@@ -94,6 +94,30 @@ void ahci_platform_disable_phys(struct ahci_host_priv *hpriv)
}
EXPORT_SYMBOL_GPL(ahci_platform_disable_phys);
+/**
+ * ahci_platform_find_clk - Find platform clock
+ * @hpriv: host private area to store config values
+ * @con_id: clock connection ID
+ *
+ * This function returns a pointer to the clock descriptor of the clock with
+ * the passed ID.
+ *
+ * RETURNS:
+ * Pointer to the clock descriptor on success otherwise NULL
+ */
+struct clk *ahci_platform_find_clk(struct ahci_host_priv *hpriv, const char *con_id)
+{
+ int i;
+
+ for (i = 0; i < hpriv->n_clks; i++) {
+ if (!strcmp(hpriv->clks[i].id, con_id))
+ return hpriv->clks[i].clk;
+ }
+
+ return NULL;
+}
+EXPORT_SYMBOL_GPL(ahci_platform_find_clk);
+
/**
* ahci_platform_enable_clks - Enable platform clocks
* @hpriv: host private area to store config values
@@ -13,6 +13,7 @@
#include <linux/compiler.h>
+struct clk;
struct device;
struct ata_port_info;
struct ahci_host_priv;
@@ -21,6 +22,8 @@ struct scsi_host_template;
int ahci_platform_enable_phys(struct ahci_host_priv *hpriv);
void ahci_platform_disable_phys(struct ahci_host_priv *hpriv);
+struct clk *ahci_platform_find_clk(struct ahci_host_priv *hpriv,
+ const char *con_id);
int ahci_platform_enable_clks(struct ahci_host_priv *hpriv);
void ahci_platform_disable_clks(struct ahci_host_priv *hpriv);
int ahci_platform_deassert_rsts(struct ahci_host_priv *hpriv);
Since all the clocks are retrieved by the method ahci_platform_get_resources() there is no need for the LLD (glue) drivers to be looking for some particular of them in the kernel clocks table again. Instead we suggest to add a simple method returning a device-specific clock with passed connection ID if it is managed to be found. Otherwise the function will return NULL. Thus the glue-drivers won't need to either manually touching the hpriv->clks array or calling clk_get()-friends. The AHCI platform drivers will be able to use the new function right after the ahci_platform_get_resources() method invocation and up to the device removal. Note the method is left unused here, but will be utilized in the framework of the DWC AHCI SATA driver being added in the next commit. Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru> --- Changelog v2: - Fix some grammar mistakes in the method description. Changelog v4: - Add a note regarding the new method usage. Changelog v5: - Fix the ahci_platform_find_clk() declaration identations. (@Damien) - Simplify the ahci_platform_find_clk() method body by dropping the local poiter to clk structure. (@Damien) --- drivers/ata/libahci_platform.c | 24 ++++++++++++++++++++++++ include/linux/ahci_platform.h | 3 +++ 2 files changed, 27 insertions(+)