> +}
> +
> +static __init int mx5_add_ahb_clk(struct device_node *node)
> +{
> + ALLOC_CLK_LOOKUP();
> +
> + clk->get_rate = clk_ahb_get_rate;
> + clk->set_rate = _clk_ahb_set_rate;
> + clk->round_rate = _clk_ahb_round_rate;
> +
> + ADD_CLK_LOOKUP();
> +}
> +
> +static __init int mx5_add_main_bus_clk(struct device_node *node)
> +{
> + ALLOC_CLK_LOOKUP();
> +
> + clk->set_parent = _clk_main_bus_set_parent;
> +
> + ADD_CLK_LOOKUP();
> +}
> +
> +static __init int mx5_add_lp_apm_clk(struct device_node *node)
> +{
> + ALLOC_CLK_LOOKUP();
> +
> + clk->set_parent = _clk_lp_apm_set_parent;
> +
> + ADD_CLK_LOOKUP();
> +}
> +
> +static __init int mx5_add_pll_switch_clk(struct device_node *node)
> +{
> + const __be32 *reg;
> + int id;
> +
> + ALLOC_CLK_LOOKUP();
> +
> + reg = of_get_property(node, "reg", NULL);
> + if (!reg) {
> + ret = -ENOENT;
> + goto out_kfree;
> + }
> +
> + id = be32_to_cpu(*reg);
> + if (id < 0 || id > 2) {
> + ret = -EINVAL;
> + goto out_kfree;
> + }
> +
> + clk->id = id;
> +
> + switch (id) {
> + case 0:
> + clk->get_rate = clk_pll1_sw_get_rate;
> + clk->set_parent = _clk_pll1_sw_set_parent;
> + break;
> + case 1:
> + clk->get_rate = clk_pll_get_rate;
> + clk->set_rate = _clk_pll_set_rate;
> + clk->enable = _clk_pll_enable;
> + clk->disable = _clk_pll_disable;
> + clk->set_parent = _clk_pll2_sw_set_parent;
> + clk->pll_base = MX51_DPLL2_BASE;
> + break;
> + case 2:
> + clk->get_rate = clk_pll_get_rate;
> + clk->set_rate = _clk_pll_set_rate;
> + clk->enable = _clk_pll_enable;
> + clk->disable = _clk_pll_disable;
> + clk->pll_base = MX51_DPLL3_BASE;
> + }
> +
> + ADD_CLK_LOOKUP();
> +}
> +
> +static __init int mx5_add_pll1_main_clk(struct device_node *node)
> +{
> + ALLOC_CLK_LOOKUP();
> +
> + clk->get_rate = clk_pll_get_rate;
> + clk->enable = _clk_pll_enable;
> + clk->disable = _clk_pll_disable;
> + clk->pll_base = MX51_DPLL1_BASE;
> +
> + ADD_CLK_LOOKUP();
> +}
> +
> +static __init int mx5_dt_scan_clks(void)
> +{
> + struct device_node *node;
> + int ret;
> +
> + ret = mx5_scan_fixed_clks();
> + if (ret) {
> + pr_err("%s: fixed-clock failed %d\n", __func__, ret);
> + return ret;
> + }
> +
> + for_each_compatible_node(node, NULL, "clock") {
> + if (!strcmp(node->name, "pll1_main"))
> + ret = mx5_add_pll1_main_clk(node);
> + else if (!strcmp(node->name, "pll_switch"))
> + ret = mx5_add_pll_switch_clk(node);
> + else if (!strcmp(node->name, "lp_apm"))
> + ret = mx5_add_lp_apm_clk(node);
> + else if (!strcmp(node->name, "main_bus"))
> + ret = mx5_add_main_bus_clk(node);
> + else if (!strcmp(node->name, "ahb"))
> + ret = mx5_add_ahb_clk(node);
> + else if (!strcmp(node->name, "ipg"))
> + ret = mx5_add_ipg_clk(node);
> + else if (!strcmp(node->name, "spba"))
> + ret = mx5_add_spba_clk(node);
> + else if (!strcmp(node->name, "ahb_max"))
> + ret = mx5_add_ahb_max_clk(node);
> + else if (!strcmp(node->name, "aips_tz"))
> + ret = mx5_add_aips_tz_clk(node);
> + else if (!strcmp(node->name, "gpt_ipg"))
> + ret = mx5_add_gpt_ipg_clk(node);
> + else if (!strcmp(node->name, "gpt"))
> + ret = mx5_add_gpt_clk(node);
> + else if (!strcmp(node->name, "uart_ipg"))
> + ret = mx5_add_uart_ipg_clk(node);
> + else if (!strcmp(node->name, "uart_root"))
> + ret = mx5_add_uart_root_clk(node);
> + else if (!strcmp(node->name, "uart"))
> + ret = mx5_add_uart_clk(node);
You can simplify this whole table is you take advantage of the .data
field in struct of_device_id, and use for_each_matching_node() to
search for relevant nodes.
> + else
> + pr_warn("%s: unknown clock node %s\n",
> + __func__, node->name);
> +
> + if (ret) {
> + pr_err("%s: clock %s failed %d\n",
> + __func__, node->name, ret);
> + break;
> + }
> + }
> +
> + return ret;
> }
>
> void __init mx5_clk_dt_init(void)
> --
> 1.7.1
>
>
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