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net: stmmac: add documentation for stmmac_dma_cfg members

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Add documentation of each of the struct stmmac_dma_cfg members. dche
remains undocumented as I don't have documentation that covers this.

Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Tested-by: Mohd Ayaan Anwar <mohd.anwar@oss.qualcomm.com>
Link: https://patch.msgid.link/E1vzX5U-0000000CVsQ-162V@rmk-PC.armlinux.org.uk
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Russell King (Oracle) 2026-03-09 09:39:44 +00:00 committed by Jakub Kicinski
parent 758ed85aad
commit 9fe167ab79
1 changed files with 23 additions and 2 deletions
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25
include/linux/stmmac.h
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@ -93,16 +93,37 @@ struct stmmac_mdio_bus_data {
};
struct stmmac_dma_cfg {
/* pbl: programmable burst limit
* txpbl: transmit programmable burst limit
* rxpbl: receive programmable burst limit
* If txpbl or rxpbl are zero, the value of pbl will be substituted.
* Range 0 - 63.
*/
int pbl;
int txpbl;
int rxpbl;
/* pblx8: multiplies pbl, txpbl, rxpbl by a factor of 8 for dwmac >=
* 3.50a, or a factor of 4 for previous versions.
*/
bool pblx8;
/* fixed_burst:
* when set, AXI bursts defined by axi_blen_regval are permitted.
* AHB uses SINGLE, INCR4, INCR8 or INCR16 during burst transfers.
* when clear, AXI and AHB use SINGLE or INCR bursts.
*/
bool fixed_burst;
/* mixed_burst:
* when set and fixed_burst is clear, AHB uses INCR for bursts > 16
* and SINGLE or INCRx for bursts <= 16.
*/
bool mixed_burst;
/* aal: address aligned bursts for AHB and AXI master interface */
bool aal;
bool eame;
bool multi_msi_en;
bool dche;
bool eame;
/* multi_msi_en: stmmac core internal */
bool multi_msi_en;
/* atds: stmmac core internal */
bool atds;
};